Battery cells, battery packs and electrical devices

Abstract

This application relates to the field of battery technology, providing a battery cell, a battery device, and an electrical device. The battery cell includes an electrode assembly and electrode terminals. The electrode assembly includes an electrode sheet, which includes an insulating substrate and conductive layers disposed on both sides of the insulating substrate. The insulating substrate includes a second insulating portion, and the conductive layers include second conductive portions. The electrode assembly includes a plurality of sub-tabs, each sub-tab including a second insulating portion and second conductive portions disposed on both sides of the second insulating portion. Each sub-tab includes a first region electrically connected to the electrode terminals. In the first region, at least partially, two second conductive portions of the sub-tab are in contact. This reduces the resistance of the sub-tab in the first region, increases the current-carrying area of ​​the sub-tab in the first region, and thereby improves the current-carrying capacity of the sub-tab.

Description

Technical Field

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

[0002] From a market perspective, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing. Furthermore, battery capacity is becoming larger, and the performance requirements for battery devices are becoming increasingly stringent. A battery device includes a casing and the individual battery cells housed within it.

[0003] In related technologies, a battery cell typically includes a casing and an electrode assembly disposed within the casing. The electrode assembly is mainly formed by stacking and / or winding electrode sheets. The electrode sheets may include an insulating substrate and conductive layers disposed on both sides of the insulating substrate. A portion of the insulating substrate and a portion of the conductive layers of the electrode sheet can constitute a sub-tab, such that conductive layers are provided on both sides of the insulating substrate in the sub-tab. In the electrode assembly, multiple sub-tabs with the same polarity can be stacked to form a tab cluster.

[0004] Thus, the part of the tab cluster used for soldering to the electrode terminal or adapter structure has a high resistance, resulting in a high resistance at the connection between the tab cluster and the electrode terminal or adapter structure, which in turn makes the tab cluster have poor current carrying capacity.

[0005] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art. Utility Model Content

[0006] In view of the above problems, embodiments of this application provide a battery cell, a battery device, and an electrical device that can improve the technical problem of poor current carrying capacity of the tab cluster.

[0007] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0008] The outer casing is equipped with electrode terminals;

[0009] An electrode assembly, at least partially disposed within a housing; the electrode assembly includes an electrode sheet, the electrode sheet including an insulating substrate, conductive layers disposed on both sides of the insulating substrate, and an active material layer disposed on the side of the conductive layer opposite to the insulating substrate; the insulating substrate includes a first insulating portion and a second insulating portion extending from the first insulating portion; the conductive layer includes a first conductive portion and a second conductive portion extending from the first conductive portion; the first conductive portion is disposed on the first insulating portion, the second conductive portion is disposed on the second insulating portion; at least a portion of the first conductive portion is coated with the active material layer, and at least a portion of the second conductive portion is not coated with the active material layer; the electrode assembly includes a plurality of sub-electrode tabs stacked together, each sub-electrode tab including a second insulating portion and two second conductive portions respectively disposed on both sides of the second insulating portion;

[0010] The sub-tab includes a first region electrically connected to the electrode terminal, in which at least some of the two second conductive parts of the sub-tab are in contact.

[0011] The battery cell provided in this application embodiment achieves conduction by having at least partial contact between the two second conductive parts of the sub-tab in the first region, thereby removing at least a portion of the second insulating part in the first region. This allows the two second conductive parts of the sub-tab to contact each other in the first region, thus reducing the resistance of the sub-tab in the first region, increasing the current-carrying area of ​​the sub-tab in the first region, and thereby improving the current-carrying capacity of the sub-tab, thus improving the current-carrying capacity of the battery cell.

[0012] In some embodiments, in the first region, the two second conductive portions of the sub-electrode are partially in contact; or, in the first region, no second insulating portion is provided.

[0013] By adopting the above technical solutions, the overcurrent capacity of the sub-tab can be improved; and / or, the structural strength of the sub-tab can be improved, and the problems of sub-tab damage and breakage can be mitigated, thereby improving the electrical connection strength and fixing strength between the sub-tab and the terminal assembly.

[0014] In some embodiments, in a first region, the two second conductive portions of the sub-electrode are partially in contact; the sub-electrode also includes a second region, wherein the thickness of the second insulating portion in the first region is less than the thickness of the second insulating portion in the second region.

[0015] By reducing the thickness of the second insulating part in the first region to be less than that in the second region, the stress concentration problem at the junction of the contact area and the second insulating part in the first region (described below) can be improved, thereby reducing the problem of the sub-electrode being prone to damage and breakage in the first region.

[0016] In some embodiments, in the first region, the sub-tab is provided with a through hole, at least one conductive post is inserted into the through hole, two second conductive parts of the sub-tab are electrically connected through the conductive post, and at least one second conductive part of the sub-tab is welded to the conductive post.

[0017] The first region includes a contact region surrounding the conductive post. No second insulating part is provided in the contact region, and the two second conductive parts of the sub-pole tab are in contact in the contact region.

[0018] By welding the conductive post to the second conductive part in the first region, the heat generated during the welding process can be transferred to the second insulating part, causing the second insulating part to melt under the action of heat. This facilitates the removal of at least a portion of the second insulating part in the first region, thereby helping to reduce the resistance of the first region and increasing the current-carrying area of ​​the first region to improve the current-carrying capacity of the sub-tab.

[0019] In some embodiments, in the first region, the two second conductive portions of the sub-electrode are partially in contact;

[0020] In the first region, the contact area is located between the second insulating part and the conductive post.

[0021] With this configuration, the second conductive part in the first region is welded to the conductive post, which allows the heat generated by welding the conductive post to melt away the second insulating part in the contact region. This facilitates the contact between the two second conductive parts of the sub-tab in the contact region, thus improving the current-carrying area and current-carrying capacity of the sub-tab.

[0022] In some embodiments, in the first region, the two second conductive portions of the sub-electrode are partially in contact;

[0023] In the first region, in the direction from which the second insulating portion points to the conductive post, the thickness of at least a portion of the second insulating portion gradually decreases.

[0024] By gradually reducing the thickness of at least a portion of the second insulating portion in the direction of the second insulating portion pointing towards the conductive post in the first region, the stress in the sub-electrode tab in the first region can be reduced, thereby improving the problem of sub-electrode tab breakage and fracture caused by stress concentration in the first region of the sub-electrode tab.

[0025] In some embodiments, there are multiple conductive pillars, which are spaced apart; a contact area is provided between two adjacent conductive pillars.

[0026] This configuration ensures that the two second conductive parts of the sub-tab are in contact with each other to conduct electricity in at least a portion of the area between two adjacent conductive posts, thereby increasing the current-carrying area of ​​the sub-tab and improving its current-carrying capacity.

[0027] In some embodiments, in the first region, the two second conductive portions of the sub-electrode are partially in contact;

[0028] There are multiple conductive pillars, which are spaced apart.

[0029] A second insulating portion is provided between two adjacent conductive posts; or, the second insulating portion is provided around multiple conductive posts, and no second insulating portion is provided in the area between two adjacent conductive posts.

[0030] This configuration allows the second insulating part to be flexibly positioned around the conductive post.

[0031] In some embodiments, a second insulating portion is provided between two adjacent conductive posts;

[0032] The second insulating portion between two adjacent conductive posts includes a first portion and a second portion. The outer periphery of each of the two adjacent conductive posts is surrounded by the second portion. The first portion is provided between the second portions on the outer periphery of the two adjacent conductive posts. The thickness of the second portion is set to gradually decrease from the first portion toward the direction away from the first portion; or, the thickness of the second insulating portion gradually decreases along the direction of the second insulating portion toward each conductive post.

[0033] This configuration allows at least a portion of the thickness of the second insulating portion between two adjacent conductive posts to be smaller as it gets closer to the conductive post, which helps to reduce the stress on the sub-electrode in the first region, thereby improving the problem of breakage and fracture of the sub-electrode due to stress concentration.

[0034] In some embodiments, the sub-tab further includes a second region, and in the first region, a contact region is provided between the second region and the conductive post.

[0035] This configuration ensures that, in at least a portion of the area between the second region and the conductive post, the two second conductive parts of the sub-electrode are in contact with each other to conduct electricity, thereby increasing the current-carrying area of ​​the sub-electrode and improving its current-carrying capacity.

[0036] In some embodiments, the sub-tab further includes a second region, in which a second insulating portion is provided in the region between the second region and the conductive post in the first region, or no second insulating portion is provided.

[0037] This configuration allows for the flexible placement of a second insulating portion in the area between the second region and the conductive post.

[0038] In some embodiments, in the first region, the thickness of at least a portion of the second insulating portion in the region between the second region and the conductive post gradually decreases along the direction of the second insulating portion toward the conductive post.

[0039] This configuration allows the thickness of the second insulating portion between the second region and the conductive post to be smaller as it gets closer to the conductive post, which helps to reduce the stress on the sub-tab in the first region, thereby improving the problem of damage and breakage of the sub-tab N1 caused by stress concentration.

[0040] In some embodiments, in the first region, the two second conductive portions of the sub-electrode are partially in contact, and the thickness of the second insulating portion in the first region is less than 1 μm.

[0041] This configuration reduces the stress on the sub-electrode in the first region, thus mitigating the problem of damage and breakage caused by stress concentration on the sub-electrode.

[0042] In some embodiments, both second conductive portions in the sub-electrode are welded to conductive posts.

[0043] This configuration helps to improve the overcurrent capacity of the sub-tab.

[0044] In some embodiments, the electrode assembly includes a tab cluster, the tab cluster includes a plurality of sub-tabs stacked together, the tab cluster has a through hole, a plurality of second conductive parts in the tab cluster are electrically connected through conductive posts, and at least one second conductive part in the tab cluster is welded to a conductive post.

[0045] This configuration allows multiple second conductive parts in the tab cluster to be electrically connected through the conductive post 3, which helps to increase the current-carrying area of ​​the tab cluster, thereby improving the current-carrying capacity of the tab cluster.

[0046] In some embodiments, the battery cell further includes a terminal assembly and a retaining member, the terminal assembly including electrode terminals, and the tab cluster pressing against the terminal assembly and the retaining member along the axial direction of the through hole;

[0047] At least one conductive post includes a first conductive post disposed on the pressing member, inserted into the through hole, and welded to at least one second conductive part in the tab cluster.

[0048] By using at least one conductive post as the first conductive post disposed on the pressing member, the first conductive post can electrically connect multiple second conductive parts in the tab cluster. Therefore, during the processing of the battery cell, it is unnecessary to pre-weld the tab cluster, which reduces the number of processing steps, simplifies the battery cell processing operation, and lowers the processing cost. Furthermore, it can increase the energy density of the battery cell. By pressing the tab cluster axially between the terminal assembly and the pressing member, all sub-tabs of the tab cluster can be stably fixed, and the tab cluster and the terminal assembly can be made conductive.

[0049] In some embodiments, the tab cluster is pressed axially between the pressing member and the electrode terminal, and the first conductive post is welded to the electrode terminal;

[0050] Alternatively, the terminal assembly may also include an adapter structure, which is fixed and connected to the electrode terminals, with the tab cluster pressed axially between the pressing member and the adapter structure, and the first conductive post welded to the adapter structure.

[0051] By adopting the above technical solution, the first conductive post can be soldered to the terminal assembly.

[0052] In some embodiments, at least one conductive post further includes a second conductive post, which is disposed on the terminal assembly, inserted into the through hole, and soldered to at least one second conductive portion in the tab cluster;

[0053] The first conductive post and the second conductive post are axially aligned and welded together, or the first conductive post and the second conductive post are spaced apart in a direction perpendicular to the axial direction, and at least a portion of the first conductive post is axially aligned with the second conductive post in a direction perpendicular to the axial direction.

[0054] By adopting the above technical solution, the first conductive post and the second conductive post can be flexibly arranged.

[0055] In some embodiments, the battery cell further includes a terminal assembly, the terminal assembly including electrode terminals; at least one conductive post including a second conductive post, the second conductive post being disposed on the terminal assembly and inserted into a through hole, and welded to at least one second conductive portion in the tab cluster.

[0056] By using at least one conductive post as a second conductive post disposed on the terminal assembly, the second conductive post can weld multiple second conductive parts in the tab cluster to conduct electricity. Therefore, during the processing of the battery cell, it is unnecessary to pre-weld the tab cluster. This reduces the number of processing steps in the battery cell, simplifying the processing operation and lowering the processing cost. Furthermore, it can increase the energy density of the battery cell.

[0057] In some embodiments, the battery cell further includes a retaining member, with the tab cluster pressing against the terminal assembly and the retaining member along the axial direction of the through hole.

[0058] By pressing the tab cluster against the terminal assembly and the pressing member along the axial direction, on the one hand, the fixing reliability between the tab cluster and the terminal assembly can be improved; on the other hand, by pressing the second conductive part of the tab cluster against the pressing member on the other side of the tab cluster along the axial direction, the tab cluster and the terminal assembly can achieve stable conduction, which is beneficial to increasing the current carrying capacity between the tab cluster and the terminal assembly.

[0059] In some embodiments, the second conductive post is disposed on the electrode terminal;

[0060] Alternatively, the terminal assembly may also include an adapter structure that is fixed to and connected to the electrode terminals, with a second conductive post disposed on the adapter structure.

[0061] This configuration allows the second conductive post to be placed on the terminal assembly.

[0062] In some embodiments, the width of the first conductive part is greater than the width of the second conductive part, and the width direction of the first conductive part and the width direction of the second conductive part are both perpendicular to the distribution direction of the first conductive part and the second conductive part.

[0063] This design allows the sub-tabs to be die-cut during the cell manufacturing process.

[0064] Secondly, embodiments of this application provide a battery device, including a single battery cell.

[0065] The battery device provided in this application embodiment, by employing the battery cells mentioned above, can improve the overcurrent capacity of the battery cells, thereby improving the performance of the battery cells and thus improving the performance of the battery device.

[0066] Thirdly, embodiments of this application provide an electrical device, including a single battery cell or a battery device.

[0067] The electrical device provided in this application embodiment, by employing the battery cells or battery devices mentioned above, can improve the overcurrent capacity of the battery cells, thereby improving the performance of the battery cells and thus improving the performance of the electrical device.

[0068] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0069] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0070] Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application;

[0071] Figure 2 Exploded views of a battery device provided in some embodiments of this application;

[0072] Figure 3A three-dimensional structural diagram of a battery cell provided in some embodiments of this application;

[0073] Figure 4 for Figure 3 Sectional view along AA;

[0074] Figure 5 Partial cross-sectional views of the electrodes and conductive posts of a battery cell provided in some embodiments of this application;

[0075] Figure 6 Cross-sectional views of the tab clusters and conductive posts of a battery cell provided in some embodiments of this application;

[0076] Figure 7 A schematic diagram of the electrode assembly of a battery cell provided in some embodiments of this application;

[0077] Figure 8 A partial cross-sectional view of the tab cluster of a battery cell provided in some embodiments of this application;

[0078] Figure 9 for Figure 8 Enlarged view of point B in the middle;

[0079] Figure 10 A partial cross-sectional view of the tab cluster of a battery cell provided in other embodiments of this application;

[0080] Figure 11 for Figure 10 Enlarged view of point C in the middle;

[0081] Figure 12 A partial cross-sectional view of the tab cluster of a battery cell provided in some embodiments of this application;

[0082] Figure 13 for Figure 4 A partial schematic diagram;

[0083] Figure 14 for Figure 14 Partial schematic diagrams of the provided adapter structure, pressure member, and electrode assembly in some examples;

[0084] Figure 15 for Figure 14 Enlarged view at point E in the middle;

[0085] Figure 16 for Figure 14 A partial exploded view;

[0086] Figure 17 for Figure 13 Partial schematic diagrams of the provided adapter structure, pressure member, and electrode assembly in other examples;

[0087] Figure 18 for Figure 17 Enlarged view at point F;

[0088] Figure 19 for Figure 17 A partial exploded view;

[0089] Figure 20 A perspective view of the pressing member and the first conductive post of a battery cell provided in some embodiments of this application;

[0090] Figure 21 Partial cross-sectional views of a battery cell provided for other embodiments of this application;

[0091] Figure 22 for Figure 13 Partial schematic diagrams of the provided adapter structure, pressure member, and electrode assembly in some further examples;

[0092] Figure 23 for Figure 22 Enlarged view of point G in the middle;

[0093] Figure 24 for Figure 22 A partial exploded view;

[0094] Figure 25 A partial cross-sectional view of a battery cell provided for some embodiments of this application;

[0095] Figure 26 for Figure 25 A partial schematic diagram of the provided adapter structure, pressing component, and electrode assembly;

[0096] Figure 27 for Figure 26 Enlarged view of section H in the middle;

[0097] Figure 28 for Figure 26 A partial exploded view;

[0098] Figure 29 A partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0099] Figure 30 for Figure 14 Partial schematic diagrams of the provided adapter structure, pressure member, and electrode assembly in some further examples;

[0100] Figure 31 for Figure 30 Enlarged view of point I in the middle;

[0101] Figure 32 for Figure 30 A partial exploded view.

[0102] The following are the labeling elements in the figure:

[0103] 1000 - Vehicle; 200 - Controller; 300 - Motor; 100 - Battery Unit; 10 - Battery Cell; 1 - Electrode Assembly; 101 - Through Hole; 11 - Electrode Sheet; 111 - Insulating Substrate; 1111 - First Insulating Part; 1112 - Second Insulating Part; 11121 - First Part; 11122 - Second Part; 112 - Conductive Layer; 1121 - First Conductive Part; 1122 - Second Conductive Part; 113 - Active Material Layer; 2 - Shell; 12 1-Housing; 122-End cap; 3-Conductive post; 3a-First conductive post; 3b-Second conductive post; 4-Terminal assembly; 41-Electrode terminal; 42-Adapter structure; 5-Pressure member; 20-Box; 210-First part; 220-Second part; M-Main body; N-Electrode tab cluster; N1-Sub-electrode tab; N2-First region; N21-Contact region; N3-Second region; U-Axial direction; Z-First direction; X-Second direction; Y-Third direction. Detailed Implementation

[0104] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0105] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0106] Unless otherwise specified, all technical features and optional technical features of the embodiments of this application can be combined with each other to form new technical solutions.

[0107] In the description of the embodiments of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0108] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0109] In the description of the embodiments of this application, "multiple" means two or more, and unless otherwise explicitly specified, "two or more" includes two. Correspondingly, "multiple groups" means two or more groups, including two groups.

[0110] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0111] In the description of 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 three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0112] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms "proximity" and "adjacent" refer to proximity in location. For example, among three components A1, A2, and B, if the distance between A1 and B is greater than the distance between A2 and B, then A2 is closer to B than A1, meaning A2 is adjacent to B. Alternatively, B can be said to be adjacent to A2; in other words, A2 is adjacent to B. Similarly, when there are multiple components C, namely C1, C2, ... CN, if one component C, such as C2, is closer to component B than the other components C, then B is adjacent to C2; in other words, C2 is adjacent to B.

[0113] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0114] From a market perspective, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As the application areas of battery devices continue to expand, the market demand is also constantly increasing. Furthermore, the capacity of battery devices is becoming larger, and the performance requirements for battery devices are becoming increasingly stringent.

[0115] The battery device can be a power battery or an energy storage battery.

[0116] The battery device includes one or more battery cells, each battery cell including a housing and an electrode assembly disposed within the housing, the electrode assembly being mainly formed by stacking and / or winding of electrode sheets.

[0117] In related technologies, electrodes typically include an insulating substrate and conductive layers disposed on both sides of the insulating substrate. This allows the conductive layers to be made relatively thin due to the matrix effect of the insulating substrate. On the one hand, this reduces the amount of metal used, thereby reducing the weight of the electrode and increasing the energy density of the battery device. On the other hand, in the event of abnormal electrode pin insertion, the thinner conductive layer results in fewer metal burrs on the electrode, thus improving the problem of overlap between the positive and negative electrodes in cases of pin insertion abnormalities.

[0118] A portion of the insulating substrate and a portion of the conductive layer of the electrode sheet can form a sub-tab, such that conductive layers are provided on both sides of the insulating substrate in the sub-tab. In the electrode assembly, multiple sub-tabs of the same polarity can be stacked to form a tab cluster.

[0119] Due to the insulating properties of the insulating substrate, the resistance of the part of the tab cluster used for welding to the electrode terminal or transition structure is relatively high, resulting in a high resistance at the connection between the tab cluster and the electrode terminal or transition structure, thus making the tab cluster have poor current carrying capacity.

[0120] Based on the above considerations, embodiments of this application provide a battery cell, a battery device, and an electrical device. By having at least partial contact between the two second conductive parts of the sub-tab in a first region, at least a portion of the second insulating part in the first region is removed, thereby allowing the two second conductive parts in the sub-tab to contact each other in the first region to achieve conductivity. This reduces the resistance of the sub-tab in the first region, increases the current-carrying area of ​​the sub-tab in the first region, and thus improves the current-carrying capacity of the sub-tab, thereby improving the current-carrying capacity of the battery cell.

[0121] The battery cell involved in the embodiments of this application refers to the smallest unit used for storing and outputting electrical energy. The battery cell can be a secondary battery or a primary battery. A secondary battery is a battery cell that can be recharged after discharge to activate the active materials and continue to be used.

[0122] The battery cells can be cylindrical, flat, cuboid, or other shapes. Battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0123] The battery device involved in the embodiments of this application can be a single physical module comprising one or more battery cells, used to provide voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel, or in a mixed connection via a busbar. A mixed connection refers to multiple battery cells being connected in both series and parallel configurations.

[0124] In some embodiments, the battery device can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. As an example, multiple battery cells can be fixed to form a battery module by cable ties or the like. As an example, multiple battery cells can also be fixed to form a battery module by end plates, side plates, or the like.

[0125] In some embodiments, the battery device can be a battery pack, which may include a housing and individual battery cells. As an example, individual battery cells may be directly housed within the housing. As another example, multiple individual battery cells may first be assembled into one or more battery modules and then housed within the housing.

[0126] The battery cells and battery devices involved in the embodiments of this application can be used in energy storage devices that use battery cells or battery devices as energy storage elements.

[0127] The energy storage device involved in this application embodiment can be an energy storage container or an energy storage cabinet. The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output electrical energy when appropriate. For example, the energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical devices during peak hours. The energy storage device can include one or more battery clusters, and each battery cluster includes multiple battery devices. Multiple battery devices in a battery cluster can be connected in series through a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters can be connected in parallel to increase the capacity of the energy storage device.

[0128] The battery cell and battery device provided in this application embodiment can also be used in electrical devices that use the battery cell or battery device as a power source.

[0129] Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, vehicles, 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. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. Based on the power source, vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Based on the drive method, vehicles can be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0130] For ease of description, this application uses a vehicle as an example to illustrate the embodiments of the electrical device.

[0131] In some embodiments, please refer to Figure 1 , Figure 1 This is a schematic diagram of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0132] In some embodiments, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0133] In some embodiments, please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a housing 20 and a battery cell 10. The housing 20 is a structure with an internal space for accommodating the battery cell 10.

[0134] The housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first portion 210 and a second portion 220, which overlap each other and together define the internal space of the housing 20, which is a closed space. Here, "closed" means covered or shut off; it can be sealed or unsealed. That is, the housing 20 can be a sealed structure or an unsealed structure. See [link to relevant documentation] for details. Figure 2 Both the first part 210 and the second part 220 can be hollow structures with an opening at one end. The open side of the first part 210 covers the open side of the second part 220, so that the first part 210 and the second part 220 together define the internal space of the box 20. Alternatively, the first part 210 can be a hollow structure with an opening at one end, and the second part 220 is a plate-like structure. The second part 220 covers the open side of the first part 210, so that the first part 210 and the second part 220 together define the internal space of the box 20. The box 20 composed of the first part 210 and the second part 220 can be of various shapes, such as a cylinder, a cuboid, etc.

[0135] In some embodiments, multiple battery cells 10 can be connected in series, parallel, or mixed to form a whole, and then the whole formed by the multiple battery cells 10 is directly housed in the internal space of the housing 20. In other embodiments, multiple battery cells 10 can also be connected in series, parallel, or mixed to form a battery module, and the battery module is housed in the internal space of the housing 20. In still other embodiments, multiple battery cells 10 can also be connected in series, parallel, or mixed to form multiple battery modules, and the multiple battery modules can then be connected in series, parallel, or mixed to form a whole, and housed in the internal space of the housing 20.

[0136] In some embodiments, please combine Figure 1 and Figure 2 The housing 20 of the battery pack 100 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.

[0137] In some embodiments, please refer to the following: Figure 3 and Figure 4 And in conjunction with other accompanying figures. Figure 3 This is a perspective structural diagram of the battery cell 10 provided in some embodiments of this application. Figure 4 for Figure 3 Cross-sectional view along AA. The battery cell 10 provided in this application embodiment may include an electrode assembly 1 and a housing 2.

[0138] Electrode assembly 1 is the component in the battery cell 10 where the electrochemical reaction occurs. Electrode assembly 1 is mainly formed by winding or stacking positive and negative electrode sheets, with a separator between them. The portions of the positive and negative electrode sheets containing active material constitute the main body M of electrode assembly 1, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The tab of the positive electrode sheet is the positive tab, and the tab of the negative electrode sheet is the negative tab. For example... Figure 3 and Figure 4 As shown, the positive electrode tab and the negative electrode tab can be located together at one end of the main body M; or, the positive electrode tab and the negative electrode tab can be located at opposite ends of the main body M respectively.

[0139] In a single battery cell 10, the number of electrode components 1 can be one or more.

[0140] In some embodiments, the battery cell 10 may further include an electrolyte, which acts as a conductor of ions between the positive and negative electrode plates. The electrolyte described in this application embodiment may be liquid, gel-like, or solid.

[0141] The housing 2 is used to define the internal environment of the battery cell 10 and to house the electrode assembly 1 and the electrolyte.

[0142] In some embodiments, please refer to the following: Figure 3 and Figure 4 And in conjunction with other figures. The housing 2 may include a housing 21 and an end cap 22, which are components used to jointly define the internal environment of the battery cell 10. The internal environment defined by the housing 21 and the end cap 22 is used to accommodate the electrode assembly 1 and the electrolyte.

[0143] In some implementations, the housing 21 and the end cap 22 can be independent components. Specifically, the housing 21 has an opening, and the end cap 22 is placed over the opening of the housing 21 to jointly define the internal environment of the battery cell 10 and isolate the internal environment of the battery cell 10 from the external environment.

[0144] In other implementations, the housing 21 and end cap 22 can also be an integrated structure. Specifically, the end cap 22 and housing 21 can form a common connecting surface before the electrode assembly 1 is inserted into the housing. After the electrode assembly 1 is inserted into the housing, when it is necessary to encapsulate the electrode assembly 1, the end cap 22 is then used to close the housing 21. For example, when the battery cell 10 is a pouch battery, the housing 21 and end cap 22 of the battery cell 10 can be formed by punching a hole in the aluminum-plastic film. Then, the electrode assembly 1 is inserted into the internal environment formed by the punching hole in the aluminum-plastic film, and the opening of the aluminum-plastic film is fixed by sealing methods such as side sealing and top sealing. Of course, the battery cell 10 is not limited to a pouch battery, and the material of the housing 21 and end cap 22 is not limited to aluminum-plastic film.

[0145] The outer casing 2 can be either a sealed or unsealed structure. As an example, when the outer casing 2 is a sealed structure, it protects the electrode assembly 1 and, to some extent, prevents leakage such as electrolyte leakage. As an example, when the outer casing 2 is an unsealed structure, it still protects the electrode assembly 1, and a sealing bag may be included between the outer casing 2 and the electrode assembly 1 to encapsulate the electrode assembly 1 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating structure, an aluminum-plastic film, etc.

[0146] Among them, such as Figure 3 and Figure 4 As shown, there can be one end cap 22, which is located at one end of the housing 21. Alternatively, there can be two end caps 22, which are located at opposite ends of the housing 21.

[0147] The housing 21 can be cylindrical, square, or other shapes, depending on the specific shape and size of the electrode assembly. The housing 21 and end cap 22 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic.

[0148] Please refer to the following: Figures 3 to 12 And in conjunction with other accompanying figures. Figure 5 This is a partial cross-sectional view of the electrode 11 and conductive post 3 of the battery cell 10 provided in some embodiments of this application. Figure 6 This is a cross-sectional view of the tab cluster N and conductive post 3 of the battery cell 10 provided in some embodiments of this application. Figure 7 This is a schematic diagram of the electrode assembly 1 of a battery cell 10 provided in some embodiments of this application. Figure 8 This is a partial cross-sectional view of the tab cluster N of the battery cell 10 provided in some embodiments of this application. Figure 9 for Figure 8 Enlarged view at point B in the middle. Figure 10 This is a partial cross-sectional view of the tab cluster N of the battery cell 10 provided in other embodiments of this application. Figure 11 for Figure 10 Enlarged view of point C in the middle. Figures 8 to 11 In the diagram, the first region N2 and the second region N3 are separated by a dashed line. Figure 11 In the middle, the second insulating segment 11122 is divided into the first part 11121 and the second part 11122 by the dotted line. Figure 12 This is a partial cross-sectional view of the tab cluster of a battery cell provided in some embodiments of this application. The battery cell 10 provided in this application includes a housing 2 and an electrode assembly 1, with at least a portion of the electrode assembly 1 disposed within the housing 2. The housing 2 is provided with electrode terminals 41. The electrode assembly 1 includes an electrode sheet 11, which includes an insulating substrate 111, a conductive layer 112, and an active material layer 113. The conductive layer 112 is disposed on both sides of the insulating substrate 111, and the active material layer 113 is disposed on the side of the conductive layer 112 away from the insulating substrate 111. The insulating substrate 111 includes a first insulating portion 1111 and a second insulating portion 1112 extending from the first insulating portion 1111. The conductive layer 112 includes a first conductive portion 1121 and a second conductive portion 1122 extending from the first conductive portion 1121. The first conductive portion 1121 is disposed on the first insulating portion 1111, and the second conductive portion 1122 is disposed on the second insulating portion 1112. At least a portion of the first conductive portion 1121 is coated with an active material layer 113, while at least a portion of the second conductive portion 1122 is not coated with the active material layer 113. The electrode assembly 1 includes a plurality of stacked sub-tabs N1, each sub-tab N1 including a second insulating portion 1112 and two second conductive portions 1122. The two second conductive portions 1122 are respectively disposed on opposite sides of the second insulating portion 1112. The tab cluster N includes a first region N2 electrically connected to the electrode terminal 41, in which at least a portion of the two second conductive portions 1122 of the sub-tab N1 are in contact. The insulating substrate 111 refers to a substrate structure made of insulating material, and the first insulating portion 1111 and the second insulating portion 1112 are two parts of the insulating substrate 111. The conductive layer 112 refers to a metal layer with conductive properties, and the first conductive portion 1121 and the second conductive portion 1122 are two parts of the conductive layer 112.

[0149] Understandably, in the electrode 11, conductive layers 112 are provided on both opposite sides of the insulating substrate 111, such as... Figure 5 As shown, specifically, a first conductive part 1121 is provided on both opposite sides of the first insulating part 1111, and a second conductive part 1122 is provided on both opposite sides of the second insulating part 1112 in the sub-electrode N1.

[0150] Understandably, electrode assembly 1 includes a tab cluster N, which includes multiple sub-tabs N1 stacked together. That is, multiple sub-tabs N1 with the same polarity are stacked together to form the tab cluster N.

[0151] The electrode 11 can be either a positive or negative electrode. The sub-tab N1 can also be either a positive or negative electrode. Specifically, in the positive electrode, the sub-tab N1 formed by the second insulating portion 1112 and the second conductive portion 1122 on the second insulating portion 1112 is the positive electrode tab, and the tab cluster N formed by stacking multiple sub-tabs N1 is the positive electrode tab cluster N. In the negative electrode, the sub-tab N1 formed by the second insulating portion 1112 and the second conductive portion 1122 on the second insulating portion 1112 is the negative electrode tab, and the tab cluster N formed by stacking multiple sub-tabs N1 is the negative electrode tab cluster N. As an example, the conductive layer 112 of the positive electrode is an aluminum layer, and the conductive layer 112 of the negative electrode is a copper layer.

[0152] The active material layer 113 refers to the structural layer composed of active material. Understandably, the electrode 11 includes a composite current collector and an active material layer 113. The composite current collector includes an insulating substrate 111 and conductive layers 112 disposed on both sides of the insulating substrate 111.

[0153] Wherein, at least a portion of the first conductive portion 1121 is coated with an active material layer 113, meaning that on the surface of the first conductive portion 1121 away from the first insulating portion 1111, a portion of the area is coated with the active material layer 113 and another portion of the area is not coated with the active material layer 113; or, the entire surface of the first conductive portion 1121 away from the first insulating portion 1111 is coated with the active material layer 113.

[0154] Wherein, at least a portion of the second conductive portion 1122 is not coated with the active material layer 113 means that on the surface of the second conductive portion 1122 away from the second insulating portion 1112, a portion of the area is coated with the active material layer 113 and another portion of the area is not coated with the active material layer 113; or, the entire surface of the first conductive portion 1121 away from the first insulating portion 1111 is not coated with the active material layer 113.

[0155] As an example, when electrode 11 is a positive electrode, an insulating layer is disposed on the surface of the conductive layer 112 away from the insulating substrate 111. A portion of the insulating layer is disposed on the first conductive portion 1121, and another portion is disposed on the second conductive portion 1122; that is, the insulating layer is disposed at the junction of the first conductive portion 1121 and the second conductive portion 1122. Based on this, a portion of the first conductive portion 1121 is coated with an active material layer 113, while the other portion is not coated with an active material layer 113 but is instead provided with an insulating layer.

[0156] The first insulating part 1111, the first conductive part 1121 and the active material layer 113 of the positive electrode sheet, the first insulating part 1111, the first conductive part 1121 and the active material layer 113 of the negative electrode sheet, and the separator can constitute the main body M of the electrode assembly 1. The separator is mainly disposed between the active material layer 113 of the positive electrode sheet and the active material layer 113 of the negative electrode sheet.

[0157] Understandably, the battery cell 10 also includes a terminal assembly 4, which includes electrode terminals 41 disposed on the housing 2. The electrode terminal 41 is a component with conductive properties, serving as the current transmission terminal of the battery cell 10 for transmitting current. The electrode terminal 41 may be, but is not limited to, a pole piece.

[0158] Electrode terminal 41 is electrically connected to electrode assembly 1, specifically to sub-tab N1 of electrode assembly 1, and more specifically, electrode terminal 41 is electrically connected to the first region N2 of sub-tab N1. Electrode terminal 41 is electrically connected to the second conductive portion 1122 in the first region N2.

[0159] The electrode terminal 41 and the first region N2 of the sub-tab N1 can be directly electrically connected by means of welding, bonding, contact, etc.; or, the terminal assembly 4 also includes a transition structure 42 disposed in the housing 2. The transition structure 42 is disposed between the sub-tab N1 and the electrode terminal 41 to realize the transition between the electrode terminal 41 and the sub-tab N1 so as to enable current to pass through, thereby indirectly realizing the electrical connection between the sub-tab N1 and the electrode terminal 41.

[0160] The adapter structure 42 refers to a conductive metal structure, which may be, but is not limited to, a copper busbar. The adapter structure 42 and the electrode terminal 41 can be fixed and connected by means of welding, bolting, etc. The adapter structure 42 and the first region N2 of the sub-electrode N1 can be electrically connected by means of welding, bonding, contact, etc.

[0161] The first region N2 refers to the area of ​​the sub-tab N1 used for electrical connection to the electrode terminal 41. As an example, the first region N2 is soldered to the terminal assembly 4, and the first region N2 is the solder area formed by soldering the sub-tab N1, the terminal assembly 4, and the conductive post 3 described below.

[0162] The sub-tab N1 may further include a second region N3, which is connected to the first region N2. Since the first region N2 of the sub-tab N1 is welded to the terminal assembly 4, the first region N2 melts during the welding process, resulting in different colors and structural shapes for the first region N2 and the second region N3. For example, the first region N2 may be darker than the second region N3, or the second region N3 may have a smoother structure than the first region N2. Therefore, the first region N2 and the second region N3 can be distinguished by the structural shape or color of the sub-tab N1.

[0163] As an example, such as Figure 7 As shown, the second region N3 surrounds the outer perimeter of the first region N2.

[0164] In the first region N2, at least partial contact between the two second conductive portions 1122 of the sub-tab N1 means that in the first region N2, a second insulating portion 1112 is not provided between a portion of the two second conductive portions 1122 of the sub-tab N1, and this portion of the two second conductive portions 1122 of the sub-tab N1 is in contact with each other; a second insulating portion 1112 is provided between the other portion of the two second conductive portions 1122 of the sub-tab N1, and this other portion of the two second conductive portions 1122 of the sub-tab N1 is not in contact with each other; that is, a portion of the first region N2 does not have a second insulating portion 1112, while a portion of the first region has a second insulating portion 1112, such as... Figure 10 and Figure 11 As shown. Alternatively, the first region N2 may not have a second insulating portion 1112, allowing the two second conductive portions 1122 of the sub-electrode N1 to be in complete contact with each other in the first region N2, such as... Figure 8 and Figure 9 As shown.

[0165] The battery cell 10 provided in this application embodiment achieves conductivity by having at least partial contact between the two second conductive portions 1122 of the sub-tab N1 in the first region N2, thereby removing at least a portion of the second insulating portion 1112 in the first region N2. This allows the two second conductive portions 1122 of the sub-tab N1 to contact each other in the first region N2, thus reducing the resistance of the sub-tab N1 in the first region N2 and increasing the current-carrying area of ​​the sub-tab N1 in the first region N2, thereby improving the current-carrying capacity of the sub-tab N1. Therefore, the current-carrying area of ​​the tab cluster N in the first region N2 can be increased, the resistance of the tab cluster N in the first region N2 can be reduced, and the current-carrying capacity of the tab cluster N can be improved, thereby improving the current-carrying capacity of the battery cell 10.

[0166] In some embodiments, please refer to Figure 3In conjunction with other accompanying drawings, two electrode terminals 41 are provided, namely a positive electrode terminal and a negative electrode terminal. The positive electrode terminal is electrically connected to the positive electrode tab of the electrode assembly 1, and the negative electrode terminal is electrically connected to the negative electrode tab of the electrode assembly 1.

[0167] In some embodiments, please refer to Figure 3 And in conjunction with other accompanying drawings. Electrode terminals 41 are disposed on the housing 2. Specifically, electrode terminals 41 may be disposed on the housing 121 of the housing 2. For example... Figure 3 As shown, electrode terminals 41 can also be disposed on end caps 122 of housing 2.

[0168] The positive electrode terminal and the negative electrode terminal can be simultaneously disposed on the housing 121. Or, as... Figure 3 As shown, both the positive electrode terminal and the negative electrode terminal are disposed on the end cover 122. Alternatively, one of the positive electrode terminal and the negative electrode terminal may be disposed on the housing 121, and the other may be disposed on the end cover 122.

[0169] Among them, such as Figure 3 As shown, the positive electrode terminal and the negative electrode terminal can be located at the same end of the housing 2. Alternatively, the positive electrode terminal and the negative electrode terminal can be located at opposite ends of the housing 2.

[0170] In some embodiments, please refer to the following: Figure 8 and Figure 9 Furthermore, in conjunction with other accompanying drawings, the second insulating portion 1112 is not provided in the first region N2.

[0171] This configuration ensures that, in the first region N2, there is no second insulating portion 1112 between the two second conductive portions 1122 of the sub-tab N1, allowing the two second conductive portions 1122 of the sub-tab N1 to be in complete contact with each other. This increases the contact area of ​​the two second conductive portions 1122 of the sub-tab N1, thereby increasing the current-carrying area of ​​the sub-tab N1 and improving its current-carrying capacity, which in turn improves the current-carrying capacity of the battery cell 10.

[0172] In other embodiments, please refer to [the relevant documentation]. Figure 10 and Figure 11 And in conjunction with other accompanying drawings. In the first region N2, the two second conductive portions 1122 of the sub-electrode N1 are partially in contact.

[0173] Understandably, a portion of the first region N2 does not have a second insulating portion 1112. Specifically, in this portion of the first region N2, no second insulating portion 1112 is provided between the two second conductive portions 1122 of the sub-electrode N1. This allows the two second conductive portions 1122 of the sub-electrode N1 to contact each other in this portion of the first region N2, thus enabling the two second conductive portions 1122 of the sub-electrode N1 to conduct. Furthermore, another portion of the first region N2 has a second insulating portion 1112. Specifically, in this other portion of the first region N2, a second insulating portion 1112 is provided between the two second conductive portions of the sub-electrode N1, but they do not contact each other. That is, in the first region N2, a portion of the two second conductive portions 1122 of the sub-electrode N1 are in contact, while the other portion has a second insulating portion 1112 between them.

[0174] This configuration serves two purposes. First, it ensures that the two second conductive parts 1122 of the sub-tab N1 contact each other in a portion of the first region N2, thereby enabling the two second conductive parts 1122 of the sub-tab N1 to conduct and increasing the current-carrying area of ​​the sub-tab N1 to improve its current-carrying capacity. Second, in another portion of the first region N2, a second insulating part 1112 is provided between the two second conductive parts 1122 of the sub-tab N2. This second insulating part 1112 provides support for the second conductive parts 1122 in the other portion of the first region N2, thereby improving the structural strength of the sub-tab N1 in the first region N2. This addresses the problem of damage or breakage of the sub-tab N1 due to weak structural strength in the first region N2, and improves the electrical connection and fixing strength between the sub-tab N1 and the terminal assembly 4.

[0175] By adopting the above technical solution, the overcurrent capacity of the sub-tab N1 can be improved; and / or, the structural strength of the sub-tab N1 can be improved, and the problem of damage and breakage of the sub-tab N1 can be improved, thereby improving the electrical connection strength and fixing strength between the sub-tab N1 and the terminal assembly 4.

[0176] In some embodiments, please refer to the following: Figure 7 , Figure 10 and Figure 11 And in conjunction with other accompanying drawings. In the first region N2, the two second conductive portions 1122 of the sub-tab N1 are partially in contact. The sub-tab N1 also includes a second region N3, wherein the thickness of the second insulating portion 1112 in the first region N2 is less than the thickness of the second insulating portion 1112 in the second region N3.

[0177] By making the thickness of the second insulating portion 1112 in the first region N2 smaller than the thickness of the second insulating portion 1112 in the second region N3, the thickness of the second insulating portion 1112 in the first region N2 is reduced. This can improve the stress concentration problem at the junction of the contact region N21 and the second insulating portion 1112 in the first region N2, as discussed below, thereby improving the problem that the sub-electrode N1 is prone to damage and breakage in the first region N2.

[0178] In some embodiments, please refer to the following: Figure 5 , Figure 6 , Figures 8 to 20 And in conjunction with other accompanying figures. Figure 13 for Figure 4 A partial schematic diagram, Figure 14 for Figure 14 The provided adapter structure, pressure member, and electrode assembly are shown in partial schematic diagrams in some examples. Figure 15 for Figure 14 Enlarged view at point E in the middle. Figure 16 for Figure 14 A partial exploded view, Figure 17 for Figure 13 Partial schematic diagrams of the provided adapter structure, pressure member, and electrode assembly in other examples. Figure 18 for Figure 17 Enlarged view at point F in the middle. Figure 19 for Figure 17 A partial exploded view, Figure 20 This is a perspective view of the pressing member and the first conductive post of a battery cell provided in some embodiments of this application. In the first region N2, the sub-tab N1 is provided with a through hole 101, and at least one conductive post 3 is inserted into the through hole 101. The two second conductive parts 1122 of the sub-tab N1 are electrically connected through the conductive post 3, and at least one second conductive part 1122 of the sub-tab N1 is welded to the conductive post 3. The first region N2 includes a contact region N21, which is disposed around the conductive post 3. The contact region N21 does not have a second insulating part 1112, and the two second conductive parts 1122 of the sub-tab N1 are in contact in the contact region N21.

[0179] The through hole 101 refers to the hole formed by the through-hole N1. It can be understood that the through hole 101 extends along the axial direction U of the through hole 101 through both opposite sides of the through-hole N1 along the axial direction U. The direction of penetration of the through hole 101 is the axial direction U of the through hole 101.

[0180] The number of through holes 101 can be one or more. When there are multiple through holes 101, the multiple through holes 101 are spaced apart in a direction perpendicular to the axial direction U.

[0181] The conductive pillar 3 refers to a pillar structure with conductive properties. For example, the conductive pillar 3 can be a metal structure.

[0182] It should be further explained that the conductive post 3 is inserted into the through hole 101, which can be understood as the conductive post 3 being inserted into the sub-electrode tab N1 along the axial direction U.

[0183] The number of conductive posts 3 is one or more. The presence of at least one conductive post 3 within a through hole 101 means that one or more conductive posts 3 can be inserted into a single through hole 101.

[0184] When there are multiple through holes 101, each through hole 101 can be connected to a conductive post 3.

[0185] The two second conductive parts 1122 of the sub-tab N1 are electrically connected through a conductive post 3. Alternatively, the two second conductive parts 1122 of the sub-tab N1 can be electrically connected through a single conductive post 3. Figures 17 to 19 As shown; as an example, the conductive posts 3 are electrically connected to the two second conductive parts 1122 of the sub-tab N1, thereby indirectly realizing the electrical connection between the two second conductive parts 1122 of the sub-tab N1. Alternatively, the two second conductive parts 1122 of the sub-tab N1 can be electrically connected through the combined action of multiple conductive posts 3; as an example, two conductive posts 3 are inserted into the through hole 101, and of the two second conductive parts 1122 of the sub-tab N1 and the two conductive posts 3, one second conductive part 1122 is electrically connected to one conductive post 3, and the other second conductive part 1122 is electrically connected to the other conductive post 3, and the two conductive posts 3 are electrically connected, so that the two second conductive parts 1122 of the sub-tab N1 are electrically connected through the two conductive posts 3 in the through hole 101.

[0186] At least one of the two second conductive parts 1122 of the sub-tab N1 is welded to the conductive post 3, such that at least one of the two second conductive parts 1122 of the sub-tab N1 is electrically connected to the conductive post 3 by welding. Both second conductive parts 1122 of the sub-tab N1 can be welded to the conductive post 3 to be electrically connected to the conductive post 3 by welding; or, one of the two second conductive parts 1122 of the sub-tab N1 is welded to the conductive post 3 to be electrically connected to the conductive post 3 by welding, while the other second conductive part 1122 can be electrically connected to the conductive post 3 by contact or other means.

[0187] It should be further explained that by welding the conductive post 3 to the second conductive part 1122, the second conductive part 1122 can be stably electrically connected to the conductive post 3, thereby stably achieving electrical connection between two adjacent second conductive parts 1122.

[0188] Understandably, the conductive post 3 can be divided into a positive conductive post and a negative conductive post. The positive conductive post is inserted into the through hole 101 of the positive electrode tab N1 along the axial direction U, and is electrically connected to the second conductive part 1122 of the positive electrode tab N1. The negative conductive post is inserted into the through hole 101 of the negative electrode tab N1 along the axial direction U, and is welded to the second conductive part 1122 of the negative electrode tab N1.

[0189] As an example, in electrode assembly 1, the tab cluster N is bent relative to the main body M, such that the axial direction U of the through hole 101 is approximately the same as the first direction Z, that is, the conductive post 3 is inserted into the through hole 101 along the first direction Z. Here, the first direction Z is the approximate distribution direction of the first conductive part 1121 and the second conductive part 1122, the approximate distribution direction of the first insulating part 1111 and the second insulating part 1112, the approximate distribution direction of the tab cluster N and the main body M, and can also be the height direction of the battery cell 10.

[0190] Contact area N21 is the area within the first area N2 where the second insulating part 1112 is not provided. Specifically, when the second insulating part 1112 is not provided in the first area N2, as... Figure 8 and Figure 9 As shown, the first region N2 is the contact region N21; when the two second conductive parts 1122 of the sub-electrode N1 are partially in contact in the first region N2, the area in the first region N2 where the second insulating part 1112 is not provided is the contact region, and the area in the first region N2 where the second insulating part 1112 is provided is not the contact region.

[0191] The contact area N21 is arranged around the conductive post 3. Specifically, the contact area N21 can be arranged around the outer periphery of the conductive post 3, or the contact area N21 can be arranged around a portion of the outer periphery of the conductive post 3.

[0192] By welding the conductive post 3 to the second conductive part 1122 in the first region N2, the heat generated by the conductive post 3 during the welding process can be transferred to the second insulating part 1112, so that the second insulating part 1112 melts under the action of heat, thereby facilitating the removal of the second insulating part 1112 in the first region N2. This helps to make at least partial contact between the two second conductive parts 1122 of the sub-tab N1 in the first region N2, thereby increasing the current flow area of ​​the first region N2 and improving the current flow capacity of the sub-tab N1.

[0193] In other embodiments, at least a portion of the second insulating portion 1112 in the first region N2 can be removed by operations such as squeezing the first region N2.

[0194] The conductive post 3 is inserted into the through hole 101 of the sub-tab N1, and the two second conductive parts 1122 of the sub-tab N1 are electrically connected through the conductive post 3. At least one second conductive part 1122 of the sub-tab N1 is welded to the conductive post 3, so that the two second conductive parts 1122 of the sub-tab N1 can be stably electrically connected through the conductive post 3. In this way, during the processing of the battery cell 10, it is not necessary to perform a transfer welding operation on the tab cluster N in advance. On the one hand, this reduces the processing steps of the battery cell 10, thereby simplifying the processing operation of the battery cell 10 and reducing the processing cost of the battery cell 10. On the other hand, it eliminates the need for the metal foil used for the transfer welding operation and saves the height space occupied by the metal foil, thereby increasing the energy density of the battery cell 10.

[0195] It should be added that, such as Figure 8 and Figure 9 As shown, the first region N2 does not have a second insulating portion 1112. Specifically, in the region of the first region N2 located between the conductive post 3 and the second region N3, there is no second insulating portion 1112 between the two second conductive portions 1122 of the sub-electrode N1. Furthermore, when there are multiple conductive posts 3, and these multiple conductive posts 3 are spaced apart, in the region of the first region N2 located between two adjacent conductive posts 3, there is no second insulating portion 1112 between the two second conductive portions 1122 of the sub-electrode N1.

[0196] During the welding process of the conductive post 3, all the second insulating parts 1112 in the first region N2 can be completely melted under the action of heat, so that no second insulating parts 1112 are provided in the first region N2.

[0197] It should also be noted that, such as Figure 10 and Figure 11 As shown, in the first region N2, the two second conductive portions 1122 of the sub-electrode N1 are partially in contact, such that a second insulating portion 1112 is provided in a portion of the first region N2. Specifically, in the first region N2, the second insulating portion 1112 is disposed around the conductive post 3. Alternatively, in the first region N2, the second insulating portion 1112 may surround the outer periphery of the conductive post 3, or the second insulating portion 1112 may surround only a portion of the outer periphery of the conductive post 3.

[0198] In the first region N2, in the region between the conductive post 3 and the second region N3, a second insulating portion 1112 may be provided between the two second conductive portions 1122 of the sub-electrode N1. When there are multiple conductive posts 3 arranged at intervals, in the first region N2, in the region between two adjacent conductive posts 3, a second insulating portion 1112 may also be provided between the two second conductive portions 1122 of the sub-electrode N1.

[0199] In some embodiments, please refer to the following: Figure 10 and Figure 11 And in conjunction with other accompanying drawings. In the first region N2, the two second conductive portions 1122 of the sub-electrode N1 are partially in contact. In the first region N2, the contact region N21 is located between the second insulating portion 1112 and the conductive post 3.

[0200] In the first region N2, in the region between the conductive post 3 and the second region N3, when a second insulating part 1112 can be provided between the two second conductive parts 1122 of the sub-electrode N1, the contact region N21 is located between the second insulating part 1112 and the conductive post 3.

[0201] When there are multiple conductive posts 3, and these conductive posts 3 are spaced apart, in the first region N2, in the region between two adjacent conductive posts 3, a second insulating part 1112 may also be provided between the two second conductive parts 1122 of the sub-electrode N1, and the contact region N21 is located between the second insulating part 1112 and the conductive post 3.

[0202] With this configuration, by welding the second conductive part 1122 in the first region N2 with the conductive post 3, the second insulating part 1112 in the contact region N21 can be melted away by the heat generated by welding the conductive post 3. This facilitates the contact between the two second conductive parts 1122 of the sub-tab N1 in the contact region N21 to conduct electricity, which helps to increase the current-carrying area and current-carrying capacity of the sub-tab N1.

[0203] In some embodiments, please refer to the following: Figures 10 to 12 And in conjunction with other accompanying drawings. In the first region N2, the two second conductive portions 1122 of the sub-electrode N1 are partially in contact. In the first region N2, in the direction from which the second insulating portion 1112 points to the conductive post 3, the thickness of at least a portion of the second insulating portion 1112 gradually decreases.

[0204] Understandably, in the first region N2, the thickness of at least a portion of the second insulating portion 1112 is smaller as it gets closer to the conductive post 3.

[0205] In some possible designs, such as Figures 10 to 11 As shown, in the first region N2, in the region between the conductive post 3 and the second region N3, the thickness of at least a portion of the second insulating portion 1112 is smaller closer to the conductive post 3.

[0206] In some possible designs, such as Figures 10 to 12As shown, there are multiple conductive pillars 3, which are spaced apart. In the first region N2, in the region between two adjacent conductive pillars 3, the thickness of at least a portion of the second insulating portion 1112 is smaller as it gets closer to the conductive pillar 3.

[0207] Understandably, during the welding process of the conductive post 3, the heat generated by the second insulating part 1112 is greater as it gets closer to the conductive post 3, which results in the thickness of at least a portion of the second insulating part 1112 being smaller as it gets closer to the conductive post 3.

[0208] By gradually reducing the thickness of at least a portion of the second insulating portion 1112 in the direction pointing from the second insulating portion 1112 to the conductive post 3 in the first region N2, the stress on the sub-tab N1 in the first region N2 can be reduced, thereby improving the problem of stress concentration in the first region N2 of the sub-tab N1 causing the sub-tab N1 to break or fracture.

[0209] In some embodiments, please refer to the following: Figures 8 to 12 , Figure 20 And in conjunction with other accompanying drawings. There are multiple conductive posts 3, spaced apart. A contact area N21 is provided between two adjacent conductive posts 3.

[0210] Understandably, in at least a portion of the region between two adjacent conductive posts 3, the two second conductive portions 1122 of the sub-electrode N1 are in contact with each other. However, in the first region N2, the region between two adjacent conductive posts 3 may not have a second insulating portion 1112, such as... Figure 8 and Figure 9 As shown; or, in the first region N2, a second insulating portion 1112 may be provided in the region between two adjacent conductive posts 3, such as... Figures 1 to 12 As shown.

[0211] This arrangement ensures that the two second conductive parts 1122 of the sub-tab N1 are in contact with each other to conduct electricity in at least a portion of the region between two adjacent conductive posts 3, thereby increasing the current-carrying area of ​​the sub-tab N1 and improving its current-carrying capacity.

[0212] In some embodiments, please refer to the following: Figures 8 to 12 , Figure 20 And in conjunction with other accompanying drawings. In the first region N2, the two second conductive portions 1122 of the sub-electrode N1 are partially in contact. There are multiple conductive posts 3, which are spaced apart.

[0213] In some possible designs, such as Figures 10 to 12 As shown, a second insulating part 1112 is provided between two adjacent conductive posts 3.

[0214] Understandably, a second insulating portion 1112 is provided in the region between two adjacent conductive posts 3. Specifically, in the region between two adjacent conductive posts 3, a second insulating portion 1112 is provided between the two second conductive portions 1122 of the sub-electrode N1.

[0215] In the first region N2, a second insulating part 1112 may be provided in the region between the second region N3 and the conductive post 3, or the second insulating part 1112 may not be provided.

[0216] In some other possible designs, the second insulating portion 1112 is arranged around the plurality of conductive posts 3, and the second insulating portion 1112 is not provided in the area between two adjacent conductive posts 3.

[0217] Understandably, the second insulating portion 1112 is disposed around the plurality of conductive posts 3, so as to be disposed between the conductive posts 3 and the second region N3.

[0218] Specifically, in the region between two adjacent conductive posts 3, no second insulating part 1112 is provided between the two second conductive parts 1122 of the sub-electrode N1.

[0219] This configuration allows the second insulating part 1112 to be flexibly arranged around the conductive post 3.

[0220] In some embodiments, please refer to the following: Figures 10 to 12 Furthermore, in conjunction with other accompanying drawings, a second insulating portion 1112 is provided between two adjacent conductive posts 3.

[0221] In some possible designs, such as Figure 11 As shown, the second insulating portion 1112 located between two adjacent conductive posts 3 includes a first portion 11121 and a second portion 11122. The outer periphery of each conductive post 3 between two adjacent conductive posts 3 is surrounded by the second portion 11122. The first portion 11121 is provided between the second portions 11122 on the outer periphery of two adjacent conductive posts 3. The thickness of the second portion 11122 is set to gradually decrease from the first portion 11121 in the direction away from the first portion 11121.

[0222] As an example, such as Figure 11As shown, in a cross-section parallel to the axial direction U, the second insulating portion 1112 disposed between two adjacent conductive posts 3 may include a first portion 11121 and two second portions 11122. The two second portions 11122 are disposed along the distribution direction of the two adjacent conductive posts 3, and the first portion 11121 is disposed between the two second portions 11122 along the distribution direction of the two adjacent conductive posts 3. Specifically, the first second portion 11122 is closer to the first conductive post 3 than the first portion 11121, and the thickness of the first second portion 11122 gradually decreases along the direction closer to the first conductive post 3. The second second portion 11122 is closer to the second conductive post 3 than the first portion 11121, and the thickness of the second second portion 11122 gradually decreases along the direction closer to the second conductive post 3.

[0223] As an example, when multiple conductive posts 3 are arranged in an array, the shape of the first insulating segment 11121 can be approximately frustum-shaped or truncated cone-shaped.

[0224] In other possible designs, such as Figure 12 As shown, the thickness of the second insulating portion 1112 gradually decreases along the direction from the second insulating portion 1112 toward each conductive post 3.

[0225] As an example, in a cross-section parallel to the axial direction U, the second insulating portion 1112 disposed between two adjacent conductive posts 3 can be divided into two parts along the distribution direction of the two adjacent conductive posts 3. The first part is closer to the first conductive post 3 than the second part, and the thickness of the first part gradually decreases in the direction pointing towards the first conductive post 3. The second part is closer to the second conductive post 3 than the first part, and the thickness of this second part 11122 gradually decreases in the direction pointing towards the second conductive post 3.

[0226] As an example, when multiple conductive posts 3 are arranged in an array, the shape of the second insulating part 1112 can be approximately pyramidal or conical.

[0227] This configuration allows at least a portion of the thickness of the second insulating portion 1112 between two adjacent conductive posts 3 to be smaller as it gets closer to the conductive post 3, which helps to reduce the stress on the sub-electrode N1 in the first region N2, thereby improving the problem of breakage and fracture of the sub-electrode N1 due to stress concentration.

[0228] In some embodiments, please refer to the following: Figures 8 to 11 Furthermore, in conjunction with other accompanying drawings, the sub-tab N1 also includes a second region N3, and a contact region N21 is provided between the second region N3 and the conductive post 3 in the first region N2.

[0229] Understandably, in the region between the first region N2, the second region N3, and the conductive post 3, the two second conductive parts 1122 of the sub-electrode N1 are in contact with each other.

[0230] In the first region N2, a second insulating part 1112 may be provided in the region between the second region N3 and the conductive post 3, such as... Figure 10 and Figure 11 As shown; alternatively, the second insulating part 1112 may not be provided, such as Figure 8 and Figure 9 As shown.

[0231] This arrangement ensures that in at least a portion of the region between the second region N3 and the conductive post 3, the two second conductive portions 1122 of the sub-tab N1 are in contact with each other to conduct electricity, thereby increasing the current-carrying area of ​​the sub-tab N1 and improving its current-carrying capacity.

[0232] When the contact area N21 surrounds the outer periphery of the conductive post 3, the two second conductive parts 1122 of the sub-electrode N1 can contact each other in the first area N2, the area between the second area N3 and the conductive post 3, and the area between two adjacent conductive posts 3.

[0233] In some embodiments, please refer to the following: Figures 8 to 11 And in conjunction with other accompanying drawings. The sub-electrode N1 also includes a second region N3. In the first region N2, a second insulating portion 1112 is provided in the region between the second region N3 and the conductive post 3, such as... Figure 10 and Figure 11 As shown; or, in the region between the second region N3 and the conductive post 3 in the first region N2, the second insulating part 1112 is not provided, as shown. Figure 8 and Figure 9 As shown.

[0234] This configuration allows for the flexible placement of the second insulating portion 1112 in the area between the second region N3 and the conductive post 3.

[0235] In some embodiments, please refer to the following: Figure 10 and Figure 11 And in conjunction with other accompanying drawings. In the first region N2, at least a portion of the thickness of the second insulating portion 1112 in the region between the second region N3 and the conductive post 3 gradually decreases along the direction from the second insulating portion 1112 toward the conductive post 3.

[0236] Understandably, in the region between the second region N3 and the conductive post 3, the thickness of at least a portion of the second insulating portion 1112 is smaller closer to the conductive post 3.

[0237] This configuration allows the thickness of the second insulating portion 1112 between the second region N3 and the conductive post 3 to be smaller as it gets closer to the conductive post 3, which helps to reduce the stress on the sub-tab N1 in the first region N2, thereby improving the problem of damage and breakage of the sub-tab N1 caused by stress concentration.

[0238] The portion of the second insulating part 1112 that is away from the conductive post 3 can extend into the second insulating part 1112 in the second region N3.

[0239] The thickness of the second insulating portion 1112 can gradually decrease from the second region N3 toward the conductive post 3.

[0240] In some embodiments, in the first region N2, the two second conductive portions 1122 of the sub-electrode N1 are partially in contact. The thickness of the second insulating portion 1112 in the first region N2 is less than 1 μm.

[0241] The thickness of the second insulating portion 1112 is the dimension of the second insulating portion 1112 in its thickness direction.

[0242] The thickness of the second insulating part 1112 can be 0.1μm, 0.2μm, 0.3μm, 0.4μm, 0.5μm, 0.6μm, 0.7μm, 0.8μm, 0.9μm, etc.

[0243] This configuration can reduce the stress on the sub-tab N1 in the first region N2, thereby improving the problem of damage and breakage caused by stress concentration on the sub-tab N1.

[0244] It should be added that, Figure 4 , Figure 6 , Figures 8 to 19 , Figures 21 to 32 The cross-sections shown are all perpendicular to the second direction X, which is perpendicular to the first direction Z.

[0245] Among them, such as Figure 6 , Figures 8 to 14 , Figures 14 to 19 , Figures 21 to 24 , Figures 26 to 32 As shown, when there are multiple conductive pillars 3, in a cross-sectional view perpendicular to the second direction X, the multiple conductive pillars 3 are spaced apart along the third direction Y. Specifically, the first direction Z is perpendicular to the third direction Y, and the second direction X is perpendicular to the third direction Y.

[0246] As an example, such as Figure 3 As shown, the second direction X can be the width direction of the battery cell 10, and the third direction Y can be the thickness direction of the battery cell 10.

[0247] As an example, such as Figure 4As shown, when there are multiple electrode assemblies 1 in a single battery cell 10, the multiple electrode assemblies 1 can be arranged along a third direction Y.

[0248] In some embodiments, both second conductive portions 1122 of the sub-electrode N1 are welded to the conductive post 3.

[0249] This helps to improve the overcurrent capability of the sub-electrode N1.

[0250] In some embodiments, please refer to the following: Figures 13 to 19 And in conjunction with other accompanying drawings. Electrode assembly 1 includes tab cluster N, tab cluster N includes a plurality of sub-tabs N1 stacked together, tab cluster N is provided with the aforementioned through hole 101, a plurality of second conductive parts 1122 in tab cluster N are electrically connected through conductive posts, and at least one second conductive part 1122 in tab cluster N is welded to conductive post 3.

[0251] This configuration allows multiple second conductive parts 1122 in the tab cluster N to be electrically connected through the conductive post 3, which helps to increase the current-carrying area of ​​the tab cluster N, thereby improving the current-carrying capacity of the tab cluster N.

[0252] The plurality of second conductive portions 1122 in the tab cluster N may include two second conductive portions 1122 of the sub-tab N1, or may include the second conductive portions 1122 of the sub-tab N1.

[0253] In some embodiments, please refer to the following: Figure 3 , Figure 4 , Figures 13 to 21 And in conjunction with other accompanying figures. Figure 21 This is a partial cross-sectional view of a battery cell provided in some other embodiments of this application. The battery cell 10 also includes a terminal assembly 4 and a retaining member 5. The terminal assembly 4 includes electrode terminals 41 disposed on the housing 2, and a cluster of electrode tabs N is pressed against the terminal assembly 4 and the retaining member 5 along the axial direction U.

[0254] The pressing component 5 refers to the component used to limit the electrode tab cluster N together with the terminal assembly 4.

[0255] The tab cluster N is pressed against the terminal assembly 4 and the pressing member 5 along the axial direction U. This means that at least a portion of the terminal assembly 4 and the pressing member 5 are spaced apart along the axial direction U, and the tab cluster N is disposed between the terminal assembly 4 and the pressing member 5 along the axial direction U. The opposite sides of the tab cluster N along the axial direction U press against the terminal assembly 4 and the pressing member 5 respectively, so that the tab cluster N is limited to being located between the terminal assembly 4 and the pressing member 5 along the axial direction U. Specifically, the second conductive portion 1122 of one side of the tab cluster N, the sub-tab N1, presses against the terminal assembly 4 along the axial direction U, and the second conductive portion 1122 of the other side of the tab cluster N, the sub-tab N1, presses against the pressing member 5.

[0256] The second conductive portion 1122 of one side tab N1 of the tab cluster N along the axial direction U is pressed against the terminal assembly 4, so that the terminal assembly 4 and the tab cluster N are connected.

[0257] In this configuration, the tab cluster N presses against the terminal assembly 4 and the pressing member 5 along the axial direction U. Alternatively, the tab cluster N can press against the electrode terminal 41 and the pressing member 5 along the axial direction U. Figure 21 As shown; alternatively, the tab cluster N can be pressed against the transition structure 42 and the pressing member 5 along the axial direction U, as shown. Figures 13 to 19 As shown.

[0258] By pressing the tab cluster N against the terminal assembly 4 and the pressing member 5 along the axial direction U, on the one hand, the fixing reliability between the tab cluster N and the terminal assembly 4 can be improved; on the other hand, by pressing the second conductive part 1122 of the sub-tab N1 on the other side of the tab cluster N along the axial direction U against the pressing member 5, the tab cluster N and the terminal assembly 4 can achieve stable conduction, which is beneficial to increase the current carrying capacity between the tab cluster N and the terminal assembly 4.

[0259] In some embodiments, please refer to the following: Figures 14 to 21 And in conjunction with other accompanying drawings. At least one conductive post 3 includes a first conductive post 3a, which is disposed on the pressing member 5. In the first region N2, the first conductive post 3a is inserted into the through hole 101 and welded to at least one second conductive part 1122 in the tab cluster N.

[0260] Understandably, at least one conductive post 3 is a first conductive post 3a, and the description of the conductive post 3 in the above embodiments can be a description of the first conductive post 3a.

[0261] Understandably, the first conductive post 3a is disposed on the side of the pressing member 5 facing the terminal assembly 4 along the axial direction U, and is inserted into the through hole 101 of the tab cluster N along the axial direction U towards the terminal assembly 4.

[0262] The first conductive post 3a can be installed on the pressure member 5 by means of integral molding, welding or other methods.

[0263] By using at least one conductive post 3 as the first conductive post 3a disposed on the pressing member 5, the first conductive post 3a can electrically connect the multiple second conductive parts 1122 in the tab cluster N. Therefore, during the processing of the battery cell 10, it is not necessary to perform a pre-welding operation on the tab cluster N. This reduces the processing steps of the battery cell 10, thereby simplifying the processing operation and lowering the processing cost. Furthermore, it can improve the energy density of the battery cell 10. By pressing the tab cluster N against the terminal assembly 4 and the pressing member 5 along the axial direction U, all the sub-tabs N1 of the tab cluster N can be stably fixed, and the tab cluster N and the terminal assembly 4 can be made conductive.

[0264] In some embodiments, please refer to Figure 21 And in conjunction with other accompanying drawings. The tab cluster N is pressed against the pressing member 5 and the electrode terminal 41 along the axial direction U. In the first region N2, the first conductive post 3a is welded to the electrode terminal 41.

[0265] Understandably, no transition structure 42 is provided between electrode assembly 1 and tab cluster N.

[0266] The tab cluster N is pressed against the electrode terminal 41 and the pressing member 5 along the axial direction U. This means that at least a portion of the electrode terminal 41 and the pressing member 5 are spaced apart along the axial direction U, and the tab cluster N is disposed between the electrode terminal 41 and the pressing member 5 along the axial direction U, with opposite sides of the tab cluster N pressing against the electrode terminal 41 and the pressing member 5 respectively. Specifically, the second conductive portion 1122 of one side of the tab cluster N, a sub-tab N1, presses against the electrode terminal 41 along the axial direction U, and the second conductive portion 1122 of the other side of the tab cluster N, a sub-tab N1, presses against the pressing member 5, so that the tab cluster N is limited to being located between the electrode terminal 41 and the pressing member 5 along the axial direction U. Furthermore, by the second conductive portion 1122 of one side of the tab cluster N, a sub-tab N1, pressing against the electrode terminal 41 along the axial direction U, the electrode terminal 41 and the tab cluster N are made conductive.

[0267] The first region N2 is the solder area formed by welding the tab cluster N, the electrode terminal 41 and the conductive post 3.

[0268] Based on this, on the one hand, the relative position of the electrode terminal 41 and the pressing member 5 can be fixed by the first conductive post 3a, and the tab cluster N can be reliably limited between the electrode terminal 41 and the pressing member 5 along the axial direction U. This improves the closing reliability between all the sub-tabs N1 in the tab cluster N, and also improves the fixing reliability between the tab cluster N and the electrode terminal 41, which is also conducive to improving the conductivity reliability between the tab cluster N and the electrode terminal 41. On the other hand, the current on the electrode terminal 41 can be directly conducted to the multiple second conductive parts 1122 in the tab cluster N through the first conductive post 3a, thereby shortening the current path between the electrode terminal 41 and the tab cluster N, which is conducive to improving the current carrying capacity between the electrode terminal 41 and the tab cluster N.

[0269] During the processing of the battery cell 10, the first conductive post 3a can be inserted into the tab cluster N along the axial direction U, so that the first conductive post 3a penetrates the tab cluster N along the axial direction U. Then, energizing is applied between the pressing member 5 and the electrode terminal 41, so that the current can be conducted sequentially between the electrode terminal 41, the first conductive post 3a, and the pressing member 5. In this way, the first conductive post 3a can heat up and melt under energizing conditions. The melted first conductive post 3a is then welded to each of the second conductive parts 1122 in the electrode terminal 41 and the tab cluster N. In this way, during the welding operation of the first conductive post 3a, welding and fixing between the first conductive post 3a and multiple second conductive parts 1122 in the tab cluster N, and between the first conductive post 3a and the electrode terminal 41 can be achieved simultaneously, thereby realizing welding and fixing between multiple second conductive parts 1122 in the tab cluster N and between the tab cluster N and the electrode terminal 41, thus eliminating the need for a transfer welding process.

[0270] In some embodiments, please refer to the following: Figures 13 to 19 And in conjunction with other accompanying drawings. Terminal assembly 4 also includes a transition structure 42, which is fixed and conductive to electrode terminal 41, and electrode tab cluster N is pressed against the pressing member 5 and transition structure 42 along the axial direction U. In the first region N2, the first conductive post 3a is welded to transition structure 42.

[0271] The adapter structure 42 and the electrode terminal 41 can be fixed and connected by welding, bonding, riveting or other methods.

[0272] The tab cluster N is pressed against the transition structure 42 and the pressing member 5 along the axial direction U. This means that at least a portion of the transition structure 42 and the pressing member 5 are spaced apart along the axial direction U, the tab cluster N is disposed between the transition structure 42 and the pressing member 5 along the axial direction U, and opposite sides of the tab cluster N press against the transition structure 42 and the pressing member 5 respectively. Specifically, the second conductive portion 1122 of one side of the tab cluster N's ​​sub-tab N1 along the axial direction U presses against the transition structure 42, and the second conductive portion 1122 of the other side of the tab cluster N's ​​sub-tab N1 along the axial direction U presses against the pressing member 5, so that the tab cluster N is limited to being located between the transition structure 42 and the pressing member 5 along the axial direction U. Furthermore, the second conductive portion 1122 of one side of the tab cluster N's ​​sub-tab N1 along the axial direction U presses against the transition structure 42, making the transition structure 42 and the tab cluster N conductive.

[0273] Based on this, on the one hand, the relative positions of the adapter structure 42 and the pressing member 5 can be fixed by the first conductive post 3a, and the tab cluster N can be reliably limited between the adapter structure 42 and the pressing member 5 along the axial direction U. This improves the closing reliability between all the sub-tabs N1 in the tab cluster N, as well as the fixing reliability between the tab cluster N and the adapter structure 42, and also helps to improve the conduction reliability between the tab cluster N and the adapter structure 42. On the other hand, the current on the electrode terminal 41 can be sequentially conducted to the multiple second conductive parts 1122 of the tab cluster N through the adapter structure 42 and the first conductive post 3a, thereby shortening the current path between the electrode terminal 41 and the tab cluster N and improving the current carrying capacity between the electrode terminal 41 and the tab cluster N.

[0274] During the processing of the battery cell 10, the first conductive post 3a can be inserted into the tab cluster N along the axial direction U, so that the first conductive post 3a penetrates the tab cluster N along the axial direction U. Then, energize the pressing member 5 and the transition structure 42 so that the current can be conducted sequentially between the transition structure 42, the first conductive post 3a, and the pressing member 5. In this way, the first conductive post 3a can heat up and melt when energized. The melted first conductive post 3a is then welded to each of the second conductive parts 1122 in the tab cluster N and the transition structure 42. Then, the transition structure 42 and the electrode terminal 41 are fixed and connected. In this way, during the welding operation of the first conductive post 3a, the welding operations between the first conductive post 3a and multiple second conductive parts 1122 of the tab cluster N, and between the first conductive post 3a and the transition structure 42 can be realized simultaneously, thereby realizing the welding and fixing between multiple second conductive parts 1122 in the tab cluster N and between the tab cluster N and the transition structure 42, thus eliminating the need for a transfer welding process.

[0275] By adopting the above technical solution, the first conductive post 3a can be welded to the terminal assembly 4.

[0276] In some embodiments, please refer to the following: Figures 14 to 16 , Figures 22 to 32 And in conjunction with other accompanying figures. Figure 22 for Figure 13 Partial schematic diagrams of the provided adapter structure 42, pressing member 5, and electrode assembly 1 in some further examples. Figure 23 for Figure 22 Enlarged view at point G in the middle. Figure 24 for Figure 22 A partial exploded view, Figure 25 This is a partial cross-sectional view of a battery cell 10 provided in some embodiments of this application. Figure 26 for Figure 25 A partial schematic diagram of the provided adapter structure 42, pressing member 5, and electrode assembly 1. Figure 27 for Figure 26 Enlarged view of point H in the middle. Figure 28 for Figure 26 A partial exploded view, Figure 29 This is a partial cross-sectional view of a battery cell 10 provided in some embodiments of this application. Figure 30 for Figure 14 Partial schematic diagrams of the provided adapter structure 42, pressing member 5, and electrode assembly 1 in some further examples. Figure 31 for Figure 30 Enlarged view at point I in the middle. Figure 32 for Figure 30 A partial exploded view. At least one conductive post 3 further includes a second conductive post 3b, which is disposed on the terminal assembly 4. In the first region N2, the second conductive post 3b is inserted into the through hole 101 and soldered to at least one second conductive portion 1122 in the tab cluster N.

[0277] Understandably, at least one conductive post 3 is a second conductive post 3b, and the description of the conductive post 3 in the above embodiments can be a description of the second conductive post 3b.

[0278] Understandably, the second conductive post 3b is disposed on the side of the terminal assembly 4 facing the tab cluster N along the axial direction U. In the first region N2, the second conductive post 3b is inserted into the tab cluster N along the axial direction U, specifically into a plurality of second conductive parts 1122 in the tab cluster N, and the second conductive post 3b is welded to at least one second conductive part 1122 in the tab cluster N.

[0279] The second conductive post 3b can be installed on the terminal assembly 4 by means of integral molding, welding, or other methods.

[0280] By using at least one conductive post 3 as a second conductive post 3b disposed on the terminal assembly 4, the second conductive post 3b can weld and connect multiple second conductive portions 1122 in the tab cluster N. Therefore, during the processing of the battery cell 10, it is unnecessary to perform a pre-welding operation on the tab cluster N. This reduces the number of processing steps for the battery cell 10, simplifying the processing operation and lowering the processing cost. Furthermore, it can increase the energy density of the battery cell 10. In addition, the current on the terminal assembly 4 can be directly conducted to the second conductive portions 1122 of the tab cluster N through the second conductive post 3b, thus shortening the current path between the terminal assembly 4 and the tab cluster N and improving current carrying capacity.

[0281] In some embodiments, please refer to the following: Figures 14 to 16 Furthermore, in conjunction with other accompanying drawings, the first conductive post 3a and the second conductive post 3b are aligned axially U and welded together.

[0282] Understandably, the first conductive post 3a and the second conductive post 3b together penetrate the tab cluster N along the axial direction U. The first conductive post 3a is inserted into one part of the second conductive portion 1122 in the tab cluster N along the axial direction U and is electrically connected to that part of the second conductive portion 1122 in the tab cluster N; the second conductive post 3b is inserted into another part of the second conductive portion 1122 in the tab cluster N along the axial direction U and is electrically connected to that other part of the second conductive portion 1122 in the tab cluster N.

[0283] By welding the first conductive post 3a and the second conductive post 3b, on the one hand, the terminal assembly 4 and the pressing member 5 are fixed together through the first conductive post 3a and the second conductive post 3b, so that the tab cluster N can be reliably limited between the terminal assembly 4 and the pressing member 5. This improves the fixation reliability and conduction reliability between the tab cluster N and the terminal assembly 4, and between the multiple second conductive parts 1122 of the tab cluster N. On the other hand, the multiple second conductive parts 1122 of the tab cluster N are connected through the first conductive post 3a and the second conductive post 3b. The current on the terminal assembly 4 can be conducted to each second conductive part 1122 of the tab cluster N through the first conductive post 3a and the second conductive post 3b, thereby shortening the current path between the terminal assembly 4 and the tab cluster N and improving the current carrying capacity.

[0284] Based on this, during the processing of the battery cell 10, the first conductive post 3a can be inserted into the tab cluster N along the axial direction U, and the second conductive post 3b can be inserted into the tab cluster N along the axial direction U, with the first conductive post 3a and the second conductive post 3b arranged facing each other along the axial direction U. Then, energize the terminal assembly 4 and the pressing member 5, so that the current can be conducted sequentially between the terminal assembly 4, the second conductive post 3b, the first conductive post 3a, and the pressing member 5. In this way, both the first conductive post 3a and the second conductive post 3b can heat up and melt when energized, thereby welding the corresponding second conductive part 1122, and the first conductive post 3a and the second conductive post 3b are welded.

[0285] In other embodiments, please refer to [the relevant documentation]. Figures 22 to 24 And in conjunction with other accompanying drawings. The first conductive post 3a and the second conductive post 3b are spaced apart along a direction perpendicular to the axial direction U, and at least a portion of the first conductive post 3a and the second conductive post 3b are directly opposite each other along a direction perpendicular to the axial direction U.

[0286] As an example, the direction perpendicular to the axis U can be the third direction Y. On a section perpendicular to the second direction X, such as... Figures 22 to 24 As shown, the first conductive post 3a and the second conductive post 3b are spaced apart along the third direction Y, and at least a portion of the first conductive post 3a is directly opposite the second conductive post 3b along the third direction Y.

[0287] Understandably, the first conductive post 3a is inserted along the axial direction U into at least a portion of the second conductive portion 1122 in the tab cluster N, and is soldered to the at least a portion of the second conductive portion 1122 in the tab cluster N; the second conductive post 3b is inserted along the axial direction U into at least a portion of the second conductive portion 1122 in the tab cluster N, and is electrically connected to the at least a portion of the second conductive portion 1122 in the tab cluster N; and the at least a portion of the second conductive portion 1122 of the tab cluster N is inserted with the first conductive post 3a and the second conductive post 3b, that is, the at least a portion of the tab cluster N inserted with the first conductive post 3a and the at least a portion of the tab cluster N inserted with the second conductive post 3b coincide.

[0288] This configuration allows the multiple second conductive portions 1122 in the tab cluster N to conduct electricity through the combined action of the first conductive post 3a and the second conductive post 3b. This enables the current on the terminal assembly 4 to be conducted through the first conductive post 3a and the second conductive post 3b to the multiple second conductive portions 1122 in the tab cluster N. Furthermore, it improves the fixation reliability and conduction reliability between the multiple second conductive portions 1122 in the tab cluster N, and between the tab cluster N and the terminal assembly 4. In addition, by arranging the first conductive post 3a and the second conductive post 3b at intervals in a direction perpendicular to the axial direction U, the current-carrying area of ​​the tab cluster N is increased, thereby enhancing the current-carrying capacity of the tab cluster N.

[0289] By adopting the above technical solution, the first conductive post 3a and the second conductive post 3b can be flexibly arranged.

[0290] In some embodiments, please refer to the following: Figures 25 to 29 And in conjunction with other accompanying drawings. The battery cell 10 does not include the pressing member 5. The second conductive post 3b is inserted into each of the second conductive portions 1122 in the tab cluster N along the axial direction U, and is welded to each of the second conductive portions 1122 in the tab cluster N.

[0291] Based on this, during the processing of the battery cell 10, the second conductive post 3b can be first inserted into the tab cluster N along the axial direction U, so that the second conductive post 3b penetrates the tab cluster N along the axial direction U. A separable base is arranged on the side of the tab cluster N away from the terminal assembly 4 along the axial direction U, so that the tab cluster N presses against the terminal assembly 4 and the base along the axial direction U. Then, electricity is applied between the base and the terminal assembly 4, allowing current to be conducted sequentially between the terminal assembly 4, the second conductive post 3b, and the base. In this way, the second conductive post 3b can heat up and melt under energization. The molten second conductive post 3b is then welded to multiple second conductive parts 1122 in the tab cluster N. Finally, the base is separated from the tab cluster N. With this configuration, the base can replace the pressing member 5 and is removed from the tab cluster N after the welding operation. This reduces the number of components inside the casing 2 of the battery cell 10, thereby improving the energy density of the battery cell 10.

[0292] In some embodiments, please refer to Figure 29 Furthermore, in conjunction with other accompanying drawings, the second conductive post 3b is disposed on the electrode terminal 41.

[0293] Specifically, the terminal assembly 4 does not include the adapter structure 42. The tab cluster N is pressed against the electrode terminal 41 on one side along the axial direction U. The second conductive post 3b is disposed on the side of the electrode terminal 41 facing the tab cluster N along the axial direction U, and is inserted into the tab cluster N along the axial direction U, and is soldered to at least one second conductive part 1122 in the tab cluster N.

[0294] The second conductive post 3b can be installed on the electrode terminal 41 by means of integral molding, welding, bonding, bolt fixing, etc.

[0295] In some embodiments, please refer to the following: Figures 30 to 32 Furthermore, in conjunction with other accompanying drawings, the second conductive post 3b is disposed on the transition structure 42.

[0296] Specifically, the tab cluster N presses against the adapter structure 42 on one side along the axial direction U, and the second conductive post 3b is disposed on the side of the adapter structure 42 facing the tab cluster N along the axial direction U, inserted into the tab cluster N, and welded to at least one second conductive part 1122 in the tab cluster N.

[0297] The second conductive post 3b can be installed on the adapter structure 42 by means of integral molding, welding, bonding, bolt fixing, etc.

[0298] This configuration allows the second conductive post 3b to be mounted on the terminal assembly 4.

[0299] In some embodiments, the width of the first conductive portion 1121 is greater than the width of the second conductive portion 1122. The width direction of both the first conductive portion 1121 and the second conductive portion 1122 is perpendicular to the distribution direction of the first conductive portion 1121 and the second conductive portion 1122.

[0300] It can also be understood that the width direction of the first conductive part 1121 and the width direction of the second conductive part 1122 are both perpendicular to the thickness direction of the conductive layer 112.

[0301] This configuration ensures that the sub-tab N1 is a tab formed by die-cutting during the processing of the battery cell 10.

[0302] Please see Figure 2 The battery device 100 provided in this application embodiment includes a battery cell 10. The battery cell 10 in this embodiment is the same as the battery cell 10 in the above embodiments; please refer to the relevant descriptions of the battery cell 10 in the above embodiments for details, which will not be repeated here.

[0303] The battery device 100 provided in this application embodiment, by employing the battery cells 10 involved in the above embodiments, can improve the overcurrent capacity of the battery cells 10, thereby improving the performance of the battery cells 10 and thus improving the performance of the battery device 100.

[0304] Please see Figure 1 The electrical device provided in this application embodiment includes a battery cell 10 or a battery device 100. The battery cell 10 and battery device 100 in this embodiment are the same as those in the above embodiments; please refer to the relevant descriptions of the battery cell 10 and battery device 100 in the above embodiments for details, which will not be repeated here.

[0305] The electrical device provided in this application embodiment, by employing the battery cell 10 or battery device 100 mentioned above, can improve the overcurrent capacity of the battery cell 10, thereby improving the performance of the battery cell 10 and thus improving the performance of the electrical device.

[0306] As one embodiment of this application, such as Figures 3 to 6 , Figure 10 and Figure 11As shown, the battery cell 10 includes a housing 2, electrode terminals 41, an electrode assembly 1, and conductive posts 3. The electrode assembly 1 and conductive posts 3 are both disposed within the housing 2, and the electrode terminals 41 are disposed on the housing 2. The electrode assembly 1 includes an electrode sheet 11, which includes an insulating substrate 111 and conductive layers 112 disposed on opposite sides of the insulating substrate 111. The insulating substrate 111 includes a first insulating portion 1111 and a second insulating portion 1112 extending from the first insulating portion 1111. The conductive layer 112 includes a first conductive portion 1121 and a second conductive portion 1122 extending from the first conductive portion 1121. The first conductive portion 1121 is disposed on opposite sides of the first insulating portion 1111, and the second conductive portion 1122 is disposed on opposite sides of the second insulating portion 1112. At least a portion of the first conductive portion 1121 is coated with an active material layer 113, and at least a portion of the second conductive portion 1122 is not coated with the active material layer 113. Electrode assembly 1 includes a tab cluster N, which includes a plurality of sub-tabs N1 stacked together. Each sub-tab N1 includes a second insulating portion 1112 and two second conductive portions 1122 respectively disposed on both sides of the second insulating portion 1112. Each sub-tab N1 includes a first region N2 and a second region N3. The first region N2 is electrically connected to an electrode terminal 41 and is a soldering area. The second region N3 is disposed on the outer periphery of the first region N2. In the first region N2, the two second conductive portions 1122 of the sub-tab N1 are in partial contact. The sub-tab N1 has a through hole 101, into which at least one conductive post 3 is inserted and soldered to at least one second conductive portion 1122. The first region N2 includes a contact region N21 surrounding the outer periphery of the conductive post 3. In the contact region N21, the two second conductive portions 1122 of the sub-tab N1 are in contact with each other. In the first region N2, the second insulating portion 1112 surrounds the outer periphery of the conductive post 3. In the first region N2, the contact region N2 is located between the second insulating part 1112 and the conductive post 3.

[0307] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements 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 by, include: The outer casing is equipped with electrode terminals; An electrode assembly, at least partially disposed within the housing; the electrode assembly includes an electrode sheet, the electrode sheet including an insulating substrate, conductive layers disposed on both sides of the insulating substrate, and an active material layer disposed on the side of the conductive layer opposite to the insulating substrate; the insulating substrate includes a first insulating portion and a second insulating portion extending from the first insulating portion; the conductive layer includes a first conductive portion and a second conductive portion extending from the first conductive portion; the first conductive portion is disposed on the first insulating portion, the second conductive portion is disposed on the second insulating portion; at least a portion of the first conductive portion is coated with the active material layer, and at least a portion of the second conductive portion is not coated with the active material layer; the electrode assembly includes a plurality of sub-electrode tabs stacked together, each sub-electrode tab including a second insulating portion and two second conductive portions respectively disposed on both sides of the second insulating portion; The sub-tab includes a first region electrically connected to the electrode terminal, in which at least some of the two second conductive portions of the sub-tab are in contact.

2. The battery cell of claim 1, wherein, In the first region, the two second conductive portions of the sub-electrode are in partial contact; or, the second insulating portion is not provided in the first region.

3. The battery cell of claim 1, wherein, In the first region, the two second conductive portions of the sub-electrode are in partial contact; the sub-electrode also includes a second region, wherein the thickness of the second insulating portion in the first region is less than the thickness of the second insulating portion in the second region.

4. The battery cell according to any one of claims 1 to 3, characterized in that, In the first region, the sub-electrode is provided with a through hole, and at least one conductive post is inserted into the through hole. Two second conductive parts in the sub-electrode are electrically connected through the conductive post, and at least one second conductive part in the sub-electrode is welded to the conductive post. The first region includes a contact region surrounding the conductive post, the contact region not having a second insulating portion, and the two second conductive portions of the sub-pole tab contacting each other in the contact region.

5. The battery cell of claim 4, wherein, In the first region, the two second conductive portions of the sub-electrode are in partial contact; In the first region, the contact area is located between the second insulating portion and the conductive post.

6. The battery cell according to claim 4 or 5, characterized in that In the first region, the two second conductive portions of the sub-electrode are in partial contact; In the first region, in the direction from which the second insulating portion points to the conductive post, at least a portion of the thickness of the second insulating portion gradually decreases.

7. The battery cell of any one of claims 4-6, wherein, The number of conductive pillars is multiple, and the multiple conductive pillars are arranged at intervals; a contact area is provided between two adjacent conductive pillars.

8. The battery cell of any one of claims 4-7, wherein, In the first region, the two second conductive portions of the sub-electrode are in partial contact; The number of conductive pillars is multiple, and the multiple conductive pillars are arranged at intervals; The second insulating portion is provided between two adjacent conductive posts; or, the second insulating portion is provided around a plurality of conductive posts, and no second insulating portion is provided in the region between two adjacent conductive posts.

9. The battery cell of claim 8, wherein, The second insulating portion is provided between two adjacent conductive posts; The second insulating portion between two adjacent conductive posts includes a first portion and a second portion. The outer periphery of each of the two adjacent conductive posts is surrounded by the second portion. The first portion is provided between the second portions on the outer periphery of the two adjacent conductive posts. The thickness of the second portion is set to gradually decrease from the first portion toward the direction away from the first portion; or, the thickness of the second insulating portion gradually decreases along the direction of the second insulating portion toward each conductive post.

10. The battery cell of any one of claims 4-9, wherein, The sub-electrode also includes a second region, and in the first region, the contact region is provided between the second region and the conductive post.

11. The battery cell of any one of claims 4-10, wherein, The sub-electrode also includes a second region, in which the second insulating portion is provided in the region between the second region and the conductive post in the first region, or the second insulating portion is not provided.

12. The battery cell of claim 11, wherein, In the first region, the thickness of at least a portion of the second insulating portion in the region between the second region and the conductive post gradually decreases along the direction of the second insulating portion toward the conductive post.

13. The battery cell of any one of claims 4-12, wherein, In the first region, the two second conductive portions of the sub-electrode are partially in contact, and the thickness of the second insulating portion in the first region is less than 1 μm.

14. The battery cell of any one of claims 4-13, wherein, Both of the second conductive parts in the sub-electrode are welded to the conductive post.

15. The battery cell of any one of claims 4-14, wherein, The electrode assembly includes a tab cluster, the tab cluster includes a plurality of sub-tabs stacked together, the tab cluster is provided with the through hole, a plurality of second conductive parts in the tab cluster are electrically connected through the conductive post, and at least one of the second conductive parts in the tab cluster is welded to the conductive post.

16. The battery cell of claim 15, wherein, The battery cell further includes a terminal assembly and a pressing member. The terminal assembly includes the electrode terminal, and the tab cluster is pressed against the terminal assembly and the pressing member along the axial direction of the through hole. At least one of the conductive posts includes a first conductive post, which is disposed on the pressing member, inserted into the through hole, and welded to at least one of the second conductive portions in the tab cluster.

17. The battery cell of claim 16, wherein, The tab cluster is pressed against the pressing member and the electrode terminal along the axial direction, and the first conductive post is welded to the electrode terminal; Alternatively, the terminal assembly may further include an adapter structure, which is fixed and connected to the electrode terminal, wherein the tab cluster is pressed against the pressing member and the adapter structure along the axial direction, and the first conductive post is welded to the adapter structure.

18. The battery cell of claim 16 or 17, wherein, At least one of the conductive posts further includes a second conductive post, which is disposed on the terminal assembly, inserted into the through hole, and welded to at least one of the second conductive portions in the tab cluster; The first conductive post and the second conductive post are directly opposite each other along the axial direction and welded together; or, the first conductive post and the second conductive post are spaced apart along a direction perpendicular to the axial direction, and at least a portion of the first conductive post is directly opposite the second conductive post along a direction perpendicular to the axial direction.

19. The battery cell of any of claims 15-18, wherein, The battery cell further includes a terminal assembly, the terminal assembly including the electrode terminals; at least one of the conductive posts includes a second conductive post, the second conductive post being disposed on the terminal assembly and inserted into the through hole, and welded to at least one of the second conductive portions in the tab cluster.

20. The battery cell of claim 19, wherein, The battery cell also includes a pressing member, and the tab cluster is pressed against the terminal assembly and the pressing member along the axial direction of the through hole.

21. The battery cell of claim 20, wherein, The second conductive post is disposed on the electrode terminal; Alternatively, the terminal assembly may further include an adapter structure, which is fixed to and connected to the electrode terminal, and the second conductive post is disposed on the adapter structure.

22. The battery cell of any one of claims 1-21, wherein, The width of the first conductive part is greater than the width of the second conductive part, and the width direction of the first conductive part and the width direction of the second conductive part are both perpendicular to the distribution direction of the first conductive part and the second conductive part.

23. A battery device, characterized by Includes the battery cell according to any one of claims 1-22.

24. An electrical device, comprising: It includes a battery cell according to any one of claims 1-22; or, it includes a battery device according to claim 23.

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