Battery cell, battery device, and electric device

Abstract

The embodiment of the present application provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, a first electrode lead-out component and at least an electrode assembly; the shell comprises a first wall; a part of the first electrode lead-out component is arranged in a first electrode lead-out hole of the first wall, and the part of the first electrode lead-out component is located on the inner side of the first wall; each electrode assembly comprises a plurality of first tabs with the same polarity; the first tabs in all electrode assemblies form a first tab cluster and a second tab cluster respectively; the first electrode lead-out hole has a first center line; the first tab cluster is located on one side of the first center line, and the second tab cluster is located on the other side of the first center line; and the first tab cluster and the second tab cluster are electrically connected with the first electrode lead-out component respectively. The technical scheme of the present application can improve the energy density of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery cell 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 reliability 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, including a casing, a first electrode lead-out component, and at least one electrode assembly; the casing includes a first wall, the first wall being provided with a first electrode lead-out hole; 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 casing; 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 a first tab cluster, and another portion of the first tabs in all electrode assemblies are stacked to form a second tab cluster, 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, and along the length direction of the first wall, the first tab cluster and the second tab cluster are arranged at intervals, the first tab cluster is located on one side of the first center line, the second tab cluster is located on the other side of the first center line, and the first tab cluster and the second tab cluster are respectively electrically connected to the first electrode lead-out component.

[0007] According to the battery cell of this application embodiment, a portion of the first tabs in all electrode assemblies are stacked to form a first tab cluster, and another portion of the first tabs in all electrode assemblies are stacked to form a second tab cluster. The first tab cluster and the second tab cluster are arranged at intervals along the length direction of the first wall. By setting the first tab cluster and the second tab cluster 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. While meeting the overcurrent requirements, the thickness of the portion of the first electrode lead-out component connected to the first tab cluster and the thickness of the portion connected to the second tab cluster can be designed to be thinner, thereby reducing the space occupied by the portion of the first electrode lead-out component connected to the first tab cluster and the portion connected to the second tab cluster 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, and thus improving the energy density of the battery cell. Furthermore, compared to a wider tab cluster, the connection area between the tab cluster and the first electrode lead-out component is larger, which can easily lead to damage to the first tab. The design of the first and second tab clusters in this application can reduce the impact of the welding connection between the first and first electrode lead-out components on the second tab cluster, and vice versa, thereby improving the reliability of the battery cell. Moreover, when the electrode assembly is a wound structure, with the same total tab width, a wider tab is more prone to tab folding. The design of the first and second tab clusters in this application can reduce the risk of first tab folding, improving the yield and reliability of the battery cell.

[0008] According to some embodiments of this application, a first electrode cluster is welded to a first electrode lead-out component to form a first solder mark, and a second electrode cluster is welded to the first electrode lead-out component to form a second solder mark. Along the length direction of the first wall, the first solder mark is located on one side of the first center line, and the second solder mark is located on the other side of the first center line.

[0009] In the above scheme, the first solder mark and the second solder mark are distributed on both sides of the first center line along the length direction of the first wall, so that the current distributed at the first solder mark and the second solder mark on the first electrode lead-out component can be smaller. 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 smaller, so as to reduce the space occupied by the structure after the first electrode tab cluster is connected to the first electrode lead-out component in the thickness direction of the first wall, and reduce the space occupied by the structure after the second electrode tab cluster is connected to the first electrode lead-out component in the thickness direction of the first wall, which is beneficial to improve 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.

[0010] According to some embodiments of this application, at least one electrode assembly has at least one first tab cluster and at least one second tab cluster.

[0011] In the above scheme, at least one electrode assembly is provided with a first tab cluster and a second tab cluster, so that the current distribution of the electrode assembly is uniform and the space occupied by multiple first tabs in the thickness direction of the first wall can be reduced while meeting the overcurrent requirements. When there are multiple electrode assemblies, different electrode assemblies can be provided with different structural forms, which is flexible and can be adapted to different application scenarios.

[0012] According to some embodiments of this application, one of the electrode assemblies has two first tab clusters, which are respectively located on both sides of the first center line along the width direction of the first wall; and / or, one of the electrode assemblies has two second tab clusters, which are respectively located on both sides of the first center line along the width direction of the first wall.

[0013] In the above scheme, one of the electrode assemblies has two first tab clusters, and the two first tab clusters are located on both sides of the first center line along the width direction of the first wall, so as to facilitate uniform current distribution and improve the overcurrent effect. In addition, there is a certain gap between the two first tab clusters to facilitate heat dissipation. At the same time, the number of first tabs in each tab cluster can be designed to be small. On the one hand, this reduces the space occupied by each tab cluster in the thickness direction of the first wall and increases the energy density of the battery cell. On the other hand, it can reduce the welding power when welding each tab cluster to the first electrode lead-out component and reduce the damage to the first tab during welding.

[0014] One of the electrode assemblies has two second tab clusters, which are located on both sides of the first center line along the width direction of the first wall to facilitate uniform current distribution and improve overcurrent performance. In addition, there is a certain gap between the two second tab clusters to facilitate heat dissipation. At the same time, the number of first tabs in each second tab cluster can be designed to be smaller. On the one hand, this reduces the space occupied by multiple first tabs in the thickness direction of the first wall and increases the energy density of the battery cell. On the other hand, it can reduce the welding power when welding the second tab clusters to the first electrode lead-out component and reduce the damage to the first tabs during welding.

[0015] All electrode assemblies have two first tab clusters and two second tab clusters. 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, so as to facilitate uniform current distribution and improve overcurrent effect. In addition, there is a certain gap between each tab cluster to facilitate heat dissipation. At the same time, the number of first tabs in each tab cluster can be designed to be small. On the one hand, this reduces the space occupied by multiple first tabs in the thickness direction of the first wall and increases the energy density of the battery cell. On the other hand, it can reduce the welding power when welding the tab cluster to the first electrode lead-out component and reduce the damage to the first tabs during welding.

[0016] According to some embodiments of this application, one of the electrode assemblies has two first tab clusters, each first tab cluster being welded to a first electrode lead-out component to form a first solder mark, the two first solder marks being located on both sides of the first center line along the width direction of the first wall; and / or, one of the electrode assemblies has two second tab clusters, each second tab cluster being welded to the first electrode lead-out component to form a second solder mark, the two second solder marks being located on both sides of the first center line along the width direction of the first wall.

[0017] In the above scheme, one of the electrode assemblies has two first tab clusters. Each first tab cluster is welded to the first electrode lead-out component to form a first 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, the thickness of the first electrode lead-out component at the first solder mark can be designed to be thinner. 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, 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.

[0018] One of the electrode assemblies has two second tab clusters. Each second tab cluster is welded to the first electrode lead-out component to form a second solder mark. By 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 second solder mark can be designed to be thinner. This allows the structure after the second tab cluster is connected to the first electrode lead-out component to occupy less space in the thickness direction of the first wall, which helps to improve 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.

[0019] One of the electrode assemblies has two first tab clusters and two second tab clusters. Each first tab cluster is welded to a first electrode lead-out component to form a first solder mark, and each second tab cluster is welded to a 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 is connected to the first electrode lead-out component to occupy less space in the thickness direction of the first wall, and the structure after the second tab cluster is connected to the first electrode lead-out component to occupy less space in the thickness direction of the first wall. This improves 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.

[0020] According to some embodiments of this application, a battery cell includes an electrode assembly.

[0021] In the above scheme, the battery cell includes an electrode assembly. The thickness of the battery cell can be designed to be relatively thin. Since the first tab cluster and the second tab cluster are located on both sides of the first center line along the length direction of the first wall, the thinner battery cell can have a higher current carrying capacity, so that the battery cell has a higher charge and discharge performance.

[0022] According to some embodiments of this application, the dimension of the battery cell along the width direction of the first wall is greater than or equal to 10 mm and less than or equal to 35 mm.

[0023] In the above scheme, the dimension of the battery cell in the width direction of the first wall can be the thickness of the battery cell. Since the first tab cluster and the second tab cluster are located on both sides of the first center line along the length direction of the first wall, the electrode assembly has a high current carrying capacity. The dimension of the battery cell in the width direction of the first wall can be designed to be greater than or equal to 10 mm and less than or equal to 35 mm, so that the battery cell can have a thinner thickness to meet different application scenarios.

[0024] According to some embodiments of this application, all electrode assemblies have a first tab cluster and a second tab cluster.

[0025] In the above scheme, each electrode assembly has a first tab cluster and a second tab cluster, which enables the electrode assembly to have a high current carrying capacity. The number of first tabs in each tab cluster can be designed to be small, so as to reduce the space occupied by each tab cluster 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.

[0026] According to some embodiments of this application, a single battery cell includes multiple electrode assemblies.

[0027] In the above scheme, each of the multiple electrode components has a first tab cluster and a second tab cluster. The current distributed to each tab cluster can be relatively small, which further allows the number of first tabs in each tab cluster to be designed to be relatively small, so as to reduce the space occupied by each tab cluster 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.

[0028] According to some embodiments of this application, the electrode assembly having at least one first tab cluster and at least one second tab cluster is a wound structure. The electrode assembly includes a first electrode sheet, the first tab cluster is formed by a portion of the first tabs of the first electrode sheet, and the second tab cluster is formed by another portion of the first tabs of the first electrode sheet.

[0029] In the above scheme, the electrode assembly having at least one first tab cluster and at least one second tab cluster is a wound structure. In this electrode assembly, the first tab cluster and the second tab cluster are composed of different turns of first tabs. The number of first tabs constituting the first tab cluster and the number of first tabs constituting the second tab cluster can both be designed to be small, which allows the first tab cluster and the second tab cluster to occupy less space in the thickness direction of the first wall, which 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.

[0030] According to some embodiments of this application, an electrode assembly having at least one first tab cluster and at least one second tab cluster is a wound structure. The electrode assembly includes a first electrode sheet, each turn of the first electrode sheet having two first tabs, one of which is used to form a first tab cluster, and the other of which is used to form a second tab cluster.

[0031] In the above scheme, the electrode assembly having at least one first tab cluster and at least one second tab cluster is a wound structure. Each turn of the first electrode sheet has two first tabs, which are used to form the first tab cluster and the second tab cluster, respectively. Compared to each turn of the first electrode sheet having two first tabs and the two first tabs forming one tab cluster, 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 smaller. This is beneficial to reducing the space occupied by the first tab cluster and the second tab cluster in the thickness direction of the first wall, and to increasing the space occupancy rate of the battery cell in the thickness direction of the first wall, thereby increasing the energy density of the battery cell.

[0032] According to some embodiments of this application, an electrode assembly having at least one first tab cluster and at least one second tab cluster includes a first central surface, which is perpendicular to the width direction of a first wall; the first tab cluster and the second tab cluster are respectively located on both sides of the first central surface.

[0033] 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 tab cluster and the second tab cluster are located on opposite sides of the first center plane, which facilitates uniform current distribution, improves the overcurrent effect of the multiple first tabs, and thus improves the charge and discharge performance of the battery cell. For example, in an embodiment where the first tab cluster is composed of a portion of the first tabs of the coiled electrode sheet, and the second tab cluster is composed of another portion of the first tabs of the coiled electrode sheet, the first tab cluster and the second tab cluster are located on opposite sides of the first center plane, which facilitates uniform current distribution through the multiple first tabs and improves the overcurrent effect of the multiple first tabs. As another example, in an embodiment where each coiled first electrode sheet has two first tabs, and the two first tabs are used to form the first tab cluster and the second tab cluster respectively, the first tab cluster and the second tab cluster are located on opposite sides of the first center plane. The multiple first tabs have high overcurrent capacity and uniform current distribution, which facilitates improving the overcurrent effect of the multiple first tabs and gives the battery cell high charge and discharge performance.

[0034] According to some embodiments of this application, the electrode assembly having two first electrode tab clusters and two second electrode tab clusters is a wound structure. The electrode assembly includes a first electrode sheet. Each turn of the first electrode sheet with the first electrode tabs has four first electrode tabs. Two of the four first electrode tabs are used to form a first electrode tab cluster, and the other two of the four first electrode tabs are used to form a second electrode tab cluster.

[0035] In the above scheme, each coil of the first electrode sheet with the first tab has four first tabs. Two of the four first tabs are used to form two first tab clusters, and the other two are used to form two second tab clusters. This allows the multiple first tabs to have a high current-carrying capacity, which facilitates the improvement of the current-carrying effect of the multiple first tabs and gives the battery cell high charge and discharge performance. In addition, compared with wider tabs, four first tabs can reduce the risk of short circuit due to the first tab folding and contact with the electrode sheet of opposite polarity. Furthermore, while meeting the current-carrying requirements, the first tabs can be set only in some coils of the first electrode sheet, so that the number of first tabs in each tab cluster can be designed to be smaller, 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.

[0036] According to some embodiments of this application, an electrode assembly having two first electrode clusters and two second electrode clusters includes a first central surface perpendicular to the width direction of a first wall; the two first electrode clusters are respectively located on both sides of the first central surface; and / or, the two second electrode clusters are respectively located on both sides of the first central surface.

[0037] In the above scheme, compared to setting the tab cluster only on one side of the first center plane, the two first tab clusters are located on both sides of the first center plane, and the two second tab clusters are located on both sides of the first center plane. On the one hand, the total number of the multiple first tabs is larger, which is conducive to improving the current carrying capacity of the multiple first tabs. On the other hand, without increasing the total number of the multiple first tabs while meeting the current carrying requirements, the four tab clusters are distributed to improve the consistency of current distribution and improve the current carrying effect of the multiple first tabs. Moreover, the overall thickness of each tab cluster is smaller, which helps to reduce the space occupied by the multiple first tabs in the thickness direction of the first wall, improve the space utilization rate of the battery cell in the thickness direction of the first wall, and thus improve the energy density of the battery cell.

[0038] According to some embodiments of this application, the electrode assembly having two first electrode clusters and two second electrode clusters is a stacked structure. The electrode assembly includes a plurality of first electrode sheets stacked along the width direction of the first wall. Each first electrode sheet has a first electrode tab. The first electrode tabs of some first electrode sheets constitute a first electrode cluster, and the first electrode tabs of other first electrode sheets constitute a second electrode cluster.

[0039] In the above scheme, the first tabs of some first electrode sheets constitute a first tab cluster, and the first tabs of other first electrode sheets constitute 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.

[0040] According to some embodiments of this application, the electrode assembly is a stacked structure. The electrode assembly having two first electrode clusters and two second electrode clusters includes a plurality of first electrode sheets stacked along the width direction of the first wall. Each first electrode sheet has at least two first electrode ears. At least one of all the first electrode ears is used to form a first electrode cluster, and at least another of all the first electrode ears is used to form a second electrode cluster.

[0041] 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.

[0042] According to some embodiments of this application, there are multiple electrode assemblies, which are stacked along the width direction of the first wall; all first electrode clusters are formed by at least one of all electrode assemblies, and all second electrode clusters are formed by at least another of all electrode assemblies.

[0043] In the above scheme, there are multiple electrode assemblies, which facilitates setting a larger capacity in the battery cell; 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 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, which facilitates improving the charge and discharge performance and service life of the battery cell.

[0044] 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.

[0045] 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.

[0046] 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 located on both sides of the first central surface, and both first electrode tabs are used to form a first electrode tab cluster or a second electrode tab cluster.

[0047] 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.

[0048] 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 first electrode plate having a first electrode tab, which is used to form a first electrode tab cluster or a second electrode tab cluster.

[0049] In the above scheme, while meeting the overcurrent requirements, each first electrode has a first tab, which helps to reduce the internal resistance of the battery cell and improve the charging and discharging performance of the battery cell.

[0050] 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 the first electrode tab cluster and the second electrode tab cluster are electrically connected to the first adapter respectively.

[0051] 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.

[0052] According to some embodiments of this application, the thickness of the first adapter is T, which satisfies 0.4mm≤T≤2.5mm.

[0053] 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.

[0054] 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.

[0055] In the above scheme, compared to multiple first tabs forming a tab cluster, multiple first tabs forming a first tab cluster and a second tab cluster, while meeting the overall overcurrent requirements, the current flowing through the first tab cluster and the current flowing through the second tab cluster can both be designed to be smaller. This allows the thickness of the first connection area connected to the first tab cluster and the second tab cluster to be smaller, so as to reduce the space occupied by the first connection area in the thickness direction of the first wall, improve the space utilization rate of the battery cell in the thickness direction of the first wall, and improve the energy density of the battery cell.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] According to some embodiments of this application, the thickness of the first connecting portion is greater than the thickness of the second connecting portion.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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. A portion of the second tabs in all electrode assemblies form a third tab cluster, and another portion of the second tabs in all electrode assemblies form a fourth tab cluster. The third tab cluster and the fourth tab cluster are arranged spaced apart along the length direction of the first wall. The third tab cluster is located on one side of the second center line, and the fourth tab cluster is located on the other side of the second center line. The third tab cluster and the fourth tab cluster are electrically connected to the second electrode lead-out component, respectively.

[0067] 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; multiple second tabs form a third tab cluster and a fourth tab cluster. By setting the third tab cluster and the fourth tab cluster on both sides of the second center line of the second electrode lead hole along the length direction of the first wall, the current flowing through the second electrode lead component is distributed on both sides of the second center line. While meeting the overcurrent requirements, the thickness of the part of the second electrode lead component located on the inner side of the first wall can be designed to be thinner, thereby reducing the space occupied by this part 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 thus improving the energy density of the battery cell.

[0068] 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.

[0069] In the above scheme, the thickness direction of the battery cell is parallel to the width direction of the first wall.

[0070] Secondly, embodiments of this application also provide a battery device, which includes a battery cell provided according to any of the above embodiments.

[0071] 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.

[0072] 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

[0073] 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.

[0074] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0075] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0076] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0077] 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;

[0078] Figure 5 This is a schematic diagram of the structure of a wound electrode assembly provided in some embodiments of this application;

[0079] Figure 6 This is a schematic diagram of the structure of a stacked electrode assembly provided in some embodiments of this application;

[0080] Figure 7 This is a schematic diagram of the structure of a wound electrode assembly provided in other embodiments of this application;

[0081] Figure 8 This is a schematic diagram of the structure of a stacked electrode assembly provided in other embodiments of this application;

[0082] Figure 9 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;

[0083] Figure 10 This is a schematic diagram of the structure of a wound electrode assembly provided in some embodiments of this application;

[0084] Figure 11 This is a schematic diagram of the structure of a stacked electrode assembly provided in some embodiments of this application;

[0085] Figure 12 Schematic diagram of the structure of a wound electrode assembly provided in some embodiments of this application;

[0086] Figure 13 A schematic diagram of the structure of a wound electrode assembly provided in some further embodiments of this application;

[0087] Figure 14 This is a schematic diagram of the structure of a stacked electrode assembly provided in some further embodiments of this application;

[0088] Figure 15 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0089] Figure 16 for Figure 15 A magnified view of part A;

[0090] Figure 17A 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;

[0091] Figure 18 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;

[0092] Figure 19 for Figure 15 A magnified view of section B.

[0093] 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 Rotation Components; 22f-First connection 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-Insulator; 26-Sealer; 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; X-Width direction of the first wall; Y-Length direction of the first wall; Z-Thickness direction of the first wall. Detailed Implementation

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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).

[0101] 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.

[0102] 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.

[0103] 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.

[0104] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0105] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.).

[0116] 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.

[0117] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0125] In some implementations, the electrode assembly is a stacked structure.

[0126] 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.

[0127] 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.

[0128] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] The development of battery device technology must take into account multiple design factors, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. In addition, the reliability of the battery device also needs to be considered.

[0133] The electrode assembly includes multiple positive electrode tabs and multiple negative electrode tabs. Multiple positive electrode tabs are stacked to form a positive electrode tab cluster, and multiple negative electrode tabs are stacked to form a negative electrode tab cluster.

[0134] In some embodiments, a battery cell includes a housing, at least one electrode assembly, and an electrode lead-out component. At least one electrode assembly is disposed within the housing, and the electrode lead-out component is disposed on a first wall of the housing. The first wall has electrode lead-out holes through which the electrode lead-out component passes. 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 component is 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 hole, allowing a larger current to flow through the portion of the electrode lead-out component located on that side. Because the electrode lead-out component needs to meet the requirement of carrying a large current, its thickness is typically designed to be relatively thick. The electrode lead-out component occupies 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 of the battery cell.

[0135] 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 casing, a first electrode lead-out component, and at least one electrode assembly. The casing includes a first wall, and the first wall is provided with a first electrode lead-out hole; the first electrode lead-out component is disposed on the first wall, a part of the first electrode lead-out component is disposed in the first electrode lead-out hole, and a part of the first electrode lead-out component is located on the inner side of the first wall; at least one electrode assembly is disposed in the casing; 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 a first tab cluster, and another portion of the first tabs in all electrode assemblies are stacked to form a second tab cluster. The first electrode lead-out hole has a first center line, which is parallel to the thickness direction of the first wall. Along the length direction of the first wall, the first tab cluster and the second tab cluster are arranged at intervals, the first tab cluster is located on one side of the first center line, and the second tab cluster is located on the other side of the first center line. The first tab cluster and the second tab cluster are electrically connected to the first electrode lead-out component, respectively.

[0136] In such a battery cell, a portion of the first tabs in all electrode assemblies are stacked to form a first tab cluster, and another portion of the first tabs in all electrode assemblies are stacked to form a second tab cluster. The first tab cluster and the second tab cluster are arranged at intervals along the length of the first wall. By placing the first tab cluster and the second tab cluster 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. While meeting the overcurrent requirements, the thickness of the portion of the first electrode lead-out component connecting the first tab cluster and the portion connecting the second tab cluster can be designed to be thinner, thereby reducing the space occupied by the portion of the first electrode lead-out component connecting the first tab cluster and the portion connecting the second tab cluster 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, and thus improving the energy density of the battery cell. Furthermore, compared to simply having a single, wider tab cluster, which has a larger connection area with the first electrode lead-out component and is more prone to damage, the design of the first and second tab clusters in this application reduces the impact of the welding connection between the first and second tab clusters on the second tab cluster, and vice versa, thereby improving the reliability of the battery cell. Moreover, when the electrode assembly has a wound structure, with the same total tab width, a single, wider tab is more prone to tab folding. The design of the first and second tab clusters in this application reduces the risk of first tab folding, improving the yield and reliability of the battery cell.

[0137] 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.

[0138] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices.

[0139] 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.

[0140] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] Please refer to Figures 3 to 6 , Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application. Figure 4 This 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 of the structure of a wound electrode assembly provided in some embodiments of this application. Figure 6This is a schematic diagram of the structure of a stacked electrode assembly provided in some embodiments of this application. This application provides a battery cell 20, which includes a housing 21, a first electrode lead-out component 22, and at least one electrode assembly 23. The housing 21 includes a first wall 211, which has 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 a first tab cluster 231a, and another portion of the first tabs 23c in all electrode assemblies 23 are stacked to form a second tab cluster 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 first tab clusters 231a and the 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 first tab cluster 231a is located on one side of the first center line C1, and the second tab cluster 231b is located on the other side of the first center line C1. The first tab clusters 231a and the second tab clusters 231b are electrically connected to the first electrode lead-out component 22, respectively.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] The first wall 211 can be a wall portion of the housing 21a or an end cap 21b.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] The first tab cluster 231a and the second tab cluster 231b are electrically connected to the third part 22c, respectively.

[0158] Each electrode assembly 23 includes a flat region 23a, in which the electrode sheets of the electrode assembly 23 are stacked along the width direction of the first wall in the flat region 23a. The flat region 23a of the electrode assembly 23 may correspond to the large surface of the outer casing 21. The flat region 23a can 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 can be arranged substantially flat, that is, extending along the plane.

[0159] When the electrode assembly 23 has a stacked structure, the positive and negative electrode sheets are stacked in the flat region 23a 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 23a and two bending regions. The two ends of the flat region 23a 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 23a along the width direction X of the first wall.

[0160] The electrode assembly 23 includes a first electrode 231, which 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 portion 23b.

[0161] 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.

[0162] 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.

[0163] In all electrode assemblies 23, a portion of the first tabs 23c are stacked to form a first tab cluster 231a. The multiple first tabs 23c of the first tab cluster 231a are electrically connected to form a whole.

[0164] In all electrode assemblies 23, another part of the first electrode tabs 23c are stacked to form a second electrode tab cluster 231b. The multiple first electrode tabs 23cs in the second electrode tab cluster 231b are electrically connected to form a whole.

[0165] A tab cluster refers to a structure formed by stacking multiple tabs.

[0166] The first anode cluster 231a and the second anode cluster 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 first anode cluster 231a and the second anode cluster 231b do not overlap. Furthermore, along the length direction Y of the first wall, the orthographic projections of the first anode cluster 231a and the second anode cluster 231b are located on both sides of the orthographic projection of the first center line C1.

[0167] In some embodiments, the first tab cluster 231a and the second tab cluster 231b can be welded to the first electrode lead-out component 22, for example, the first tab cluster 231a and the second tab cluster 231b can be ultrasonically welded to the first electrode lead-out component 22, or the first tab cluster 231a and the second tab cluster 231b can be laser welded to the first electrode lead-out component 22, so that the first tab cluster 231a and the second tab cluster 231b are reliably connected to the first electrode lead-out component 22, and current can flow between the first tab cluster 231a and the second tab cluster 231b and the first electrode lead-out component 22.

[0168] 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.

[0169] According to the battery cell 20 of this application embodiment, a portion of the first tabs 23c of all electrode assemblies 23 are stacked to form a first tab cluster 231a, and another portion of the first tabs 23c of all electrode assemblies 23 are stacked to form a second tab cluster 231b. The first tab clusters 231a and the second tab clusters 231b are arranged at intervals along the length direction Y of the first wall. By placing the first tab clusters 231a and the 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 flow through the first electrode lead-out portion is... The current of component 22 is distributed on both sides of the first center line C1. While meeting the overcurrent requirements, the thickness of the part of the first electrode lead-out component 22 that connects to the first tab cluster 231a and the part that connects to the second tab cluster 231b can be designed to be thinner. This reduces the space occupied by the part of the first electrode lead-out component 22 that connects to the first tab cluster 231a and the second tab cluster 231b in the thickness direction Z of the first wall, improves the space utilization rate inside the battery cell 20 in the thickness direction Z of the first wall, and thus improves the energy density of the battery cell 20. Furthermore, compared to a wider tab cluster, the connection area between the tab cluster and the first electrode lead-out component 22 is larger, which can easily lead to damage to the first tab 23c. The design of the first tab cluster 231a and the second tab cluster 231b of this application can reduce the impact of the welding connection between the first tab cluster 231a and the first electrode lead-out component 22 on the second tab cluster 231b, and reduce the impact of the welding connection between the second tab cluster 231b and the first electrode lead-out component 22 on the first tab cluster 231a, thereby improving the reliability of the battery cell 20. Moreover, when the electrode assembly 23 is a wound structure, with the same total tab width, the tab is more prone to folding compared to a wider tab. The design of the first tab cluster 231a and the second tab cluster 231b of this application can reduce the risk of the first tab 23c folding, and improve the yield and reliability of the battery cell 20.

[0170] Please refer to Figure 4 According to some embodiments of this application, the first electrode cluster 231a is welded to the first electrode lead-out component 22 to form a first solder mark H1, and the second electrode cluster 231b is welded to the first electrode lead-out component 22 to form a second solder mark H2. Along the length direction Y of the first wall, the first solder mark H1 is located on one side of the first center line C1, and the second solder mark H2 is located on the other side of the first center line C1.

[0171] In the above scheme, the first solder mark H1 and the second solder mark H2 are distributed on both sides of the first center line C1 along the length direction Y of the first wall, so that the current distributed at the first solder mark H1 and the second solder mark H2 on the first electrode lead-out component 22 can be smaller. 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 smaller, so as to reduce the space occupied by the structure after the first tab cluster 231a is connected to the first electrode lead-out component 22 in the thickness direction Z of the first wall, and reduce the space occupied by the structure after the second tab cluster 231b is connected to the first electrode lead-out component 22 in the thickness direction Z of the first wall. This is beneficial to improve 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.

[0172] According to some embodiments of this application, please refer to Figure 5 and Figure 6 At least one electrode assembly 23 has at least one first tab cluster 231a and at least one second tab cluster 231b.

[0173] For example, the electrode assembly 23 may have one first tab cluster 231a and one second tab cluster 231b; or, the electrode assembly may have one first tab cluster 231a and two second tab clusters 231b, with the two second tab clusters 231b spaced apart along the width direction X of the first wall; or, the electrode assembly 23 may have two first tab clusters 231a and one second tab cluster 231b, with the two first tab clusters 231a spaced apart along the width direction X of the first wall; or, the electrode assembly 23 may have two first tab clusters 231a and two second tab clusters 231b, with the two first tab clusters 231a spaced apart along the width direction X of the first wall, and the two second tab clusters 231b spaced apart along the width direction X of the first wall.

[0174] When there are multiple electrode components 23, at least one electrode component 23 has at least one first tab cluster 231a and at least one second tab cluster 231b; other electrode components 23 may have only one tab cluster, for example, some electrode components 23 have only the first tab cluster 231a and some electrode components 23 have only the second tab cluster 231b. In this application, a tab cluster refers to a whole composed of multiple tabs of the same polarity stacked together, for example, it can be a collective term for the first tab cluster 231a and the second tab cluster 231b.

[0175] In the above scheme, at least one electrode assembly 23 is provided with a first tab cluster 231a and a second tab cluster 231b, so that the current distribution of the electrode assembly 23 is uniform and the space occupied by multiple first tabs 23c in the thickness direction Z of the first wall can be reduced while meeting the overcurrent requirements. When there are multiple electrode assemblies 23, different electrode assemblies 23 can be provided with different structural forms, which is flexible and can be adapted to different application scenarios.

[0176] Please refer to Figure 7 and Figure 8 , Figure 7 This is a schematic diagram of the structure of a wound electrode assembly provided in other embodiments of this application. Figure 8 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, one of the electrode assemblies 23 has two first tab clusters 231a, which are respectively located on both sides of the first center line C1 along the width direction X of the first wall; and / or, one of the electrode assemblies 23 has two second tab clusters 231b, which are respectively located on both sides of the first center line C1 along the width direction X of the first wall.

[0177] The electrode assembly 23 has two first tab clusters 231a and at least one second tab cluster 231b. The electrode assembly 23 has a large number of first tabs 23c and has a high current-carrying capacity.

[0178] Alternatively, the electrode assembly 23 may have at least one first tab cluster 231a and two second tab clusters 231b, and the electrode assembly 23 may have a larger number of first tabs 23c, thus having a higher current-carrying capacity.

[0179] Alternatively, the electrode assembly 23 may have two first tab clusters 231a and two second tab clusters 231b, and the electrode assembly 23 may have a large number of first tabs 23c, thus having a high current carrying capacity.

[0180] For example, when the electrode assembly 23 is a wound structure, each turn of the first electrode sheet 231 with the first tab 23c can be provided with four first tabs 23c. These four first tabs 23c are used to form two first tab clusters 231a and two second tab clusters 231b, respectively, so that the electrode assembly 23 has a high current carrying capacity. Alternatively, when the electrode assembly 23 is a wound structure, the first tabs 23c forming the first tab cluster 231a and the first tabs 23c forming the second tab cluster 231b are respectively provided on the first electrode sheet 231 in different turns. This can not only make the two first tab clusters 231a and the two second tab clusters 231b have a high current carrying capacity, but also reduce the number of first tabs 23c in each tab cluster. While meeting the current carrying requirements, the thickness of each tab cluster can be reduced, and the space occupied by each tab cluster in the thickness direction Z of the first wall can be reduced.

[0181] For example, when the electrode assembly 23 has a stacked structure, the electrode assembly 23 has a plurality of first electrode plates 231, each first electrode plate 231 has two first electrode tabs 23c, the two first electrode tabs 23c are used to form a first electrode tab cluster 231a and a second electrode tab cluster 231b respectively, and the plurality of first electrode tabs 23c form two first electrode tab clusters 231a and two second electrode tab clusters 231b.

[0182] In the above scheme, one of the electrode assemblies 23 has two first tab clusters 231a, which are located on both sides of the first center line C1 along the width direction X of the first wall, so as to facilitate uniform current distribution and improve the overcurrent effect. Furthermore, there is a certain gap between the two first tab clusters 231a to facilitate heat dissipation. At the same time, the number of first tabs 23c in each tab cluster can be designed to be small. On the one hand, this reduces the space occupied by each tab cluster in the thickness direction Z of the first wall and increases the energy density of the battery cell 20. On the other hand, it can reduce the welding power when each tab cluster is welded to the first electrode lead-out component 22, and reduce the damage to the first tab 23c caused by welding.

[0183] One of the electrode assemblies 23 has two second tab clusters 231b, which are located on both sides of the first center line C1 along the width direction X of the first wall, so as to facilitate uniform current distribution and improve the overcurrent effect. Furthermore, there is a certain gap between the two second tab clusters 231b to facilitate heat dissipation. At the same time, the number of first tabs 23c in each tab cluster can be designed to be smaller. On the one hand, this reduces the space occupied by each tab cluster in the thickness direction Z of the first wall and increases the energy density of the battery cell 20. On the other hand, it can reduce the welding power when each tab cluster is welded to the first electrode lead-out component 22, and reduce the damage to the first tab 23c caused by welding.

[0184] One of the electrode assemblies 23 has two first tab clusters 231a and two second tab clusters 231b. The two first tab 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 tab clusters 231b are located on both sides of the first center line C1 along the width direction X of the first wall, so as to facilitate uniform current distribution and improve overcurrent effect. Furthermore, there is a certain gap between each tab cluster, which facilitates heat dissipation. At the same time, the number of first tabs 23c in each tab cluster can be designed to be smaller. On the one hand, this reduces the space occupied by each tab cluster in the thickness direction Z of the first wall, thereby increasing the energy density of the battery cell 20. On the other hand, it can reduce the welding power when each tab cluster is welded to the first electrode lead-out component 22, thereby reducing the damage to the first tabs 23c during welding.

[0185] Please refer to Figure 9 , Figure 9 This is a schematic diagram of the assembly of the first electrode lug and the second electrode lug with the first electrode lead-out component, provided in some embodiments of this application. For ease of description, Figure 9 In the diagram, the first and second electrode tab clusters are in an unfolded state, and only the first and second electrode tab clusters are shown, omitting other parts of the electrode assembly. According to some embodiments of this application, one of the electrode assemblies 23 has two first electrode tab clusters 231a, each first electrode tab 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; and / or, one of the electrode assemblies 23 has two second electrode tab clusters 231b, each second electrode tab 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.

[0186] In the above scheme, one of the electrode assemblies 23 has two first tab clusters 231a. Each first tab cluster 231a is welded to the first electrode lead-out component 22 to form a first solder mark H1. 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, the thickness of the first electrode lead-out component 22 at the first solder mark H1 can be designed to be thinner. This allows the structure after the first tab cluster 231a and the first electrode lead-out component 22 are connected to occupy less space in the thickness direction Z of the first wall, which 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.

[0187] One of the electrode assemblies 23 has two second tab clusters 231b. 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 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 second solder mark H2 can be designed to be thinner. This allows the structure after the second tab cluster 231b is connected to the first electrode lead-out component 22 to occupy less space in the thickness direction Z of the first wall, which 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.

[0188] One of the electrode assemblies 23 has two first tab clusters 231a and two second tab clusters 231b. 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 following is achieved: 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 both be designed to be relatively thin, so that the structure after the first tab cluster 231a is connected to the first electrode lead-out component 22 occupies less space in the thickness direction Z of the first wall, and the structure after the second tab cluster 231b is connected to the first electrode lead-out component 22 occupies less 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.

[0189] According to some embodiments of this application, the battery cell 20 includes an electrode assembly 23.

[0190] The thickness direction of the battery cell 20 can be parallel to the width direction X of the first wall.

[0191] In the above scheme, the battery cell 20 includes an electrode assembly 23. The thickness of the battery cell 20 can be designed to be relatively thin. Since the first tab cluster 231a and the second tab cluster 231b are located on both sides of the first center line C1 along the length direction Y of the first wall, the thinner battery cell 20 can have a higher current carrying capacity, so that the battery cell 20 has a higher charge and discharge performance.

[0192] According to some embodiments of this application, the dimension of the battery cell 20 along the width direction X of the first wall is greater than or equal to 10 mm and less than or equal to 35 mm.

[0193] For example, the dimension of the battery cell 20 in the width direction X of the first wall can be, but is not limited to, any one or any two of 35mm, 32mm, 28mm, 25mm, 20mm, 18mm, 15mm, 13mm, 12mm, and 10mm.

[0194] The dimension of the battery cell 20 in the width direction X of the first wall can be measured using a micrometer or a laser rangefinder. When measuring the dimension of the battery cell 20 in the width direction X of the first wall, the part of the battery cell 20 closest to the first wall 211 can be measured using a micrometer. During measurement, care should be taken to ensure that the battery cell 20 is not deformed. The dimension of the undeformed area of ​​the battery cell 20 in the width direction X of the first wall can be measured. Multiple measurements can be taken and the average value can be taken. This average value is the dimension of the battery cell 20 in the width direction X of the first wall.

[0195] The size of the battery cell 20 in the width direction X of the first wall is designed to be greater than or equal to 10 mm, and the battery cell 20 has a high energy density and is easy to process and manufacture. The size of the battery cell 20 in the width direction X of the first wall is designed to be less than or equal to 35 mm, and the battery cell 20 can have a thinner thickness. The first tab cluster 231a and the second tab cluster 231b are respectively connected to the first electrode lead-out component 22. The thinner battery cell 20 can have a higher overcurrent capacity and a higher charge and discharge performance.

[0196] In the above scheme, the dimension of the battery cell 20 in the width direction X of the first wall can be the thickness of the battery cell 20. Since the first tab cluster 231a and the second tab cluster 231b are located on both sides of the first center line C1 along the length direction Y of the first wall, the electrode assembly 23 has a high current carrying capacity. The dimension of the battery cell 20 in the width direction X of the first wall can be designed to be greater than or equal to 10mm and less than or equal to 35mm, so that the battery cell 20 can have a thinner thickness to meet different application scenarios.

[0197] Please refer to Figure 5 and Figure 6 According to some embodiments of this application, all electrode assemblies 23 have a first tab cluster 231a and a second tab cluster 231b.

[0198] In the above scheme, each electrode assembly 23 has a first tab cluster 231a and a second tab cluster 231b, which makes the electrode assembly 23 have a high current carrying capacity. The number of first tabs 23c in each tab cluster can be designed to be small, so as to reduce the space occupied by each tab cluster in the thickness direction Z of the first wall, which is beneficial to improve 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.

[0199] Please refer to Figure 3 According to some embodiments of this application, the battery cell 20 includes a plurality of electrode assemblies 23.

[0200] In the above scheme, each of the multiple electrode components 23 has a first tab cluster 231a and a second tab cluster 231b. The current distributed to each tab cluster can be relatively small, which further allows the number of first tabs 23c in each tab cluster to be designed to be relatively small, so as to reduce the space occupied by each tab cluster in the thickness direction Z of the first wall, which is beneficial to improve 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.

[0201] According to some embodiments of this application, the electrode assembly 23 having at least one first tab cluster 231a and at least one second tab cluster 231b is a wound structure. The electrode assembly 23 includes a first electrode sheet 231. The first tab cluster 231a is formed by a portion of the first tab 23c that is wound around the first electrode sheet 231, and the second tab cluster 231b is formed by another portion of the first tab 23c that is wound around the first electrode sheet 231.

[0202] The electrode assembly 23 has a wound structure. The electrode assembly 23 includes a first electrode plate 231. A portion of the first electrode plates 231 with first tabs 23c are wound around the first electrode plate 231 to form a first tab cluster 231a. Another portion of the first electrode plates 23c are wound around the first electrode plate 231 to form a second tab 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 electrode plates 23c partially wound around the first electrode plate 231 overlap and are used to form the first tab cluster 231a; the orthographic projections of the first electrode plates 23c partially wound around the first electrode plate 231 overlap and are used to form the second tab cluster 231b.

[0203] In the above scheme, the electrode assembly 23 having at least one first tab cluster 231a and at least one second tab cluster 231b is a wound structure. In the electrode assembly 23, the first tab cluster 231a and the second tab cluster 231b are composed of first tabs 23c with different turns. 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 a small 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.

[0204] Please refer to Figure 5 As shown, according to some embodiments of this application, the electrode assembly 23 having at least one first tab cluster 231a and at least one second tab cluster 231b has a wound structure. The electrode assembly 23 includes a first electrode sheet 231, and each turn of the first electrode sheet 231 has two first tabs 23c. One of the two first tabs 23c is used to form the first tab cluster 231a, and the other of the two first tabs 23c is used to form the second tab cluster 231b.

[0205] 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 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.

[0206] In the above scheme, each ring of first electrode sheet 231 having at least one first tab cluster 231a and at least one second tab cluster 231b 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. Compared with each ring of first electrode sheet 231 having two first tabs 23c and the two first tabs 23c forming a tab cluster, in this embodiment, 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 smaller. This is beneficial to reduce the space occupation of the first tab cluster 231a and the second tab cluster 231b in the thickness direction Z of the first wall, and to increase the space occupancy rate of the battery cell 20 in the thickness direction Z of the first wall, thereby increasing the energy density of the battery cell 20. In addition, compared to the first electrode plate 231 having only one first tab 23c per turn, in this embodiment, the first electrode plate 231 has two first tabs 23c per turn, which can increase the overcurrent capacity of multiple first tabs 23c and improve the charging and discharging performance of the battery cell 20.

[0207] Please refer to Figure 10 , Figure 10 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, an electrode assembly 23 having at least one first tab cluster 231a and at least one second tab cluster 231b includes a first central surface F1, which is perpendicular to the width direction X of the first wall; the first tab cluster 231a and the second tab cluster 231b are respectively located on both sides of the first central surface F1.

[0208] 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.

[0209] 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.

[0210] 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 cluster 231a and 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 the multiple first tabs 23c, and thus improve the charge and discharge performance of the battery cell 20. For example, in an embodiment where the first tab cluster 231a is composed of a portion of the first tabs 23c of coiled electrode sheets, and the second tab cluster 231b is composed of another portion of the first tabs 23c of coiled electrode sheets, the first tab cluster 231a and the second tab cluster 231b are respectively located on both sides of the first center plane F1, which facilitates uniform current distribution through the multiple first tabs 23c and improves the overcurrent effect of the multiple first tabs 23c. For example, in an embodiment where each first electrode 231 has two first tabs 23c, and the two first tabs 23c are respectively used to form a first tab cluster 231a and a second tab cluster 231b, the first tab cluster 231a and the second tab cluster 231b are respectively located on both sides of the first center plane F1. The multiple first tabs 23c have high current carrying capacity and uniform current distribution, which facilitates improving the current carrying effect of the multiple first tabs 23c, so that the battery cell 20 has high charge and discharge performance.

[0211] Please refer to Figure 7 According to some embodiments of this application, the electrode assembly 23 having two first tab clusters 231a and two second tab clusters 231b is a wound structure. The electrode assembly 23 includes a first electrode sheet 231. Each turn of the first electrode sheet 231 with the first tabs 23c has four first tabs 23c. Two of the four first tabs 23c are used to form the first tab cluster 231a, and the other two of the four first tabs 23c are used to form the second tab cluster 231b.

[0212] In each ring of first electrode plates 231 with first electrode tabs 23c, each ring of first electrode plates 231 has four first electrode tabs 23c. On the ring of first electrode plates 231, two first electrode tabs 23c are located in one straight section, and the other two first electrode tabs 23c are located in another straight section. The two first electrode tabs 23c on each straight section are spaced apart along the length direction Y of the first wall, and the two first electrode tabs 23c are respectively used to form the first electrode tab cluster 231a and the second electrode tab cluster 231b.

[0213] In the above scheme, each turn of the first electrode plate 231 with the first tab 23c has four first tabs 23c. Two of the four first tabs 23c are used to form two first tab clusters 231a, and the other two of the four first tabs 23c are used to form two second tab clusters 231b. This makes the multiple first tabs 23c have a high current carrying capacity, which is conducive to improving the current carrying effect of the multiple first tabs 23c, and makes the battery cell 20 have high charge and discharge performance. In addition, compared with wider tabs, four first tabs 23c can reduce the risk of short circuit due to the first tab 23c folding over and overlapping with the electrode with opposite polarity; furthermore, while meeting the overcurrent requirements, the first tabs 23c can be provided only in some of the first electrode sheets 231, so that the number of first tabs 23c in each tab cluster can be designed to be smaller, 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.

[0214] Please refer to Figure 7 According to some embodiments of this application, an electrode assembly 23 having two first electrode clusters 231a and two second electrode clusters 231b includes a first central surface F1, which is perpendicular to the width direction X of the first wall; the two first electrode clusters 231a are respectively located on both sides of the first central surface F1; and / or, the two second electrode clusters 231b are respectively located on both sides of the first central surface F1.

[0215] Two first electrode clusters 231a are spaced apart along the width direction X of the first wall. Along the width direction X of the first wall, one first electrode cluster 231a is located on one side of the first central surface F1, and the other first electrode cluster 231a is located on the other side of the first central surface F1.

[0216] Two second pole ear clusters 231b are spaced apart along the width direction X of the first wall. Along the width direction X of the first wall, one second pole ear cluster 231b is located on one side of the first central surface F1, and the other second pole ear cluster 231b is located on the other side of the first central surface F1.

[0217] In the above scheme, compared to setting the tab cluster only on one side of the first center plane F1, the two first tab clusters 231a are respectively located on both sides of the first center plane F1, and / or the two second tab clusters 231b are respectively located on both sides of the first center plane F1. On the one hand, the total number of the multiple first tabs 23c is larger, which is conducive to improving the current carrying capacity of the multiple first tabs 23c. On the other hand, without increasing the total number of the multiple first tabs 23c, the first tabs 23c can be set only in some of the first electrode plates 231 while meeting the current carrying requirements. Since the four tab clusters are distributed, the consistency of current distribution can be improved, the current carrying effect of the multiple first tabs 23c can be improved, and the overall thickness of each tab cluster is smaller, which is conducive to reducing the space occupation of the multiple first tabs 23c in the thickness direction Z of the first wall, 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.

[0218] Please refer to Figure 6 According to some embodiments of this application, the electrode assembly 23 having at least one first tab cluster 231a and at least one second tab cluster 231b is a stacked structure. The electrode assembly 23 includes a plurality of first electrode sheets 231 stacked along the width direction X of the first wall. Each first electrode sheet 231 has a first tab 23c. The first tabs 23c of some first electrode sheets 231 constitute the first tab cluster 231a, and the first tabs 23c of other first electrode sheets 231 constitute the second tab cluster 231b.

[0219] 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.

[0220] In the above scheme, the first tabs 23c of some of the first electrode sheets 231 constitute the first tab cluster 231a, and the first tabs 23c of other parts of the first electrode sheets 231 constitute the 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.

[0221] Please refer to Figure 11 , Figure 11This 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 having at least one first tab cluster 231a and at least one second tab cluster 231b is a stacked structure. The electrode assembly 23 includes a plurality of first electrode pieces 231 stacked along the width direction X of the first wall. Each first electrode piece 231 has at least two first tabs 23c. At least one of all the first tabs 23c is used to form a first tab cluster 231a, and at least another of all the first tabs 23c is used to form a second tab cluster 231b.

[0222] 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.

[0223] 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.

[0224] Please refer to Figure 12 , Figure 12 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, there are multiple electrode assemblies 23, which are stacked along the width direction X of the first wall; all first tab clusters 231a are formed by at least one of all electrode assemblies 23, and all second tab clusters 231b are formed by at least another of all electrode assemblies 23.

[0225] In some embodiments, all the first tabs 23c of a portion of the electrode assemblies 23 constitute a first tab cluster 231a. The number of first tab clusters 231a can be one or more. When the number of first tab clusters 231a is multiple, the multiple first tab clusters 231a are spaced apart along the width direction X of the first wall. All the first tabs 23c of another portion of the electrode assemblies 23 constitute a second tab cluster 231b. The number of second tab clusters 231b can be one or more. When the number of second tab clusters 231b is multiple, the multiple second tab clusters 231b are spaced apart along the width direction X of the first wall.

[0226] In the above scheme, there are multiple electrode assemblies 23, which facilitates setting a larger amount of power in the battery cell 20; all first tab clusters 231a are formed by at least one of all electrode assemblies 23, and all second tab clusters 231b are formed by at least another of all electrode assemblies 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.

[0227] Please refer to Figure 12 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.

[0228] 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.

[0229] 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.

[0230] Please refer to Figure 13 , Figure 13This 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 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 both sides of the first center surface F1. Both first electrode tabs 23c are used to form a first electrode tab cluster 231a or a second electrode tab cluster 231b.

[0231] 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.

[0232] 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.

[0233] Please refer to Figure 14 , Figure 14 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 a first electrode tab 23c, which is used to form a first electrode tab cluster 231a or a second electrode tab cluster 231b.

[0234] 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.

[0235] 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.

[0236] Please refer to Figure 15 and Figure 16 , Figure 15 This is a cross-sectional view of a battery cell provided in some embodiments of this application. Figure 16 for Figure 15 A 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. The first electrode tab cluster 231a and the second electrode tab cluster 231b are electrically connected to the first adapter 22e, respectively.

[0237] 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.

[0238] 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.

[0239] 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.

[0240] 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.

[0241] 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.

[0242] Please refer to Figure 16 According to some embodiments of this application, the thickness of the first adapter 22e is T, which satisfies 0.4mm≤T≤2.5mm.

[0243] The thickness of the first adapter 22e can be measured with a micrometer.

[0244] 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.

[0245] 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.

[0246] 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.

[0247] 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.

[0248] Optionally, 0.6mm≤T≤1.2mm.

[0249] Please refer to Figure 16 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.

[0250] 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.

[0251] Since the first tab cluster 231a and the second tab cluster 231b are located on both sides of the first centerline C1, the current flowing through the first tab cluster 231a and the current flowing through the second tab cluster 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 current carrying capacity requirement, the thickness of the first connection region 22f can be designed to be smaller to reduce the space occupied by the first connection region 22f in the thickness direction Z of the first wall. At the same time, since the first electrode terminal 22d and the second connection region 22g are connected through the first electrode lead-out hole 211a, the thickness of the second connection region 22g can be designed to be larger to meet the current carrying capacity requirement. Furthermore, by utilizing the space of the first electrode lead-out hole 211a in the thickness direction Z of the first wall, the space occupied by the battery cell 20 in the thickness direction Z of the first wall can be reduced.

[0252] In the above scheme, compared to multiple first tabs 23c forming a tab cluster, multiple first tabs 23c forming a first tab cluster 231a and a second tab cluster 231b, while meeting the overall overcurrent requirements, the current flowing through the first tab cluster 231a and the current flowing through the second tab cluster 231b can be designed to be smaller. This allows the thickness of the first connection area 22f connected to the first tab cluster 231a and the 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.

[0253] Please refer to Figure 17 , Figure 17 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.

[0254] 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.

[0255] In the above scheme, the first electrode terminal 22d passes through the hole of the first electrode lead-out 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 structure of the battery cell 20 simpler 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 of 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.

[0256] Please refer to Figure 18 , Figure 18This 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 some 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.

[0257] 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.

[0258] 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.

[0259] 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.

[0260] The first wall 211 also includes a first transition surface 211f, which connects the first inner surface 211d and the second inner surface 211e.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] 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.

[0265] 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.

[0266] 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.

[0267] 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.

[0268] 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.

[0269] 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.

[0270] 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.

[0271] 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.

[0272] 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.

[0273] 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.

[0274] 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.

[0275] Please refer to Figure 5 and Figure 15 and further refer to Figure 19 , Figure 19 for Figure 15 A partial enlarged view at point B. According to some embodiments of this application, the 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 part of which is disposed in the second electrode lead-out hole 211g, and a part of which is located inside the first wall 211. The electrode assembly 23 also includes a plurality of second tabs 23d, which are arranged in a manner that... The polarity of all the first tabs 23c is opposite to that of all the first tabs 23c. Multiple second tabs 23d extend from the first end D1. A portion of the second tabs 23d in all the electrode assemblies 23 forms a third tab cluster 232a, and another portion of the second tabs 23d in all the electrode assemblies 23 forms a fourth tab cluster 232b. The third tab clusters 232a and 232b are arranged at intervals along the length direction Y of the first wall. The third tab cluster 232a is located on one side of the second center line C2, and the fourth tab cluster 232b is located on the other side of the second center line C2. The third tab clusters 232a and 232b are electrically connected to the second electrode lead-out component 24, respectively.

[0276] 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.

[0277] 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.

[0278] A portion of the second electrodes 23d are stacked to form a third electrode cluster 232a. The multiple second electrodes 23d of the third electrode cluster 232a are electrically connected to form a whole.

[0279] A portion of the second electrodes 23d are stacked to form a fourth electrode cluster 232b, and the multiple second electrodes 23d in the fourth electrode cluster 232b are electrically connected to form a whole.

[0280] The third anode cluster 232a and the fourth anode cluster 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 third anode cluster 232a and the fourth anode cluster 232b do not overlap.

[0281] 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 on the same side of the battery cell 20; multiple second tabs 23d form a third tab cluster 232a and a fourth tab cluster 232b. By setting 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 hole 211g along the length direction Y of the first wall, the current flowing through the second electrode lead member 24 is distributed on both sides of the second center line C2. While meeting the overcurrent requirements, the thickness of the part of the second electrode lead member 24 located inside the first wall 211 can be designed to be thinner, thereby reducing the space occupied by this part in the thickness direction Z of the first wall, 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.

[0282] 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.

[0283] In some embodiments, please refer to Figure 4An 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.

[0284] According to some embodiments of this application, 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.

[0285] 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.

[0286] 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.

[0287] 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.

[0288] 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.

[0289] 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.

[0290] 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.

[0291] 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.

[0292] 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.

[0293] 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.

[0294] 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.

[0295] 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.

[0296] 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.

[0297] 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; 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 the electrode assemblies are stacked to form a first tab cluster, and another portion of the first tabs in all the electrode assemblies are stacked to form a second tab cluster. The first electrode lead-out hole has a first center line, which is parallel to the thickness direction of the first wall. Along the length direction of the first wall, the first tab cluster and the second tab cluster are arranged at intervals. The first tab cluster is located on one side of the first center line, and the second tab cluster is located on the other side of the first center line. The first tab cluster and the second tab cluster are respectively electrically connected to the first electrode lead-out component.

2. The battery cell according to claim 1, characterized in that, The first electrode cluster is welded to the first electrode lead-out component to form a first solder mark, and the second electrode cluster is welded to the first electrode lead-out component to form a second solder mark. Along the length direction of the first wall, the first solder mark is located on one side of the first center line, and the second solder mark is located on the other side of the first center line.

3. The battery cell according to claim 1, characterized in that, At least one of the electrode assemblies has at least one first tab cluster and at least one second tab cluster.

4. The battery cell according to claim 3, characterized in that, One of the electrode assemblies has two first tab clusters, the two first tab clusters being located on both sides of the first centerline along the width direction of the first wall; and / or, one of the electrode assemblies has two second tab clusters, the two second tab clusters being located on both sides of the first centerline along the width direction of the first wall.

5. The battery cell according to claim 4, characterized in that, One of the electrode assemblies has two first tab clusters, each first tab cluster being welded to the first electrode lead-out component to form a first solder mark, the two first solder marks being located on both sides of the first centerline along the width direction of the first wall; and / or, one of the electrode assemblies has two second tab clusters, each second tab cluster being welded to the first electrode lead-out component to form a second solder mark, the two second solder marks being located on both sides of the first centerline along the width direction of the first wall.

6. The battery cell according to claim 4, characterized in that, The battery cell includes one of the electrode assemblies.

7. The battery cell according to claim 4, characterized in that, The dimension of the battery cell along the width direction of the first wall is greater than or equal to 10 mm and less than or equal to 35 mm.

8. The battery cell according to claim 3, characterized in that, All of the electrode assemblies have a first tab cluster and a second tab cluster.

9. The battery cell according to claim 8, characterized in that, The battery cell includes a plurality of the electrode components.

10. The battery cell according to claim 3, characterized in that, The electrode assembly having at least one first tab cluster and at least one second tab cluster is a wound structure. The electrode assembly includes a first electrode sheet, the first tab cluster being composed of a portion of the first tabs wound around the first electrode sheet, and the second tab cluster being composed of another portion of the first tabs wound around the first electrode sheet.

11. The battery cell according to claim 3, characterized in that, The electrode assembly having at least one first tab cluster and at least one second tab cluster is a wound structure. The electrode assembly includes a first electrode sheet, each turn of the first electrode sheet having two first tabs, one of which is used to form a first tab cluster, and the other of which is used to form a second tab cluster.

12. The battery cell according to claim 10, characterized in that, The electrode assembly having at least one first tab cluster and at least one second tab cluster includes a first central surface perpendicular to the width direction of the first wall; The first electrode cluster and the second electrode cluster are located on opposite sides of the first central surface.

13. The battery cell according to claim 4, characterized in that, The electrode assembly having two first tab clusters and two second tab clusters is a wound structure. The electrode assembly includes a first electrode sheet. Each turn of the first electrode sheet with the first tabs has four first tabs. Two of the four first tabs are used to form the first tab cluster, and the other two of the four first tabs are used to form the second tab cluster.

14. The battery cell according to claim 13, characterized in that, The electrode assembly having two first electrode clusters and two second electrode clusters includes a first central surface perpendicular to the width direction of the first wall; The two first electrode clusters are located on opposite sides of the first central plane; and / or, the two second electrode clusters are located on opposite sides of the first central plane.

15. The battery cell according to claim 3, characterized in that, The electrode assembly having two first tab clusters and two second tab clusters is a stacked structure. The electrode assembly includes a plurality of first electrodes stacked along the width direction of the first wall. Each first electrode has a first tab. The first tabs of some of the first electrodes constitute the first tab cluster, and the first tabs of other parts of the first electrodes constitute the second tab cluster.

16. The battery cell according to claim 3, characterized in that, The electrode assembly having two first tab clusters and two second tab clusters is a stacked structure. The electrode assembly includes a plurality of first electrodes stacked along the width direction of the first wall. Each first electrode has at least two first tabs. At least one of all the first tabs is used to form a first tab cluster, and at least another of all the first tabs is used to form a second tab cluster.

17. The battery cell according to claim 1, characterized in that, The number of electrode assemblies is multiple, and the multiple electrode assemblies are stacked along the width direction of the first wall; All first electrode clusters are formed by at least one of all the electrode components, and all second electrode clusters are formed by at least another of all the electrode components.

18. The battery cell according to claim 17, 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.

19. The battery cell according to claim 17, 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, and the electrode assembly includes a first electrode sheet. Each turn of the first electrode sheet has two first electrode tabs, which are located on both sides of the first center surface. Both first electrode tabs are used to form a first electrode tab cluster or a second electrode tab cluster.

20. The battery cell according to claim 17, characterized in that, The electrode assembly has a stacked structure and includes a plurality of 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.

21. The battery cell according to claim 1, 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, 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, and the first adapter is disposed between the first wall and the main body. The first electrode tab cluster and the second electrode tab cluster are electrically connected to the first adapter, respectively.

22. The battery cell according to claim 21, characterized in that, The thickness of the first adapter is T, which satisfies 0.4mm≤T≤2.5mm.

23. The battery cell according to claim 21, 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.

24. The battery cell according to claim 1, 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.

25. The battery cell according to claim 1, 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.

26. The battery cell according to claim 25, 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.

27. The battery cell according to claim 26, characterized in that, The thickness of the first connecting part is greater than the thickness of the second connecting part.

28. The battery cell according to claim 1, 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.

29. The battery cell according to claim 28, 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 form a third tab cluster, and another portion of the second tabs in all the electrode assemblies form a fourth tab cluster. The third tab cluster and the fourth tab cluster are arranged at intervals along the length direction of the first wall. The third tab cluster is located on one side of the second center line, and the fourth tab cluster is located on the other side of the second center line. The third tab cluster and the fourth tab cluster are electrically connected to the second electrode lead-out component, respectively.

30. The battery cell according to any one of claims 1-29, 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.

31. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-30.

32. An electrical appliance, characterized in that, The electrical device includes a battery cell as described in any one of claims 1-30, the battery cell being used to provide electrical energy; or, the electrical device includes a battery device as described in claim 31, the battery device being used to provide electrical energy.

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