Battery cell, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode assembly and an electrode leading-out part. The housing has a first wall. The electrode assembly is arranged in the shell and comprises a main body part and a tab, and the tab is arranged at the end, close to the first wall, of the main body part. And the electrode leading-out component is connected with the tab. Wherein the electrode lead-out part comprises a first surface and a transition surface, the first surface faces the main body part in the thickness direction of the first wall, the transition surface is at least partially arranged on the periphery of the first surface in a surrounding mode, the transition surface is provided with a first edge connected with the first surface and a second edge away from the first surface, and the first edge points to the second edge in the direction. And the distance between the transition surface and the first wall is gradually reduced. The tab comprises a first section and a second section, the first section is connected with the first surface, and the second section is opposite to the transition surface. According to the technical scheme provided by the invention, the reliability of the battery device can be effectively improved.

Description

Technical Field

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

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

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device. The technical solution provided by this application can effectively improve the reliability of the battery device.

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

[0006] In a first aspect, some embodiments of this application provide a battery cell, which includes a casing, an electrode assembly, and an electrode lead-out component. The casing has a first wall. The electrode assembly is disposed inside the casing and includes a main body and a tab, with the tab disposed at one end of the main body near the first wall. The electrode lead-out component is connected to the tab. The electrode lead-out component includes a first surface and a transition surface. Along the thickness direction of the first wall, the first surface faces the main body, and the transition surface is at least partially circumferentially disposed around the outer periphery of the first surface. The transition surface has a first edge connected to the first surface and a second edge away from the first surface. The distance between the transition surface and the first wall gradually decreases along the direction from the first edge to the second edge. The tab includes a first segment and a second segment, the first segment being connected to the first surface and the second segment being disposed opposite to the transition surface.

[0007] In the battery cells provided in the above embodiments, by providing a transition surface with a gradually decreasing distance between the electrode lead-out component and the first wall at the end facing the electrode assembly, the electrode lead-out component is locally thinned, and the tab has a second section disposed opposite to the transition surface, so that the tab can smoothly transition to the first section through the second section and be electrically connected to the first surface of the electrode lead-out component. This reduces the bending amplitude of the tab, improves the problem of the tab cracking due to excessively steep bending, and improves the problem of the tab structure being damaged by the sharp edges or corners of the electrode lead-out component acting on the tab. This effectively improves the reliability of the battery cell, and thus effectively improves the reliability of the battery device.

[0008] According to some embodiments of this application, the second segment is in contact with the transition surface.

[0009] In the above scheme, by setting the second segment to be in contact with the transition surface, on the one hand, the transition surface and the second segment can abut and support each other, thereby improving the impact resistance of the internal circuit structure of the battery cell, thus giving the battery cell higher reliability, and consequently giving the battery device higher reliability; on the other hand, based on the electrical connection between the first segment and the first surface, by making the second segment in contact with the transition surface, the electrical connection area between the tab and the electrode lead-out component can be effectively increased, thereby improving the overcurrent capacity of the battery cell, giving the battery cell higher charge and discharge performance, and consequently giving the battery device higher charge and discharge performance.

[0010] According to some embodiments of this application, the second segment is welded to the transition surface; or, an adhesive layer is provided between the second segment and the transition surface, and the second segment and the transition surface are connected by the adhesive layer.

[0011] In the above solution, by welding or bonding the second section and the transition surface together, the impact resistance of the second section and the electrode lead-out component can be improved, and the risk of the second section and the electrode lead-out component separating from each other due to impact can be reduced. This ensures the structural reliability of the internal circuit of the battery cell to a certain extent, so that the battery cell has high reliability, and thus the battery device has high reliability.

[0012] According to some embodiments of this application, the transition surface is a chamfered surface.

[0013] In the above solution, by chamfering the end of the electrode lead-out component facing the electrode assembly, the risk of the tab being cracked by the sharp edges and corners of the electrode lead-out component can be reduced, ensuring the structural integrity of the tab to a certain extent and enabling the battery cell to have high reliability. On the other hand, the tab can smoothly transition from the second section to the first section, resulting in a smaller bending range between the main body and the tab, thereby improving the problem of the tab cracking due to excessive bending. This can effectively improve the reliability of the battery cell and thus effectively improve the reliability of the battery device.

[0014] According to some embodiments of this application, the included angle between the chamfered surface and the first surface is α, which satisfies 110°≤α≤160°.

[0015] In the above solution, by limiting the angle α between the chamfered surface and the first surface to be no less than 110° and no more than 160°, the second segment can be gently tilted relative to the first segment, thereby reducing the risk of cracking between the first segment and the main body due to excessive bending, so that the battery cell has high reliability, and thus the battery device has high reliability.

[0016] According to some embodiments of this application, the transition surface is a rounded corner surface.

[0017] In the above solution, by rounding the end of the electrode lead-out component facing the electrode assembly to form a rounded surface, the risk of the tab being cracked by the sharp edges and corners of the electrode lead-out component can be effectively reduced, ensuring the structural integrity of the tab to a certain extent and enabling the battery cell to have high reliability. On the other hand, the tab can be transitioned to the first section through the second arc, resulting in a smaller bending range between the main body and the tab, thereby improving the problem of the tab cracking due to excessively steep bending. This can effectively improve the reliability of the battery cell and thus effectively improve the reliability of the battery device.

[0018] According to some embodiments of this application, the radius of the rounded corner is r, which satisfies 0.2mm≤r≤0.8mm.

[0019] In the above solution, by limiting the radius r of the rounded corner surface to be no less than 0.2 mm and no more than 0.8 mm, the main body and the first segment can be transitioned by an arc, which effectively reduces the risk of cracking due to excessive bending between the first segment and the main body, making the battery cell have high reliability, and thus making the battery device have high reliability.

[0020] According to some embodiments of this application, on a projection plane perpendicular to the thickness direction of the first wall, the distance between the projection of the first edge and the projection of the second edge is B, which satisfies 0.5mm≤B≤3mm.

[0021] In the above scheme, on the projection plane perpendicular to the thickness direction of the first wall, by limiting the distance between the projection of the first edge and the projection of the second edge to be no less than 0.5 mm and no more than 3 mm, under the condition that the tab can utilize the lateral space of the electrode lead-out component to improve the volumetric energy density of the battery cell, the bending degree of the tab can be appropriate, reducing the risk of tab cracking, thereby improving the reliability of the battery cell, and further improving the reliability of the battery device.

[0022] According to some embodiments of this application, the tab extends beyond the second edge along the direction from the main body to the first wall.

[0023] In the above scheme, by setting the tab to extend beyond the second edge, the tab can utilize the space between the second edge and the first wall, thereby enabling the formation of a larger main body, which in turn allows for a larger electrochemical substance inside the battery cell, resulting in a higher volumetric energy density for the battery cell and consequently, a higher volumetric energy density for the battery device.

[0024] According to some embodiments of this application, the electrode tab further includes a third segment, the second segment connecting the first segment and the third segment, the third segment extending beyond the first surface along the direction of the main body towards the first wall.

[0025] In the above scheme, the tab has at least a three-section structure, including at least a first section, a second section and a third section. The third section transitions smoothly to the first section through the second section, which improves the risk of cracking due to the tab bending too steeply relative to the main body, thereby making the battery cell have high reliability, and thus making the battery device have high reliability.

[0026] According to some embodiments of this application, the electrode lead-out component further includes a first outer peripheral surface and a second surface. Along the thickness direction of the first wall, the second surface and the first surface are opposite to each other, and the first outer peripheral surface connects the transition surface and the second surface.

[0027] In the above solution, by setting a transition surface between the first outer peripheral surface and the second surface, the risk of cracking due to excessively steep bending of the tab can be reduced, thus enabling the battery cell to have higher reliability. On the other hand, the difficulty of forming the transition surface can be reduced, for example, by forming the transition surface through chamfering or rounding processes, which is conducive to improving the manufacturing efficiency and yield of the battery cell, and thus conducive to improving the manufacturing efficiency and yield of the battery device.

[0028] According to some embodiments of this application, along the thickness direction of the first wall, the distance between the first surface and the second surface is H, and the distance between the second surface and the second edge is h, satisfying 0.2H≤h≤0.6H.

[0029] In the above scheme, the distance h between the second surface and the second edge can be regarded as the thickness of the locally thinned area of ​​the electrode lead-out component. By ensuring that the distance h between the second surface and the second edge is not less than 0.2H, the forming difficulty of the transition surface can be reduced, which is beneficial to the processing and forming efficiency of the electrode lead-out component, thereby improving the manufacturing efficiency and yield of the battery cell. By ensuring that the distance h between the second surface and the second edge is not greater than 0.6H, the transition surface can have a longer transition path, which is beneficial to the tab transitioning smoothly from the second section to the first section, effectively reducing the risk of the tab cracking due to the transition of bending degree, and making the battery cell have higher reliability. Therefore, by limiting the distance h between the second surface and the second edge to not less than 0.2H and not greater than 0.6H, the manufacturing efficiency, yield, and reliability of the battery cell can be balanced, and thus the manufacturing efficiency, yield, and reliability of the battery device can be balanced as well.

[0030] According to some embodiments of this application, a battery cell includes electrode terminals and an adapter. The electrode terminals are disposed on a first wall. The adapter electrically connects the electrode terminals and the tabs. The electrode lead-out component is the adapter.

[0031] In the above scheme, the electrode terminals are electrically connected to the tabs via an adapter, and the adapter is provided with a transition surface. On the one hand, this reduces the difficulty of electrically connecting the tabs and electrode terminals, resulting in a larger current-carrying area between the tabs and electrode terminals, which is beneficial to improving the charging and discharging performance of the battery cell. On the other hand, due to the setting of the transition surface, the tabs can smoothly transition from the second stage to the first stage, effectively reducing the risk of the tabs cracking due to excessive bending, thus giving the battery cell and battery device higher reliability.

[0032] According to some embodiments of this application, a battery cell includes an electrode terminal disposed on a first wall; wherein, the electrode lead-out component is an electrode terminal.

[0033] In the above scheme, the electrode terminals are directly electrically connected to the tabs, simplifying the internal structure of the battery cell and allowing for the placement of more electrochemical substances. This effectively increases the volumetric energy density of the battery cell and the battery device. Simultaneously, the transition surface at the electrode terminals allows the tabs to smoothly transition from the second stage to the first stage, effectively mitigating the risk of cracking due to excessive bending and resulting in higher reliability for both the battery cell and the battery device.

[0034] According to some embodiments of this application, the battery cell further includes a conductive element, at least a portion of which is located on the outside of the first wall, and the conductive element is connected to the electrode terminals.

[0035] In the above scheme, the conductive element is connected to the electrode terminal and is at least partially disposed on the outside of the first wall to facilitate connection with an external busbar component, thereby realizing the input or output of the battery cell's electrical energy.

[0036] According to some embodiments of this application, the battery cell further includes a first insulating member, which is at least partially disposed between the first wall and the electrode assembly, and the electrode terminals pass through the first insulating member.

[0037] In the above scheme, by setting a first insulating component between the first wall and the electrode assembly, the risk of internal short circuit caused by contact between the internal circuit structure of the battery cell and the first wall can be reduced. On the other hand, it can also constrain the electrode assembly, reduce the risk of damage to the internal circuit structure of the battery cell due to the movement of the electrode assembly, thereby making the battery cell have high reliability and thus making the battery device highly reliable.

[0038] According to some embodiments of this application, a limiting portion is provided on the side of the first insulating member facing the electrode assembly. The limiting portion is at least partially arranged around the outer periphery of the electrode terminal to limit the radial displacement of the electrode terminal along the electrode terminal.

[0039] In the above solution, by providing a limiting part protruding on the inner side of the first insulating member, the electrode terminal can be constrained and the radial displacement of the electrode terminal can be limited. This reduces the risk of the electrode terminal separating from the tab or from the external busbar component, and to a certain extent ensures the reliability of the internal circuit structure or external circuit structure of the battery cell, thereby improving the reliability of the battery device.

[0040] According to some embodiments of this application, the limiting portion does not extend beyond the second edge in the direction from the first wall toward the main body.

[0041] In the above solution, by setting the limiting part to not exceed the second edge, the limiting part can reduce the space occupied by the limiting part inside the battery cell while constraining the electrode terminals. This allows the battery cell to accommodate more electrochemical substances, thereby improving the volumetric energy density of the battery cell and, consequently, improving the volumetric energy sealing of the battery device.

[0042] According to some embodiments of this application, the outer shell is a square shell, the dimension of the outer shell in the first direction is T1, the dimension of the outer shell in the second direction is W1, and the dimension of the outer shell in the thickness direction of the first wall is H1, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, and the first direction, the second direction, and the thickness direction of the first wall are all perpendicular to each other.

[0043] In the above scheme, by limiting the external contour dimensions of the battery cell, the internal space of the battery cell is made larger to accommodate more electrochemical substances, thus forming a battery cell with a larger capacity. For battery cells with larger capacity, the electrode lead-out components are designed to have a smooth transition surface, which facilitates smooth bending of the tabs and reduces the risk of tab cracking. This allows the battery cells with larger capacity to be reliably charged and discharged, resulting in high energy storage reliability or high discharge reliability for battery devices using such battery cells.

[0044] Secondly, some embodiments of this application also provide a battery device, including the battery cell provided in the first aspect.

[0045] Thirdly, some embodiments of this application also provide an electrical device, including a battery cell provided in the first aspect and / or a battery device provided in the second aspect, wherein the battery cell is used to provide electrical energy.

[0046] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0047] 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.

[0048] Figure 1 This is a schematic diagram of the vehicle structure in some embodiments of this application;

[0049] Figure 2 This is an exploded perspective view of the battery device in some embodiments of this application;

[0050] Figure 3 This is an exploded perspective view of a battery cell in some embodiments of this application;

[0051] Figure 4 This is an exploded perspective view of a battery cell in some other embodiments of this application;

[0052] Figure 5 This is a schematic diagram of the internal structure of a single battery cell in some embodiments of this application;

[0053] Figure 6 for Figure 5 Enlarged view of point S in the middle;

[0054] Figure 7 This is a partial structural schematic diagram of the electrode lead-out component and electrode tab in some embodiments of this application;

[0055] Figure 8 This is a schematic diagram of the electrode lead-out component and electrode tab in some embodiments of this application;

[0056] Figure 9 This is a schematic diagram of the electrode lead-out component and electrode tab in other embodiments of this application;

[0057] Figure 10 This is a schematic diagram of the adapter in some embodiments of this application;

[0058] Figure 11 This is an exploded perspective view of the partial structure of a battery cell in some embodiments of this application;

[0059] Figure 12 This is a schematic diagram of the electrode terminals in some embodiments of this application;

[0060] Figure 13 This is a schematic diagram of a single battery cell in some embodiments of this application.

[0061] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 10 - Battery Cell; 20 - Housing; 21 - First Housing Body; 22 - Second Housing Body; 11 - Outer Shell; 110 - Housing; 111 - First Wall; 12 - Electrode Assembly; 120 - Main Body; 121 - Electrode Tab; 1210 - First Section; 1211 - Second Section; 1212 - Third Section; 1213 - Corner Section; 1214 - Root Section; 13 - Electrode Lead-out Component; 13 0 - First surface; 131 - Transition surface; 1310 - First edge; 1311 - Second edge; 132 - First outer peripheral surface; 133 - Second surface; 14 - Electrode terminal; 140 - Terminal body; 141 - Riveting post; 15 - Adapter; 150 - First part; 151 - Second part; 16 - Conductive component; 17 - First insulating component; 170 - Limiting part; 18 - Second insulating component; 19 - Sealing component; x - First direction; y - Second direction; z - Thickness direction of the first wall. Detailed Implementation

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] In this application, "multiple" means two or more (including two).

[0069] 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.

[0070] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0071] 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, helps prevent short circuits to some extent while allowing active ions to pass through.

[0072] 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.

[0073] 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.

[0074] 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.).

[0075] 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 battery positive electrode active materials 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 / 3 Mn 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 NCM1), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM6), 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 0.05 At least one of O2 and its modified compounds.

[0076] 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.

[0077] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0078] 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 silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed 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.).

[0079] 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.

[0080] 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.

[0081] 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 battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0082] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0083] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0084] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0085] 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.

[0086] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0091] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0092] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0093] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0094] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0095] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0096] In some implementations, the electrode assembly has a stacked structure.

[0097] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0098] 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.

[0099] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0100] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0101] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0102] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0103] 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.

[0104] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0105] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0106] 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 connected in series, parallel, or mixed connections via a busbar.

[0107] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0108] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0109] 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.

[0110] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. The energy storage device includes energy storage containers, energy storage cabinets, etc. In some embodiments, one or more energy storage devices may constitute at least part of an energy storage system.

[0115] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, and discharge capacity. Furthermore, the reliability of the battery device must also be taken into account.

[0116] Generally, a battery cell includes a casing, electrode lead-out components, and electrode assemblies. The electrode lead-out components are connected to the tabs of the electrode assemblies to enable charging and discharging.

[0117] In related technologies, to save space, the tabs are often bent to utilize the lateral space of the electrode lead-out components and improve volumetric energy density. However, the end of the electrode lead-out component facing the electrode assembly is a right-angle structure, and the bent part of the tab corresponds to this and is bent at a right angle. On the one hand, because the bending degree is too steep, the tab is prone to cracking at the bending point, affecting the reliability of the battery cell. On the other hand, during the battery cell assembly or use, external impacts cause the right-angle structure of the electrode lead-out component to act on the tab. Due to the small contact area of ​​the sharp edges or corners, the tab structure is easily damaged, affecting the reliability of the battery cell and, consequently, the reliability of the battery assembly.

[0118] In view of this, to improve the problem of excessively steep bending of the tabs, which causes the tabs to crack and affects the reliability of the battery cell and battery device, some embodiments of this application provide a battery cell, which includes a casing, an electrode assembly, and an electrode lead-out component. The casing has a first wall. The electrode assembly is disposed inside the casing and includes a main body and a tab, with the tab disposed at one end of the main body near the first wall. The electrode lead-out component is connected to the tab. The electrode lead-out component includes a first surface and a transition surface. Along the thickness direction z of the first wall, the first surface faces the main body, and the transition surface is at least partially circumferentially disposed around the outer periphery of the first surface. The transition surface has a first edge connected to the first surface and a second edge away from the first surface. Along the direction from the first edge to the second edge, the distance between the transition surface and the first wall gradually decreases. The tab includes a first segment and a second segment. The first segment is connected to the first surface, and the second segment is disposed opposite to the transition surface.

[0119] In the battery cells provided in the above embodiments, by providing a transition surface with a gradually decreasing distance between the electrode lead-out component and the first wall at the end facing the electrode assembly, the electrode lead-out component is locally thinned, and the tab has a second section disposed opposite to the transition surface, so that the tab can smoothly transition to the first section through the second section and be electrically connected to the first surface of the electrode lead-out component. This results in a smaller bending amplitude of the tab, which can improve the problem of the tab cracking due to excessively steep bending, and improve the problem of the tab structure being damaged by the sharp edges or corners of the electrode lead-out component acting on the tab, thereby effectively improving the reliability of the battery cell, and thus effectively improving the reliability of the battery device.

[0120] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0121] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0122] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0123] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0124] In some embodiments of this application, the battery device 100 can not only serve as the operating power or 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.

[0125] Please refer to Figure 2 , Figure 2 This is an exploded perspective view of the battery device 100 in some embodiments of this application. The battery device 100 includes a housing 20 and battery cells 10, the battery cells 10 being housed within the housing 20.

[0126] The housing 20 provides assembly space for the battery cell 10, and can adopt various structures. In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, which overlap each other, and together define an assembly space for accommodating the battery cell 10. The second housing body 22 may be a hollow structure open at one end, and the first housing body 21 may be a plate-like structure, with the first housing body 21 covering the open side of the second housing body 22 so that the first housing body 21 and the second housing body 22 together define the assembly space; alternatively, the first housing body 21 and the second housing body 22 may both be hollow structures open on one side, with the open side of the first housing body 21 covering the open side of the second housing body 22.

[0127] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 20 is a cuboid.

[0128] In the battery device 100, there can be one or more battery cells 10 disposed within the housing 20. When there are multiple battery cells 10 disposed within the housing 20, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within the housing 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 10 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 20.

[0129] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0130] For example, the housing 20 is provided with a plurality of battery cell assemblies, each battery cell assembly including a plurality of battery cells 10 stacked on top of each other, and the plurality of battery cells 10 are connected in series with each other through a busbar. In some embodiments, the plurality of battery cell assemblies can be connected in series with each other through a busbar.

[0131] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 10 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 10 has a cuboid structure.

[0132] This application provides a battery cell 10; please refer to [link / reference]. Figures 3-7 , Figure 3 This is an exploded perspective view of the battery cell 10 in some embodiments of this application. Figure 4 This is an exploded perspective view of the battery cell 10 in some other embodiments of this application. Figure 5 This is a schematic diagram of the internal structure of the battery cell 10 in some embodiments of this application. Figure 6 for Figure 5 Enlarged view of point S in the middle. Figure 7 This is a partial structural schematic diagram of the electrode lead-out component 13 and the tab 121 in some embodiments of this application.

[0133] Some embodiments of this application provide a battery cell 10, which includes a housing 11, an electrode assembly 12, and an electrode lead-out component 13. The housing 11 has a first wall 111. The electrode assembly 12 is disposed inside the housing 11 and includes a main body 120 and a tab 121. The tab 121 is disposed at one end of the main body 120 near the first wall 111. The electrode lead-out component 13 is connected to the tab 121. The electrode lead-out component 13 includes a first surface 130 and a transition surface 131. Along the thickness direction z of the first wall, the first surface 130 faces the main body 120. The transition surface 131 is at least partially circumferentially disposed around the outer periphery of the first surface 130. The transition surface 131 has a first edge 1310 connected to the first surface 130 and a second edge 1311 away from the first surface 130. Along the direction from the first edge 1310 to the second edge 1311, the distance between the transition surface 131 and the first wall 111 gradually decreases. The tab 121 includes a first segment 1210 and a second segment 1211. The first segment 1210 is connected to the first surface 130, and the second segment 1211 is disposed opposite to the transition surface 131.

[0134] The housing 11 is a component for housing the electrode assembly 12. The housing 11 can also be used to house an electrolyte, such as an electrolyte solution. See also... Figure 3In some embodiments, the housing 11 includes a housing 110 and an end cap. The housing 110 has an internal cavity for accommodating the electrode assembly 12. The housing 110 has an opening communicating with the cavity. The end cap closes onto the opening of the housing 110 to form a sealed connection, thereby creating a sealed space for accommodating the electrode assembly 12 and the electrolyte. The end cap can be connected to the housing 110 by welding, bonding, snap-fitting, or other connection methods. Optionally, the housing 11 may further include a base plate. Openings are formed at both ends of the housing 110, one of which is closed by the end cap, and the other opening is closed by the base plate.

[0135] In some embodiments, the material of the housing 11 can be metal or a combination of metal and non-metal. For example, the housing 11 can be made of metal, such as aluminum, copper, iron, aluminum, steel or aluminum alloy. Alternatively, some parts of the housing 11 can be made of metal, while the rest can be made of non-metal. For example, the end cap of the housing 11 can be made of metal, while the shell 110 or other parts of the housing 11 can be made of non-metallic materials.

[0136] In some embodiments, the housing 11 may be a sealed structure or a non-sealed structure.

[0137] As an example, when the outer casing 11 is a non-sealed structure, it only serves to protect the electrode assembly 12. The battery cell 10 includes a sealant for encapsulating the electrode assembly 12 and other components such as the electrolyte. The outer casing 11 is disposed outside the sealant to protect the electrode assembly 12 or to limit the expansion of the electrode assembly 12. Specifically, the sealant can be a bag-shaped insulating material or an aluminum-plastic film, covering the outside of the electrode assembly 12 and serving to insulate the electrode assembly 12 and the outer casing 11.

[0138] In some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be placed into the housing 110 first, and electrolyte can be filled into the housing 110. Then, the end cap can be closed onto the opening of the housing 110 to complete the assembly of the battery cell 10. Alternatively, in some embodiments, when assembling the battery cell 10, the electrode assembly 12 can be placed into the housing 110 first, and then the end cap can be closed onto the opening of the housing 110. Electrolyte can then be filled into the housing 110 through the injection hole on the end cap, and then the injection hole can be closed to complete the assembly of the battery cell 10.

[0139] The outer casing 11 can be of various shapes, such as a cylinder or a prism. The shape of the outer casing 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cylindrical structure, then a cylindrical outer casing 11 can be selected. If the electrode assembly 12 is a flat structure, then the outer casing 11 can be square.

[0140] The first wall 111 is a partial structure of the outer casing 11. The first wall 111 can be used to support the electrode terminal 14, which can be connected to an external busbar to realize the input and output of electrical energy. The external busbar can be a power strip. In some embodiments, the first wall 111 can be a part of the casing 110, such as the side wall or bottom wall of the casing 110. In some embodiments, the first wall 111 can be an end cap.

[0141] The electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. The structure of the electrode assembly 12 can be various. For example, the electrode assembly 12 includes an electrode and a separator. For example, the electrode assembly 12 can be a wound structure formed by winding a positive electrode, a separator and a negative electrode, or a stacked structure formed by arranging a positive electrode, a separator and a negative electrode in layers.

[0142] Optionally, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0143] The electrode assembly 12 includes a main body 120 and tabs 121, with the main body 120 being the primary portion of the electrode assembly 12. In some embodiments, the positive electrode in the main body 120 has a positive active material, and the negative electrode has a negative active material. The tabs 121 are electrode structures extending from the main body 120, which may not include active material, and are used for inputting or outputting the positive or negative electrode of the electrode assembly 12. The tabs 121 are electrically connected to the electrode terminals 14 to achieve an electrical connection between the electrode assembly 12 and the electrode terminals 14. In some embodiments, the tabs 121 are located at one end of the electrode assembly 12 in the thickness direction z of the first wall, near the first wall 111.

[0144] Optionally, please see Figure 6 The tab 121 extends from the end face of the main body 120 facing the first wall 111 and is bent. In some embodiments of this application, the tab 121 may include a root segment 1214, a corner segment 1213, a third segment 1212, a second segment 1211, and a first segment 1210. The root segment 1214 is connected to the main body 120, the corner segment 1213 connects the root segment 1214 and the third segment 1212, and along the thickness direction z of the first wall, the third segment 1212 protrudes from the main body 120. The end of the third segment 1212 away from the corner segment 1213 is connected to the second segment 1211, and the end of the second segment 1211 away from the third segment 1212 is connected to the first segment 1210. The first segment 1210 may be a freely suspended part of the tab 121.

[0145] In some embodiments, along the thickness direction z of the first wall, the first segment 1210 is closer to the electrode assembly 12 than the third segment 1212.

[0146] Optionally, the electrode assembly 12 housed within the housing 11 can be one or more. For example, in... Figure 3 In this embodiment, the outer casing 11 of the battery cell 10 is provided with two electrode assemblies 12, which are stacked along their thickness direction. That is, the two electrode assemblies 12 are stacked along the thickness direction of the battery cell 10. Of course, in other embodiments, the electrode assemblies 12 housed in the outer casing 11 can be one, three, four, five, six, seven or eight, etc.

[0147] In some embodiments, the battery cell 10 includes an electrode terminal 14 mounted on the first wall 111. The electrode terminal 14 is electrically connected to the electrode assembly 12, allowing current to flow into or out of the tab 121 via the electrode terminal 14. In some embodiments, the electrode terminal 14 is made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal.

[0148] Optionally, the electrode terminal 14 is a block structure, fixed to the first wall 111 by a connector. The connector may be at least partially arranged around the outer periphery of the electrode terminal 14, and the connector is connected to the first wall 111 to fix the electrode terminal 14 to the first wall 111. For example, the connector may be a retaining ring, or the connector may be a flange protruding from the first wall 111, and the electrode terminal 14 may be clamped between the flange and the first wall 111 by bending the connector.

[0149] Optionally, the electrode terminal 14 is fixed to the first wall 111 by a conductive member 16. At least a portion of the electrode terminal 14 is disposed on the inner side of the first wall 111 (i.e., the side facing the interior of the housing 11), and at least a portion of the conductive member 16 is disposed on the outer side of the first wall 111. The electrode terminal 14 and the conductive member 16 are interconnected to jointly clamp the first wall 111. The conductive member 16 is used to connect to an external busbar component, and the electrode terminal 14 is connected to the tab 121. The connection relationship between the electrode terminal 14 and the conductive member 16 includes, but is not limited to, welding, riveting, threaded connection, or other connection methods. Exemplarily, the electrode terminal 14 has a riveting post, and the conductive member 16 has a riveting hole. The riveting post passes through the first wall 111 and is riveted into the riveting hole.

[0150] In some embodiments, the conductive element 16 is made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal.

[0151] In some embodiments, a first insulating member 17 is disposed on the inner side of the first wall 111, and at least a portion of the first insulating member 17 is disposed between the electrode terminal 14 and the first wall 111. Optionally, the first insulating member 17 may be a lower plastic material. In some embodiments, a second insulating member 18 is disposed on the outer side of the first wall 111, and at least a portion of the second insulating member 18 is disposed between the conductive member 16 and the first wall 111. Optionally, the second insulating member 18 may be an upper plastic material.

[0152] In some embodiments, electrode terminal 14 can be directly connected to tab 121, for example, electrode terminal 14 can be soldered to tab 121.

[0153] In some embodiments, the electrode terminal 14 can be connected to the tab 121 via an adapter 15. Exemplarily, the tab 121 of the electrode assembly 12 is composed of multiple sub-tabs 121 stacked together. One end of the adapter 15 can be welded to the tab 121 first, and then the other end of the adapter 15 can be welded to the electrode terminal 14.

[0154] The electrode lead-out component 13 is a component connected to the electrode tab 121, used to realize the input and output of electrical energy. Optionally, please refer to Figure 3 The electrode lead-out component 13 can be an electrode terminal 14, which is directly connected to the electrode tab 121. Optionally, please refer to... Figure 4 The electrode lead-out component 13 can be an adapter 15, one end of which is connected to the tab 121 and the other end is connected to the electrode terminal 14.

[0155] Please see Figure 6 and Figure 7 The electrode lead-out component 13 includes a first surface 130, which is the surface of the electrode lead-out component 13 facing the main body portion 120. Optionally, the first surface 130 is the surface of the electrode lead-out component 13 closest to the main body portion 120. The first surface 130 is connected to the tab 121 to achieve an electrical connection between the electrode lead-out component 13 and the tab 121. Optionally, the first surface 130 is welded to the tab 121.

[0156] The transition surface 131 is a component that is at least partially circumferentially disposed around the first surface 130. The transition surface 131 has a first edge 1310 connected to the first surface 130 and a second edge 1311 away from the first surface 130.

[0157] Optionally, the transition surface 131 is annular, and the inner periphery of the transition surface 131 (i.e., the first edge 1310) is connected to the outer edge of the first surface 130. Optionally, the transition surface 131 may be provided only on the side of the electrode lead-out component 13 along the first segment 1210 pointing to the second segment 1211.

[0158] In some embodiments, along the thickness direction z of the first wall, the electrode lead-out component 13 has a first surface 130 and a second surface 133 that are opposite to each other. The electrode lead-out component 13 also includes a first outer peripheral surface 132, which surrounds the edge of the second surface 133. The first edge 1310 of the transition surface 131 connects to the edge of the first surface 130, and the second edge 1311 of the transition surface 131 connects to the first outer peripheral surface 132 and is away from the edge of the first surface 130.

[0159] In other embodiments, along the thickness direction z of the first wall, the electrode lead-out component 13 has a first surface 130 and a second surface 133 opposite to each other, the first edge 1310 of the transition surface 131 connects to the edge of the first surface 130, and the second edge 1311 of the transition surface 131 connects to the edge of the second surface 133.

[0160] The phrase "the distance between the transition surface 131 and the first wall 111 gradually decreases along the direction from the first edge 1310 to the second edge 1311" can be understood as the thickness of the portion of the electrode lead-out component 13 corresponding to the transition surface 131 gradually decreasing. It can also be understood as the transition surface 131 being an inclined surface or a curved surface, for example, the first surface 130 smoothly transitions to the second surface 133 through the transition surface 131. Alternatively, the first surface 130 smoothly transitions to the first outer peripheral surface 132 through the transition surface 131. It can also be understood as the portion of the electrode lead-out component 13 corresponding to the transition surface 131 not having a right angle. Exemplarily, the electrode lead-out component 13 includes a first surface 130, a first outer peripheral surface 132, and a second surface 133. The transition surface 131 can be a chamfered surface, a rounded surface, or a curved surface formed between the first outer peripheral surface 132 and the first surface 130.

[0161] The phrase "the second segment 1211 is positioned opposite to the transition surface 131" can be understood as follows: the second segment 1211 is positioned corresponding to the transition surface 131. The surface of the second segment 1211 facing the transition surface 131 can be parallel to or nearly parallel to the transition surface 131, allowing the first segment 1210 to smoothly transition to the other structures of the tab 121 through the second segment 1211. Optionally, the transition surface 131 is a chamfered surface, and the second segment 1211 is generally inclined, with the angle of inclination corresponding to the angle of the chamfered surface. Optionally, the transition surface 131 is a rounded corner surface, and the second segment 1211 is generally arc-shaped.

[0162] In some embodiments, such as Figure 7 The second segment 1211 and the transition surface 131 are spaced apart, with a gap between them. In other embodiments, the second segment 1211 and the transition surface 131 are in contact with each other.

[0163] In the battery cell 10 provided in some of the above embodiments, by providing a transition surface 131 with a gradually decreasing distance between the electrode lead-out component 13 and the first wall 111 at the end facing the electrode assembly 12, the electrode lead-out component 13 is locally thinned, and the tab 121 has a second segment 1211 disposed opposite to the transition surface 131, so that the tab 121 can smoothly transition to the first segment 1210 through the second segment 1211 and be electrically connected to the first surface 130 of the electrode lead-out component 13, thereby reducing the bending amplitude between the main body 120 and the tab 121 and improving the tab's performance. The problem of cracking due to excessively steep bending of tab 121, and the problem of damage to tab 121 structure caused by the sharp edges or corners of electrode lead-out component 13 acting on tab 121, can effectively improve the reliability of battery cell 10, and thus effectively improve the reliability of battery device 100. On the other hand, compared with the solution where electrode lead-out component 13 is not locally thinned, that is, no transition surface 131 is provided, the length of tab 121 can be reduced accordingly, the current path of tab 121 is reduced, thereby reducing internal resistance and improving the charge and discharge performance of battery cell 10.

[0164] According to some embodiments of this application, the second segment 1211 is in contact with the transition surface 131.

[0165] Please see Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the electrode lead-out component 13 and the electrode tab 121 in some embodiments of this application. Figure 9 This is a schematic diagram of the electrode lead-out component 13 and the tab 121 in other embodiments of this application.

[0166] In some embodiments, the second segment 1211 may partially contact the transition surface 131. In other embodiments, the second segment 1211 may be in contact with the transition surface 131 entirely.

[0167] Optionally, the length of the second segment 1211 is greater than the length of the transition surface 131, and the end of the second segment 1211 away from the first segment 1210 extends beyond the second edge 1311, so that the entire transition surface 131 can contact the second segment 1211. Alternatively, a portion of the transition surface 131 can contact the second segment 1211.

[0168] Optionally, the length of the second segment 1211 is less than the length of the transition surface 131, the end of the second segment 1211 away from the first segment 1210 does not extend beyond the second edge 1311, and the side of the second segment 1211 facing the transition surface 131 is in complete or partial contact with the transition surface 131.

[0169] Optionally, the length of the second segment 1211 is equal to the length of the transition surface 131, and the side of the second segment 1211 facing the transition surface 131 is in complete or partial contact with the transition surface 131.

[0170] Optionally, no connecting structure is provided between the second segment 1211 and the transition surface 131, and the two are in contact. For example, the pre-pressure applied during the assembly of the battery cell 10 makes the second segment 1211 and the transition surface 131 fit together.

[0171] Optionally, the parts in contact between the second segment 1211 and the transition surface 131 can be integrated by means of bonding, welding, riveting, threaded connection, etc.

[0172] In the above scheme, by setting the second segment 1211 to contact the transition surface 131, on the one hand, the transition surface 131 and the second segment 1211 can abut and support each other, thereby improving the impact resistance of the internal circuit structure of the battery cell 10, thus making the battery cell 10 have higher reliability, and thus making the battery device 100 have higher reliability; on the other hand, based on the electrical connection between the first segment 1210 and the first surface 130, by making the second segment 1211 contact the transition surface 131, the electrical connection area between the tab 121 and the electrode lead-out component 13 can be effectively increased, thereby improving the overcurrent capacity of the battery cell 10, making the battery cell 10 have higher charge and discharge performance, and thus making the battery device 100 have higher charge and discharge performance.

[0173] According to some embodiments of this application, the second segment 1211 is welded to the transition surface 131. Alternatively, an adhesive layer is provided between the second segment 1211 and the transition surface 131, and the second segment 1211 and the transition surface 131 are connected by the adhesive layer.

[0174] In some embodiments, the second segment 1211 is welded to the transition surface 131. Exemplarily, the second segment 1211 is welded to the transition surface 131 by ultrasonic welding or laser welding.

[0175] In other embodiments, an adhesive layer is provided between the second segment 1211 and the transition surface 131 to connect the two. For example, the adhesive layer may be a conductive adhesive.

[0176] In the above solution, by welding or bonding the second segment 1211 and the transition surface 131 into one unit, the impact resistance of the second segment 1211 and the electrode lead-out component 13 can be improved, and the risk of the second segment 1211 and the electrode lead-out component 13 being separated from each other due to impact can be reduced. This ensures the structural reliability of the internal circuit of the battery cell 10 to a certain extent, so that the battery cell 10 has high reliability, and thus the battery device 100 has high reliability.

[0177] According to some embodiments of this application, please refer to Figure 8 The transition surface 131 is a chamfered surface.

[0178] In some embodiments, the transition surface 131 being a chamfered surface can be understood as the transition surface 131 being a flat surface inclined to the first surface 130.

[0179] In some embodiments, the transition surface 131 can be formed on the electrode lead-out component 13 by a turning process. In other embodiments, the electrode lead-out component 13 is integrally formed, and the transition surface 131 is formed during the forming process.

[0180] In the above solution, by chamfering the end of the electrode lead-out component 13 facing the electrode assembly 12, the risk of the tab 121 being punctured and cracked by the sharp edge and corner of the electrode lead-out component 13 can be reduced, ensuring the structural integrity of the tab 121 to a certain extent and making the battery cell 10 have high reliability. On the other hand, the tab 121 can smoothly transition from the second section 1211 to the first section 1210, making the bending amplitude between the main body 120 and the tab 121 small, thereby improving the problem of the tab 121 cracking due to excessive bending, effectively improving the reliability of the battery cell 10, and thus effectively improving the reliability of the battery device 100.

[0181] According to some embodiments of this application, the included angle between the chamfered surface and the first surface 130 is α, which satisfies 110°≤α≤160°.

[0182] Please see Figure 8 The angle α between the chamfered surface and the first surface 130 can be 110°, 120°, 130°, 140°, 150°, 160° or any value between two adjacent values.

[0183] In the above solution, by limiting the angle α between the chamfered surface and the first surface 130 to be no less than 110° and no more than 160°, the second segment 1211 can be gently tilted relative to the first segment 1210, thereby reducing the risk of cracking between the first segment 1210 and the main body 120 due to excessive bending, so that the battery cell 10 has high reliability, and thus the battery device 100 has high reliability.

[0184] Optionally, in some other embodiments, the angle α between the chamfered surface and the first surface 130 can be other values, such as 95°, 96°, 97°, 98°, 99°, 100°, 101°, 102°, 103°, 104°, 105°, 106°, 107°, 108°, 109°, 161°, 162°, etc.

[0185] According to some embodiments of this application, please refer to Figure 9 The transition surface 131 is a rounded corner surface.

[0186] In some embodiments, the transition surface 131 being a rounded surface can be understood as the transition surface 131 being an arc surface.

[0187] In some embodiments, the transition surface 131 can be formed on the electrode lead-out component 13 by a turning process. In other embodiments, the electrode lead-out component 13 is integrally formed, and the transition surface 131 is formed during the forming process.

[0188] In the above solution, by rounding the end of the electrode lead-out component 13 facing the electrode assembly 12 to form a rounded surface, on the one hand, the risk of the tab 121 being punctured and cracked by the sharp edge and corner of the electrode lead-out component 13 can be effectively reduced, ensuring the structural integrity of the tab 121 to a certain extent, so that the battery cell 10 has high reliability. On the other hand, the tab 121 can be transitioned to the first section 1210 through the second section 1211 arc, so that the bending amplitude between the main body 120 and the tab 121 is small, thereby improving the problem of the tab 121 cracking due to excessive bending, effectively improving the reliability of the battery cell 10, and thus effectively improving the reliability of the battery device 100.

[0189] According to some embodiments of this application, the radius of the rounded corner is r, which satisfies 0.2mm≤r≤0.8mm.

[0190] Please see Figure 9 The radius r of the rounded corner can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm or any value between two adjacent values.

[0191] In the above solution, by limiting the radius r of the rounded corner surface to be no less than 0.2 mm and no more than 0.8 mm, the main body 120 and the first segment 1210 can be transitioned by an arc, which effectively reduces the risk of cracking between the first segment 1210 and the main body 120 due to excessively steep bending, so that the battery cell 10 has high reliability, and thus the battery device 100 has high reliability.

[0192] Optionally, in some other embodiments, the radius r of the rounded corner can be other values, such as 0.1 mm, 0.9 mm or other values.

[0193] According to some embodiments of this application, on the projection plane perpendicular to the thickness direction z of the first wall, the distance between the projection of the first edge 1310 and the projection of the second edge 1311 is B, which satisfies 0.5mm≤B≤3mm.

[0194] In some embodiments, the projection plane perpendicular to the thickness direction z of the first wall can be parallel to the horizontal plane, and B can refer to the distance between the first edge 1310 and the second edge 1311 in the horizontal direction.

[0195] Please see Figure 8 On the projection plane perpendicular to the thickness direction z of the first wall, the distance B between the projection of the first edge 1310 and the projection of the second edge 1311 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm...2.8mm, 2.9mm, 3mm or any value between two adjacent values.

[0196] In the above scheme, on the projection plane perpendicular to the thickness direction z of the first wall, by limiting the distance between the projection of the first edge 1310 and the projection of the second edge 1311 to be no less than 0.5 mm and no more than 3 mm, under the condition that the tab 121 can utilize the lateral space of the electrode lead-out component 13 to improve the volumetric energy density of the battery cell 10, the bending degree of the tab 121 can be appropriate, reducing the risk of the tab 121 cracking, thereby improving the reliability of the battery cell 10, and further improving the reliability of the battery device 100.

[0197] Optionally, in some other embodiments, the distance B between the projection of the first edge 1310 and the projection of the second edge 1311 on the projection plane perpendicular to the thickness direction z of the first wall can be other values, such as 0.4 mm, 3.1 mm or other values.

[0198] According to some embodiments of this application, please refer to Figures 6-9 Along the direction from the main body 120 to the first wall 111, the tab 121 extends beyond the second edge 1311.

[0199] In some embodiments, a portion of the tab 121 may extend beyond the second edge 1311 in the direction from the main body 120 to the first wall 111, that is, a portion of the tab 121 may extend beyond the transition surface 131, so as to utilize the space located between the transition surface 131 and the first wall 111.

[0200] Exemplarily, the tab 121 may include a root segment 1214, a corner segment 1213, a third segment 1212, a second segment 1211, and a first segment 1210. The root segment 1214 is connected to the main body 120 and protrudes toward the first wall 111. The corner segment 1213 connects the root segment 1214 and the third segment 1212. Along the thickness direction z of the first wall, there is a distance between the third segment 1212 and the main body 120. The end of the third segment 1212 away from the corner segment 1213 is connected to the second segment 1211, and the end of the second segment 1211 away from the third segment 1212 is connected to the first segment 1210. Along the direction from the main body 120 toward the first wall 111, the third segment 1212 is closer to the first wall 111 than the second segment 1211. The third segment 1212 extends entirely beyond the second edge 1311 of the transition surface 131, and a portion of the second segment 1211 extends beyond the second edge 1311.

[0201] In the above scheme, by setting the tab 121 to extend beyond the second edge 1311, the tab 121 can utilize the space between the second edge 1311 and the first wall 111, thereby enabling the provision of a larger main body 120, which in turn allows the battery cell 10 to have a larger electrochemical substance, thus enabling the battery cell 10 to have a higher volumetric energy density, and consequently enabling the battery device 100 to have a higher volumetric energy density.

[0202] According to some embodiments of this application, please refer to Figures 6-9 The tab 121 also includes a third segment 1212. The second segment 1211 connects the first segment 1210 and the third segment 1212, and extends along the main body 120 toward the first wall 111. The third segment 1212 extends beyond the first surface 130.

[0203] In some embodiments, the tab 121 further includes a third segment 1212, one end of which is connected to the second segment 1211, and the other end of which is directly or indirectly connected to the main body 120. For example, the other end of the third segment 1212 is connected to the main body 120 through a corner segment 1213 and a root segment 1214.

[0204] The phrase "the third segment 1212 extends beyond the first surface 130 along the direction from the main body 120 to the first wall 111" can be understood as the third segment 1212 being closer to the first wall 111 or further away from the main body 120 relative to the first segment 1210. For example, taking the direction from the first wall 111 to the main body 120 as the direction of gravity, the third segment 1212 is located above the first segment 1210, and the third segment 1212 smoothly transitions downwards to the first segment 1210 via its second end.

[0205] In the above scheme, the tab 121 has at least a three-segment structure, including at least a first segment 1210, a second segment 1211 and a third segment 1212. The third segment 1212 smoothly transitions to the first segment 1210 through the second segment 1211, which improves the risk of the tab 121 cracking due to excessive bending relative to the main body 120, thereby making the battery cell 10 have high reliability, and thus making the battery device 100 have high reliability.

[0206] According to some embodiments of this application, please refer to Figures 7-9 The electrode lead-out component 13 also includes a first outer peripheral surface 132 and a second surface 133. Along the thickness direction z of the first wall, the second surface 133 and the first surface 130 are opposite to each other, and the first outer peripheral surface 132 connects the transition surface 131 and the second surface 133.

[0207] In some embodiments, along the thickness direction z of the first wall, the electrode lead-out component 13 includes a first surface 130 and a second surface 133 opposite to each other. Optionally, the electrode lead-out component 13 is an electrode terminal 14, and the second surface 133 may be located outside the first wall 111 for connection to an external busbar component. Optionally, the electrode lead-out component 13 is an electrode terminal 14, and the second surface 133 is a surface facing the conductive element 16, and the second surface 133 may contact the first insulating element 17. Optionally, the electrode lead-out component 13 is an adapter 15, and the second surface 133 is a surface facing the electrode terminal 14, capable of contacting the electrode terminal 14.

[0208] The electrode lead-out component 13 also includes a first outer peripheral surface 132, which is located between the first surface 130 and the second surface 133. In some embodiments, along the thickness direction z of the first wall, the side of the first outer peripheral surface 132 opposite to the first surface 130 is connected to the edge of the second surface 133, and at least a portion of the other side of the first outer peripheral surface 132 may be connected to the second edge 1311 of the transition surface 131. Exemplarily, the other side of the first outer peripheral surface 132 is connected to the second edge 1311 of the transition surface 131; or, a portion of the other side of the first outer peripheral surface 132 is connected to the second edge 1311 of the transition surface 131, and the remaining portion is directly connected to the edge of the first surface 130.

[0209] In the above solution, by setting a transition surface 131 between the first outer peripheral surface 132 and the second surface 133, the risk of cracking due to excessively steep bending of the tab 121 can be reduced, thus enabling the battery cell 10 to have higher reliability. On the other hand, the difficulty of forming the transition surface 131 can be reduced, for example, by forming the transition surface 131 through chamfering or rounding processes, thereby improving the manufacturing efficiency and yield of the battery cell 10, and further improving the manufacturing efficiency and yield of the battery device 100.

[0210] According to some embodiments of this application, along the thickness direction z of the first wall, the distance between the first surface 130 and the second surface 133 is H, and the distance between the second surface 133 and the second edge 1311 is h, satisfying 0.2H≤h≤0.6H.

[0211] In some embodiments, along the thickness direction z of the first wall, the distance H between the first surface 130 and the second surface 133 can be the thickness of the electrode lead-out component 13, and the distance h between the second surface 133 and the second edge 1311 can be the thickness of the portion of the electrode lead-out component 13 that is locally thinned.

[0212] In some embodiments, the value of h can be 0.2H, 0.3H, 0.4H, 0.5H, 0.6H, or any value between two adjacent values.

[0213] For example, H is 5mm, and h can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, or any value between two adjacent values.

[0214] In the above scheme, the distance h between the second surface 133 and the second edge 1311 can be regarded as the thickness of the locally thinned area of ​​the electrode lead-out component 13. By making the distance h between the second surface 133 and the second edge 1311 not less than 0.2H, the forming difficulty of the transition surface 131 can be reduced, which is beneficial to the processing and forming efficiency of the electrode lead-out component 13, thereby improving the manufacturing efficiency and yield of the battery cell 10. By making the distance h between the second surface 133 and the second edge 1311 not greater than 0.6H, the transition surface 131 can have a longer transition path, which is beneficial to the tab 121 smoothly transitioning to the first section 1210 through the second section 1211. This can effectively improve the risk of the tab 121 cracking due to the transition of bending degree, making the battery cell 10 have higher reliability. In this regard, by limiting the distance h between the second surface 133 and the second edge 1311 to be no less than 0.2H and no more than 0.6H, the manufacturing efficiency, yield and reliability of the battery cell 10 can be balanced, and thus the manufacturing efficiency, yield and reliability of the battery device 100 can be balanced.

[0215] According to some embodiments of this application, please refer to Figure 4 and Figure 10 , Figure 10 This is a schematic diagram of the adapter 15 in some embodiments of this application. The battery cell 10 includes electrode terminals 14 and the adapter 15. The electrode terminals 14 are disposed on the first wall 111. The adapter 15 electrically connects the electrode terminals 14 and the tabs 121. The electrode lead-out component 13 is the adapter 15.

[0216] In some embodiments, the battery cell 10 includes an electrode terminal 14 and an adapter 15. The electrode terminal 14 is used to connect directly or indirectly to an external busbar component and is electrically connected to a tab 121 via the adapter 15. For example, the electrode terminal 14 passes through the outer side of the first wall 111, with a portion located on the outer side of the first wall 111 for direct welding to the busbar component, a portion located on the inner side of the first wall 111 and welded to a portion of the adapter 15, and another portion of the adapter 15 welded to the tab 121.

[0217] In some embodiments, the adapter 15 may be a collector plate or an adapter plate.

[0218] Optionally, in some embodiments of this application, the electrode lead-out component 13 described above can be an adapter 15, that is, the adapter 15 has a first surface 130 and a transition surface 131, the first surface 130 is electrically connected to the first segment 1210 of the tab 121, and the transition surface 131 is disposed opposite to the second segment 1211 of the tab 121.

[0219] Optionally, please see Figure 10 The adapter 15 includes a first portion 150 and a second portion 151 that are connected to each other. The first portion 150 is connected to the electrode terminal 14, and the second portion 151 is connected to the tab 121. The second portion 151 has a first surface 130 facing the main body 120 and a transition surface 131 that at least partially surrounds the first surface 130.

[0220] In the above scheme, the electrode terminal 14 is electrically connected to the tab 121 through the adapter 15, and the adapter 15 is provided with a transition surface 131. On the one hand, it can reduce the difficulty of electrically connecting the tab 121 and the electrode terminal 14, so that there is a large current flow area between the tab 121 and the electrode terminal 14, which is conducive to improving the charging and discharging performance of the battery cell 10. On the other hand, due to the provision of the transition surface 131, the tab 121 can smoothly transition from the second section 1211 to the first section 1210, effectively improving the risk of the tab 121 cracking due to the excessive bending degree, so that the battery cell 10 and the battery device 100 have high reliability.

[0221] According to some embodiments of this application, please refer to Figure 11 and Figure 12 , Figure 11 This is an exploded perspective view of a partial structure of the battery cell 10 in some embodiments of this application. Figure 12 This is a schematic diagram of electrode terminal 14 in some embodiments of this application.

[0222] The battery cell 10 includes an electrode terminal 14, which is disposed on the first wall 111. The electrode lead-out component 13 is the electrode terminal 14.

[0223] In some embodiments, the electrode lead-out component 13 described above can be an electrode terminal 14, which is mounted on the first wall 111 and directly connected to the tab 121. Exemplarily, the electrode terminal 14 is soldered to the tab 121.

[0224] Optionally, the electrode terminal 14 passes through the first wall 111, with the portion located outside the first wall 111 connected to the busbar component, and the portion located inside the first wall 111 connected to the tab 121.

[0225] Optionally, at least a portion of the electrode terminal 14 is located inside the first wall 111, and the battery cell 10 further includes a conductive element 16, at least a portion of which is located outside the first wall 111. The conductive element 16 is interconnected with the electrode terminal 14 to jointly clamp the first wall 111. The conductive element 16 is used to connect to an external busbar component, and the electrode terminal 14 is connected to the tab 121.

[0226] In the above scheme, the electrode terminal 14 is directly electrically connected to the tab 121, which simplifies the internal structure of the battery cell 10, allowing for the placement of more electrochemical substances. This effectively increases the volumetric energy density of the battery cell 10 and the battery device 100. Simultaneously, because the electrode terminal 14 has a transition surface 131, the tab 121 can smoothly transition from the second section 1211 to the first section 1210, effectively mitigating the risk of cracking due to excessive bending of the tab 121. This results in higher reliability for both the battery cell 10 and the battery device 100.

[0227] According to some embodiments of this application, please refer to Figure 11 The battery cell 10 also includes a conductive element 16, at least a portion of which is located outside the first wall 111 and is connected to the electrode terminal 14.

[0228] In some embodiments, the battery cell 10 includes a conductive element 16, and electrode terminals 14 are fixed to a first wall 111 via the conductive element 16. At least a portion of the electrode terminals 14 is disposed on the inner side of the first wall 111, and at least a portion of the conductive element 16 is disposed on the outer side of the first wall 111. The electrode terminals 14 and the conductive element 16 are interconnected to jointly clamp the first wall 111. The conductive element 16 is used to connect to an external busbar component, and the electrode terminals 14 are connected to tabs 121. The connection relationship between the electrode terminals 14 and the conductive element 16 includes, but is not limited to, welding, riveting, threaded connection, or other connection methods. Exemplarily, the conductive element 16 is generally plate-shaped, and the electrode terminals 14 include a terminal body 140 and a riveting post 141. The terminal body 140 is generally plate-shaped, and the conductive element 16 has a riveting hole. The riveting post 141 passes through the first wall 111 and is riveted into the riveting hole. In some embodiments, the conductive element 16 is made of a metallic material, such as aluminum, copper, iron, steel, alloy, or composite metal.

[0229] In some embodiments, a seal 19 is provided between the riveted post 141 and the first wall 111.

[0230] In the above scheme, the conductive element 16 is connected to the electrode terminal 14 and is at least partially disposed on the outside of the first wall 111 so as to facilitate connection with the external busbar component, thereby realizing the input or output of electrical energy of the battery cell 10.

[0231] According to some embodiments of this application, please refer to Figure 6 The battery cell 10 also includes a first insulating member 17, which is at least partially disposed between the first wall 111 and the electrode assembly 12, and the electrode terminal 14 passes through the first insulating member 17.

[0232] The first insulating member 17 is an insulating structure disposed between the first wall 111 and the electrode assembly 12. In some embodiments, the electrode terminal 14 passes through the first insulating member 17 to connect with the conductive member 16, or so that a portion of the electrode terminal 14 is located outside the first wall 111, thereby connecting with an external busbar.

[0233] In some embodiments, the first insulating member 17 may be the lower plastic of the battery cell 10.

[0234] In some embodiments, the first insulating element 17 can be made of a material with a high resistance value, such as an organic insulating material, an inorganic insulating material, or a mixed insulating material. Exemplarily, in some embodiments of this application, the material of the first insulating element 17 may include insulating PPS (polyphenylene sulfide) material. In other embodiments, the first insulating element 17 may also be made of other materials with insulating properties, such as polypropylene and polyethylene.

[0235] In the above solution, by setting a first insulating member 17 between the first wall 111 and the electrode assembly 12, the risk of internal short circuit caused by contact between the internal circuit structure of the battery cell 10 and the first wall 111 can be reduced. On the other hand, it can constrain the electrode assembly 12, reduce the risk of damage to the internal circuit structure of the battery cell 10 due to the movement of the electrode assembly 12, thereby making the battery cell 10 have high reliability, and thus making the battery device 100 highly reliable.

[0236] According to some embodiments of this application, please refer to Figure 6 The first insulating member 17 has a limiting portion 170 protruding on the side facing the electrode assembly 12. The limiting portion 170 is at least partially circumferentially disposed around the outer periphery of the electrode terminal 14 to limit the radial displacement of the electrode terminal 14.

[0237] The limiting part 170 is a part that protrudes from the first insulating member 17 on the side facing the main body part 120. The limiting part 170 can be a separate structure from the first insulating member 17, or it can be integrally formed with the first insulating member 17.

[0238] In some embodiments, the limiting portion 170 may be made of an insulating material.

[0239] Optionally, the limiting part 170 can be an annular structure and surround the outer circumference of the electrode terminal 14 to constrain the electrode terminal 14 in the circumferential direction.

[0240] Optionally, the limiting portion 170 is an intermittent structure surrounding the outer periphery of the electrode terminal 14. For example, the limiting portion 170 includes a plurality of sub-components, which are spaced apart around the outer periphery of the electrode terminal 14.

[0241] In some embodiments, the limiting portion 170 contacts the outer peripheral surface of the electrode terminal 14. In other embodiments, a gap exists between the limiting portion 170 and the outer peripheral surface of the electrode terminal 14.

[0242] The radial direction of electrode terminal 14 can be perpendicular to the axial direction of electrode terminal 14, and the axial direction of electrode terminal 14 can be parallel to the thickness direction z of the first wall.

[0243] In the above solution, by providing a limiting part 170 protruding on the inner side of the first insulating member 17, the electrode terminal 14 can be constrained and the radial displacement of the electrode terminal 14 can be limited. This reduces the risk of the electrode terminal 14 separating from the tab 121 or from the external busbar component, and to a certain extent ensures the reliability of the internal circuit structure or external circuit structure of the battery cell 10, thereby improving the reliability of the battery device 100.

[0244] According to some embodiments of this application, please refer to Figure 6 and Figure 7 Along the direction of the first wall 111 pointing towards the main body 120, the limiting part 170 does not extend beyond the second edge 1311.

[0245] In some embodiments, the limiting portion 170 does not extend beyond the second edge 1311, that is, in the radial direction of the electrode terminal 14, the projection of the transition surface 131 and the projection of the limiting portion 170 do not overlap.

[0246] Optionally, the third segment 1212 of the tab 121 is located above the second edge 1311 and abuts against the end of the limiting portion 170 opposite to the first wall 111.

[0247] Optionally, the third segment 1212 of the tab 121 is located above the second edge 1311 and there is a gap between it and the end of the limiting portion 170 that is opposite to the first wall 111.

[0248] In the above solution, by setting the limiting part 170 to not exceed the second edge 1311, the limiting part 170 reduces the space occupied by the limiting part 170 inside the battery cell 10 while constraining the electrode terminal 14, so that the battery cell 10 can accommodate more electrochemical substances, thereby improving the volumetric energy density of the battery cell 10 and further improving the volumetric energy sealing of the battery device 100.

[0249] According to some embodiments of this application, please refer to Figure 13 , Figure 13 This is a schematic diagram of a battery cell 10 in some embodiments of this application.

[0250] The outer casing 11 is a square outer casing 11.

[0251] The outer shell 11 has a dimension of T1 in the first direction x, a dimension of W1 in the second direction y, and a dimension of H1 in the thickness direction z of the first wall, satisfying: 3720cm 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, the first direction x, the second direction y and the thickness direction z of the first wall are mutually perpendicular.

[0252] The first direction x can be the thickness direction of the battery cell 10, the second direction y can be the width direction of the battery cell 10, and the thickness direction z of the first wall can be the height direction of the battery cell 10.

[0253] The statement “The outer casing 11 has a dimension of T1 in the first direction x, a dimension of W1 in the second direction y, and a dimension of H1 in the thickness direction z of the first wall” can be understood as the outer casing 11 of the battery cell 10 having a thickness of T1, a width of W1, and a height of H1.

[0254] In some embodiments, the thickness of the outer casing 11 is T1, the width is W1, and the height is H1, which can satisfy the following condition: 3720cm 3 ≤W1*T1*H1≤12500cm 3 , 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm.

[0255] For example, W1*T1*H1 is the value obtained by multiplying W1, T1, and H1, and W1*T1*H1 can take the value 3720cm. 3 Up to 12500cm 3 Any value between, and the two values.

[0256] For example, the value of T1 can be no less than 60mm and no more than 150mm. For example, the value of T1 can be 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm or any value between two adjacent values.

[0257] For example, the value of H1 can be no less than 120mm and no more than 400mm. For example, the value of T1 can be 120mm, 130mm, 140mm, 150mm, 160mm...360mm, 370mm, 380mm, 390mm, 400mm or any value between two adjacent values.

[0258] For example, the value of W1 can be no less than 200mm and no more than 1500mm. For example, the value of T1 can be 2000mm, 210mm, 220mm, 230mm, 240mm...1360mm, 1370mm, 1380mm, 1390mm, 1400mm or any value between two adjacent values.

[0259] In the above scheme, by limiting the external contour dimensions of the battery cell 10, the internal space of the battery cell 10 is made larger to accommodate more electrochemical substances, thereby forming a battery cell 10 with a larger capacity. For the battery cell 10 with a larger capacity, the electrode lead-out component 13 is designed to have a smooth transition surface 131, which facilitates the smooth bending of the tab 121, thereby reducing the risk of the tab 121 cracking. This allows the battery cell 10 with a larger capacity to be reliably charged and discharged, and thus the battery device 100 with such a battery cell 10 has high energy storage reliability or high discharge reliability.

[0260] Some embodiments of this application also provide a battery device 100, including the battery cell 10 provided above.

[0261] See Figure 2 As shown, the battery device 100 may also include a housing 20, in which the battery cells 10 are housed.

[0262] In some embodiments, the housing 20 may include a first housing body 21 and a second housing body 22, the first housing body 21 and the second housing body 22 covering each other, the first housing body 21 and the second housing body 22 together defining an assembly space for accommodating the battery cell 10.

[0263] Optionally, the second box body 22 can be a hollow structure with one end open, and the first box body 21 can be a plate-like structure. The first box body 21 covers the open side of the second box body 22 so that the first box body 21 and the second box body 22 together define the assembly space; the first box body 21 and the second box body 22 can also be hollow structures with one side open, and the open side of the first box body 21 covers the open side of the second box body 22.

[0264] Of course, the box 20 formed by the first box body 21 and the second box body 22 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 20 has a rectangular structure.

[0265] Optionally, the battery cell 10 disposed within the housing 20 can be one or more. For example, in... Figure 2In the battery device 100, multiple battery cells 10 are arranged inside the housing 20. The multiple battery cells 10 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 10 are connected in both series and parallel. The multiple battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 10 is housed in the housing 20. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 10 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 20.

[0266] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 10 to achieve electrical connection between the multiple battery cells 10.

[0267] It should be noted that in some embodiments, the battery device 100 may not have a housing 20. The battery device 100 includes multiple battery cells 10, and the battery device 100 composed of multiple battery cells 10 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 10. That is, the housing 20 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 20 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 20 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 20 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0268] Some embodiments of this application also provide an electrical device, which includes the battery cell 10 provided above and / or the battery device 100 provided above, wherein the battery cell 10 is used to provide electrical energy.

[0269] The electrical device can be any of the aforementioned applications of battery cell 10 and / or battery device 100. For example, the electrical device can be a vehicle 1000, which can be a range-extended vehicle, a pure electric vehicle, or a gasoline-powered vehicle. The electrical energy provided by the battery cell 10 can be used to meet the power needs of the vehicle 1000 during startup, navigation, and operation.

[0270] Some embodiments of this application also provide a battery cell 10, please refer to [link to relevant documentation]. Figures 3-12 .

[0271] The battery cell 10 includes a housing 11, an electrode assembly 12, and an electrode lead-out component 13. The housing 11 has a first wall 111. The electrode assembly 12 is disposed inside the housing 11, and the electrode assembly 12 includes a main body 120 and a tab 121, with the tab 121 disposed at one end of the main body 120 near the first wall 111.

[0272] The tab 121 may include a root segment 1214, a corner segment 1213, a third segment 1212, a second segment 1211, and a first segment 1210. The root segment 1214 is connected to the main body 120. The corner segment 1213 connects the root segment 1214 and the third segment 1212. Along the thickness direction z of the first wall, the third segment 1212 protrudes from the main body 120. The end of the third segment 1212 away from the corner segment 1213 is connected to the second segment 1211. The end of the second segment 1211 away from the third segment 1212 is connected to the first segment 1210. The first segment 1210 may be a freely suspended part of the tab 121.

[0273] In some embodiments, the electrode lead-out component 13 can be an electrode terminal 14, which is directly connected to the tab 121, for example, by soldering.

[0274] Taking electrode lead-out component 13 as an example of electrode terminal 14:

[0275] Optionally, the electrode terminal 14 passes through the first wall 111. The portion of the electrode terminal 14 located outside the first wall 111 is connected to the busbar component, while the portion of the electrode terminal 14 located inside the first wall 111 is chamfered or rounded, resulting in a locally thinned portion relative to the entire electrode terminal 14. The chamfered or rounded surfaces formed by the chamfered or rounded designs constitute a transition surface 131. The surface of the electrode terminal 14 facing the main body 120 is the first surface 130, and the transition surface 131 surrounds the edge of the first surface 130. The first segment 1210 of the tab 121 is connected to the first surface 130, for example, by welding. The second segment 1211 of the tab 121 is disposed opposite to the transition surface 131, and the two can be in contact with each other or spaced apart.

[0276] Optionally, see Figure 11 Electrode terminal 14 mates with conductive element 16 to be fixed to the first wall 111. Conductive element 16 is located on the outside of the first wall 111 and connected to the busbar component. A portion of electrode terminal 14 is located on the inside of the first wall 111, and another portion passes through the first wall 111 and is riveted to conductive element 16. The surface of electrode terminal 14 facing the main body 120 is the first surface 130, and transition surface 131 surrounds the edge of the first surface 130. The first segment 1210 of tab 121 is connected to the first surface 130, for example, by welding. The second segment 1211 of tab 121 is disposed opposite to transition surface 131, and the two can be in contact with each other or spaced apart.

[0277] In some embodiments, the electrode lead-out component 13 can be an adapter 15, and the electrode terminal 14 is connected to the electrode tab 121 through the adapter 15. For example, one end of the adapter 15 is welded to the electrode terminal 14, and the other end of the adapter 15 is welded to the electrode tab 121.

[0278] Taking the electrode lead-out component 13 as an example of the adapter 15:

[0279] The adapter 15 is located inside the first wall 111. The adapter 15 has a chamfered or rounded corner design on one side corresponding to the electrode terminal 14, making this portion locally thinner relative to the entire adapter 15. The chamfered or rounded corner surfaces formed by the chamfered or rounded corner design are transition surfaces 131. The surface of the adapter 15 facing the main body 120 is the first surface 130, and the transition surface 131 surrounds the edge of the first surface 130. The first segment 1210 of the tab 121 is connected to the first surface 130, for example, by welding. The second segment 1211 of the tab 121 is disposed opposite to the transition surface 131; the two can be in contact with each other or spaced apart.

[0280] In the battery cell 10 provided in some of the above embodiments, by providing a transition surface 131 with a gradually decreasing distance between the electrode lead-out component 13 and the first wall 111 at the end facing the electrode assembly 12, the electrode lead-out component 13 is locally thinned, and the tab 121 has a second segment 1211 disposed opposite to the transition surface 131, so that the tab 121 can smoothly transition to the first segment 1210 through the second segment 1211 and be electrically connected to the first surface 130 of the electrode lead-out component 13, thereby reducing the bending amplitude between the main body 120 and the tab 121 and improving the tab's performance. The problem of cracking due to excessively steep bending of tab 121, and the problem of damage to tab 121 structure caused by the sharp edges or corners of electrode lead-out component 13 acting on tab 121, can effectively improve the reliability of battery cell 10, and thus effectively improve the reliability of battery device 100. On the other hand, compared with the solution where electrode lead-out component 13 is not locally thinned, that is, no transition surface 131 is provided, the length of tab 121 can be reduced accordingly, the current path of tab 121 is reduced, thereby reducing internal resistance and improving the charge and discharge performance of battery cell 10.

[0281] The above are merely preferred embodiments of this application and are 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 outer shell has a first wall; An electrode assembly is disposed inside the housing. The electrode assembly includes a main body and a tab, with the tab disposed at one end of the main body near the first wall. An electrode lead-out component is connected to the electrode tab; The electrode lead-out component includes a first surface and a transition surface. Along the thickness direction of the first wall, the first surface faces the main body. The transition surface is at least partially circumferentially disposed around the outer periphery of the first surface. The transition surface has a first edge connected to the first surface and a second edge away from the first surface. Along the direction from the first edge to the second edge, the distance between the transition surface and the first wall gradually decreases. The electrode includes a first section and a second section, the first section being connected to the first surface, and the second section being disposed opposite to the transition surface.

2. The battery cell according to claim 1, characterized in that, The second segment is in contact with the transition surface.

3. The battery cell according to claim 1, characterized in that, The second segment is welded to the transition surface; or, an adhesive layer is provided between the second segment and the transition surface, and the second segment and the transition surface are connected through the adhesive layer.

4. The battery cell according to claim 1, characterized in that, The transition surface is a chamfered surface.

5. The battery cell according to claim 4, characterized in that, The angle between the chamfered surface and the first surface is α, which satisfies 110°≤α≤160°.

6. The battery cell according to claim 1, characterized in that, The transition surface is a rounded corner surface.

7. The battery cell according to claim 6, characterized in that, The radius of the rounded corner is r, which satisfies 0.2mm≤r≤0.8mm.

8. The battery cell according to claim 1, characterized in that, On the projection plane perpendicular to the thickness direction of the first wall, the distance between the projection of the first edge and the projection of the second edge is B, which satisfies 0.5mm≤B≤3mm.

9. The battery cell according to claim 1, characterized in that, Along the direction from the main body towards the first wall, the tab extends beyond the second edge.

10. The battery cell according to claim 1, characterized in that, The electrode also includes a third segment, the second segment connecting the first segment and the third segment, extending along the main body towards the first wall, and the third segment extending beyond the first surface.

11. The battery cell according to claim 1, characterized in that, The electrode lead-out component further includes a first outer peripheral surface and a second surface. Along the thickness direction of the first wall, the second surface and the first surface are opposite to each other, and the first outer peripheral surface connects the transition surface and the second surface.

12. The battery cell according to claim 11, characterized in that, Along the thickness direction of the first wall, the distance between the first surface and the second surface is H, and the distance between the second surface and the second edge is h, satisfying 0.2H≤h≤0.6H.

13. The battery cell according to any one of claims 1-12, characterized in that, The battery cell includes an electrode terminal and an adapter. The electrode terminal is disposed on the first wall, and the adapter electrically connects the electrode terminal and the tab. The electrode lead-out component is the adapter.

14. The battery cell according to any one of claims 1-12, characterized in that, The battery cell includes an electrode terminal, which is disposed on the first wall; wherein the electrode lead-out component is the electrode terminal.

15. The battery cell according to claim 14, characterized in that, The battery cell also includes a conductive element, at least a portion of which is located on the outside of the first wall and is connected to the electrode terminal.

16. The battery cell according to claim 14, characterized in that, The battery cell also includes a first insulating member, which is at least partially disposed between the first wall and the electrode assembly, and the electrode terminals pass through the first insulating member.

17. The battery cell according to claim 16, characterized in that, The first insulating member has a limiting portion protruding on the side facing the electrode assembly. The limiting portion is at least partially circumferentially disposed around the outer periphery of the electrode terminal to limit the radial displacement of the electrode terminal along the electrode terminal.

18. The battery cell according to claim 17, characterized in that, Along the direction from the first wall toward the main body, the limiting portion does not extend beyond the second edge.

19. The battery cell according to claim 1, characterized in that, The outer shell is a square shell. The dimension of the outer shell in the first direction is T1, the dimension in the second direction is W1, and the dimension in the thickness direction of the first wall is H1, satisfying 3720cm. 3 ≤W1*T1*H1≤12500cm 3 60mm≤T1≤150mm, 120mm≤H1≤400mm, 200mm≤W1≤1500mm, and the first direction, the second direction, and the thickness direction of the first wall are all perpendicular to each other.

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

21. An electrical appliance, characterized in that, Includes the battery cell according to any one of claims 1-19, and / or the battery device according to claim 20, wherein the battery cell is used to provide electrical energy.

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