Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and relates to the field of batteries. The battery cell includes a housing having a first wall portion provided with a plurality of mounting holes, a first electrode terminal, and a plurality of electrode assemblies. The plurality of electrode assemblies are accommodated in the housing, each electrode assembly comprises a first tab, and the plurality of electrode assemblies comprise a first electrode assembly and a second electrode assembly. The first electrode terminal comprises a body part and a plurality of connecting parts, the body part is arranged on the side, away from the electrode assembly, of the first wall part, the body part is provided with a first surface facing the electrode assembly, the connecting parts protrude out of the first surface, and each connecting part is arranged in one mounting hole in a penetrating mode. The first tab of the first electrode assembly is directly connected with one connecting part, and the first tab of the second electrode assembly is directly connected with the other connecting part. According to the battery monomer, a current collecting component is omitted, so that the internal space of the battery monomer occupied by the current collecting component is reduced, and the energy density of the battery monomer is improved.

Description

Technical Field

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

[0002] Batteries are widely used in the new energy field, such as in electric vehicles and new energy vehicles, which have become a new trend in the automotive industry. The development of battery technology must consider multiple design factors simultaneously, such as battery life, discharge capacity, and charge / discharge rate. Additionally, battery energy density also needs to be considered. However, the energy density of current batteries is relatively low. Utility Model Content

[0003] The purpose of this application is to provide a battery cell, a battery device, and an electrical device, which aims to improve the problem of low energy density of batteries in related technologies.

[0004] In a first aspect, embodiments of this application provide a battery cell, the battery cell including a housing, a first electrode terminal and a plurality of electrode assemblies, the housing having a first wall portion having a plurality of mounting holes; the plurality of electrode assemblies being housed within the housing, each electrode assembly including a first tab, and the plurality of electrode assemblies including a first electrode assembly and a second electrode assembly; the first electrode terminal including a body portion and a plurality of connecting portions, the body portion being disposed on the side of the first wall portion opposite to the electrode assembly, the body portion having a first surface facing the electrode assembly, the plurality of connecting portions protruding from the first surface, each connecting portion passing through a mounting hole, the first tab of the first electrode assembly being directly connected to one of the connecting portions, and the first tab of the second electrode assembly being directly connected to another connecting portion.

[0005] In the above technical solution, by directly connecting the first tab of the first electrode assembly to one connecting part and the first tab of the second electrode assembly to another connecting part, firstly, the current collector is eliminated, reducing its occupation of the internal space of the battery cell and thus improving the energy density of the battery cell. Secondly, the direct connection of the first tab of the first electrode assembly to one connecting part and the direct connection of the first tab of the second electrode assembly to another connecting part facilitates manufacturing, reduces mutual interference, and ensures high connection quality, thereby improving the reliability of the battery cell. Finally, the direct connection of the first tab of the first electrode assembly to one connecting part increases the connection area between the first tab and the first electrode terminal, and the direct connection of the first tab of the second electrode assembly to another connecting part increases the connection area between the first tab and the first electrode terminal, thus improving the current carrying capacity.

[0006] As an optional technical solution in this application embodiment, the electrode assembly includes a main body, and the first electrode tab includes a convergence area, a bending area, and a connecting area. The convergence area is connected to one end of the main body facing the first wall portion, the bending area connects the convergence area and the connecting area, the connecting area is located between the main body and the first wall portion, and the connecting area is connected to the connecting portion. In a projection plane perpendicular to the thickness direction of the first wall portion, the orthographic projection of the connecting area of ​​the first electrode assembly does not overlap with the orthographic projection of the connecting area of ​​the second electrode assembly.

[0007] In the above technical solution, the orthographic projection of the connection area of ​​the first electrode assembly in the projection plane perpendicular to the thickness direction of the first wall portion does not overlap with the orthographic projection of the connection area of ​​the second electrode assembly in the projection plane perpendicular to the thickness direction of the first wall portion. In this way, the space occupied in the thickness direction of the first wall portion can be reduced, thereby improving the energy density of the battery cell.

[0008] As an optional technical solution in this application embodiment, a plurality of electrode assemblies are arranged along a first direction, and along the first direction, the bending areas of the first electrode assembly and the bending areas of the second electrode assembly are respectively located on both sides of the connecting portion.

[0009] In the above technical solution, by positioning the bending areas of the first electrode assembly and the second electrode assembly on opposite sides of the connecting portion along the first direction, on the one hand, the positions of the first electrode assembly and the second electrode assembly at the first tabs can be approximately the same. This allows the electrodes of the first and second electrode assemblies to be manufactured using the same process, without significantly altering existing manufacturing processes, thus reducing the manufacturing cost of the battery cell. On the other hand, by positioning the bending areas of the first and second electrode assemblies on opposite sides of the connecting portion along the first direction, the positions of the first tabs of the first and second electrode assemblies can be made closer. This reduces the risk of interference between the first tabs and other components and also reduces the space occupied within the battery cell, thereby improving the energy density of the battery cell.

[0010] As an optional technical solution in this application embodiment, a plurality of the connecting portions are arranged along a second direction, which is perpendicular to the first direction; the connecting area includes a first portion and a second portion, the first portion connecting the bending area and the second portion, and the second portion connecting to the connecting portion; along the second direction, the width of the first portion is greater than the width of the second portion; along the first direction, in the first electrode assembly and the second electrode assembly, the first portion of one is spaced apart from the second portion of the other; along the second direction, the second portion of the first electrode assembly and the second portion of the second electrode assembly are spaced apart.

[0011] In the above technical solution, by making the width of the first part greater than the width of the second part, on the one hand, the first part and the second part can jointly form a clearance area. The clearance area of ​​the first electrode assembly can avoid the second part of the second electrode assembly, and the clearance area of ​​the second electrode assembly can avoid the second part of the first electrode assembly. This ensures that the orthographic projection of the connection area of ​​the first electrode assembly in the projection plane perpendicular to the thickness direction of the first wall portion does not overlap with the orthographic projection of the connection area of ​​the second electrode assembly in the projection plane perpendicular to the thickness direction of the first wall portion. On the other hand, the fact that the width of the first part is greater than the width of the second part improves the current carrying capacity compared to technical solutions where the width of the first part is less than or equal to the width of the second part.

[0012] As an optional technical solution in this application embodiment, along the second direction, the maximum width of the first part is A, and the width of the second part is B, satisfying: 0.1A≤B≤0.5A.

[0013] In the above technical solution, when B ≥ 0.1A, the width of the second part along the second direction is relatively large, which facilitates the connection between the second part and the connecting part and increases the connection area between the second part and the connecting part, thereby improving the current carrying capacity. When B ≤ 0.5A, the width of the second part along the second direction is not too large, so the second part of the first electrode assembly is less likely to interfere with the second part of the second electrode assembly, which is beneficial to improving the reliability of the battery cell. Therefore, when 0.1A ≤ B ≤ 0.5A, both the current carrying capacity and reliability of the battery cell can be balanced.

[0014] As an optional technical solution in this application embodiment, 0.2A≤B≤0.5A.

[0015] In the above technical solution, when B ≥ 0.2A, the width of the second part along the second direction is larger, making it easier for the second part to connect with the connecting part and increasing the connection area between the second part and the connecting part, thereby improving the current carrying capacity. When B ≤ 0.5A, the width of the second part along the second direction is not too large, so the second part of the first electrode assembly is less likely to interfere with the second part of the second electrode assembly, which is beneficial to improving the reliability of the battery cell. Therefore, when 0.2A ≤ B ≤ 0.5A, it is better to balance the current carrying capacity and reliability of the battery cell.

[0016] As an optional technical solution in this application embodiment, along the second direction, the maximum width of the first part is A, and the maximum dimension of the first wall part is C, satisfying: 0.125C≤A≤0.455C.

[0017] In the above technical solution, when A ≥ 0.125C, the width of the first part along the second direction is relatively large, which is beneficial to improving the current carrying capacity. When A ≤ 0.455C, the width of the first part along the second direction is not too large, which helps to reduce the risk of interference between the first part and other components and improve the reliability of the battery cell. Therefore, when 0.125C ≤ A ≤ 0.455C, both the current carrying capacity and reliability of the battery cell can be balanced.

[0018] As an optional technical solution in this application embodiment, 0.167C≤A≤0.25C.

[0019] In the above technical solution, when A ≥ 0.167C, the width of the first part along the second direction is larger, which is more conducive to improving the current carrying capacity. When A ≤ 0.25C, the width of the first part along the second direction is not too large, which helps to reduce the risk of interference between the first part and other components and improve the reliability of the battery cell. Therefore, when 0.167C ≤ A ≤ 0.25C, it is better to balance the current carrying capacity and reliability of the battery cell.

[0020] As an optional technical solution in this application embodiment, in the projection plane perpendicular to the thickness direction of the first wall portion, the orthographic projection of the connecting portion is completely located within the orthographic projection of the connecting area connected to the connecting portion.

[0021] In the above technical solution, by making the orthographic projection of the connecting part in the projection plane perpendicular to the thickness direction of the first wall completely located within the orthographic projection of the connecting area connected to the connecting part in the projection plane perpendicular to the thickness direction of the first wall, the connection area between the connecting area and the connecting part is larger, which is beneficial to improving the flow capacity.

[0022] As an optional technical solution in this application embodiment, the projection of the first wall portion along its thickness direction is rectangular, and the plurality of connecting portions are spaced apart along the length direction of the first wall portion.

[0023] In the above technical solution, the first wall can be a cuboid structure. By arranging multiple connecting parts at intervals along the length of the first wall, the space in the length of the first wall can be fully utilized. This facilitates welding with the first tab and allows the first electrode terminal to be larger, thereby improving the current carrying capacity of the battery cell.

[0024] As an optional technical solution in this application embodiment, the dimension of the body portion along the length direction of the first wall portion is greater than the dimension of the body portion along the width direction of the first wall portion.

[0025] In the above technical solution, the dimension of the body part along the length direction of the first wall part is greater than the dimension of the body part along the width direction of the first wall part. At this time, the body part is a strip structure extending along the length direction of the first wall part, which can make full use of the space in the length direction of the first wall part, making the first electrode terminal larger, thereby improving the current carrying capacity of the battery cell.

[0026] As an optional technical solution in an embodiment of this application, the plurality of electrode components include a third electrode component, wherein the first tab of the third electrode component is stacked with the first tab of the first electrode component and is connected to a connection portion; and / or the plurality of electrode components include a fourth electrode component, wherein the first tab of the fourth electrode component is stacked with the first tab of the second electrode component and is connected to another connection portion.

[0027] In the above technical solution, the first tab of the third electrode assembly is stacked with the first tab of the first electrode assembly and connected to a common connecting part. On the one hand, this facilitates the electrical connection between the first tab of the third electrode assembly and the first electrode terminal, and the connection area between the first tab and the first electrode terminal of the third electrode assembly is large, providing strong current-carrying capacity. On the other hand, it helps reduce the number of connecting parts, reduces the space occupied by the first electrode terminal in the battery cell, and reduces the risk of interference between the first electrode terminal and other components. Similarly, the first tab of the fourth electrode assembly is stacked with the first tab of the second electrode assembly and connected to another connecting part. On the one hand, this facilitates the electrical connection between the first tab of the fourth electrode assembly and the first electrode terminal, and the connection area between the first tab and the first electrode terminal of the fourth electrode assembly is large, providing strong current-carrying capacity. On the other hand, it helps reduce the number of connecting parts, reduces the space occupied by the first electrode terminal in the battery cell, and reduces the risk of interference between the first electrode terminal and other components.

[0028] As an optional technical solution in this application embodiment, the first electrode tab and the connecting part are welded together.

[0029] In the above technical solution, by welding the first electrode tab and the connecting part together, on the one hand, the welding process is relatively simple, which helps to reduce manufacturing costs. On the other hand, the connection between the first electrode tab and the connecting part has high strength, making the connection between the first electrode tab and the first electrode terminal less prone to failure, which helps to improve the reliability of the battery cell.

[0030] As an optional technical solution in this application embodiment, the battery cell further includes a plurality of sealing elements, each of which is provided in a one-to-one correspondence with the connecting portion, and the sealing elements are used to seal the connecting portion and the first wall portion.

[0031] In the above technical solution, by setting a sealing element to seal the connection part and the first wall part, the risk of electrolyte in the battery cell flowing out of the battery cell from the gap between the connection part and the first wall part can be reduced, and the risk of external impurities entering the battery cell can be reduced, which is beneficial to improving the reliability of the battery cell.

[0032] As an optional technical solution in this application embodiment, a portion of the seal is disposed between the outer peripheral surface of the connecting portion and the wall surface of the mounting hole, and another portion of the seal is disposed between the body portion and the first wall portion.

[0033] In the above technical solution, by placing a portion of the seal between the outer peripheral surface of the connector and the wall surface of the mounting hole, the gap between the outer peripheral surface of the connector and the wall surface of the mounting hole is sealed. By placing another portion of the seal between the body and the first wall, the gap between the body and the first wall is sealed. In this way, the seal can seal two locations, thereby further reducing the risk of electrolyte in the battery cell flowing out of the battery cell from the gap between the connector and the first wall, and further reducing the risk of external impurities entering the battery cell, which is beneficial to improving the reliability of the battery cell.

[0034] As an optional technical solution in this application embodiment, the connecting part is cylindrical, and the sealing member is arranged in a ring structure around the connecting part.

[0035] In the above technical solution, the connecting part is cylindrical, and the sealing element is a ring structure surrounding the connecting part. The ring structure of the sealing ring has more uniform force, higher stability, and better sealing effect. It can not only reduce the risk of electrolyte flowing out of the battery cell, but also reduce the risk of external impurities entering the battery cell, which is conducive to improving the reliability of the battery cell.

[0036] As an optional technical solution in this application embodiment, the battery cell includes an insulating component and a connector. The insulating component connects the connector and the body portion and insulates and isolates the connector and the body portion. The connector is located on the side of the first wall portion away from the electrode assembly and is connected to the first wall portion.

[0037] In the above technical solution, the connector can fix the insulating component and the first electrode terminal to the first wall portion, which can easily and conveniently realize the installation of the first electrode terminal and reduce manufacturing costs. Furthermore, the insulating component can insulate and isolate the connector and the first electrode terminal, reducing the risk of a short circuit caused by the first electrode terminal forming an electrical connection with the first wall portion through the connector.

[0038] As an optional technical solution in this application embodiment, the battery cell includes a positive electrode terminal and a negative electrode terminal, and the electrode assembly includes a positive tab and a negative tab. The positive tab is connected to the positive electrode terminal, and the negative tab is connected to the negative electrode terminal. At least one of the positive electrode terminal and the negative electrode terminal is the first electrode terminal, and at least one of the positive tab and the negative tab is the first tab.

[0039] In the above technical solution, when the positive tab is the first tab, the corresponding positive electrode terminal is the first electrode terminal. When the negative tab is the first tab, the corresponding negative electrode terminal is the first electrode terminal. When both the positive and negative tabs are first tabs, the corresponding positive and negative electrode terminals are both first electrode terminals, and the positive tab is connected to the positive electrode terminal, and the negative tab is connected to the negative electrode terminal. This improves the energy density, reliability, and overcurrent capability of the battery cell.

[0040] As an optional technical solution in this application embodiment, the outer shell includes a housing and an end cap, the housing has an opening, the end cap closes the opening, and the end cap is the first wall portion.

[0041] In the above technical solution, when the end cover is the first wall portion, the first electrode terminal is disposed on the end cover, which is simple and convenient to manufacture.

[0042] Secondly, embodiments of this application also provide a battery device, which includes the aforementioned battery cell.

[0043] Thirdly, embodiments of this application also provide an electrical device, which includes the aforementioned battery cell, and the battery cell is used to provide electrical energy to the electrical device. Attached Figure Description

[0044] 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.

[0045] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0046] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0047] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0048] Figure 4 Exploded views of a single battery cell provided in some embodiments of this application;

[0049] Figure 5 Exploded views of the first electrode terminal and the first wall portion provided for some embodiments of this application;

[0050] Figure 6 A schematic diagram of the structure of the first electrode terminal provided in some embodiments of this application from a first viewpoint;

[0051] Figure 7 A schematic diagram of the structure of the first electrode terminal provided in some embodiments of this application from a second perspective;

[0052] Figure 8 A top view schematic diagram of a battery cell provided in some embodiments of this application;

[0053] Figure 9 for Figure 8 A cross-sectional view at position AA in the middle;

[0054] Figure 10 This is a schematic diagram of the structure of a first electrode tab connected to a first electrode terminal, provided in some embodiments of this application;

[0055] Figure 11 for Figure 8 A cross-sectional view at position BB in the middle.

[0056] Icons: 10-Box body; 11-First box body; 12-Second box body; 20-Battery cell; 21-Outer shell; 211-Housing shell; 212-End cap; 213-First wall; 2131-Mounting hole; 22-Electrode assembly; 22a-First electrode assembly; 22b-Second electrode assembly; 221-Main body; 222-First tab; 2221-Collapsing area; 2222-Bending area; 2223-Connection area; 22231-First part; 22232-Second part; 223-Soldering part; 23-First electrode terminal; 231-Main body; 2311-First surface; 232-Connection part; 24-Seal; 25-Lower plastic; 26-Insulator; 27-Connector; 100-Battery assembly; 200-Controller; 300-Motor; 1000-Vehicle. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] 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 accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0059] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0060] 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.

[0061] 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.

[0062] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0063] In this application, "multiple" means two or more (including two).

[0064] 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.

[0065] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0066] 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, reduces the risk of short circuits while allowing active ions to pass through.

[0067] 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.

[0068] 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.

[0069] 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 aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors 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.).

[0070] 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 in battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05At least one of O2 and its modified compounds.

[0071] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0072] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0073] As an example, the negative electrode current collector can be a metal foil, a foamed metal, 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 electrodes, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper 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.).

[0074] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0075] As an example, 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.

[0076] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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 in battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0077] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0078] In some embodiments, the separator is a separator membrane. The separator membrane can be any known porous structure separator membrane with good chemical and mechanical stability.

[0079] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0080] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0081] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0082] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0083] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0084] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0085] In some implementations, the electrode assembly is a stacked structure.

[0086] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0087] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0088] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0089] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0090] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0091] In some implementations, the electrode assembly may be flat or polygonal in shape.

[0092] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] 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, or a composite metal (such as a copper-aluminum composite housing).

[0094] 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 can protect the electrode assembly and prevent, to some extent, electrolyte leakage. When the housing is a non-sealed structure, it can still protect 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 component or an aluminum-plastic film.

[0095] As an example, a battery cell can be 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 battery cells, such as hexagonal prismatic battery cells.

[0096] The battery apparatus 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.

[0097] 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 multiple battery cells and fixing them together to form an independent module.

[0098] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0099] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cells housed within the housing.

[0100] 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.

[0101] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0102] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0103] 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.

[0104] 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.

[0105] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0106] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0107] Batteries are widely used in the new energy field, such as in electric vehicles and new energy vehicles, which have become a new trend in the automotive industry. The development of battery technology must consider multiple design factors simultaneously, such as battery life, discharge capacity, and charge / discharge rate. Additionally, battery energy density also needs to be considered. However, the energy density of current batteries is relatively low.

[0108] In the prior art, a battery cell includes electrode terminals, electrode assemblies, and current collectors. The electrode terminals are disposed on the outer casing of the battery cell, and the electrode assemblies are electrically connected to the electrode terminals through the current collectors, enabling the electrode terminals to output electrical energy to or input electrical energy to the electrode assemblies. However, the current collectors occupy the internal space of the battery cell, resulting in a lower energy density of the battery cell.

[0109] Therefore, this application provides a battery cell, which includes a housing, a first electrode terminal, and multiple electrode assemblies. The housing has a first wall portion with multiple mounting holes. Multiple electrode assemblies are housed within the housing, each electrode assembly including a first tab and a second electrode assembly. The first electrode terminal includes a body portion and multiple connecting portions. The body portion is located on the side of the first wall portion opposite to the electrode assembly and has a first surface facing the electrode assembly. The multiple connecting portions protrude from the first surface, each connecting portion passing through a mounting hole. The first tab of the first electrode assembly is directly connected to one connecting portion, and the first tab of the second electrode assembly is directly connected to another connecting portion.

[0110] By directly connecting the first tab of the first electrode assembly to one connecting part and the first tab of the second electrode assembly to another connecting part, firstly, the current collector is eliminated, reducing its footprint within the battery cell and thus improving the energy density of the battery cell. Secondly, direct connection of the first tab of the first electrode assembly to one connecting part and the first tab of the second electrode assembly to another connecting part facilitates manufacturing, minimizes mutual interference, and ensures higher connection quality, thereby improving the reliability of the battery cell. Finally, direct connection of the first tab of the first electrode assembly to one connecting part increases the connection area between the first tab and the first electrode terminal, and direct connection of the first tab of the second electrode assembly to another connecting part increases the connection area between the first tab and the first electrode terminal, thus improving current carrying capacity.

[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] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0113] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may 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.

[0114] 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.

[0115] 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.

[0116] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a housing 10 and battery cells 20, the housing 10 being used to house the battery cells 20.

[0117] The housing 10 has an enclosed space inside for accommodating the battery cells 20. The housing 10 can have various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which are interlocked. The first housing body 11 and the second housing body 12 can have various shapes, such as cuboids or cylinders. The first housing body 11 can be a hollow structure open on one side, and the second housing body 12 can also be a hollow structure open on one side. The open side of the second housing body 12 interlocks with the open side of the first housing body 11, thus forming a housing 10 with an enclosed space. Alternatively, the first housing body 11 can be a hollow structure open on one side, and the second housing body 12 can be a plate-like structure, with the second housing body 12 interlocked with the open side of the first housing body 11, thus forming a housing 10 with an accommodating space.

[0118] In the battery device 100, there can be one or more battery cells 20. If there are multiple battery cells 20, they 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. Alternatively, multiple battery cells 20 can be first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10. Another option is that all battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the whole consisting of all battery cells 20 is housed within the housing 10.

[0119] In some embodiments, the battery device 100 may further include a busbar component, through which multiple battery cells 20 can be electrically connected to each other to achieve series, parallel, or mixed connection of the multiple battery cells 20. The busbar component may be a metallic conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0120] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. Figure 4 An exploded view of a battery cell 20 provided in some embodiments of this application. Figure 5 Exploded view of the first electrode terminal 23 and the first wall portion 213 provided for some embodiments of this application. Figure 6 This is a schematic diagram of the structure of the first electrode terminal 23 provided in some embodiments of this application from a first perspective. Figure 7 This is a schematic diagram of the structure of the first electrode terminal 23 provided in some embodiments of this application from a second perspective. Figure 8 This is a top view schematic diagram of a battery cell 20 provided in some embodiments of this application. Figure 9 for Figure 8A cross-sectional view at position AA. This application provides a battery cell 20, which includes a housing 21, a first electrode terminal 23, and multiple electrode assemblies 22. The housing 21 has a first wall portion 213 with multiple mounting holes 2131. Multiple electrode assemblies 22 are housed within the housing 21. Each electrode assembly 22 includes a first tab 222, a first electrode assembly 22a, and a second electrode assembly 22b. The first electrode terminal 23 includes a body portion 231 and multiple connecting portions 232. The body portion 231 is located on the side of the first wall portion 213 facing away from the electrode assembly 22. The body portion 231 has a first surface 2311 facing the electrode assembly 22. The multiple connecting portions 232 protrude from the first surface 2311, and each connecting portion 232 passes through a mounting hole 2131. The first tab 222 of the first electrode assembly 22a is directly connected to a connecting part 232, and the first tab 222 of the second electrode assembly 22b is directly connected to another connecting part 232.

[0121] Battery cell 20 refers to the smallest unit that makes up battery device 100.

[0122] The housing 21 includes an end cap 212 and a housing 211. The housing 211 has a receiving space with an opening at one end for accommodating the electrode assembly 22. The end cap 212 is connected to the housing 211 and closes the opening.

[0123] 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, allowing battery cell 20 to have higher structural strength and improved safety performance. 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 any special limitations on this. Battery cell 20 also includes lower plastic 25, which is disposed inside end cap 212. Lower plastic 25 can be used to isolate electrical connection components inside housing 211 from end cap 212 to reduce the risk of short circuit. For example, lower plastic 25 can be plastic, rubber, etc.

[0124] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. An opening can be provided on the housing 211, and the end cap 212 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 212 and the housing 211 can be integrated. Specifically, the end cap 212 and the housing 211 can form a common mating surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 211, the end cap 212 closes the housing 211. The housing 211 can have various shapes and sizes, such as cuboid or hexagonal prism. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 211 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0125] In some embodiments, the housing 211 may have an opening at only one end, with one end cap 212 correspondingly provided. In other embodiments, the housing 211 may have openings at both ends, with two end caps 212 correspondingly provided, the two end caps 212 respectively closing the two opposite openings of the housing 211. Figure 3 and Figure 4 In the embodiment shown, the housing 211 has an opening at only one end, and an end cap 212 is provided accordingly.

[0126] Electrode assembly 22 is the component in the battery cell 20 where electrochemical reactions occur. The battery cell 20 may include two, three, four, 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. The portions of the positive and negative electrode sheets containing active material constitute the main body 221 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 main body or at opposite ends of the main body 221. During the charging and discharging process of the battery cell 20, the positive and negative active materials react with the electrolyte.

[0127] The plurality of electrode assemblies 22 include a first electrode assembly 22a and a second electrode assembly 22b, optionally, the first electrode assembly 22a and the second electrode assembly 22b are adjacent to each other.

[0128] The electrode assembly 22 has a first tab 222, which is either the positive tab or the negative tab mentioned above.

[0129] The first wall portion 213 can be an end cap 212 of the outer casing 21, or it can be a wall portion of the housing 211 of the outer casing 21. In some embodiments, in Figure 3 and Figure 4 In this embodiment, the first wall portion 213 is the end cap 212. In other embodiments, the first wall portion 213 may be the bottom wall of the housing 211 opposite to the end cap 212. In still other embodiments, the first wall portion 213 may also be a side wall of the housing 211 adjacent to and connected to the end cap 212.

[0130] The first wall portion 213 may be provided with two, three, four, or more mounting holes 2131. The mounting holes 2131 penetrate the first wall portion 213 along its thickness direction. In other words, the mounting holes 2131 are through holes provided in the first wall portion 213. Please refer to... Figure 5 The thickness direction of the first wall portion 213 can be the Z direction as shown in the figure.

[0131] The first electrode terminal 23 is used for electrical connection with the first tab 222 of the electrode assembly 22 to output or input electrical energy to the electrode assembly 22. The first electrode terminal 23 includes a body portion 231 and a plurality of connecting portions 232. The body portion 231 is the portion of the first electrode terminal 23 disposed on the side of the first wall portion 213 facing away from the electrode assembly 22, and the connecting portions 232 are the portions of the first electrode terminal 23 that pass through the mounting holes 2131. The first electrode terminal 23 may include two, three, four, or more connecting portions 232, with each connecting portion 232 corresponding to a mounting hole 2131, and the body portion 231 connecting to the plurality of connecting portions 232. The body portion 231 has a first surface 2311 facing the electrode assembly 22, and the plurality of connecting portions 232 protrude from the first surface 2311 and extend toward the electrode assembly 22.

[0132] Optionally, the main body 231 and the multiple connecting parts 232 are integrally formed.

[0133] The first tab 222 of the first electrode assembly 22a is directly connected to a connecting portion 232, for example, by welding the first tab 222 of the first electrode assembly 22a to the connecting portion 232. The first tab 222 of the second electrode assembly 22b is directly connected to another connecting portion 232, for example, by welding the first tab 222 of the second electrode assembly 22b to the other connecting portion 232. In this way, the current collector can be eliminated, and the electrical connection between the electrode assembly 22 and the first electrode terminal 23 can be directly achieved.

[0134] When the first tab 222 is a positive tab, the first electrode terminal 23 is a positive electrode terminal. The first tab 222 of the first electrode assembly 22a is directly connected to one connection portion 232 of a positive electrode terminal, and the first tab 222 of the second electrode assembly 22b is directly connected to the other connection portion 232 of the aforementioned positive electrode terminal. When the first tab 222 is a negative tab, the first electrode terminal 23 is a negative electrode terminal. The first tab 222 of the first electrode assembly 22a is directly connected to one connection portion 232 of a negative electrode terminal, and the first tab 222 of the second electrode assembly 22b is directly connected to the other connection portion 232 of the aforementioned negative electrode terminal.

[0135] By directly connecting the first tab 222 of the first electrode assembly 22a to one connection portion 232, and the first tab 222 of the second electrode assembly 22b to another connection portion 232, firstly, the current collector is eliminated, reducing its footprint on the internal space of the battery cell 20 and thus improving the energy density of the battery cell 20. Secondly, the direct connection of the first tab 222 of the first electrode assembly 22a to one connection portion 232 and the direct connection of the first tab 222 of the second electrode assembly 22b to another connection portion 232 facilitates manufacturing, minimizes mutual interference, and ensures high connection quality, thereby improving the reliability of the battery cell 20. Finally, the first tab 222 of the first electrode assembly 22a is directly connected to a single connection part 232, which helps to increase the connection area between the first tab 222 of the first electrode assembly 22a and the first electrode terminal 23. The first tab 222 of the second electrode assembly 22b is directly connected to another connection part 232, which helps to increase the connection area between the first tab 222 of the second electrode assembly 22b and the first electrode terminal 23, and helps to improve the current carrying capacity.

[0136] Please refer to Figure 10 and Figure 11 , Figure 10 This is a schematic diagram of the structure of a first tab 222 connected to a first electrode terminal 23, provided for some embodiments of this application. Figure 11 for Figure 8 A cross-sectional view at position BB. In some embodiments, the electrode assembly 22 includes a main body 221, and a first tab 222 includes a convergence area 2221, a bending area 2222, and a connecting area 2223. The convergence area 2221 is connected to the end of the main body 221 facing the first wall portion 213. The bending area 2222 connects the convergence area 2221 and the connecting area 2223. The connecting area 2223 is located between the main body 221 and the first wall portion 213 and is connected to the connecting portion 232. In a projection plane perpendicular to the thickness direction of the first wall portion 213, the orthographic projection of the connecting area 2223 of the first electrode assembly 22a does not overlap with the orthographic projection of the connecting area 2223 of the second electrode assembly 22b.

[0137] Electrode assembly 22 includes multiple first sub-electrodes with the same polarity, which are stacked and together form a first electrode tab 222.

[0138] The gathering area 2221 is the part of the first electrode tab 222 used to gather multiple first sub-electrodes. The gathering area 2221 is connected to the main body 221 and is located between the main body 221 and the first wall 213.

[0139] The connecting area 2223 is the part of the first tab 222 used to connect with the connecting part 232. Along the thickness direction of the first wall part 213, the connecting area 2223 is located between the main body part 221 and the first wall part 213. The connecting area 2223 can be spaced apart from the main body part 221.

[0140] The bending area 2222 is the part of the first tab 222 used to connect the gathering area 2221 and the connecting area 2223.

[0141] "In the projection plane perpendicular to the thickness direction of the first wall portion 213, the orthographic projection of the connection area 2223 of the first electrode assembly 22a does not overlap with the orthographic projection of the connection area 2223 of the second electrode assembly 22b." That is, the orthographic projection of the connection area 2223 of the first electrode assembly 22a in the projection plane perpendicular to the thickness direction of the first wall portion 213 does not overlap with the orthographic projection of the connection area 2223 of the second electrode assembly 22b in the projection plane perpendicular to the thickness direction of the first wall portion 213.

[0142] The orthographic projection of the connection area 2223 of the first electrode assembly 22a in the projection plane perpendicular to the thickness direction of the first wall portion 213 does not overlap with the orthographic projection of the connection area 2223 of the second electrode assembly 22b in the projection plane perpendicular to the thickness direction of the first wall portion 213. This reduces the space occupied in the thickness direction of the first wall portion 213, thereby increasing the energy density of the battery cell 20.

[0143] Please refer to Figure 10 and Figure 11 In some embodiments, multiple electrode assemblies 22 are arranged along a first direction. Along the first direction, the bending region 2222 of the first electrode assembly 22a and the bending region 2222 of the second electrode assembly 22b are located on both sides of the connecting portion 232, respectively.

[0144] For ease of display, Figure 10 The cross-section shows the position of the solder mark 223 formed by the connection of the first tab 222 and the connecting part 232.

[0145] The first direction refers to the arrangement direction of the multiple electrode components 22. Please refer to... Figure 10 and Figure 11The first direction is the X direction shown in the figure.

[0146] Along the first direction, the bending area 2222 of the first electrode assembly 22a and the bending area 2222 of the second electrode assembly 22b are at least partially opposite to each other, and the connection portion 232 of the first electrode terminal 23 is located between the bending area 2222 of the first electrode assembly 22a and the bending area 2222 of the second electrode assembly 22b.

[0147] When the tabs are bent, the bending direction of the first tab 222 of the first electrode assembly 22a is opposite to the bending direction of the first tab 222 of the second electrode assembly 22b.

[0148] By positioning the bending areas 2222 of the first electrode assembly 22a and 2222 of the second electrode assembly 22b along the first direction on both sides of the connecting portion 232, on the one hand, the positions of the first tabs 222 of the first electrode assembly 22a and the second electrode assembly 22b can be approximately the same. This allows the electrodes of the first electrode assembly 22a and the second electrode assembly 22b to be manufactured using the same process, without significantly altering existing manufacturing processes, thus reducing the manufacturing cost of the battery cell 20. On the other hand, by positioning the bending areas 2222 of the first electrode assembly 22a and 2222 of the second electrode assembly 22b along the first direction on both sides of the connecting portion 232, the positions of the first tabs 222 of the first electrode assembly 22a and the first tabs 222 of the second electrode assembly 22b can be made closer together. This reduces the risk of interference between the first tabs 222 and other components, and also reduces the space occupied by the first tabs 222 of the battery cell 20, thereby improving the energy density of the battery cell 20.

[0149] Please refer to Figure 10 and Figure 11 In some embodiments, multiple connecting portions 232 are arranged along a second direction, which is perpendicular to the first direction. The connecting region 2223 includes a first portion 22231 and a second portion 22232. The first portion 22231 connects to the bending region 2222 and the second portion 22232, and the second portion 22232 connects to the connecting portion 232. Along the second direction, the width of the first portion 22231 is greater than the width of the second portion 22232. Along the first direction, in the first electrode assembly 22a and the second electrode assembly 22b, the first portion 22231 of one is spaced apart from the second portion 22232 of the other. Along the second direction, the second portion 22232 of the first electrode assembly 22a and the second portion 22232 of the second electrode assembly 22b are spaced apart.

[0150] The second direction is the arrangement direction of the multiple connecting parts 232. Please refer to... Figure 10The second direction is the Y direction shown in the figure. The first direction, the second direction, and the thickness direction of the first wall portion 213 are all perpendicular to each other.

[0151] The second part 22232 is the portion of the connecting area 2223 used to connect with the connecting part 232. The first part 22231 is the portion of the connecting area 2223 that connects the bending area 2222 and the second part 22232. The width of the first part 22231 along the second direction is greater than the width of the second part 22232 along the second direction. The first part 22231 and the second part 22232 are integrally formed.

[0152] "Along the first direction, in the first electrode assembly 22a and the second electrode assembly 22b, the first part 22231 of one is spaced apart from the second part 22232 of the other." That is, along the first direction, the first part 22231 of the first electrode assembly 22a is spaced apart from the second part 22232 of the second electrode assembly 22b, and the first part 22231 of the second electrode assembly 22b is spaced apart from the second part 22232 of the first electrode assembly 22a.

[0153] The second portion 22232 of the first electrode assembly 22a and the second portion 22232 of the second electrode assembly 22b are spaced apart along the second direction.

[0154] By making the width of the first portion 22231 greater than the width of the second portion 22232, on the one hand, the first portion 22231 and the second portion 22232 can jointly form a clearance area. The clearance area of ​​the first electrode assembly 22a can avoid the second portion 22232 of the second electrode assembly 22b, and the clearance area of ​​the second electrode assembly 22b can avoid the second portion 22232 of the first electrode assembly 22a. This ensures that the orthographic projection of the connection area 2223 of the first electrode assembly 22a in the projection plane perpendicular to the thickness direction of the first wall portion 213 does not overlap with the orthographic projection of the connection area 2223 of the second electrode assembly 22b in the projection plane perpendicular to the thickness direction of the first wall portion 213. On the other hand, the width of the first portion 22231 is greater than the width of the second portion 22232. Compared with technical solutions where the width of the first portion 22231 is less than or equal to the width of the second portion 22232, the current carrying capacity can be improved.

[0155] Please refer to Figure 10 and Figure 11 In some embodiments, along the second direction, the maximum width of the first portion 22231 is A, and the width of the second portion 22232 is B, satisfying: 0.1A≤B≤0.5A.

[0156] A represents the maximum width of the first part 22231 along the second direction. During measurement, multiple measurements can be taken and the average value can be used as A.

[0157] B represents the width of the second part 22232 along the second direction. The width of the second part 22232 along the second direction can be uniform in the first direction, or the width of the second part 22232 along the second direction can be varied in the first direction.

[0158] 0.1A≤B≤0.5A means that the minimum width of the second part 22232 is greater than or equal to 0.1A, and the maximum width of the second part 22232 is less than or equal to 0.5A.

[0159] The width of the second part 22232 can be: B = 0.1A, 0.15A, 0.2A, 0.25A, 0.3A, 0.35A, 0.4A, 0.45A, 0.5A, etc.

[0160] When B ≥ 0.1A, the width of the second portion 22232 along the second direction is relatively large, which facilitates the connection between the second portion 22232 and the connecting portion 232, thereby increasing the connection area and improving the current carrying capacity. When B ≤ 0.5A, the width of the second portion 22232 along the second direction is not too large, so the second portion 22232 of the first electrode assembly 22a is less likely to interfere with the second portion 22232 of the second electrode assembly 22b, which helps to improve the reliability of the battery cell 20. Therefore, when 0.1A ≤ B ≤ 0.5A, both the current carrying capacity and reliability of the battery cell 20 can be balanced.

[0161] Optionally, 0.2A≤B≤0.5A.

[0162] The width of the second part 22232 can be: B = 0.2A, 0.22A, 0.25A, 0.28A, 0.3A, 0.32A, 0.35A, 0.38A, 0.4A, 0.42A, 0.45A, 0.48A, 0.5A, etc.

[0163] When B ≥ 0.2A, the width of the second portion 22232 along the second direction is larger, making it easier for the second portion 22232 to connect with the connecting portion 232, and further increasing the connection area between the second portion 22232 and the connecting portion 232, thereby improving the current carrying capacity. When B ≤ 0.5A, the width of the second portion 22232 along the second direction is not too large, so the second portion 22232 of the first electrode assembly 22a is less likely to interfere with the second portion 22232 of the second electrode assembly 22b, which is beneficial to improving the reliability of the battery cell 20. Therefore, when 0.2A ≤ B ≤ 0.5A, it is better to balance the current carrying capacity and reliability of the battery cell 20.

[0164] Please refer to Figure 10 and Figure 11In some embodiments, along the second direction, the maximum width of the first portion 22231 is A, and the maximum dimension of the first wall portion 213 is C, satisfying: 0.125C≤A≤0.455C.

[0165] C represents the maximum dimension of the first wall portion 213 along the second direction. During measurement, multiple measurements can be taken and the average value can be used as C.

[0166] 0.125C≤A≤0.455C means that the maximum width of the first part 22231 along the second direction is greater than or equal to 0.125C and less than or equal to 0.455C.

[0167] The maximum width of the first part 22231 along the second direction can be: A = 0.125C, 0.15C, 0.2C, 0.25C, 0.3C, 0.35C, 0.4C, 0.45C, 0.455C, etc.

[0168] When A ≥ 0.125C, the width of the first portion 22231 along the second direction is relatively large, which is beneficial to improving the current carrying capacity. When A ≤ 0.455C, the width of the first portion 22231 along the second direction is not too large, which helps to reduce the risk of interference between the first portion 22231 and other components, and improves the reliability of the battery cell 20. Therefore, when 0.125C ≤ A ≤ 0.455C, both the current carrying capacity and reliability of the battery cell 20 can be balanced.

[0169] Optionally, 0.167C≤A≤0.25C.

[0170] The maximum width of the first part 22231 along the second direction can be: A = 0.167C, 0.17C, 0.18C, 0.19C, 0.2C, 0.21C, 0.22C, 0.23C, 0.24C, 0.25C, etc.

[0171] When A ≥ 0.167C, the width of the first portion 22231 along the second direction is larger, which is more conducive to improving the current carrying capacity. When A ≤ 0.25C, the width of the first portion 22231 along the second direction is not too large, which helps to reduce the risk of interference between the first portion 22231 and other components, and improves the reliability of the battery cell 20. Therefore, when 0.167C ≤ A ≤ 0.25C, it is better to balance the current carrying capacity and reliability of the battery cell 20.

[0172] Please refer to Figure 10 and Figure 11 In some embodiments, in a projection plane perpendicular to the thickness direction of the first wall portion 213, the orthographic projection of the connecting portion 232 is completely located within the orthographic projection of the connecting area 2223 connected to the connecting portion 232.

[0173] "In the projection plane perpendicular to the thickness direction of the first wall portion 213, the orthographic projection of the connecting portion 232 lies entirely within the orthographic projection of the connecting area 2223 connected to the connecting portion 232." In other words, along the thickness direction of the first wall portion 213, the connecting area 2223 completely obscures the connecting portion 232 to which it is connected.

[0174] By ensuring that the orthographic projection of the connecting portion 232 in the projection plane perpendicular to the thickness direction of the first wall portion 213 is completely located within the orthographic projection of the connecting area 2223 connected to the connecting portion 232 in the projection plane perpendicular to the thickness direction of the first wall portion 213, the connection area between the connecting area 2223 and the connecting portion 232 is larger, which is beneficial to improving the flow capacity.

[0175] Please refer to Figure 10 and Figure 11 In some embodiments, the projection of the first wall portion 213 along its thickness direction is rectangular, and a plurality of connecting portions 232 are spaced apart along the length direction of the first wall portion 213.

[0176] "The projection of the first wall portion 213 along its thickness direction is a rectangle," meaning that the first wall portion 213 is a cuboid structure.

[0177] Please refer to Figure 8 and Figure 10 The length direction of the first wall portion 213 is the Y direction shown in the figure. In the embodiment shown in the figure, the second direction is parallel to the length direction of the first wall portion 213.

[0178] Along the length of the first wall portion 213, a plurality of connecting portions 232 are provided at intervals.

[0179] The first wall portion 213 can be a cuboid structure. By arranging multiple connecting portions 232 at intervals along the length direction of the first wall portion 213, the space in the length direction of the first wall portion 213 can be fully utilized. This facilitates welding with the first tab 222 and allows the first electrode terminal 23 to be larger, thereby improving the current carrying capacity of the battery cell 20.

[0180] Please refer to Figure 8 and Figure 10 In some embodiments, the dimension of the body portion 231 along the length direction of the first wall portion 213 is greater than the dimension of the body portion 231 along the width direction of the first wall portion 213.

[0181] Please refer to Figure 8 and Figure 10The width direction of the first wall portion 213 is the X direction shown in the figure. In the embodiment shown in the figure, the first direction is parallel to the width direction of the first wall portion 213.

[0182] The dimension of the body portion 231 along the length direction of the first wall portion 213 is greater than the dimension of the body portion 231 along the width direction of the first wall portion 213. In this case, the body portion 231 is a strip structure extending along the length direction of the first wall portion 213.

[0183] By making the dimension of the body portion 231 along the length direction of the first wall portion 213 larger than the dimension of the body portion 231 along the width direction of the first wall portion 213, the space along the length direction of the first wall portion 213 can be fully utilized, making the first electrode terminal 23 larger, which is beneficial to improving the current carrying capacity of the battery cell 20.

[0184] In some embodiments, the plurality of electrode assemblies 22 includes a third electrode assembly, wherein the first tab 222 of the third electrode assembly is stacked with the first tab 222 of the first electrode assembly 22a and is connected to a connecting portion 232. And / or the plurality of electrode assemblies 22 includes a fourth electrode assembly, wherein the first tab 222 of the fourth electrode assembly is stacked with the first tab 222 of the second electrode assembly 22b and is connected to another connecting portion 232.

[0185] The third electrode assembly can be located on the side of the first electrode assembly 22a opposite to the second electrode assembly 22b. The first tab 222 of the third electrode assembly and the first tab 222 of the first electrode assembly 22a are stacked together along the thickness direction of the first wall portion 213. After the first tab 222 of the third electrode assembly and the first tab 222 of the first electrode assembly 22a are stacked together, they can be welded together to a connecting portion 232.

[0186] The fourth electrode assembly can be located on the side of the second electrode assembly 22b opposite to the first electrode assembly 22a. The first tab 222 of the fourth electrode assembly and the first tab 222 of the second electrode assembly 22b are stacked together along the thickness direction of the first wall portion 213. After the first tab 222 of the fourth electrode assembly and the first tab 222 of the second electrode assembly 22b are stacked together, they can be welded together to another connecting portion 232.

[0187] The first tab 222 of the third electrode assembly is stacked with the first tab 222 of the first electrode assembly 22a and connected to a common connection portion 232. This facilitates electrical connection between the first tab 222 of the third electrode assembly and the first electrode terminal 23, and the connection area between the first tab 222 and the first electrode terminal 23 is large, providing strong current-carrying capacity. Furthermore, it reduces the number of connection portions 232, minimizing the space occupied by the first electrode terminal 23 within the battery cell 20 and reducing the risk of interference between the first electrode terminal 23 and other components. Similarly, the first tab 222 of the fourth electrode assembly is stacked with the first tab 222 of the second electrode assembly 22b and connected to another connection portion 232. This also facilitates electrical connection between the first tab 222 of the fourth electrode assembly and the first electrode terminal 23, and the connection area between the first tab 222 and the first electrode terminal 23 is large, providing strong current-carrying capacity. On the other hand, it helps to reduce the number of connecting parts 232, reduce the space occupied by the first electrode terminal 23 in the internal space of the battery cell 20, and reduce the risk of interference between the first electrode terminal 23 and other components.

[0188] In some embodiments, the first tab 222 and the connecting portion 232 are welded together.

[0189] "The first electrode 222 and the connecting part 232 are welded together" means that the first electrode 222 and the connecting part 232 are directly connected by welding.

[0190] By welding the first tab 222 and the connecting part 232 together, the welding process is relatively simple, which helps to reduce manufacturing costs. On the other hand, the connection between the first tab 222 and the connecting part 232 is strong, making the connection between the first tab 222 and the first electrode terminal 23 less prone to failure, which helps to improve the reliability of the battery cell 20.

[0191] Please refer to this again. Figure 5 , Figure 8 and Figure 9 In some embodiments, the battery cell 20 further includes a plurality of seals 24, which are provided one-to-one with the connecting portion 232 and are used to seal the connecting portion 232 and the first wall portion 213.

[0192] The seal 24 has sealing properties, and the battery cell 20 may include two, three, four, or more seals 24. Each seal 24 corresponds one-to-one with a connection portion 232. Each seal 24 seals one connection portion 232 and one first wall portion 213. For example, the seal 24 may be at least partially disposed between the outer peripheral surface of the connection portion 232 and the wall surface of the mounting hole 2131. The seal 24 may be a sealant, gasket, sealing ring, etc.

[0193] By sealing the connection portion 232 and the first wall portion 213 with the sealing element 24, the risk of electrolyte in the battery cell 20 flowing out of the battery cell 20 from the gap between the connection portion 232 and the first wall portion 213 can be reduced, and the risk of external impurities entering the battery cell 20 can be reduced, which is beneficial to improving the reliability of the battery cell 20.

[0194] Please refer to Figure 5 , Figure 8 and Figure 9 In some embodiments, a portion of the seal 24 is disposed between the outer peripheral surface of the connection portion 232 and the wall surface of the mounting hole 2131, and another portion of the seal 24 is disposed between the body portion 231 and the first wall portion 213.

[0195] The seal 24 includes a third part and a fourth part connected together. The third part is disposed between the outer peripheral surface of the connecting part 232 and the wall surface of the mounting hole 2131 to seal the gap between the outer peripheral surface of the connecting part 232 and the wall surface of the mounting hole 2131. The fourth part is disposed between the body part 231 and the first wall part 213 to seal the gap between the body part 231 and the first wall part 213.

[0196] By placing a portion of the seal 24 between the outer peripheral surface of the connecting portion 232 and the wall surface of the mounting hole 2131, the gap between the outer peripheral surface of the connecting portion 232 and the wall surface of the mounting hole 2131 is sealed. By placing another portion of the seal 24 between the body portion 231 and the first wall portion 213, the gap between the body portion 231 and the first wall portion 213 is sealed. In this way, the seal 24 can seal two positions, thereby further reducing the risk of electrolyte in the battery cell 20 flowing out of the battery cell 20 from the gap between the connecting portion 232 and the first wall portion 213, and further reducing the risk of external impurities entering the battery cell 20, which is beneficial to improving the reliability of the battery cell 20.

[0197] Please refer to Figure 5 , Figure 8 and Figure 9 In some embodiments, the connecting portion 232 is cylindrical, and the sealing member 24 is an annular structure surrounding the connecting portion 232.

[0198] The connecting part 232 has a cylindrical structure, and the sealing element 24 has a circular structure, with the sealing element 24 surrounding the outside of the connecting part 232. For example, the sealing element 24 can be sleeved on the outside of the connecting part 232.

[0199] The connecting part 232 is cylindrical, and the sealing element 24 is a ring structure surrounding the connecting part 232. The ring structure of the sealing ring has more uniform force, higher stability, and better sealing effect. It can not only reduce the risk of electrolyte flowing out of the battery cell 20, but also reduce the risk of external impurities entering the battery cell 20, which is conducive to improving the reliability of the battery cell 20.

[0200] Please refer to Figure 8 and Figure 9 In some embodiments, the battery cell 20 includes an insulator 26 and a connector 27. The insulator 26 connects the connector 27 and the body portion 231 and insulates and isolates the connector 27 and the body portion 231. The connector 27 is located on the side of the first wall portion 213 opposite to the electrode assembly 22 and is connected to the first wall portion 213.

[0201] The insulating member 26 connects the body portion 231 and the connector 27, and the insulating member 26 can insulate and isolate the body portion 231 and the connector 27, so that the first electrode terminal 23 is insulated from the first wall portion 213. For example, the insulating member 26 can be plastic, rubber, etc.

[0202] The connector 27 is a connection structure for mounting the first electrode terminal 23 to the first wall portion 213. Optionally, the connector 27 is welded to the first wall portion 213.

[0203] Optionally, the insulating element 26 is injection molded between the connector 27 and the body 231.

[0204] The connector 27 can fix the insulator 26 and the first electrode terminal 23 to the first wall portion 213, which can easily and conveniently realize the installation of the first electrode terminal 23 and reduce manufacturing costs. In addition, the insulator 26 can insulate and isolate the connector 27 and the first electrode terminal 23, reducing the risk of short circuit caused by the first electrode terminal 23 forming an electrical connection with the first wall portion 213 through the connector 27.

[0205] In some embodiments, the battery cell 20 includes a positive electrode terminal and a negative electrode terminal, and the electrode assembly 22 includes a positive tab and a negative tab, with the positive tab connected to the positive electrode terminal and the negative tab connected to the negative electrode terminal. At least one of the positive electrode terminal and the negative electrode terminal is a first electrode terminal 23, and at least one of the positive tab and the negative tab is a first tab 222.

[0206] The battery cell 20 includes a positive electrode terminal and a negative electrode terminal. The positive tab of the electrode assembly 22 is connected to the positive electrode terminal, and the negative tab of the electrode terminal is connected to the negative electrode terminal. The positive electrode terminal serves as the positive output of the battery cell 20, and the negative electrode terminal serves as the negative output of the battery cell 20.

[0207] "At least one of the positive electrode terminal and the negative electrode terminal is the first electrode terminal 23" includes three cases: the positive electrode terminal is the first electrode terminal 23 and the negative electrode terminal is not the first electrode terminal 23; the negative electrode terminal is the first electrode terminal 23 and the positive electrode terminal is not the first electrode terminal 23; and both the positive electrode terminal and the negative electrode terminal are the first electrode terminal 23.

[0208] When the positive electrode terminal is the first electrode terminal 23 and the negative electrode terminal is not the first electrode terminal 23, the positive tab is the first tab 222 and the negative tab is not the first tab 222.

[0209] When the negative electrode terminal is the first electrode terminal 23 and the positive electrode terminal is not the first electrode terminal 23, the negative electrode tab is the first electrode tab 222 and the positive electrode tab is not the first electrode tab 222.

[0210] When both the positive electrode terminal and the negative electrode terminal are first electrode terminals 23, both the positive electrode tab and the negative electrode tab are first electrode tabs 222.

[0211] When the positive electrode tab is the first electrode tab 222, the corresponding positive electrode terminal is the first electrode terminal 23. When the negative electrode tab is the first electrode tab 222, the corresponding negative electrode terminal is the first electrode terminal 23. When both the positive and negative electrode tabs are first electrode tabs 222, the corresponding positive and negative electrode terminals are both first electrode terminals 23, and the positive electrode tab is connected to the positive electrode terminal, and the negative electrode tab is connected to the negative electrode terminal. In this way, the energy density, reliability, and overcurrent capability of the battery cell 20 can be improved.

[0212] Please refer to Figure 8 and Figure 9 In some embodiments, the housing 21 includes a housing 211 and an end cap 212, the housing 211 having an opening and the end cap 212 closing the opening, the end cap 212 being a first wall portion 213.

[0213] When the end cap 212 is the first wall portion 213, the first electrode terminal 23 is disposed on the end cap 212, which is simple and convenient to manufacture.

[0214] This application embodiment also provides a battery device 100, which includes the aforementioned battery cell 20.

[0215] This application embodiment also provides an electrical device, which includes the aforementioned battery cell 20, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0216] According to some embodiments of this application, please refer to Figures 3 to 11 .

[0217] This application provides a battery cell 20, which includes a housing 21, a first electrode terminal 23, and multiple electrode assemblies 22. The housing 21 has a first wall portion 213 with multiple mounting holes 2131. The multiple electrode assemblies 22 are housed within the housing 21, and each electrode assembly 22 includes a first tab 222, a first electrode assembly 22a, and a second electrode assembly 22b. The first electrode terminal 23 includes a body portion 231 and multiple connecting portions 232. The body portion 231 is located on the side of the first wall portion 213 facing away from the electrode assembly 22, and has a first surface 2311 facing the electrode assembly 22. The multiple connecting portions 232 protrude from the first surface 2311, and each connecting portion 232 passes through a mounting hole 2131. The first tab 222 of the first electrode assembly 22a is directly connected to one connecting portion 232, and the first tab 222 of the second electrode assembly 22b is directly connected to another connecting portion 232. By directly connecting the first tab 222 of the first electrode assembly 22a to one connection portion 232, and the first tab 222 of the second electrode assembly 22b to another connection portion 232, firstly, the current collector is eliminated, reducing its footprint on the internal space of the battery cell 20 and thus improving the energy density of the battery cell 20. Secondly, the direct connection of the first tab 222 of the first electrode assembly 22a to one connection portion 232 and the direct connection of the first tab 222 of the second electrode assembly 22b to another connection portion 232 facilitates manufacturing, minimizes mutual interference, and ensures high connection quality, thereby improving the reliability of the battery cell 20. Finally, the first tab 222 of the first electrode assembly 22a is directly connected to a single connection part 232, which helps to increase the connection area between the first tab 222 of the first electrode assembly 22a and the first electrode terminal 23. The first tab 222 of the second electrode assembly 22b is directly connected to another connection part 232, which helps to increase the connection area between the first tab 222 of the second electrode assembly 22b and the first electrode terminal 23, and helps to improve the current carrying capacity.

[0218] Electrode assembly 22 includes a main body 221. First tab 222 includes a convergence area 2221, a bending area 2222, and a connecting area 2223. The convergence area 2221 is connected to the end of the main body 221 facing the first wall portion 213. The bending area 2222 connects the convergence area 2221 and the connecting area 2223. The connecting area 2223 is located between the main body 221 and the first wall portion 213 and is connected to the connecting portion 232. In a projection plane perpendicular to the thickness direction of the first wall portion 213, the orthographic projection of the connecting area 2223 of the first electrode assembly 22a does not overlap with the orthographic projection of the connecting area 2223 of the second electrode assembly 22b. The orthographic projection of the connection area 2223 of the first electrode assembly 22a in the projection plane perpendicular to the thickness direction of the first wall portion 213 does not overlap with the orthographic projection of the connection area 2223 of the second electrode assembly 22b in the projection plane perpendicular to the thickness direction of the first wall portion 213. This reduces the space occupied in the thickness direction of the first wall portion 213, thereby increasing the energy density of the battery cell 20.

[0219] Multiple electrode assemblies 22 are arranged along a first direction. Along the first direction, the bending areas 2222 of the first electrode assembly 22a and the bending areas 2222 of the second electrode assembly 22b are located on both sides of the connecting portion 232, respectively. By arranging the bending areas 2222 of the first electrode assembly 22a and the bending areas 2222 of the second electrode assembly 22b on both sides of the connecting portion 232 along the first direction, the positions of the first electrode assembly 22a and the second electrode assembly 22b at the first tab 222 can be approximately the same. Thus, during manufacturing, the electrode sheets of the first electrode assembly 22a and the second electrode assembly 22b can be manufactured using the same process without significantly altering the existing manufacturing process, which helps to reduce the manufacturing cost of the battery cell 20. On the other hand, by positioning the bending areas 2222 of the first electrode assembly 22a and the bending areas 2222 of the second electrode assembly 22b on both sides of the connecting portion 232 along the first direction, the positions of the first tab 222 of the first electrode assembly 22a and the first tab 222 of the second electrode assembly 22b can be made closer together. This reduces the risk of interference between the first tab 222 and other components, and also reduces the space occupied inside the battery cell 20, which is beneficial to improving the energy density of the battery cell 20.

[0220] Multiple connecting portions 232 are arranged along a second direction, which is perpendicular to the first direction. A connecting region 2223 includes a first portion 22231 and a second portion 22232. The first portion 22231 connects to the bending region 2222 and the second portion 22232, and the second portion 22232 connects to the connecting portion 232. Along the second direction, the width of the first portion 22231 is greater than the width of the second portion 22232. Along the first direction, in the first electrode assembly 22a and the second electrode assembly 22b, the first portion 22231 of one is spaced apart from the second portion 22232 of the other. Along the second direction, the second portion 22232 of the first electrode assembly 22a and the second portion 22232 of the second electrode assembly 22b are spaced apart. By making the width of the first portion 22231 greater than the width of the second portion 22232, on the one hand, the first portion 22231 and the second portion 22232 can jointly form a clearance area. The clearance area of ​​the first electrode assembly 22a can avoid the second portion 22232 of the second electrode assembly 22b, and the clearance area of ​​the second electrode assembly 22b can avoid the second portion 22232 of the first electrode assembly 22a. This ensures that the orthographic projection of the connection area 2223 of the first electrode assembly 22a in the projection plane perpendicular to the thickness direction of the first wall portion 213 does not overlap with the orthographic projection of the connection area 2223 of the second electrode assembly 22b in the projection plane perpendicular to the thickness direction of the first wall portion 213. On the other hand, the width of the first portion 22231 is greater than the width of the second portion 22232. Compared with technical solutions where the width of the first portion 22231 is less than or equal to the width of the second portion 22232, the current carrying capacity can be improved.

[0221] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing has a first wall portion, and the first wall portion is provided with a plurality of mounting holes; Multiple electrode assemblies are housed within the housing, each electrode assembly including a first tab, and the multiple electrode assemblies including a first electrode assembly and a second electrode assembly; The first electrode terminal includes a body portion and a plurality of connecting portions. The body portion is disposed on the side of the first wall portion opposite to the electrode assembly. The body portion has a first surface facing the electrode assembly. The plurality of connecting portions protrude from the first surface. Each connecting portion passes through a mounting hole. The first tab of the first electrode assembly is directly connected to one of the connecting portions. The first tab of the second electrode assembly is directly connected to another connecting portion.

2. The battery cell according to claim 1, characterized in that, The electrode assembly includes a main body, and the first electrode tab includes a convergence area, a bending area, and a connecting area. The convergence area is connected to one end of the main body facing the first wall portion. The bending area connects the convergence area and the connecting area. The connecting area is located between the main body and the first wall portion and is connected to the connecting portion. In the projection plane perpendicular to the thickness direction of the first wall portion, the orthographic projection of the connection area of ​​the first electrode assembly does not overlap with the orthographic projection of the connection area of ​​the second electrode assembly.

3. The battery cell according to claim 2, characterized in that, The plurality of electrode assemblies are arranged along a first direction, and along the first direction, the bending areas of the first electrode assembly and the bending areas of the second electrode assembly are respectively located on both sides of the connecting portion.

4. The battery cell according to claim 3, characterized in that, The plurality of connecting portions are arranged along a second direction, which is perpendicular to the first direction; The connecting area includes a first part and a second part. The first part connects the bending area and the second part, and the second part is connected to the connecting portion. Along the second direction, the width of the first part is greater than the width of the second part. Along the first direction, in the first electrode assembly and the second electrode assembly, the first portion of one is spaced apart from the second portion of the other; Along the second direction, the second portion of the first electrode assembly and the second portion of the second electrode assembly are spaced apart.

5. The battery cell according to claim 4, characterized in that, Along the second direction, the maximum width of the first part is A, and the width of the second part is B, satisfying: 0.1A≤B≤0.5A.

6. The battery cell according to claim 5, characterized in that, 0.2A≤B≤0.5A.

7. The battery cell according to claim 4, characterized in that, Along the second direction, the maximum width of the first portion is A, and the maximum dimension of the first wall portion is C, satisfying: 0.125C≤A≤0.455C.

8. The battery cell according to claim 7, characterized in that, 0.167C≤A≤0.25C.

9. The battery cell according to claim 2, characterized in that, In the projection plane perpendicular to the thickness direction of the first wall portion, the orthographic projection of the connecting portion lies entirely within the orthographic projection of the connecting area connected to the connecting portion.

10. The battery cell according to claim 1, characterized in that, The projection of the first wall portion along its thickness direction is rectangular, and the plurality of connecting portions are spaced apart along the length direction of the first wall portion.

11. The battery cell according to claim 10, characterized in that, The dimension of the body portion along the length direction of the first wall portion is greater than the dimension of the body portion along the width direction of the first wall portion.

12. The battery cell according to claim 1, characterized in that, The plurality of electrode assemblies include a third electrode assembly, wherein the first tab of the third electrode assembly is stacked with the first tab of the first electrode assembly and is connected together to a connection portion; and / or The plurality of electrode assemblies include a fourth electrode assembly, wherein the first tab of the fourth electrode assembly is stacked with the first tab of the second electrode assembly and is connected together to another connection portion.

13. The battery cell according to claim 1, characterized in that, The first electrode tab and the connecting part are welded together.

14. The battery cell according to any one of claims 1-13, characterized in that, The battery cell also includes multiple sealing elements, each of which is corresponding to a connecting portion. The sealing elements are used to seal the connecting portion and the first wall portion.

15. The battery cell according to claim 14, characterized in that, A portion of the seal is disposed between the outer peripheral surface of the connector and the wall surface of the mounting hole, and another portion of the seal is disposed between the body portion and the first wall portion.

16. The battery cell according to claim 14, characterized in that, The connecting part is cylindrical, and the sealing element has a ring structure surrounding the connecting part.

17. The battery cell according to any one of claims 1-13, characterized in that, The battery cell includes an insulating component and a connector. The insulating component connects the connector and the body portion and insulates and isolates the connector and the body portion. The connector is located on the side of the first wall portion away from the electrode assembly and is connected to the first wall portion.

18. The battery cell according to any one of claims 1-13, characterized in that, The battery cell includes a positive electrode terminal and a negative electrode terminal, and the electrode assembly includes a positive electrode tab and a negative electrode tab, wherein the positive electrode tab is connected to the positive electrode terminal and the negative electrode tab is connected to the negative electrode terminal; At least one of the positive electrode terminal and the negative electrode terminal is the first electrode terminal, and at least one of the positive electrode tab and the negative electrode tab is the first electrode tab.

19. The battery cell according to any one of claims 1-13, characterized in that, The outer casing includes a housing and an end cap, the housing having an opening, the end cap closing the opening, and the end cap being the first wall portion.

20. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-19.

21. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1-19, the battery cell being used to provide electrical energy to the electrical device.

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