Battery cell, battery device, and electric device

Abstract

This application provides a battery cell, a battery device, and an electrical device. The battery cell includes a casing, a first electrode lead-out component, and at least one electrode assembly. A first electrode lead-out hole is provided on a first wall, and the first electrode lead-out hole has a first center line. Each electrode assembly includes multiple first tabs of the same polarity. A portion of the first tabs in all electrode assemblies are stacked to form two first tab clusters, and another portion is stacked to form two second tab clusters. The first tab clusters and second tab clusters are arranged at intervals along the length of the first wall, located on both sides of the first center line. The two first tab clusters are respectively located on both sides of the first center line along the width direction of the first wall, and the two second tab clusters are respectively located on both sides of the first center line along the width direction of the first wall. The technical solution of this application can improve the energy density of the battery cell.

Description

Technical Field

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

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

[0003] Energy density is a crucial factor in the manufacturing process of battery devices. Therefore, improving the energy density of battery devices is a pressing technical challenge that needs to be addressed. Utility Model Content

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

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

[0006] In a first aspect, embodiments of this application provide a battery cell, which includes a housing, a first electrode lead-out component, and at least one electrode assembly; the housing includes a first wall, the first wall having a first electrode lead-out hole, the first electrode lead-out hole having a first center line, the first center line being parallel to the thickness direction of the first wall; the first electrode lead-out component is disposed on the first wall, a portion of the first electrode lead-out component is disposed within the first electrode lead-out hole, and a portion of the first electrode lead-out component is located on the inner side of the first wall; at least one electrode assembly is disposed within the housing, each electrode assembly including multiple first tabs of the same polarity, wherein all the first tabs of the electrode assemblies... Two first electrode tab clusters are formed by stacking a portion of the first electrode tabs in the first wall assembly. Two second electrode tab clusters are formed by stacking a portion of the first electrode tabs in the first wall assembly. The two first electrode tab clusters and the two second electrode tab clusters are arranged at intervals along the length of the first wall. The two first electrode tab clusters are located on one side of the first center line, and the two second electrode tab clusters are located on the other side of the first center line. The two first electrode tab clusters and the two second electrode tab clusters are electrically connected to the first electrode lead-out component. The two first electrode tab clusters are located on both sides of the first center line along the width of the first wall, and the two second electrode tab clusters are located on both sides of the first center line along the width of the first wall.

[0007] According to the battery cell of this application embodiment, a portion of the first tabs in all electrode assemblies are stacked to form two first tab clusters, and a portion of the first tabs in all electrode assemblies are stacked to form two second tab clusters. The two first tab clusters and the two second tab clusters are arranged at intervals along the length direction of the first wall. By respectively placing the two first tab clusters and the two second tab clusters on both sides of the first center line of the first electrode lead-out hole along the length direction of the first wall, the current flowing through the first electrode lead-out component is distributed on both sides of the first center line. The two first tab clusters are respectively located on the width direction of the first center line along the first wall. On both sides of the first center line, two second tab clusters are located on both sides of the width direction of the first wall to facilitate uniform current distribution and improve overcurrent effect. The number of first tabs in each tab cluster can be designed to be small, reducing the space occupied by multiple first tabs in the thickness direction of the first wall, improving the space utilization rate inside the battery cell in the thickness direction of the first wall, thereby improving the energy density of the battery cell. In addition, the smaller number of first tabs in each tab cluster can also reduce the welding power when welding the tab cluster to the first electrode lead-out component, reduce the damage to the first tab during welding, and improve the reliability of the battery cell.

[0008] According to some embodiments of this application, each first electrode tab cluster is welded to the first electrode lead-out component to form a first solder mark, and the two first solder marks are respectively located on both sides of the first center line along the width direction of the first wall; each second electrode tab cluster is welded to the first electrode lead-out component to form a second solder mark, and the two second solder marks are respectively located on both sides of the first center line along the width direction of the first wall.

[0009] In the above scheme, each first tab cluster is welded to the first electrode lead-out component to form a first solder mark, and each second tab cluster is welded to the first electrode lead-out component to form a second solder mark. By placing the two first solder marks on both sides of the first center line along the width direction of the first wall, and placing the two second solder marks on both sides of the first center line along the width direction of the first wall, the thickness of the first electrode lead-out component at the first solder mark and the thickness at the second solder mark can be designed to be relatively thin. This allows the structure after the first tab cluster and the first electrode lead-out component are connected to occupy less space in the thickness direction of the first wall, and the structure after the second tab cluster and the first electrode lead-out component are connected to occupy less space in the thickness direction of the first wall. This is beneficial to improving the space utilization rate inside the battery cell in the thickness direction of the first wall, thereby increasing the energy density of the battery cell.

[0010] According to some embodiments of this application, a portion of the first tab in at least one electrode assembly is used to form a first tab cluster, and another portion of the first tab in at least one electrode assembly is used to form a second tab cluster.

[0011] In the above scheme, a portion of the first tabs in the electrode assembly are used to form a first tab cluster, and another portion of the first tabs are used to form a second tab cluster. This allows the number of first tabs used to form each tab cluster to be relatively small, thereby reducing the space occupied by each tab cluster in the thickness direction of the first wall, thus improving the space utilization rate of the battery cell in the thickness direction of the first wall, and further improving the energy density of the battery cell.

[0012] According to some embodiments of this application, a single battery cell includes multiple electrode assemblies.

[0013] In the above scheme, the arrangement of multiple electrode components can increase the power of a single battery cell.

[0014] According to some embodiments of this application, a battery cell includes two electrode assemblies arranged along the width direction of a first wall; each electrode assembly has a first tab cluster and a second tab cluster.

[0015] In the above scheme, the battery cell includes two electrode assemblies, which enables the battery cell to have a high power capacity; the two electrode assemblies together form two first tab clusters and two second tab clusters. The number of first tabs in each tab cluster can be small, further reducing the space occupied by each tab cluster in the thickness direction of the first wall, thereby improving the space utilization rate of the battery cell in the thickness direction of the first wall, and thus improving the energy density of the battery cell.

[0016] According to some embodiments of this application, a battery cell includes four electrode assemblies arranged along the width direction of a first wall; portions of the first tabs of two electrode assemblies on the side closest to the width direction of the first wall together form a first tab cluster, and portions of the first tabs of two electrode assemblies on the side closest to the width direction of the first wall together form a second tab cluster; portions of the first tabs of two electrode assemblies on the other side closest to the width direction of the first wall together form another first tab cluster, and portions of the first tabs of two electrode assemblies on the other side closest to the width direction of the first wall together form another second tab cluster.

[0017] In the above scheme, the battery cell includes four electrode components, which enables the battery cell to have a high power capacity; each tab cluster is composed of the first tabs of two electrode components, which enables each tab cluster to have a high current carrying capacity, and the number of first tabs constituting each tab cluster is small, so as to reduce the space occupied by each tab cluster in the thickness direction of the first wall, thereby improving the space utilization rate of the battery cell in the thickness direction of the first wall, and thus improving the energy density of the battery cell.

[0018] According to some embodiments of this application, the electrode assembly is a wound structure, and the electrode assembly includes a first electrode sheet, a portion of which is wound around the first electrode sheet to form a first electrode tab cluster, and another portion of which is wound around the first electrode sheet to form a second electrode tab cluster.

[0019] In the above scheme, the electrode assembly is a wound structure. In this electrode assembly, the first tabs of different turns constitute the first tab cluster and the second tab cluster, respectively. The number of first tabs constituting the first tab cluster and the number of first tabs constituting the second tab cluster can be designed to be small, so that the first tab cluster and the second tab cluster occupy less space in the thickness direction of the first wall, which is beneficial to improve the space utilization rate of the battery cell in the thickness direction of the first wall, thereby improving the energy density of the battery cell.

[0020] According to some embodiments of this application, the electrode assembly is a wound structure, the electrode assembly includes a first electrode sheet, each turn of the first electrode sheet has two first electrode tabs, one of the two first electrode tabs is used to form a first electrode tab cluster, and the other of the two first electrode tabs is used to form a second electrode tab cluster.

[0021] In the above scheme, the electrode assembly is a wound structure, with two first tabs on each turn of the first electrode sheet. These two first tabs are used to form a first tab cluster and a second tab cluster, respectively. The number of first tabs forming the first tab cluster and the number of first tabs forming the second tab cluster can be designed to be small, which is beneficial to reduce the space occupied by the first tab cluster and the second tab cluster in the thickness direction of the first wall, and to improve the space occupancy rate of the battery cell in the thickness direction of the first wall, thereby improving the energy density of the battery cell.

[0022] According to some embodiments of this application, the electrode assembly includes a first central surface, which is perpendicular to the width direction of the first wall; the first electrode ear constituting the first electrode ear cluster and the first electrode ear constituting the second electrode ear cluster are respectively located on both sides of the first central surface.

[0023] In the above scheme, the first center plane is perpendicular to the width direction of the first wall, and the winding axis of the electrode assembly is within the first center plane. The first electrode tabs constituting the first electrode tab cluster and the first electrode tabs constituting the second electrode tab cluster are located on both sides of the first center plane, so as to facilitate uniform current distribution, improve the overcurrent effect of multiple first electrode tabs, and thus improve the charging and discharging performance of the battery cell.

[0024] According to some embodiments of this application, the electrode assembly is a stacked structure, and the electrode assembly includes a plurality of first electrodes, each first electrode having at least two first tabs, at least one of the first tabs being used to form a first tab cluster, and at least another of the first tabs being used to form a second tab cluster.

[0025] In the above scheme, compared with only one first tab per first electrode, at least two first tabs per first electrode are used to form a first tab cluster and a second tab cluster, respectively, which makes the total number of multiple first tabs larger, which is conducive to improving the overcurrent capacity of multiple first tabs, thereby improving the charging and discharging performance of the battery cell.

[0026] According to some embodiments of this application, the electrode assembly is a stacked structure, and the electrode assembly includes a plurality of first electrodes, each first electrode having a first tab, the first tabs of some of the plurality of first electrodes forming a first tab cluster, and the first tabs of another portion of the plurality of first electrodes forming a second tab cluster.

[0027] In the above scheme, each first electrode has a first tab. The first tabs of some first electrodes form a first tab cluster, and the first tabs of other first electrodes form a second tab cluster. The number of first tabs in each tab cluster is small, which can reduce the space occupied by each tab cluster in the thickness direction of the first wall, thereby improving the space utilization rate of the battery cell in the thickness direction of the first wall, and thus improving the energy density of the battery cell.

[0028] According to some embodiments of this application, the number of electrode assemblies is at least four, and the at least four electrode assemblies are arranged along the width direction of the first wall; all the first tabs of each electrode assembly are used to form a first tab cluster or a second tab cluster.

[0029] In the above scheme, the number of electrode assemblies is at least four, and the battery cell has a high charge capacity; all first tab clusters are formed by at least one of all electrode assemblies, and all second tab clusters are formed by at least another of all electrode assemblies. The first tab clusters and second tab clusters are spaced apart along the length of the first wall to make good use of the space inside the battery cell along the length of the first wall. The distance between the first tab clusters and the second tab clusters can be designed to be relatively large, thereby reducing the risk of increased internal resistance due to the distance between the first tab clusters and the second tab clusters being too close, and facilitating the improvement of the charge and discharge performance and service life of the battery cell.

[0030] According to some embodiments of this application, the electrode assembly is a wound structure, and the electrode assembly includes a first electrode sheet, each turn of the first electrode sheet having a first electrode tab, which is used to form a first electrode tab cluster or a second electrode tab cluster.

[0031] In the above scheme, each first electrode sheet has a first tab, and the first tabs of each electrode assembly constitute a first tab cluster or a second tab cluster. This allows the thickness of both the first tab cluster and the second tab cluster to be designed to be relatively small, which helps to reduce the space occupied by the first tab cluster and the second tab cluster in the thickness direction of the first wall. This is beneficial to improving the space utilization rate of the battery cell in the thickness direction of the first wall, thereby improving the energy density of the battery cell.

[0032] According to some embodiments of this application, the electrode assembly includes a first central surface, which is perpendicular to the width direction of the first wall; the electrode assembly is a wound structure, and the electrode assembly includes a first electrode sheet, each turn of the first electrode sheet having two first electrode tabs, which are respectively located on both sides of the first central surface, and each of the two first electrode tabs is used to form a first electrode tab cluster or a second electrode tab cluster.

[0033] In the above scheme, each first electrode has two first tabs, and the two first tabs are located on both sides of the first center plane, so that each tab cluster has a large number of first tabs, each tab cluster can have a large current carrying capacity, and multiple first tabs have a high current carrying capacity, which can improve the charging and discharging performance of the battery cell.

[0034] According to some embodiments of this application, the electrode assembly is a stacked structure, and the electrode assembly includes a plurality of first electrode plates, each of which has a first electrode tab, which is used to form a first electrode tab cluster or a second electrode tab cluster.

[0035] In the above scheme, each first electrode has a first tab while meeting the overcurrent requirements, which helps to reduce the internal resistance of the battery cell and improve the charging and discharging performance of the battery cell.

[0036] According to some embodiments of this application, the electrode assembly further includes a main body, a plurality of first electrode tabs extending from the main body, and a first electrode lead-out component including a first electrode terminal and a first adapter connected to each other. The first electrode terminal is disposed on a first wall, at least a portion of the first electrode terminal is located on the outer side of the first wall, at least a portion of the first adapter is located on the inner side of the first wall, the first adapter is disposed between the first wall and the main body, and two first electrode tab clusters and two second electrode tab clusters are electrically connected to the first adapter respectively.

[0037] In the above scheme, the first electrode terminal is disposed on the first wall, and at least a portion of the first electrode terminal is located on the outside of the first wall to facilitate electrical connection with a conductive component (such as a busbar) outside the battery cell; at least a portion of the first adapter is located on the inside of the first wall to facilitate connection between the first adapter and the first tab cluster and the second tab cluster.

[0038] According to some embodiments of this application, the thickness of the first adapter is T, which satisfies 0.4mm≤T≤2.5mm.

[0039] In the above scheme, since the first tab cluster and the second tab cluster are located on both sides of the first center line, the multiple first tabs have a high current carrying capacity. The thickness of the first adapter can be designed to be small. For example, the thickness of the first adapter can be designed to be greater than or equal to 0.4 mm and less than or equal to 2.5 mm. Under the condition that the first adapter is reliably connected to the first tab cluster, the second tab cluster and the first electrode terminal, it is convenient to save the space inside the battery cell in the thickness direction of the first wall, which is conducive to improving the space utilization rate inside the battery cell in the thickness direction of the first wall, so that the battery cell has a high energy density.

[0040] According to some embodiments of this application, the first adapter includes a first connection area and a second connection area, a first electrode cluster and a second electrode cluster are connected to the first connection area, a first electrode terminal is connected to the second connection area, and the thickness of the first connection area is less than the thickness of the second connection area.

[0041] In the above scheme, compared to multiple first tabs forming a tab cluster, multiple first tabs forming two first tab clusters and two second tab clusters can be designed to be smaller while meeting the overall overcurrent requirements. This allows for a smaller thickness of the first connection area connected to each first tab cluster and each second tab cluster, thereby reducing the space occupied by the first connection area in the thickness direction of the first wall, improving the space utilization rate of the battery cell in the thickness direction of the first wall, and increasing the energy density of the battery cell.

[0042] According to some embodiments of this application, each first tab cluster forms a first solder mark with the first adapter, and the two first solder marks are respectively located on both sides of the first center line along the width direction of the first wall; each second tab cluster forms a second solder mark with the first adapter, and the two second solder marks are respectively located on both sides of the first center line along the width direction of the first wall.

[0043] In the above scheme, the two first solder marks are located on both sides of the first center line along the width direction of the first wall, and the two second solder marks are located on both sides of the first center line along the width direction of the first wall. The two first solder marks and the two second solder marks are located on both sides of the first center line along the length direction of the first wall. This makes the current distribution at each solder mark less, and the thickness of the first adapter at each solder mark can be designed to be thinner. This allows the structure after each tab cluster is connected to the first adapter to occupy less space in the thickness direction of the first wall, which is beneficial to improving the space utilization rate inside the battery cell in the thickness direction of the first wall, thereby improving the energy density of the battery cell.

[0044] According to some embodiments of this application, the first adapter is provided with a first notch and a second notch. The first notch and the second notch are respectively located at both ends of the first adapter along the length direction of the first wall. Along the width direction of the first wall, the first notch is located between two first solder marks, and the second notch is located between two second solder marks.

[0045] In the above scheme, the setting of the first notch and the second notch can reduce the weight of the first adapter, which is conducive to reducing the overall weight of the battery cell; at the same time, the first notch and the second notch can also facilitate the assembly and positioning of the first adapter, improving assembly efficiency.

[0046] According to some embodiments of this application, the first electrode lead-out component includes a first electrode terminal, a portion of which is located inside the first electrode lead-out hole, and a portion of which is located inside the first wall and connected to the first electrode tab cluster and the second electrode tab cluster.

[0047] In the above scheme, the first electrode terminal passes through the first electrode lead-out hole, with its two ends located on the outer and inner sides of the first wall, respectively. The portion of the first electrode terminal located on the inner side of the first wall connects to the first and second electrode tab clusters. This reduces the number of components in the battery cell, simplifying the battery cell structure and lowering manufacturing costs. Simultaneously, the thickness of the portion of the first electrode terminal inside the battery cell can be designed to be thinner, reducing the space occupied by this portion in the thickness direction of the first wall. This improves the space utilization rate within the battery cell in the thickness direction of the first wall, facilitating an increase in the energy density of the battery cell.

[0048] According to some embodiments of this application, the first electrode lead-out component includes a first connecting portion and a second connecting portion connected to each other, the first connecting portion being connected to a first electrode tab cluster, and the second connecting portion being connected to a second electrode tab cluster; the electrode assembly also includes a main body portion, and a plurality of first electrode tabs extending from the main body portion; the first wall includes a first region and a second region, the first region including a first inner surface facing the main body portion, the second region including a second inner surface facing the main body portion, and along the thickness direction of the first wall, the second inner surface being further away from the main body portion relative to the first inner surface portion; at least a portion of the first connecting portion is located between the second inner surface portion and the first inner surface portion, and the second connecting portion is located on the side of the first inner surface portion facing the main body portion.

[0049] In the above scheme, the second inner surface is further away from the main body than the first inner surface. The space formed between the first inner surface and the second inner surface can increase the space inside the battery cell in the thickness direction of the first wall, so that the thickness of the first connection part can be thicker, and / or the number of first tabs of the first tab cluster can be larger, so as to improve the current flow capacity between the first tab cluster and the first connection part and improve the charging and discharging performance of the battery cell.

[0050] According to some embodiments of this application, the number of first electrodes constituting the first electrode cluster is greater than the number of first electrodes constituting the second electrode cluster.

[0051] In the above scheme, by designing the number of first tabs constituting the first tab cluster to be greater than the number of first tabs constituting the second tab cluster, the space between the first inner surface and the second inner surface can be utilized to improve the overcurrent capacity between the first tab cluster and the first connection part, thereby improving the charge and discharge performance of the battery cell.

[0052] According to some embodiments of this application, the thickness of the first connecting portion is greater than the thickness of the second connecting portion.

[0053] In the above solution, by designing the thickness of the first connecting part to be greater than the thickness of the second connecting part, the space between the first inner surface and the second inner surface can be utilized to improve the current carrying capacity of the first connecting part and facilitate meeting the fast charging requirements.

[0054] According to some embodiments of this application, each electrode assembly includes a body portion having a first end facing a first wall, and a plurality of first tabs extending from the first end.

[0055] In the above scheme, multiple first tabs extend from the first end, utilizing the space between the first wall and the main body to improve the space utilization rate inside the battery cell. Furthermore, the extension length of the first tabs can be designed to be relatively small, reducing the risk of the first tabs in the wound electrode assembly flipping, which facilitates the improvement of the yield and reliability of the battery cell.

[0056] According to some embodiments of this application, a second electrode lead-out hole is provided on the first wall, and the second electrode lead-out hole and the first electrode lead-out hole are spaced apart along the length direction of the first wall. The second electrode lead-out hole has a second center line, which is parallel to the thickness direction of the first wall. The battery cell also includes a second electrode lead-out component, a part of which is disposed in the second electrode lead-out hole, and a part of which is located on the inner side of the first wall. The electrode assembly also includes a plurality of second tabs, the polarity of which is opposite to that of all the first tabs. The plurality of second tabs extend from the first end, and all electrode assemblies... A portion of the second electrode tab in the component forms two third electrode tab clusters, and another portion of the second electrode tab in all electrode assemblies forms two fourth electrode tab clusters. Along the length direction of the first wall, the two third electrode tab clusters and the two fourth electrode tab clusters are arranged at intervals. The two third electrode tab clusters are located on one side of the second center line, and the two fourth electrode tab clusters are located on the other side of the second center line. The two third electrode tab clusters and the two fourth electrode tab clusters are electrically connected to the second electrode lead-out component, respectively. The two third electrode tab clusters are located on both sides of the second center line along the width direction of the first wall, and the two fourth electrode tab clusters are located on both sides of the second center line along the width direction of the first wall.

[0057] In the above scheme, along the thickness direction of the first wall, all the second tabs and all the first tabs are located on the same side of the main body to facilitate the input or output of electrical energy of the electrode assembly on the same side of the battery cell; the second tabs of all electrode assemblies form two third tab clusters and two fourth tab clusters. By respectively arranging the two third tab clusters and two fourth tab clusters on both sides of the second center line of the second electrode lead-out hole along the length direction of the first wall, the current flowing through the second electrode lead-out component is distributed on both sides of the second center line, and the two third tab clusters are respectively located on both sides of the second center line along the width direction of the first wall. The two fourth tab clusters are located on both sides of the second center line along the width direction of the first wall, so as to facilitate uniform current distribution and improve the overcurrent effect. The number of second tabs in each tab cluster can be designed to be smaller, reducing the space occupied by multiple second tabs in the thickness direction of the first wall, improving the space utilization rate inside the battery cell in the thickness direction of the first wall, thereby improving the energy density of the battery cell. In addition, the smaller number of second tabs in each tab cluster can also reduce the welding power when welding the tab cluster to the second electrode lead-out component, reduce the damage to the second tab during welding, and improve the reliability of the battery cell.

[0058] According to some embodiments of this application, the electrode assembly includes a flat region, and the electrode sheets of the electrode assembly are stacked in the flat region along the width direction of the first wall.

[0059] In the above scheme, the thickness direction of the battery cell is parallel to the width direction of the first wall.

[0060] Secondly, embodiments of this application also provide a battery device, which includes a battery cell provided according to any of the above embodiments.

[0061] Thirdly, embodiments of this application also provide an electrical device, which includes a battery cell provided according to any of the above embodiments, the battery cell being used to provide electrical energy; or, the electrical device includes a battery device provided according to any of the above embodiments, the battery device being used to provide electrical energy.

[0062] 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

[0063] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0064] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0065] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0066] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0067] Figure 4 This is a schematic diagram of the assembly of the first electrode tab cluster and the second electrode tab cluster with the first electrode lead-out component, provided for some embodiments of this application;

[0068] Figure 5 A schematic diagram illustrating the connection status of two first electrode tabs and two second electrode tabs with the first electrode lead-out component, provided in some embodiments of this application;

[0069] Figure 6 This is a schematic diagram of the structure of two wound electrode assemblies provided in some embodiments of this application;

[0070] Figure 7 This is a schematic diagram of the structure of two stacked electrode assemblies provided in some embodiments of this application;

[0071] Figure 8 This is a schematic diagram of the structure of a wound electrode assembly provided in some embodiments of this application;

[0072] Figure 9 This is a schematic diagram of the structure of a stacked electrode assembly provided in some embodiments of this application;

[0073] Figure 10 This is a schematic diagram of the structure of a stacked electrode assembly provided in other embodiments of this application;

[0074] Figure 11 This is a schematic diagram of the structure of multiple electrode assemblies provided in some embodiments of this application;

[0075] Figure 12 This is a schematic diagram of the structure of a wound electrode assembly provided in other embodiments of this application;

[0076] Figure 13 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0077] Figure 14 for Figure 13 Enlarged view of a portion at point A;

[0078] Figure 15 A schematic diagram illustrating the connection status of two first electrode clusters and two second electrode clusters with a first adapter, provided in some embodiments of this application;

[0079] Figure 16 A schematic diagram of the assembly of the first electrode tab cluster and the second electrode tab cluster with the first electrode lead-out component provided for other embodiments of this application;

[0080] Figure 17 A schematic diagram of the assembly of the first electrode tab cluster and the second electrode tab cluster with the first electrode lead-out component provided for other embodiments of this application;

[0081] Figure 18 for Figure 13 A magnified view of section B;

[0082] Figure 19 This is a schematic diagram showing the connection status of two first electrode clusters and two second electrode clusters with the second electrode lead-out component, provided for some embodiments of this application.

[0083] Icons: 1000 - Vehicle; 100 - Battery Unit; 200 - Controller; 300 - Motor; 10 - Housing; 11 - First Sub-Housing; 12 - Second Sub-Housing; 20 - Battery Cell; 21 - Housing; 21a - Shell; 21b - End Cap; 211 - First Wall; 211a - First Electrode Lead-Out Hole; 211b - First Region; 211c - Second Region; 211d - First Inner Surface; 211e - Second Inner Surface; 211f - First Transition Surface; 211g - Second Electrode Lead-Out Hole; 22 - First Electrode Lead-Out Component; 221 - First Connecting Part; 222 - Second Connecting Part; 22a - First Section; 22b - Second Section; 22c - Third Section; 22d - First Electrode Terminal; 22e - First Adapter; 22f - First Connecting Area; 22g - Second connection area; 23- Electrode assembly; 23a- Straight area; 23b- Main body; 23c- First electrode tab; 23d- Second electrode tab; 231- First electrode plate; 231a- First electrode tab cluster; 231b- Second electrode tab cluster; 232- Second electrode plate; 232a- Third electrode tab cluster; 232b- Fourth electrode tab cluster; 24- Second electrode lead-out component; 25- Insulating component; 26- Sealing component; C1- First center line; C2- Second center line; D1- First end; D2- Second end; F1- First center surface; F2- Second center surface; H1- First solder mark; H2- Second solder mark; H3- Third solder mark; H4- Fourth solder mark; K1- First notch; K2- Second notch; X- Width direction of the first wall; Y-Length direction of the first wall; Z-Thickness direction of the first wall. Detailed Implementation

[0084] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0085] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0086] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0087] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0088] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0089] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0090] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0091] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0092] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0093] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0094] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0095] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0096] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0097] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0098] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0099] In some embodiments, the battery device refers to an energy storage device. The energy storage device includes a housing, with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0100] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0101] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0102] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0103] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0104] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0105] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0106] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0107] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0108] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0109] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0110] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0111] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0112] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0113] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0114] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0115] In some implementations, the electrode assembly is a stacked structure.

[0116] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0117] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0118] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tabs of the electrode assembly. The electrode terminal may be located on the end cap or on the housing.

[0119] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0120] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0121] As an example, a battery cell can be a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0122] The development of battery device technology must take into account multiple design factors, such as energy density, assembly efficiency, safety and reliability, as well as the charge and discharge performance of the battery device.

[0123] In some embodiments, a battery cell includes a housing, electrode lead-out components, and at least one electrode assembly. At least one electrode assembly is disposed within the housing, and the electrode lead-out components are disposed on a first wall of the housing. The first wall has electrode lead-out holes through which the electrode lead-out components pass. Each electrode assembly is typically connected to its corresponding electrode lead-out component via a tab cluster of the same polarity. To meet the requirement of a large current carrying capacity, the electrode lead-out components are designed to be relatively thick. When there are multiple electrode assemblies, all electrode assemblies are connected to their corresponding electrode lead-out components only via two tab clusters of the same polarity. However, these two tab clusters are located on the same side of the length direction of the first wall along the centerline of the electrode lead-out holes, allowing a larger current to flow through the portion of the electrode lead-out component located on that side. Because the electrode lead-out components need to meet the requirement of carrying a large current, their thickness is typically designed to be relatively thick. The electrode lead-out components occupy a large assembly space in the thickness direction of the first wall, resulting in low space utilization within the battery cell in the thickness direction of the first wall, and consequently, low energy density in the battery cell.

[0124] In view of this, in order to solve the problem that the electrode lead-out component occupies a large assembly space in the thickness direction of the first wall, resulting in a low energy density of the battery cell, this application provides a battery cell including a shell, a first electrode lead-out component, and an electrode assembly; the battery cell includes a shell, a first electrode lead-out component, and at least one electrode assembly; the shell includes a first wall, the first wall is provided with a first electrode lead-out hole, the first electrode lead-out hole has a first center line, the first center line is parallel to the thickness direction of the first wall; the first electrode lead-out component is disposed in the first wall, a portion of the first electrode lead-out component is disposed in the first electrode lead-out hole, and a portion of the first electrode lead-out component is located inside the first wall; at least one electrode assembly is disposed inside the shell. Each electrode assembly includes multiple first tabs of the same polarity. A portion of the first tabs in all electrode assemblies are stacked to form two first tab clusters, and a portion of the first tabs in all electrode assemblies are stacked to form two second tab clusters. Along the length of the first wall, the two first tab clusters and the two second tab clusters are arranged at intervals. The two first tab clusters are located on one side of the first center line, and the two second tab clusters are located on the other side of the first center line. The two first tab clusters and the two second tab clusters are electrically connected to the first electrode lead-out component, respectively. The two first tab clusters are located on both sides of the first center line along the width direction of the first wall, and the two second tab clusters are located on both sides of the first center line along the width direction of the first wall.

[0125] In such a battery cell, a portion of the first tabs in all electrode assemblies are stacked to form two first tab clusters, and a portion of the first tabs in all electrode assemblies are stacked to form two second tab clusters. The two first tab clusters and the two second tab clusters are arranged at intervals along the length of the first wall. By placing the two first tab clusters and the two second tab clusters on both sides of the first center line of the first electrode lead-out hole along the length of the first wall, the current flowing through the first electrode lead-out component is distributed on both sides of the first center line. The two first tab clusters are respectively located on the width of the first center line along the width of the first wall. On both sides, two second tab clusters are located on both sides of the width direction of the first center line along the first wall, so as to facilitate uniform current distribution and improve the overcurrent effect. The number of first tabs in each tab cluster can be designed to be small, reducing the space occupied by multiple first tabs in the thickness direction of the first wall, improving the space utilization rate inside the battery cell in the thickness direction of the first wall, thereby improving the energy density of the battery cell. In addition, the smaller number of first tabs in each tab cluster can also reduce the welding power when welding the tab cluster to the first electrode lead-out component, reduce the damage to the first tab during welding, and improve the reliability of the battery cell.

[0126] The battery cells and battery devices disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery cells and battery devices disclosed in this application.

[0127] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices.

[0128] Electrical devices can include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as airplanes, rockets, space shuttles, and spacecraft.

[0129] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0130] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0131] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

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

[0133] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, with the battery cells 20 housed within the housing 10.

[0134] The housing 10 provides a space for housing the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, and together define a space for housing the battery cell 20. The second sub-housing 12 may be a hollow structure with one end open, and the first sub-housing 11 may be a plate-like structure, with the first sub-housing 11 covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 together define the space; the first sub-housing 11 and the second sub-housing 12 may also be hollow structures with one side open, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0135] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0136] Please refer to Figures 3 to 5 , Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application. Figure 4This is a schematic diagram illustrating the assembly of the first and second electrode tab clusters with the first electrode lead-out component according to some embodiments of this application. Figure 5 This is a schematic diagram illustrating the connection status of two first electrode clusters and two second electrode clusters with the first electrode lead-out component, provided in some embodiments of this application. Figure 5 Only two first electrode tab clusters and two second electrode tab clusters are shown in connection with the first electrode lead-out component. Both the first and second electrode tab clusters are connected to the first electrode lead-out component to illustrate the first and second solder marks. This application provides a battery cell 20, which includes a housing 21, a first electrode lead-out component 22, and at least one electrode assembly 23. The housing 21 includes a first wall 211 with a first electrode lead-out hole 211a; the first electrode lead-out component 22 is disposed on the first wall 211, a portion of which is disposed within the first electrode lead-out hole 211a, and a portion of which is located inside the first wall 211; at least one electrode assembly 23 is disposed within the housing 21. Each electrode assembly 23 includes multiple first tabs 23c of the same polarity. A portion of the first tabs 23c in all electrode assemblies 23 are stacked to form two first tab clusters 231a, and another portion of the first tabs 23c in all electrode assemblies 23 are stacked to form two second tab clusters 231b. The first electrode lead-out hole 211a has a first center line C1, which is parallel to the thickness direction Z of the first wall. The two first tab clusters 231a and the two second tab clusters 231b are arranged at intervals along the length direction Y of the first wall. Along the length direction Y of the first wall, the two first tab clusters 231a are located on one side of the first center line C1, and the two second tab clusters 231b are located on the other side of the first center line C1. The two first tab clusters 231a and the two second tab clusters 231b are electrically connected to the first electrode lead-out component 22. Two first pole ear clusters 231a are located on both sides of the first center line C1 along the width direction X of the first wall, and two second pole ear clusters 231b are located on both sides of the first center line C1 along the width direction X of the first wall.

[0137] The housing 21 includes a housing 21a and an end cap 21b. The housing 21a has an opening, and the end cap 21b closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0138] The housing 21a is a component used to cooperate with the end cap 21b to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 21a and the end cap 21b can be independent components. The housing 21a can have various shapes and sizes. Specifically, the shape of the housing 21a can be determined according to the specific shape and size of the electrode assembly 23. The housing 21a can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0139] End cap 21b refers to a component that covers the opening of housing 21a to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21b can be adapted to the shape of housing 21a to fit it. Optionally, end cap 21b can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21b is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on end cap 21b. Electrode terminals can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. The material of end cap 21b can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure can also be provided on the inner side of end cap 21b. The insulating structure can be used to isolate the electrical connection components inside housing 21a from end cap 21b to reduce the risk of short circuit. For example, the insulating structure can be made of plastic, rubber, etc.

[0140] In some embodiments, the outer casing 21 is cuboid. For example, the length direction of the first wall 211 may be parallel to the length direction of the outer casing 21, or the length direction of the first wall 211 may be parallel to the width direction of the outer casing 21. Optionally, the length direction of the first wall 211 is parallel to the length direction of the outer casing 21.

[0141] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 21a may contain one or more electrode assemblies 23. The electrode assembly 23 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body 23b of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body 23b or separately at both ends of the main body 23b.

[0142] The first wall 211 can be a wall portion of the housing 21a or an end cap 21b.

[0143] The first electrode lead-out component 22 is internally used for electrical connection with the first tab 23c of the electrode assembly 23, and externally used for electrical connection with conductive components (such as busbars) outside the battery cell 20, so as to output or input electrical energy of the battery cell 20.

[0144] In some embodiments, the first wall 211 is provided with a first electrode lead-out hole 211a, which penetrates the first wall 211 along the thickness direction Z. A portion of the first electrode lead-out component 22 is disposed within the first electrode lead-out hole 211a, and a portion of the first electrode lead-out component 22 is located on the inner side of the first wall 211 to facilitate connection between the first electrode lead-out component 22 and the first tab 23c. The inner side of the first wall 211 refers to the side of the first wall 211 facing the main body portion 23b, that is, the side of the first wall 211 facing the interior of the battery cell 20; correspondingly, the outer side of the first wall 211 refers to the side of the first wall 211 away from the main body portion 23b, that is, the side of the first wall 211 away from the interior of the battery cell 20.

[0145] For ease of description, the first electrode lead-out component 22 may include a first part 22a, a second part 22b and a third part 22c. The first part 22a is located outside the first wall 211, at least a portion of the second part 22b is located inside the first electrode lead-out hole 211a, and the third part 22c is located inside the first wall 211.

[0146] The first tab cluster 231a and the second tab cluster 231b are electrically connected to the third part 22c, respectively.

[0147] Each electrode assembly 23 includes a flat region, in which the electrode sheets of the electrode assembly 23 are stacked along the width direction of the first wall. The flat region of the electrode assembly 23 may correspond to the large surface of the outer casing 21. The flat region may be a region of the electrode assembly 23 with a flat structure, and the portions of the positive electrode sheet and the negative electrode sheet located in the flat region may be substantially flat, that is, extending along the plane.

[0148] When the electrode assembly 23 has a stacked structure, the positive and negative electrode sheets are stacked in the flat region along the width direction X of the first wall. When the electrode assembly 23 has a wound structure, the electrode assembly 23 includes a flat region and two bending regions. The two ends of the flat region in the length direction Y of the first wall are respectively connected to the two bending regions, and the positive and negative electrode sheets are stacked in the flat region along the width direction X of the first wall.

[0149] Electrode assembly 23 includes a first electrode 231 (e.g., Figure 7As shown, the first electrode 231 includes a first current collector and a first active material layer. The first current collector includes a first main body region and a first tab 23c. The first active material layer is disposed in the first main body region. The first tab 23c does not have the first active material layer. The first main body region with the first active material layer constitutes part of the main body 23b.

[0150] In some embodiments, the first electrode 231 can be a positive electrode and the first tab 23c can be a positive tab, or the first electrode 231 can be a negative electrode and the first tab 23c can be a negative tab.

[0151] The main body 23b may include a first end D1 and a second end D2 disposed opposite to each other in the thickness direction Z of the first wall, with the first end D1 being closer to the first wall 211 than the second end D2. In some embodiments, at least a portion of the plurality of first tabs 23c may be disposed at the first end D1 to facilitate electrical connection between the plurality of first tabs 23c and the first electrode lead-out member 22. In other embodiments, the plurality of first tabs 23c may also be located at other ends of the main body 23b.

[0152] In all electrode assemblies 23, a portion of the first tabs 23c are stacked to form two first tab clusters 231a. The multiple first tabs 23c in each first tab cluster 231a are electrically connected to form a whole.

[0153] In all electrode assemblies 23, another portion of the first electrode tabs 23c are stacked to form two second electrode tab clusters 231b. The multiple first electrode tabs 23c in each second electrode tab cluster 231b are electrically connected to form a whole.

[0154] A tab cluster refers to a structure formed by stacking multiple tabs.

[0155] Two first awl clusters 231a and two second awl clusters 231b are arranged at intervals along the length direction Y of the first wall. On the same projection plane perpendicular to the width direction X of the first wall, the orthographic projections of the two first awl clusters 231a overlap at least partially, and the orthographic projections of the two second awl clusters 231b overlap at least partially. The orthographic projections of the first awl clusters 231a and the second awl clusters 231b do not overlap. Furthermore, along the length direction Y of the first wall, the orthographic projections of the first awl clusters 231a and the second awl clusters 231b are located on both sides of the orthographic projection of the first centerline C1.

[0156] In some embodiments, the two first electrode clusters 231a and the two second electrode clusters 231b can be welded to the first electrode lead-out component 22 respectively. For example, each first electrode cluster 231a and each second electrode cluster 231b can be ultrasonically welded to the first electrode lead-out component 22 respectively, or each first electrode cluster 231a and each second electrode cluster 231b can be laser welded to the first electrode lead-out component 22 respectively, so that the first electrode clusters 231a and the second electrode clusters 231b are reliably connected to the first electrode lead-out component 22, facilitating the flow of current between the first electrode clusters 231a and the second electrode clusters 231b and the first electrode lead-out component 22.

[0157] In some embodiments, the first wall 211 may be cuboid, and the length direction Y of the first wall may be parallel to the length direction of the battery cell 20; the width direction X of the first wall may be parallel to the thickness direction of the battery cell 20.

[0158] All electrode assemblies 23 have two first tab clusters 231a and two second tab clusters 231b. All electrode assemblies 23 have a large number of first tabs 23c, which provides high current carrying capacity.

[0159] According to the battery cell 20 of this application embodiment, a portion of the first tabs 23c in all electrode assemblies 23 are stacked to form two first tab clusters 231a, and a portion of the first tabs 23c in all electrode assemblies 23 are stacked to form two second tab clusters 231b. The two first tab clusters 231a and the two second tab clusters 231b are arranged at intervals along the length direction Y of the first wall. By distributing the two first tab clusters 231a and the two second tab clusters 231b on both sides of the first center line C1 of the first electrode lead-out hole 211a along the length direction Y of the first wall, the current flowing through the first electrode lead-out component 22 is distributed on both sides of the first center line C1. The two first tab clusters 231a are respectively located on the first center line C1. Two second tab clusters 231b are located on both sides of the center line C1 along the width direction X of the first wall, respectively, to facilitate uniform current distribution and improve overcurrent effect. The number of first tabs 23c in each tab cluster can be designed to be small, reducing the space occupied by multiple first tabs 23c in the thickness direction Z of the first wall, improving the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall, thereby improving the energy density of the battery cell 20. In addition, the small number of first tabs 23c in each tab cluster can also reduce the welding power when welding the tab cluster to the first electrode lead-out component 22, reducing the damage to the first tabs 23c during welding, and improving the reliability of the battery cell 20.

[0160] Please refer to Figure 5According to some embodiments of this application, each first electrode cluster 231a is welded to the first electrode lead-out component 22 to form a first solder mark H1, and the two first solder marks H1 are respectively located on both sides of the first center line C1 along the width direction X of the first wall; each second electrode cluster 231b is welded to the first electrode lead-out component 22 to form a second solder mark H2, and the two second solder marks H2 are respectively located on both sides of the first center line C1 along the width direction X of the first wall.

[0161] In some embodiments, each tab cluster and the first electrode lead-out component 22 can be connected by ultrasonic welding.

[0162] In the above scheme, each first tab cluster 231a is welded to the first electrode lead-out component 22 to form a first solder mark H1, and each second tab cluster 231b is welded to the first electrode lead-out component 22 to form a second solder mark H2. By placing the two first solder marks H1 on both sides of the first center line C1 along the width direction X of the first wall, and placing the two second solder marks H2 on both sides of the first center line C1 along the width direction X of the first wall, the thickness of the first electrode lead-out component 22 at the first solder mark H1 and the thickness at the second solder mark H2 can be designed to be relatively thin. This allows the structure after the first tab cluster 231a and the first electrode lead-out component 22 are connected to occupy a small space in the thickness direction Z of the first wall, and the structure after the second tab cluster 231b and the first electrode lead-out component 22 are connected to occupy a small space in the thickness direction Z of the first wall. This is beneficial to improving the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall, thereby improving the energy density of the battery cell 20.

[0163] According to some embodiments of this application, at least one portion of the first tab 23c in the electrode assembly 23 is used to form a first tab cluster 231a, and at least another portion of the first tab 23c in the electrode assembly 23 is used to form a second tab cluster 231b.

[0164] In the electrode assembly 23 described above, a portion of the first tabs 23c are used to form a first tab cluster 231a, and another portion of the first tabs 23c are used to form a second tab cluster 231b. All the first tabs 23c of the same electrode assembly 23 are respectively used to form a first tab cluster 231a and a second tab cluster 231b. All the first tabs 23c of the electrode assembly 23 can form at least one first tab cluster 231a and at least one second tab cluster 231b.

[0165] In the above scheme, a portion of the first tabs 23c in the electrode assembly 23 is used to form a first tab cluster 231a, and another portion of the first tabs 23c is used to form a second tab cluster 231b. This allows the number of first tabs 23c used by the electrode assembly 23 to form each tab cluster to be relatively small, so as to reduce the space occupied by each tab cluster in the thickness direction Z of the first wall, thereby improving the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall, and thus improving the energy density of the battery cell 20.

[0166] Please refer to Figure 3 According to some embodiments of this application, the battery cell 20 includes a plurality of electrode assemblies 23.

[0167] If the battery cell 20 has only one electrode assembly 23, the battery cell 20 will have a low capacity. Furthermore, if the electrode assembly 23 is too thick, its manufacturing process will be more difficult. Therefore, in this embodiment, by providing multiple electrode assemblies 23, the capacity of the battery cell 20 can be increased.

[0168] Please refer to Figure 6 and Figure 7 , Figure 6 This is a schematic diagram of the structure of two wound electrode assemblies provided in some embodiments of this application. Figure 7 This is a schematic diagram of the structure of two stacked electrode assemblies provided in some embodiments of this application. According to some embodiments of this application, the battery cell 20 includes two electrode assemblies 23, which are arranged along the width direction X of the first wall; each electrode assembly 23 has a first tab cluster 231a and a second tab cluster 231b.

[0169] Each electrode assembly 23 has a first tab cluster 231a and a second tab cluster 231b, such that the two electrode assemblies 23 have two first tab clusters 231a and two second tab clusters 231b.

[0170] In the above scheme, the battery cell 20 includes two electrode components 23, which enables the battery cell 20 to have a high power capacity; the two electrode components 23 together form two first tab clusters 231a and two second tab clusters 231b. The number of first tabs 23c in each tab cluster can be small, further reducing the space occupied by each tab cluster in the thickness direction Z of the first wall, thereby improving the space utilization rate of the battery cell 20 in the thickness direction Z of the first wall, and thus improving the energy density of the battery cell 20.

[0171] Please refer to Figure 3According to some embodiments of this application, the battery cell 20 includes four electrode assemblies 23, which are arranged along the width direction X of the first wall. The first tabs 23c of two electrode assemblies 23 on the side closest to the width direction X of the first wall together form a first tab cluster 231a, and the other part of the first tabs 23c of two electrode assemblies 23 on the side closest to the width direction X of the first wall together form a second tab cluster 231b. The first tabs 23c of two electrode assemblies 23 on the other side of the width direction X of the first wall together form another first tab cluster 231a, and the other part of the first tabs 23c of two electrode assemblies 23 on the other side of the width direction X of the first wall together form another second tab cluster 231b.

[0172] Four electrode assemblies 23 are arranged along the width direction of the first wall. In the width direction X of the first wall, the four electrode assemblies 23 form two sets of electrode assemblies 23. A portion of the first tabs 23c of one set of electrode assemblies 23 together form a first tab cluster 231a, and another portion of the first tabs 23c of this set of electrode assemblies 23 together form a second tab cluster 231b. A portion of the first tabs 23c of the other set of electrode assemblies 23 together form another first tab cluster 231a, and another portion of the first tabs 23c of this set of electrode assemblies 23 together form another second tab cluster 231b.

[0173] In the above scheme, the battery cell 20 includes four electrode components 23, which enables the battery cell 20 to have a high power capacity; each tab cluster is composed of the first tabs 23c of two electrode components 23, which enables each tab cluster to have a high current carrying capacity, and the number of first tabs 23c constituting each tab cluster is small, so as to reduce the space occupied by each tab cluster in the thickness direction Z of the first wall, thereby improving the space utilization rate of the battery cell 20 in the thickness direction Z of the first wall, and thus improving the energy density of the battery cell 20.

[0174] According to some embodiments of this application, the electrode assembly 23 has a wound structure. The electrode assembly 23 includes a first electrode sheet 231, a portion of which is a first electrode tab 23c that is wound around the first electrode sheet 231 to form a first electrode tab cluster 231a, and another portion of which is a first electrode tab 23c that is wound around the first electrode sheet 231 to form a second electrode tab cluster 231b.

[0175] All the first pole ears 23c of the first pole piece 231, which are provided with the first pole ears 23c, are used to form a first pole ear cluster 231a, and all the first pole ears 23c of the first pole piece 231, which are provided with the first pole ears 23c, are used to form a second pole ear cluster 231b. For example, on the same projection plane in the width direction X perpendicular to the first wall, the orthographic projections of the first pole ears 23c of the first pole piece 231 of the first pole piece 231 overlap and are used to form a first pole ear cluster 231a; the orthographic projections of the first pole ears 23c of the first pole piece 231 of the other part overlap and are used to form a second pole ear cluster 231b.

[0176] In the above scheme, the electrode assembly 23 has a wound structure. In the electrode assembly 23, the first tabs 23c of different turns respectively constitute the first tab cluster 231a and the second tab cluster 231b. The number of first tabs 23c constituting the first tab cluster 231a and the number of first tabs 23c constituting the second tab cluster 231b can be designed to be small, so that the first tab cluster 231a and the second tab cluster 231b occupy less space in the thickness direction Z of the first wall. This is beneficial to improving the space utilization rate of the battery cell 20 in the thickness direction Z of the first wall, thereby improving the energy density of the battery cell 20.

[0177] According to some embodiments of this application, the electrode assembly 23 has a wound structure. The electrode assembly 23 includes a first electrode sheet 231. Each turn of the first electrode sheet 231 has two first electrode tabs 23c. One of the two first electrode tabs 23c is used to form a first electrode tab cluster 231a, and the other of the two first electrode tabs 23c is used to form a second electrode tab cluster 231b.

[0178] The electrode assembly 23 has a first center surface F1, which is perpendicular to the width direction X of the first wall, and the winding axis of the electrode assembly 23 is located within the first center surface F1. Each turn of the first electrode 231 has two straight sections, which are distributed on both sides of the first center surface F1 along the width direction X of the first wall. Each turn of the first electrode 231 has two first tabs 23c, which are used to form a first tab cluster 231a and two second tab clusters 231b, respectively. The two first tabs 23c can be located in the same straight section of the turn of the first electrode 231, or they can be located in two straight sections of the turn of the first electrode 231, respectively.

[0179] In the above scheme, the electrode assembly 23 has a wound structure, and each turn of the first electrode sheet 231 has two first tabs 23c. The two first tabs 23c are used to form the first tab cluster 231a and the second tab cluster 231b, respectively. The number of first tabs 23c forming the first tab cluster 231a and the number of first tabs 23c forming the second tab cluster 231b can be designed to be small, which is beneficial to reduce the space occupied by the first tab cluster 231a and the second tab cluster 231b in the thickness direction Z of the first wall, and to improve the space occupancy rate of the battery cell 20 in the thickness direction Z of the first wall, thereby improving the energy density of the battery cell 20.

[0180] Please refer to Figure 8 , Figure 8 This is a schematic diagram of the structure of a wound electrode assembly provided in some embodiments of this application. According to some embodiments of this application, the electrode assembly 23 includes a first central surface F1, which is perpendicular to the width direction X of the first wall; the first electrode tabs 23c constituting the first electrode tab cluster 231a and the first electrode tabs 23c constituting the second electrode tab cluster 231b are respectively located on both sides of the first central surface F1.

[0181] The first central plane F1 can be regarded as the central plane of the main body 23b, and the main body 23b as a whole can be roughly symmetrically distributed about the first central plane F1.

[0182] Along the width direction X of the first wall, the first pole ear 23c constituting the first pole ear cluster 231a is located on one side of the first central surface F1, and the first pole ear 23c constituting the second pole ear cluster 231b is located on the other side of the first central surface F1.

[0183] In the above scheme, the first center plane F1 is perpendicular to the width direction X of the first wall, and the winding axis of the electrode assembly 23 is within the first center plane F1. The first tab 23c constituting the first tab cluster 231a and the first tab 23c constituting the second tab cluster 231b are respectively located on both sides of the first center plane F1, so as to facilitate uniform current distribution, improve the overcurrent effect of multiple first tabs 23c, and thus improve the charging and discharging performance of the battery cell 20.

[0184] Please refer to Figure 9 , Figure 9 This is a schematic diagram of the structure of a stacked electrode assembly provided in some embodiments of this application. According to some embodiments of this application, the electrode assembly 23 has a stacked structure and includes a plurality of first electrode plates 231. Each first electrode plate 231 has at least two first electrode tabs 23c. At least one of the first electrode tabs 23c is used to form a first electrode tab cluster 231a, and at least another first electrode tab 23c is used to form a second electrode tab cluster 231b.

[0185] Each first electrode 231 has at least two first electrode tabs 23c, the at least two first electrode tabs 23c are distributed at intervals along the length direction Y of the first wall, and the at least two first electrode tabs 23c are respectively used to form a first electrode tab cluster 231a and a second electrode tab cluster 231b.

[0186] In the above scheme, compared with only one first tab 23c for each first electrode 231, at least two first tabs 23c for each first electrode 231 are used to form a first tab cluster 231a and a second tab cluster 231b, respectively, so that the total number of multiple first tabs 23c is larger, which is conducive to improving the overcurrent capacity of multiple first tabs 23c, thereby improving the charging and discharging performance of the battery cell 20.

[0187] Please refer to Figure 10 , Figure 10 This is a schematic diagram of the structure of a stacked electrode assembly provided in some other embodiments of this application. According to some embodiments of this application, the electrode assembly 23 has a stacked structure and includes a plurality of first electrode plates 231. Each first electrode plate 231 has a first electrode tab 23c. The first electrode tabs 23c of some of the plurality of first electrode plates 231 form a first electrode tab cluster 231a, and the first electrode tabs 23c of other parts of the plurality of first electrode plates 231 form a second electrode tab cluster 231b.

[0188] Each first electrode 231 has a first tab 23c, such that the first tab 23c is used only to form a tab cluster. The first tabs 23c of multiple first electrodes 231 respectively form a first tab cluster 231a and a second tab cluster 231b. In the case of an equal number of first tabs 23c, forming a first tab cluster 231a and a second tab cluster 231b with multiple first tabs 23c can make the current distribution of multiple first tabs 23c uniform.

[0189] In the above scheme, each first electrode 231 has a first tab 23c. The first tabs 23c of some first electrode 231 form a first tab cluster 231a, and the first tabs 23c of other first electrode 231 form a second tab cluster 231b. The number of first tabs 23c in each tab cluster is small, which can reduce the space occupied by each tab cluster in the thickness direction Z of the first wall, thereby improving the space utilization rate of the battery cell 20 in the thickness direction Z of the first wall, and thus improving the energy density of the battery cell 20.

[0190] Please refer to Figure 11 , Figure 11This is a schematic diagram of the structure of multiple electrode assemblies provided in some embodiments of this application. According to some embodiments of this application, the number of electrode assemblies 23 is at least four, and the at least four electrode assemblies 23 are arranged along the width direction X of the first wall; all the first tabs 23c of each electrode assembly 23 are used to form a first tab cluster 231a or a second tab cluster 231b.

[0191] The number of electrode assemblies 23 can be four. In each of the four electrode assemblies 23, all the first tabs 23c of each electrode assembly 23 are used to form a first tab cluster 231a or a second tab cluster 231b.

[0192] The number of electrode assemblies 23 can be six. In the six electrode assemblies 23, all the first tabs 23c of each electrode assembly 23 are used to form a first tab cluster 231a or a second tab cluster 231b, so that the six electrode assemblies 23 have two first tab clusters 231a and two second tab clusters 231b.

[0193] The number of electrode components 23 can be eight. Along the width direction X of the first wall, the eight electrode components 23 can form two groups of electrode components 23. Each group of electrode components 23 has four electrode components 23. The first tabs 23c of the four electrode components 23 in one group of electrode components 23 together form a first tab cluster 231a, and the other part of the first tabs 23c of the four electrode components 23 in this group of electrode components 23 together form a second tab cluster 231b. The first tabs 23c of the four electrode components 23 in the other group of electrode components 23 together form another first tab cluster 231a, and the other part of the first tabs 23c of the four electrode components 23 in this group of electrode components 23 together form another second tab cluster 231b.

[0194] In the above scheme, the number of electrode components 23 is at least four, and the battery cell 20 has a high power capacity; all first tab clusters 231a are formed by at least one of all electrode components 23, and all second tab clusters 231b are formed by at least another of all electrode components 23. The first tab clusters 231a and the second tab clusters 231b are spaced apart in the length direction Y of the first wall so as to make use of the space inside the battery cell 20 in the length direction Y of the first wall. The distance between the first tab clusters 231a and the second tab clusters 231b can be designed to be relatively far, thereby reducing the risk of increased internal resistance due to the distance between the first tab clusters 231a and the second tab clusters 231b being too close, which is conducive to improving the charging and discharging performance and service life of the battery cell 20.

[0195] According to some embodiments of this application, the electrode assembly 23 has a wound structure. The electrode assembly 23 includes a first electrode sheet 231. Each turn of the first electrode sheet 231 has a first electrode tab 23c. The first electrode tab 23c is used to form a first electrode tab cluster 231a or a second electrode tab cluster 231b.

[0196] The first tab 23c in each electrode assembly 23 is used to form a first tab cluster 231a or a second tab cluster 231b, such that all the first tabs 23c of a portion of the multiple electrode assemblies 23 form a first tab cluster 231a, and all the first tabs 23c of another portion of the multiple electrode assemblies 23 form a second tab cluster 231b.

[0197] In the above scheme, each first electrode sheet 231 has a first tab 23c, and the first tab 23c of each electrode assembly 23 constitutes a first tab cluster 231a or a second tab cluster 231b, so that the thickness of the first tab cluster 231a and the thickness of the second tab cluster 231b can be designed to be small, which is conducive to reducing the space occupied by the first tab cluster 231a and the second tab cluster 231b in the thickness direction Z of the first wall, which is beneficial to improving the space utilization rate of the battery cell 20 in the thickness direction Z of the first wall, thereby improving the energy density of the battery cell 20.

[0198] Please refer to Figure 8 According to some embodiments of this application, the electrode assembly 23 includes a first central surface F1, which is perpendicular to the width direction X of the first wall; the electrode assembly 23 is a wound structure, and the electrode assembly 23 includes a first electrode sheet 231. Each turn of the first electrode sheet 231 has two first electrode tabs 23c, which are located on both sides of the first central surface F1, and are used to form a first electrode tab cluster 231a or a second electrode tab cluster 231b.

[0199] Each electrode assembly 23 has a first center surface F1. When the electrode assembly 23 is a wound structure, the two first tabs 23c of each turn of the first electrode sheet 231 are spaced apart along the width direction X of the first wall and located on both sides of the first center surface F1. The two first tabs 23c are used to form a first tab cluster 231a or a second tab cluster 231b, so that all the first tabs 23c of a part of the multiple electrode assemblies 23 form a first tab cluster 231a, and all the first tabs 23c of another part of the multiple electrode assemblies 23 form a second tab cluster 231b.

[0200] In the above scheme, each first electrode 231 has two first tabs 23c, and the two first tabs 23c are located on both sides of the first center plane F1, so that each tab cluster has a large number of first tabs 23c, each tab cluster can have a large current carrying capacity, so that multiple first tabs 23c have a high current carrying capacity, which can improve the charging and discharging performance of the battery cell 20.

[0201] Please refer to Figure 12 , Figure 12 This is a schematic diagram of the structure of a wound electrode assembly provided in some other embodiments of this application. According to some embodiments of this application, the electrode assembly 23 includes a first center surface F1, which is perpendicular to the width direction X of the first wall; the electrode assembly 23 is a wound structure, and the electrode assembly 23 includes a first electrode sheet 231. Each turn of the first electrode sheet 231 has two first electrode tabs 23c, which are located on the same side of the first center surface F1, and are used to form a first electrode tab cluster 231a or a second electrode tab cluster 231b, respectively.

[0202] In the above scheme, the two first tabs 23c of each first electrode plate 231 are located on the same side of the first center plane F1, and the two first tabs 23c are located in the same straight section, which is convenient for processing and manufacturing.

[0203] According to some embodiments of this application, the electrode assembly 23 has a stacked structure and includes a plurality of first electrode plates 231. Each first electrode plate 231 has a first electrode tab 23c, which is used to form a first electrode tab cluster 231a or a second electrode tab cluster 231b.

[0204] Each first electrode 231 has a first tab 23c, which is used to form a first tab cluster 231a or a second tab cluster 231b, such that all the first tabs 23c of a portion of the multiple electrode assemblies 23 form a first tab cluster 231a, and all the first tabs 23c of another portion of the multiple electrode assemblies 23 form a second tab cluster 231b.

[0205] In the above scheme, while meeting the overcurrent requirements, each first electrode 231 has a first tab 23c, which helps to reduce the internal resistance of the battery cell 20 and improve the charging and discharging performance of the battery cell 20.

[0206] Please refer to Figure 13 and Figure 14 , Figure 13 This is a cross-sectional view of a battery cell provided in some embodiments of this application. Figure 14 for Figure 13A partial enlarged view at point A. According to some embodiments of this application, the electrode assembly 23 further includes a main body 23b, a plurality of first electrode tabs 23c extending from the main body 23b, and a first electrode lead-out component 22 including a first electrode terminal 22d and a first adapter 22e connected to each other. The first electrode terminal 22d is disposed on the first wall 211, at least a portion of the first electrode terminal 22d is located on the outside of the first wall 211, at least a portion of the first adapter 22e is located on the inside of the first wall 211, and the first adapter 22e is disposed between the first wall 211 and the main body 23b. Two first electrode tab clusters 231a and two second electrode tab clusters 231b are electrically connected to the first adapter 22e, respectively.

[0207] The first electrode terminal 22d and the first adapter 22e are separately configured. When assembling the battery cell 20, the first electrode terminal 22d can be integrated into the first wall 211 first, then the first adapter 22e can be welded to the first electrode terminal 22d, and then the first tab cluster 231a and the second tab cluster 231b can be welded to the first adapter 22e respectively to complete the assembly of multiple first tabs 23c and the first electrode lead-out component 22.

[0208] In some embodiments, the entire first electrode terminal 22d is located outside the first wall 211, a portion of the first adapter 22e is located inside the first electrode lead-out hole 211a and connected to the first electrode terminal 22d, and another portion of the first adapter 22e is located inside the first wall 211 and connected to the first tab cluster 231a and the second tab cluster 231b.

[0209] In some embodiments, a portion of the first electrode terminal 22d is located on the outer side of the first wall 211, and a portion of the first electrode terminal 22d may be disposed within the first electrode lead-out hole 211a of the first wall 211. The first adapter 22e is located on the inner side of the first wall 211, and the first adapter 22e is connected to the first electrode terminal 22d through the first electrode lead-out hole 211a. For example, a portion of the first electrode terminal 22d passes through the first electrode lead-out hole 211a and is connected to the first adapter 22e; or, a portion of the first electrode terminal 22d is disposed within the first electrode lead-out hole 211a, and a portion of the first adapter 22e is also disposed within the first electrode lead-out hole 211a and connected to the first electrode terminal 22d.

[0210] In some embodiments, the first electrode cluster 231a and the second electrode cluster 231b are respectively connected to the first adapter 22e by ultrasonic welding, and the first adapter 22e is connected to the first electrode terminal 22d by laser welding.

[0211] In the above scheme, the first electrode terminal 22d is disposed on the first wall 211, and at least a portion of the first electrode terminal 22d is located on the outside of the first wall 211 so as to facilitate electrical connection with a conductive component (such as a busbar) outside the battery cell 20; at least a portion of the first adapter 22e is located on the inside of the first wall 211 so as to facilitate connection of the first adapter 22e with the first tab cluster 231a and the second tab cluster 231b.

[0212] Please refer to Figure 14 According to some embodiments of this application, the thickness of the first adapter 22e is T, which satisfies 0.4mm≤T≤2.5mm.

[0213] The thickness of the first adapter 22e can be measured with a micrometer.

[0214] In this embodiment, the thickness of the first adapter 22e refers to the thickness of the area where the first adapter 22e connects to the first tab cluster 231a and the second tab cluster 231b.

[0215] If the thickness of the first adapter 22e is too thin, the first adapter 22e cannot carry too much current, affecting the overcurrent capacity of the first adapter 22e; if the thickness of the first adapter 22e is too thick, the first adapter 22e occupies too much space in the thickness direction Z of the first wall, the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall is low, and the energy density of the battery cell 20 is low.

[0216] In the above scheme, since the first tab cluster 231a and the second tab cluster 231b are located on both sides of the first center line C1, the multiple first tabs 23c have a high current carrying capacity. The thickness of the first adapter 22e can be designed to be smaller. For example, the thickness of the first adapter 22e can be designed to be greater than or equal to 0.4mm and less than or equal to 2.5mm. Under the condition that the first adapter 22e is reliably connected to the first tab cluster 231a, the second tab cluster 231b and the first electrode terminal 22d, it is convenient to save the space inside the battery cell 20 in the thickness direction Z of the first wall, which is conducive to improving the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall, so that the battery cell 20 has a higher energy density.

[0217] In some embodiments, the thickness T of the first adapter 22e can be, but is not limited to, any one or a range between any two of 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or 2.5mm.

[0218] Optionally, 0.6mm≤T≤1.2mm.

[0219] Please refer to Figure 14 According to some embodiments of this application, the first adapter 22e includes a first connection area 22f and a second connection area 22g, a first electrode cluster 231a and a second electrode cluster 231b are connected to the first connection area 22f, a first electrode terminal 22d is connected to the second connection area 22g, and the thickness of the first connection area 22f is less than the thickness of the second connection area 22g.

[0220] The first connection area 22f is the area of ​​the first adapter 22e that connects the first electrode cluster 231a and the second electrode cluster 231b, and the second connection area 22g is the area of ​​the first adapter 22e that connects the first electrode terminal 22d.

[0221] Since the two first electrode clusters 231a and the two second electrode clusters 231b are located on both sides of the first center line C1 along the length direction Y of the first wall, the two first electrode clusters 231a are located on both sides of the first center line C1 along the width direction X of the first wall, and the two second electrode clusters 231b are located on both sides of the first center line C1 along the width direction X of the first wall, the current flowing through the first electrode clusters 231a and the current flowing through the second electrode clusters 231b converge in the second connection region 22g and flow to the first electrode terminal 22d. Therefore, the current carrying capacity of the second connection region 22g is greater than that of the first connection region 22f. In order to carry a larger current, the thickness of the second connection region 22g needs to be designed to be greater than the thickness of the first connection region 22f. Therefore, while meeting the overcurrent requirements, the thickness of the first connection area 22f can be designed to be smaller to reduce the space occupied by the first connection area 22f in the thickness direction Z of the first wall; at the same time, since the first electrode terminal 22d and the second connection area 22g are connected through the first electrode lead-out hole 211a, the thickness of the second connection area 22g can be designed to be larger to meet the overcurrent requirements, and the space occupied by the first electrode lead-out hole 211a in the thickness direction Z of the first wall can be utilized to reduce the space occupied by the battery cell 20 in the thickness direction Z of the first wall.

[0222] In the above scheme, compared to multiple first tabs 23c forming a tab cluster, multiple first tabs 23c forming two first tab clusters 231a and two second tab clusters 231b, while meeting the overall overcurrent requirements, the current flowing through each first tab cluster 231a and the current flowing through each second tab cluster 231b can be designed to be smaller. This allows the thickness of the first connection area 22f connected to each first tab cluster 231a and each second tab cluster 231b to be smaller, so as to reduce the space occupation of the first connection area 22f in the thickness direction Z of the first wall, improve the space utilization rate of the battery cell 20 in the thickness direction Z of the first wall, and improve the energy density of the battery cell 20.

[0223] Please refer to Figure 5 and Figure 14 According to some embodiments of this application, each first tab cluster 231a forms a first solder mark H1 with the first adapter 22e, and the two first solder marks H1 are respectively located on both sides of the first center line C1 along the width direction X of the first wall; each second tab cluster 231b forms a second solder mark H2 with the first adapter 22e, and the two second solder marks H2 are respectively located on both sides of the first center line C1 along the width direction X of the first wall.

[0224] In the above scheme, the two first solder marks H1 are located on both sides of the first center line C1 along the width direction X of the first wall, and the two second solder marks H2 are located on both sides of the first center line C1 along the width direction X of the first wall. The two first solder marks H1 and the two second solder marks H2 are located on both sides of the first center line C1 along the length direction Y of the first wall. This makes the current distribution at each solder mark less, and the thickness of the first adapter 22e at each solder mark can be designed to be thinner. This allows the structure after each tab cluster is connected to the first adapter 22e to occupy less space in the thickness direction Z of the first wall, which is beneficial to improving the space utilization rate of the battery cell 20 in the thickness direction Z of the first wall, thereby improving the energy density of the battery cell 20.

[0225] Please refer to Figure 14 and further refer to Figure 15 , Figure 15 This is a schematic diagram illustrating the connection state of two first electrode clusters and two second electrode clusters with a first adapter according to some embodiments of this application. According to some embodiments of this application, the first adapter 22e is provided with a first notch K1 and a second notch K2. The first notch K1 and the second notch K2 are respectively located at both ends of the first adapter 22e along the length direction Y of the first wall and along the width direction X of the first wall. The first notch K1 is located between two first solder marks H1, and the second notch K2 is located between two second solder marks H2.

[0226] The first notch K1 and the second notch K2 can be the cut-off areas at both ends of the first adapter 22e in the length direction Y of the first wall.

[0227] In the above scheme, the setting of the first notch K1 and the second notch K2 can reduce the weight of the first adapter 22e, which is conducive to reducing the overall weight of the battery cell 20; at the same time, the first notch K1 and the second notch K2 can also facilitate the assembly and positioning of the first adapter 22e and improve assembly efficiency.

[0228] Please refer to Figure 16 , Figure 16 This is a schematic diagram illustrating the assembly of the first electrode tab cluster and the second electrode tab cluster with the first electrode lead-out component, provided for some embodiments of this application. According to some embodiments of this application, the first electrode lead-out component 22 includes a first electrode terminal 22d, a portion of which is located within the first electrode lead-out hole 211a, and another portion of which is located inside the first wall 211 and connected to the first electrode tab cluster 231a and the second electrode tab cluster 231b.

[0229] The first electrode cluster 231a and the second electrode cluster 231b are directly connected to the first electrode terminal 22d, which penetrates the first wall 211, such that one end of the first electrode terminal 22d is located on the outside of the first wall 211 and the other end is located on the inside of the first wall 211.

[0230] In the above scheme, the first electrode terminal 22d passes through the first electrode lead-out hole 211a. The two ends of the first electrode terminal 22d are located on the outer and inner sides of the first wall 211, respectively. The portion of the first electrode terminal 22d located on the inner side of the first wall 211 is connected to the first tab cluster 231a and the second tab cluster 231b. This reduces the number of components in the battery cell 20, making the battery cell 20 structure simple and reducing manufacturing costs. At the same time, the thickness of the portion of the first electrode terminal 22d inside the battery cell 20 can be designed to be thinner, so as to reduce the space occupied by the portion of the first electrode terminal 22d inside the battery cell 20 in the thickness direction Z of the first wall. This is beneficial to improving the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall, and thus facilitating the improvement of the energy density of the battery cell 20.

[0231] Please refer to Figure 17 , Figure 17This is a schematic diagram of the assembly of the first electrode cluster and the second electrode cluster with the first electrode lead-out component, provided for other embodiments of this application. According to some embodiments of this application, the first electrode lead-out component 22 includes a first connecting portion 221 and a second connecting portion 222 connected to each other. The first connecting portion 221 is connected to the first electrode tab cluster 231a, and the second connecting portion 222 is connected to the second electrode tab cluster 231b. The electrode assembly 23 also includes a main body portion 23b, and a plurality of first electrode tabs 23c extend from the main body portion 23b. The first wall 211 includes a first region 211b and a second region 211c. The first region 211b includes a first inner surface 211d facing the main body portion 23b, and the second region 211c includes a second inner surface 211e facing the main body portion 23b. Along the thickness direction Z of the first wall, the second inner surface 211e is further away from the main body portion 23b than the first inner surface 211d. At least a portion of the first connecting portion 221 is located between the second inner surface 211e and the first inner surface 211d, and the second connecting portion 222 is located on the side of the first inner surface 211d facing the main body portion 23b.

[0232] The first connecting part 221 is the part of the first electrode lead-out component 22 used to connect with the first electrode tab cluster 231a, and the second connecting part 222 is the part of the second electrode lead-out component used to connect with the second electrode tab cluster 231b.

[0233] The first connecting part 221 and the first electrode cluster 231a can be welded together. For example, the first connecting part 221 and the first electrode cluster 231a can be welded together by ultrasonic welding, or the first connecting part 221 and the first electrode cluster 231a can be welded together by laser welding, so that the first connecting part 221 and the first electrode cluster 231a are firmly connected, which facilitates the flow of current between the first connecting part 221 and the first electrode cluster 231a.

[0234] The second connecting part 222 and the second electrode cluster 231b can be welded together. For example, the second connecting part 222 and the second electrode cluster 231b can be welded together by ultrasonic welding, or the second connecting part 222 and the second electrode cluster 231b can be welded together by laser welding, so that the second connecting part 222 and the second electrode cluster 231b are firmly connected, which facilitates the flow of current between the second connecting part 222 and the second electrode cluster 231b.

[0235] The first wall 211 also includes a first transition surface 211f, which connects the first inner surface 211d and the second inner surface 211e.

[0236] The first region 211b and the second region 211c are two regions of the first wall 211. Along the thickness direction Z of the first wall, the second inner surface 211e of the second region 211c is further away from the main body 23b than the first inner surface 211d of the first region 211b. This causes the second inner surface 211e, the first inner surface 211d, and the first transition surface 211f to form a step. For example, on the side of the first wall 211 facing the main body 23b, a portion of the first wall 211 is removed to form this step. Because the second inner surface 211e is further away from the main body 23b than the first inner surface 211d, the space inside the battery cell 20 in the thickness direction Z of the first wall can be increased, allowing the space between the second inner surface 211e and the first inner surface 211d to accommodate at least a portion of the first connecting portion 221. When the distance between the second inner surface 211e and the main body 23b is large, the space between the second inner surface 211e and the first inner surface 211d can also accommodate the part of the first pole tab cluster 231a connected to the first connecting part 221. That is, the part of the first pole tab cluster 231a used to connect with the first connecting part 221 can be located in the space between the second inner surface 211e and the first inner surface 211d.

[0237] The first region 211b also includes a first outer surface that is away from the main body 23b, and the first outer surface and the first inner surface 211d are disposed opposite each other in the thickness direction Z of the first wall; the second region 211c also includes a second outer surface that is away from the main body 23b, and the second outer surface and the second inner surface 211e are disposed opposite each other in the thickness direction Z of the first wall, and the thickness directions of the first region 211b and the second region 211c are both parallel to the thickness direction Z of the first wall.

[0238] In some embodiments, the first outer surface may be coplanar with the second outer surface, and the thickness of the first region 211b is greater than the thickness of the second region 211c.

[0239] In other embodiments, the second outer surface may be further away from the main body 23b relative to the first outer surface, and the first wall 211 may also include a second transition surface connecting the first and second outer surfaces, and the second region 211c may be further away from the main body 23b relative to the first region 211b. For example, the first wall 211 may be formed by stamping the first region 211b and the second region 211c via a plate-like structure.

[0240] The second connecting portion 222 is located on the side of the first inner surface 211d facing the main body portion 23b, and the first connecting portion 221 is further away from the main body portion 23b relative to the second connecting portion 222. In some embodiments, the first connecting portion 221 and the second connecting portion 222 are arranged parallel to each other, and the first electrode lead-out component 22 further includes a third connecting portion, which is correspondingly arranged with the first transition surface 211f, and the third connecting portion connects the first connecting portion 221 and the second connecting portion 222.

[0241] In some embodiments, please refer to Figure 13 The electrode assembly 23 has a second center surface F2, which is perpendicular to the length direction Y of the first wall. Along the length direction Y of the first wall, all the first tabs 23c are located on the same side of the second center surface F2. Along the length direction Y of the first wall, the second tab cluster 231b is closer to the second center surface F2 than the first tab cluster 231a.

[0242] In the above scheme, the second inner surface 211e is further away from the main body 23b than the first inner surface 211d. The space formed between the first inner surface 211d and the second inner surface 211e can increase the space inside the battery cell 20 in the thickness direction Z of the first wall, so that the thickness of the first connecting part 221 can be thicker, and / or the number of first tabs 23c of the first tab cluster 231a can be larger, so as to improve the current flow capacity between the first tab cluster 231a and the first connecting part 221 and improve the charging and discharging performance of the battery cell 20.

[0243] According to some embodiments of this application, the number of first electrodes 23c constituting the first electrode cluster 231a is greater than the number of first electrodes 23c constituting the second electrode cluster 231b.

[0244] The number of first tabs 23c in the first tab cluster 231a is greater than the number of first tabs 23c in the second tab cluster 231b. Compared with the second tab cluster 231b, the first tab cluster 231a has a higher current carrying capacity.

[0245] In the above scheme, by designing the number of first tabs 23c constituting the first tab cluster 231a to be greater than the number of first tabs 23c constituting the second tab cluster 231b, the space between the first inner surface 211d and the second inner surface 211e can be utilized to improve the overcurrent capacity between the first tab cluster 231a and the first connection portion 221, thereby improving the charge and discharge performance of the battery cell 20.

[0246] According to some embodiments of this application, the thickness of the first connecting portion 221 is greater than the thickness of the second connecting portion 222.

[0247] The thickness of the first connecting portion 221 is greater than the thickness of the second connecting portion 222. Compared with the second connecting portion 222, the first connecting portion 221 has a higher current carrying capacity.

[0248] In the above scheme, by designing the thickness of the first connecting part 221 to be greater than the thickness of the second connecting part 222, the space between the first inner surface 211d and the second inner surface 211e can be utilized to improve the current carrying capacity of the first connecting part 221 and facilitate meeting the fast charging requirements.

[0249] Please refer to Figure 3 According to some embodiments of this application, each electrode assembly 23 includes a body portion 23b having a first end D1 facing the first wall 211, and a plurality of first tabs 23c extending from the first end D1.

[0250] In the above scheme, multiple first tabs 23c extend from the first end D1, utilizing the space between the first wall 211 and the main body 23b to improve the space utilization rate inside the battery cell 20. Furthermore, the extension length of the first tabs 23c can be designed to be relatively small, reducing the risk of the first tabs 23c in the wound electrode assembly 23 being flipped, which facilitates the improvement of the yield and reliability of the battery cell 20.

[0251] Please refer to Figure 3 , Figure 6 , Figure 7 and Figure 13 and further refer to Figure 18 and Figure 19 , Figure 18 for Figure 13 A magnified view of part B. Figure 19This is a schematic diagram illustrating the connection state of two first electrode tab clusters and two second electrode tab clusters with a second electrode lead-out component, provided for some embodiments of this application. According to some embodiments of this application, a first wall 211 is provided with a second electrode lead-out hole 211g, which is spaced apart from the first electrode lead-out hole 211a along the length direction Y of the first wall. The second electrode lead-out hole 211g has a second center line C2, which is parallel to the thickness direction Z of the first wall. The battery cell 20 also includes a second electrode lead-out component 24, a portion of which is disposed within the second electrode lead-out hole 211g, and a portion of which is located inside the first wall 211. The electrode assembly 23 also includes a plurality of second electrode tabs 23d, the polarity of which is opposite to that of all first electrode tabs 23c. The plurality of second electrode tabs 23d extend from a first end D1. In all electrode assemblies 23... Two third electrode clusters 232a are formed in a portion of the second electrode tab 23d, and two fourth electrode clusters 232b are formed in another portion of the second electrode tab 23d in all electrode assemblies 23. The two third electrode clusters 232a and the two fourth electrode clusters 232b are arranged at intervals along the length direction Y of the first wall. The two third electrode clusters 232a are located on one side of the second center line C2, and the two fourth electrode clusters 232b are located on the other side of the second center line C2. The two third electrode clusters 232a and the two fourth electrode clusters 232b are electrically connected to the second electrode lead-out component 24, respectively. The two third electrode clusters 232a are located on both sides of the second center line C2 along the width direction X of the first wall, and the two fourth electrode clusters 232b are located on both sides of the second center line C2 along the width direction X of the first wall.

[0252] The electrode assembly 23 further includes a second electrode 232, the polarity of which is opposite to that of the first electrode 231. The second electrode 232 includes a second current collector and a second active material layer. The second current collector includes a second main body region and a second tab 23d. The second active material layer is disposed in the second main body region, while the second tab 23d does not have a second active material layer. The second main body region with the second active material layer constitutes a part of the main body portion 23b.

[0253] The electrode assembly 23 has a second center surface F2, which is perpendicular to the length direction Y of the first wall. Along the length direction Y of the first wall, all the first tabs 23c and all the second tabs 23d are located on both sides of the second center surface F2 to reduce the risk of short circuit between the first tabs 23c and the second tabs 23d, and to facilitate the connection of the first tabs 23c to the first electrode lead-out component 22 and the second tabs 23d to the second electrode lead-out component 24.

[0254] A portion of the second electrodes 23d are stacked to form two third electrode clusters 232a. The multiple second electrodes 23d in each third electrode cluster 232a are electrically connected to form a whole.

[0255] A portion of the second electrodes 23d are stacked to form two fourth electrode clusters 232b. The multiple second electrodes 23d in each fourth electrode cluster 232b are electrically connected to form a whole.

[0256] Two third pole ear clusters 232a and two fourth pole ear clusters 232b are arranged at intervals along the length direction Y of the first wall. On the same projection plane perpendicular to the width direction X of the first wall, the orthographic projections of the two third pole ear clusters 232a overlap at least partially, the orthographic projections of the two fourth pole ear clusters 232b overlap at least partially, and the orthographic projections of the third pole ear clusters 232a and the fourth pole ear clusters 232b do not overlap.

[0257] In some embodiments, each third electrode cluster 232a is welded to the second electrode lead-out component 24 to form a third solder mark H3, and each fourth electrode cluster 232b is welded to the second electrode lead-out component 24 to form a fourth solder mark H4; the two third solder marks H3 are respectively located on both sides of the second center line C2 along the width direction X of the first wall, and the two fourth solder marks H4 are respectively located on both sides of the second center line C2 along the width direction X of the first wall.

[0258] In the above scheme, along the thickness direction Z of the first wall, all the second tabs 23d and all the first tabs 23c are located on the same side of the main body 23b, so as to facilitate the input or output of electrical energy of the electrode assembly 23 on the same side of the battery cell 20; the second tabs 23d of all the electrode assemblies 23 form two third tab clusters 232a and two fourth tab clusters 232b. By respectively setting the two third tab clusters 232a and the two fourth tab clusters 232b on both sides of the second center line C2 of the second electrode lead-out hole 211g along the length direction Y of the first wall, the current flowing through the second electrode lead-out component 24 is distributed on both sides of the second center line C2. The two third tab clusters 232a are respectively located on both sides of the second center line C2 along the thickness direction Z of the first wall. On both sides of the width direction X of the first wall, two fourth tab clusters 232b are respectively located on both sides of the second center line C2 along the width direction X of the first wall, so as to facilitate uniform current distribution and improve the overcurrent effect. The number of second tabs 23d in each tab cluster can be designed to be smaller, reducing the space occupied by multiple second tabs 23d in the thickness direction Z of the first wall, improving the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall, thereby improving the energy density of the battery cell 20. In addition, the smaller number of second tabs 23d in each tab cluster can also reduce the welding power when welding the tab cluster to the second electrode lead-out component 24, reducing the damage to the second tabs 23d during welding, and improving the reliability of the battery cell 20.

[0259] In this application, the configuration of multiple second electrodes 23d can refer to the configuration of multiple first electrodes 23c, and will not be described in detail here.

[0260] In some embodiments, please refer to Figure 4 An insulating member 25 may be provided between the first electrode lead-out component 22 and the first wall 211 to insulate and isolate the first electrode lead-out component 22 and the first wall 211, reducing the risk of short circuit between the positive and negative electrodes. A sealing member 26 is provided between the first electrode lead-out component 22 and the first wall 211, and the sealing member 26 is arranged around the first electrode lead-out hole 211a to ensure a sealed fit between the first electrode lead-out component 22 and the first wall 211, reducing the risk of electrolyte leakage from the first electrode lead-out hole 211a.

[0261] According to some embodiments of this application, please refer to Figure 6 and Figure 7 The electrode assembly 23 includes a flat region 23a, and the electrode sheets of the electrode assembly 23 are stacked in the flat region 23a along the width direction X of the first wall.

[0262] In the above scheme, the electrode sheets of the electrode assembly 23 are stacked in the flat region 23a along the width direction of the first wall, and the thickness direction of the battery cell 20 is parallel to the width direction X of the first wall.

[0263] According to the above embodiments, the battery cell 20 has high charge and discharge performance, and the charge and discharge rate of the battery cell 20 can be greater than or equal to 2C and less than or equal to 10C to meet the fast charging requirements.

[0264] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 provided according to any of the above embodiments.

[0265] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 provided according to any of the above embodiments, the battery cell 20 being used to provide electrical energy; or, the electrical device includes a battery device 100 provided according to any of the above embodiments, the battery device 100 being used to provide electrical energy.

[0266] The electrical device can be any of the above-mentioned devices or equipment that use a single battery cell 20 or a battery device 100.

[0267] According to some embodiments of this application, please refer to Figures 3 to 19 This application provides a battery cell 20, which is cuboid in shape. The battery cell 20 includes a housing 21, a plurality of electrode assemblies 23, a first electrode lead-out component 22, and a second electrode lead-out component 24.

[0268] The outer casing 21 includes a housing 21a and an end cap 21b. The housing 21a has an opening, and the end cap 21b closes the opening. The end cap 21b is a first wall 211. The first wall 211 is provided with a first electrode lead-out hole 211a and a second electrode lead-out hole, which are spaced apart along the length direction Y of the first wall.

[0269] A first electrode lead-out component 22 is disposed on the first wall 211, with a portion of the first electrode lead-out component 22 located on the outside of the first wall 211. This portion of the first electrode lead-out component 22 passes through the first electrode lead-out hole 211a and extends into the battery cell 20. A second electrode lead-out component 24 is disposed on the first wall 211, with a portion of the second electrode lead-out component 24 located on the outside of the first wall 211. This portion of the second electrode lead-out component 24 passes through the second electrode lead-out hole and extends into the battery cell 20. The first electrode lead-out hole 211a has a first center line C1, and the second electrode lead-out hole 211g has a second center line C2.

[0270] Multiple electrode assemblies 23 are disposed within the housing 21. Each electrode assembly 23 includes a first electrode 231 and a second electrode 232 with opposite polarities. Each electrode assembly 23 includes a flat region 23a, in which the first electrode 231 and the second electrode 232 are stacked along the width direction X of the first wall. Each electrode assembly 23 includes a main body 23b, multiple first tabs 23c, and multiple second tabs 23d, all extending from a first end D1 of the main body 23b. A portion of the first tabs 23c in all electrode assemblies 23 is stacked to form two first tab clusters 231a, and another portion of the first tabs 23c in all electrode assemblies 23 is stacked to form two second tab clusters 231b. The first tab clusters 231a and 231b are arranged at intervals along the length direction Y of the first wall, and are electrically connected to the first electrode lead-out component 22. Two first pole ear clusters 231a are located on both sides of the first center line C1 along the width direction X of the first wall, and two second pole ear clusters 231b are located on both sides of the first center line C1 along the width direction X of the first wall.

[0271] In all electrode assemblies 23, a portion of the second tabs 23d are stacked to form two third tab clusters 232a, and another portion of the second tabs 23d are stacked to form two fourth tab clusters 232b. The third tab clusters 232a and 232b are arranged at intervals along the length direction Y of the first wall, and are electrically connected to the second electrode lead-out component 24. The two third tab clusters 232a are located on both sides of the second center line C2 along the width direction X of the first wall, and the two fourth tab clusters 232b are located on both sides of the second center line C2 along the width direction X of the first wall. The electrode assembly 23 has a second center surface F2. Along the length direction Y of the first wall, all the first tabs 23c are located on one side of the second center surface F2, and all the second tabs 23d are located on the other side of the second center surface F2.

[0272] Along the length direction Y of the first wall, the first anode cluster 231a, the second anode cluster 231b, the third anode cluster 232a, and the fourth anode cluster 232b are distributed sequentially. The first anode cluster 231a is located on one side of the first center line C1, and the second anode cluster 231b is located on the other side of the first center line C1. The third anode cluster 232a is located on one side of the second center line C2, and the fourth anode cluster 232b is located on the other side of the second center line C2.

[0273] By placing the first tab cluster 231a and the second tab cluster 231b on both sides of the first center line C1 along the length direction Y of the first wall of the first electrode lead-out hole 211a, the current flowing through the first electrode lead-out component 22 is distributed on both sides of the first center line C1. While meeting the overcurrent requirements, the thickness of the portion of the first electrode lead-out component 22 connecting the first tab cluster 231a and the portion connecting the second tab cluster 231b can be designed to be thinner. This reduces the space occupied by the portions of the first electrode lead-out component 22 connecting the first tab cluster 231a and the second tab cluster 231b in the thickness direction Z of the first wall, thereby improving the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall and thus increasing the energy density of the battery cell 20. By placing the third tab cluster 232a and the fourth tab cluster 232b on both sides of the second center line C2 of the second electrode lead-out hole 211g along the length direction Y of the first wall, the current flowing through the second electrode lead-out component 24 is distributed on both sides of the second center line C2. While meeting the overcurrent requirements, the thickness of the portion of the second electrode lead-out component 24 connecting the third tab cluster 232a and the portion connecting the fourth tab cluster 232b can be designed to be thinner. This reduces the space occupied by the portions of the second electrode lead-out component 24 connecting the third tab cluster 232a and the fourth tab cluster 232b in the thickness direction Z of the first wall, thereby improving the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall and thus increasing the energy density of the battery cell 20.

[0274] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a first wall, the first wall being provided with a first electrode lead-out hole, the first electrode lead-out hole having a first center line, the first center line being parallel to the thickness direction of the first wall; A first electrode lead-out component is disposed on the first wall, a portion of the first electrode lead-out component is disposed in the first electrode lead-out hole, and a portion of the first electrode lead-out component is located on the inner side of the first wall; At least one electrode assembly is disposed within the housing. Each electrode assembly includes a plurality of first tabs of the same polarity. A portion of the first tabs in all electrode assemblies are stacked to form two first tab clusters, and another portion of the first tabs in all electrode assemblies are stacked to form two second tab clusters. Along the length direction of the first wall, the two first tab clusters and the two second tab clusters are arranged at intervals. The two first tab clusters are located on one side of the first center line, and the two second tab clusters are located on the other side of the first center line. The two first tab clusters and the two second tab clusters are electrically connected to the first electrode lead-out component, respectively. The two first tab clusters are located on both sides of the first center line along the width direction of the first wall, and the two second tab clusters are located on both sides of the first center line along the width direction of the first wall.

2. The battery cell according to claim 1, characterized in that, Each of the first tab clusters is welded to the first electrode lead-out component to form a first solder mark, and the two first solder marks are respectively located on both sides of the first center line along the width direction of the first wall; Each of the second electrode tabs is welded to the first electrode lead-out component to form a second solder mark, and the two second solder marks are respectively located on both sides of the first center line along the width direction of the first wall.

3. The battery cell according to claim 1 or 2, characterized in that, At least one portion of the first tab in the electrode assembly is used to form the first tab cluster, and at least another portion of the first tab in the electrode assembly is used to form the second tab cluster.

4. The battery cell according to claim 3, characterized in that, The battery cell includes a plurality of the electrode components.

5. The battery cell according to claim 4, characterized in that, The battery cell includes two electrode assemblies, which are arranged along the width of the first wall; each electrode assembly has a first tab cluster and a second tab cluster.

6. The battery cell according to claim 4, characterized in that, The battery cell includes four electrode assemblies, which are arranged along the width of the first wall. The first tabs of two electrode assemblies on the side closest to the width direction of the first wall together form a first tab cluster, and the first tabs of the other two electrode assemblies on the side closest to the width direction of the first wall together form a second tab cluster. The portions of the first tabs of the two electrode assemblies on the other side of the width direction near the first wall together form another first tab cluster, and the portions of the first tabs of the two electrode assemblies on the other side of the width direction near the first wall together form another second tab cluster.

7. The battery cell according to any one of claims 3-6, characterized in that, The electrode assembly has a wound structure, and the electrode assembly includes a first electrode sheet, a portion of which is wound around the first electrode sheet to form a first electrode tab cluster, and another portion of which is wound around the first electrode sheet to form a second electrode tab cluster.

8. The battery cell according to any one of claims 3-6, characterized in that, The electrode assembly has a wound structure, and the electrode assembly includes a first electrode sheet. Each turn of the first electrode sheet has two first electrode tabs. One of the two first electrode tabs is used to form a first electrode tab cluster, and the other of the two first electrode tabs is used to form a second electrode tab cluster.

9. The battery cell according to claim 7 or 8, characterized in that, The electrode assembly includes a first central surface, which is perpendicular to the width direction of the first wall; The first electrode ear constituting the first electrode ear cluster and the first electrode ear constituting the second electrode ear cluster are respectively located on both sides of the first central surface.

10. The battery cell according to any one of claims 3-6, characterized in that, The electrode assembly is a stacked structure, and the electrode assembly includes a plurality of first electrodes, each of which has at least two first tabs. At least one of the first tabs is used to form a first tab cluster, and at least another of the first tabs is used to form a second tab cluster.

11. The battery cell according to any one of claims 3-6, characterized in that, The electrode assembly has a stacked structure and includes multiple first electrodes. Each first electrode has a first tab. The first tabs of some of the multiple first electrodes form a first tab cluster, and the first tabs of other parts of the multiple first electrodes form a second tab cluster.

12. The battery cell according to claim 1 or 2, characterized in that, The number of electrode assemblies is at least four, and the at least four electrode assemblies are arranged along the width direction of the first wall; All of the first tabs in each of the electrode assemblies are used to form either the first tab cluster or the second tab cluster.

13. The battery cell according to claim 12, characterized in that, The electrode assembly has a wound structure, and the electrode assembly includes a first electrode sheet. Each turn of the first electrode sheet has a first electrode tab, which is used to form a first electrode tab cluster or a second electrode tab cluster.

14. The battery cell according to claim 12, characterized in that, The electrode assembly includes a first central surface, which is perpendicular to the width direction of the first wall; The electrode assembly has a wound structure. The electrode assembly includes a first electrode sheet. Each turn of the first electrode sheet has two first electrode tabs. The two first electrode tabs are located on both sides of the first center surface. The two first electrode tabs are used to form the first electrode tab cluster or the second electrode tab cluster, respectively.

15. The battery cell according to claim 12, characterized in that, The electrode assembly has a stacked structure and includes multiple first electrodes, each of which has a first tab. The first tab is used to form a first tab cluster or a second tab cluster.

16. The battery cell according to any one of claims 1-15, characterized in that, The electrode assembly further includes a main body, from which a plurality of first electrode tabs extend. The first electrode lead-out component includes a first electrode terminal and a first adapter connected to each other. The first electrode terminal is disposed on the first wall, with at least a portion of the first electrode terminal located on the outer side of the first wall. At least a portion of the first adapter is located on the inner side of the first wall. The first adapter is disposed between the first wall and the main body, and two first electrode tab clusters and two second electrode tab clusters are electrically connected to the first adapter, respectively.

17. The battery cell according to claim 16, characterized in that, The thickness of the first adapter is T, which satisfies 0.4mm≤T≤2.5mm.

18. The battery cell according to claim 16 or 17, characterized in that, The first adapter includes a first connection area and a second connection area. The first electrode cluster and the second electrode cluster are connected to the first connection area, and the first electrode terminal is connected to the second connection area. The thickness of the first connection area is less than the thickness of the second connection area.

19. The battery cell according to any one of claims 16-18, characterized in that, Each of the first tab clusters forms a first solder mark with the first adapter, and the two first solder marks are respectively located on both sides of the first center line along the width direction of the first wall; Each of the second electrode clusters forms a second solder mark with the first adapter, and the two second solder marks are respectively located on both sides of the first center line along the width direction of the first wall.

20. The battery cell according to claim 19, characterized in that, The first adapter is provided with a first notch and a second notch. The first notch and the second notch are respectively located at both ends of the first adapter along the length direction of the first wall. Along the width direction of the first wall, the first notch is located between two first solder marks, and the second notch is located between two second solder marks.

21. The battery cell according to any one of claims 1-15, characterized in that, The first electrode lead-out component includes a first electrode terminal, a portion of which is located inside the first electrode lead-out hole, and a portion of which is located inside the first wall and connected to the first electrode tab cluster and the second electrode tab cluster.

22. The battery cell according to any one of claims 1-21, characterized in that, The first electrode lead-out component includes a first connecting part and a second connecting part that are connected to each other. The first connecting part is connected to the first electrode tab cluster, and the second connecting part is connected to the second electrode tab cluster. The electrode assembly also includes a main body portion from which a plurality of first electrode tabs extend; The first wall includes a first region and a second region. The first region includes a first inner surface facing the main body. The second region includes a second inner surface facing the main body. Along the thickness direction of the first wall, the second inner surface is further away from the main body than the first inner surface. At least a portion of the first connecting portion is located between the second inner surface and the first inner surface. The second connecting portion is located on the side of the first inner surface facing the main body.

23. The battery cell according to claim 22, characterized in that, The number of first electrodes constituting the first electrode cluster is greater than the number of first electrodes constituting the second electrode cluster.

24. The battery cell according to claim 23, characterized in that, The thickness of the first connecting part is greater than the thickness of the second connecting part.

25. The battery cell according to any one of claims 1-24, characterized in that, Each of the electrode assemblies includes a body portion having a first end facing the first wall, and a plurality of first tabs extending from the first end.

26. The battery cell according to claim 25, characterized in that, The first wall is provided with a second electrode lead-out hole, which is spaced apart from the first electrode lead-out hole along the length direction of the first wall. The second electrode lead-out hole has a second center line, which is parallel to the thickness direction of the first wall. The battery cell also includes a second electrode lead-out component, a portion of which is disposed within the second electrode lead-out hole, and a portion of which is located on the inner side of the first wall; The electrode assembly further includes a plurality of second tabs, the polarity of which is opposite to that of all the first tabs. The plurality of second tabs extend from the first end. A portion of the second tabs in all the electrode assemblies forms two third tab clusters, and another portion of the second tabs in all the electrode assemblies forms two fourth tab clusters. Along the length direction of the first wall, the two third tab clusters and the two fourth tab clusters are arranged at intervals. The two third tab clusters are located on one side of the second center line, and the two fourth tab clusters are located on the other side of the second center line. The two third tab clusters and the two fourth tab clusters are electrically connected to the second electrode lead-out component, respectively. The two third tab clusters are located on both sides of the second center line along the width direction of the first wall, and the two fourth tab clusters are located on both sides of the second center line along the width direction of the first wall.

27. The battery cell according to any one of claims 1-26, characterized in that, The electrode assembly includes a flat region, and the electrode sheets of the electrode assembly are stacked in the flat region along the width direction of the first wall.

28. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-27.

29. An electrical appliance, characterized in that, The electrical device includes a battery cell as described in any one of claims 1-27, the battery cell being used to provide electrical energy; or, the electrical device includes a battery device as described in claim 28, the battery device being used to provide electrical energy.

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