Battery cell, battery device, energy storage device, energy storage system, electric device, and charging network

Abstract

The present application discloses a battery cell, a battery device, an energy storage device, an energy storage system, an electric device, and a charging network. The battery cell comprises a casing, an electrode assembly, and an insulating member; the casing is provided with a first electrode lead-out portion; at least part of the electrode assembly is located in the casing; the electrode assembly comprises a main body portion, and a first tab portion used for being electrically connected to the first electrode lead-out portion; the main body portion comprises a central hole and a first end surface; the central hole passes through the first end surface; the first end surface comprises a first tab lead-out area and a first tab non-lead-out area; a plurality of first tabs are leaded out from the first tab lead-out area, and the plurality of first tabs form the first tab portion; the first tab non-lead-out area is located between the central hole and the first tab lead-out area; and the insulating member covers at least part of the first tab non-lead-out area.

Description

Battery cells, battery packs, energy storage devices, energy storage systems, electrical devices and charging networks Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery cell, battery device, energy storage device, energy storage system, power consumption device and charging network. Background Technology

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] A battery consists of one or more individual cells to meet different capacity requirements; however, improving the reliability of individual cells is an important research direction in battery cell technology.

[0004] The above statements are for the purpose of providing background information in relation to this application only and do not necessarily constitute prior art.

[0005] Application content

[0006] The purpose of this application is to provide a battery cell, battery device, energy storage device, energy storage system, power consumption device, and charging network that can improve the reliability of battery cell use.

[0007] The technical solution adopted in the embodiments of this application is:

[0008] In a first aspect, a battery cell is provided, including a housing, an electrode assembly, and an insulating member. The housing has a first electrode lead-out portion; at least a portion of the electrode assembly is located inside the housing; the electrode assembly includes a main body portion and a first tab portion for electrical connection with the first electrode lead-out portion; the main body portion has a central hole and a first end face, the central hole penetrating the first end face; the first end face includes a first lead-out tab region and a first non-lead-out tab region, the first lead-out tab region leading out a plurality of first tabs, the plurality of first tabs forming the first tab portion, the first non-lead-out tab region being located between the central hole and the first lead-out tab region; the insulating member covers at least a portion of the first non-lead-out tab region.

[0009] By adopting the technical solution of this embodiment, the insulating member can cover at least a portion of the first unleaded tab area, so that during the leveling process of the first tab portion, the first tab near the center hole can cover the surface of the insulating member facing away from the main body. The insulating member can prevent the first tab from being inserted backward into the main body, reducing the risk of backward insertion of the first tab and the risk of short circuit in the battery cell, which is beneficial to improving the reliability of the battery cell. In addition, the insulating member has insulating properties, and the insulating member can insulate and separate the first tab portion and the first unleaded tab area, further reducing the risk of short circuit between the first tab portion and the main body, and improving the reliability of the battery cell.

[0010] In some embodiments, the first electrode portion includes a first electrode tab portion and a second electrode tab portion, the first electrode tab portion being connected between the main body portion and the second electrode tab portion, the first electrode tab portion being located on the side of the first unleaded electrode area facing away from the central hole; the second electrode tab portion covering the surface of the insulator facing away from the main body portion.

[0011] By adopting the technical solution of this embodiment, the insulating component isolates the second tab portion and the first unleaded tab area, which reduces the risk of the first tab being inserted backward into the main body portion, reduces the short circuit risk of the battery cell, and helps to improve the reliability of the battery cell.

[0012] In some embodiments, along the axial direction of the central hole, the size of the insulating member is h1, and the size of the first pole lug is h2, wherein 0 < h1 / h2 ≤ 1, and optionally, 0.3 ≤ h1 / h2 ≤ 0.9.

[0013] By adopting the technical solution of this embodiment, it is beneficial to make the surface of the first electrode tab facing away from the main body and the surface of the second electrode tab facing away from the main body flush, which is beneficial to improve the reliability of the electrical connection between the first electrode tab and the first electrode lead-out portion, and improve the reliability of the battery cell.

[0014] In some embodiments, along the axial direction of the central hole, the size of the insulating member is h1, the size of the first pole lug is h2, and the size of the second pole lug is h3; wherein, h2 = h1 + h3.

[0015] By adopting the technical solution of this embodiment, the design of h2 = h1 + h3 makes the surface of the first tab facing away from the main body and the surface of the second tab facing away from the main body flush or nearly flush, which facilitates the electrical connection between the first tab and the first electrode lead-out part, and also helps to improve the reliability of the electrical connection between the first tab and the first electrode lead-out part, and improves the reliability of the battery cell.

[0016] In some embodiments, the size of the insulating element along the axial direction of the central hole is h1, where 0.1 mm ≤ h1 ≤ 1 mm; alternatively, 0.15 mm ≤ h1 ≤ 0.6 mm.

[0017] By adopting the technical solution of this embodiment, the risk of the first tab being inserted in reverse and the connection reliability between the first tab and the first electrode lead can be well balanced, which can effectively improve the reliability of the battery cell.

[0018] In some embodiments, the dimension of the second pole lug is h3 along the axial direction of the central hole, wherein 0.005mm≤h3≤0.8mm.

[0019] By adopting the technical solution of this embodiment, the design with h3≥0.005mm reduces the risk of the second electrode tab being welded through and reduces the risk of damage to components such as insulating parts or separators, which is beneficial to improving the reliability of the battery cell; the design with h3≤0.8mm means that the second electrode tab will not occupy a large space, which is beneficial to improving the energy density of the battery cell.

[0020] In some embodiments, the housing is provided with a second electrode lead-out portion, and the electrode assembly further includes a second electrode tab with a polarity different from that of the first electrode tab portion. The second electrode lead-out portion is electrically connected to the second electrode tab portion. The first end face includes a second lead-out electrode tab region and a second non-lead-out electrode tab region. Multiple second electrodes are led out from the second lead-out electrode tab region, and the multiple second electrodes form a second electrode tab portion. The first lead-out electrode tab region and the second lead-out electrode tab region are distributed at intervals along a first direction. A central hole is located between the first lead-out electrode tab region and the second lead-out electrode tab region. The second lead-out electrode tab region is located between the central hole and the second lead-out electrode tab region. The first direction is perpendicular to the axial direction of the central hole. An insulating member covers at least a portion of the second non-lead-out electrode tab region.

[0021] By adopting the technical solution of this embodiment, the insulating member can cover at least a portion of the second unleaded tab area, so that during the leveling process of the second tab, the second tab near the center hole can cover the surface of the insulating member facing away from the main body. The insulating member can prevent the second tab from being inserted backward into the main body, reducing the risk of backward insertion of the second tab and the risk of short circuit in the battery cell, which is beneficial to improving the reliability of the battery cell. In addition, the insulating member has insulating properties, which can insulate the second tab and the second unleaded tab area, further reducing the risk of short circuit between the second tab and the main body, and improving the reliability of the battery cell.

[0022] In some embodiments, the insulating element covers the central hole.

[0023] By adopting the technical solution of this embodiment, the insulating component simultaneously covers the first unleaded tab area, the second unleaded tab area, and the central hole, increasing the size of the insulating component. This is beneficial to improving the stability of the insulating component in the battery cell and can stably prevent the first and second tabs from being inserted backward into the main body, thereby improving the reliability of the battery cell.

[0024] In some embodiments, along the first direction, the size of the insulating member is W1, and the size of the main body is W2, wherein 0.05≤W1 / W2≤0.5; optionally, 0.15≤W1 / W2≤0.35.

[0025] By adopting the technical solution of this embodiment, the insulating component can cover at least a portion of the first and second unleaded tab areas, preventing the first and second tabs from being inserted backwards into the main body, thus improving the reliability of the battery cell. The first end face also provides good support for the insulating component, resulting in good fixing reliability. Furthermore, it allows the electrode assembly to lead out more first and second tabs, enabling current diversion from the main body and improving the overcurrent capacity of the electrode assembly, thereby enhancing the fast-charging capability of the battery cell. This design effectively balances the reliability of the battery cell and its fast-charging capability.

[0026] In some embodiments, the size of the insulating element along the first direction is W1, wherein 5mm≤W1≤15mm.

[0027] By adopting the technical solution of this embodiment, the insulating component can cover at least a portion of the first and second unleaded tab areas, preventing the first and second tabs from being inserted backwards into the main body, thus improving the reliability of the battery cell. The first end face also provides good support for the insulating component, resulting in good fixing reliability. Furthermore, it allows the electrode assembly to lead out more first and second tabs, enabling current diversion from the main body and improving the overcurrent capacity of the electrode assembly, thereby enhancing the fast-charging capability of the battery cell. This design effectively balances the reliability of the battery cell and its fast-charging capability.

[0028] In some embodiments, the second electrode lug includes a third electrode lug and a fourth electrode lug. The third electrode lug is connected between the main body and the fourth electrode lug. The third electrode lug is located on the side of the second unleaded electrode lug area facing away from the central hole. The insulating member is located between the first electrode lug and the third electrode lug. The second electrode lug and the fourth electrode lug are spaced apart, and the fourth electrode lug covers the surface of the insulating member facing away from the main body.

[0029] By adopting the technical solution of this embodiment, the insulating component isolates the fourth tab portion and the second unleaded tab area, which reduces the risk of the second tab being inserted backward into the main body portion, reduces the short circuit risk of the battery cell, and helps to improve the reliability of the battery cell.

[0030] In some embodiments, the insulating member includes a body portion and an extension portion. The body portion covers a first unleaded tab area and a second unleaded tab area. The extension portion is connected to at least one of the two opposite sides of the body portion along a second direction, which is perpendicular to the first direction and the axial direction of the central hole.

[0031] By adopting the technical solution of this embodiment, the extension portion can increase the size of the insulating member in the second direction. In the event of a misalignment of the first or second tab in the circumferential direction of the main body, the misaligned first or second tab will be flattened and cover the extension portion, thereby preventing the misaligned first or second tab from being inserted back into the main body, reducing the risk of short circuit in the battery cell, and improving the reliability of the battery cell.

[0032] In some embodiments, along the first direction, the size of the body portion is W3, and the size of the extension portion is W4, wherein W4≤W3.

[0033] By adopting the technical solution of this embodiment, the size of the extension portion does not exceed the size of the main body portion along the first direction, which helps to reduce the risk of interference between the first and second tabs and the extension portion, and improves the reliability of the battery cell.

[0034] In some embodiments, the size of the insulating element is L1 along the second direction and W1 along the first direction; wherein W1≤L1, and the second direction is perpendicular to the first direction and the axial direction of the central hole.

[0035] By adopting the technical solution of this embodiment, the design of W1≤L1 is beneficial for the insulating member to protrude from the first electrode portion and the second electrode portion along the second direction. In the event of a circumferential misalignment of the first electrode portion or the second electrode portion in the main body portion, the misaligned first electrode portion or the second electrode portion can be flattened and covered on the insulating member, thereby preventing the misaligned first electrode portion or the second electrode portion from being inserted back into the main body portion, reducing the risk of short circuit in the battery cell, and improving the reliability of the battery cell.

[0036] In some embodiments, along the second direction, the size of the insulating member is L1, and the maximum size of the first tab portion near the root of the first lead-out tab region is L2, wherein 0.6≤L2 / L1≤1, optionally 0.7≤L2 / L1≤0.9, and the second direction is perpendicular to the first direction and the axial direction of the central hole; and / or, along the second direction, the size of the insulating member is L1, and the maximum size of the third tab portion near the root of the second lead-out tab region is L3, wherein 0.6≤L3 / L1≤1, optionally 0.7≤L3 / L1≤0.9, and the second direction is perpendicular to the first direction and the axial direction of the central hole.

[0037] By adopting the technical solution of this embodiment, the misaligned first or second tab can be flattened and then covered on the insulating part, thereby preventing the misaligned first or second tab from being inserted into the main body, reducing the risk of short circuit in the battery cell, and improving the reliability of the battery cell.

[0038] In some embodiments, the size of the insulating element is L1 along the second direction, wherein 10mm≤L1≤25mm; the second direction is perpendicular to the first direction and the axial direction of the central hole.

[0039] By adopting the technical solution of this embodiment, the design of L1≥10mm allows the first and second tabs to be flattened and covered by the insulating component, preventing the first and second tabs from being inserted backward into the main body, thus improving the reliability of the battery cell. The design of L1≤25mm allows the misaligned first and second tabs to be flattened and covered by the insulating component, thereby preventing the misaligned first and second tabs from being inserted backward into the main body, reducing the risk of short circuit in the battery cell, and improving the reliability of the battery cell.

[0040] In some embodiments, a protrusion is formed on the surface of the insulating member facing away from the central hole, and the protrusion is located between the second pole lug and the fourth pole lug.

[0041] By adopting the technical solution of this embodiment, the protrusion can insulate and separate the second electrode lug and the fourth electrode lug, which helps to reduce the risk of the second electrode lug and the fourth electrode lug overlapping after flattening, reduces the short circuit risk of the battery cell, and helps to improve the reliability of the battery cell.

[0042] In some embodiments, along the direction from the main body to the first electrode ear, the side of the protrusion facing away from the main body protrudes beyond the surface of the second electrode ear facing away from the main body; and / or, along the direction from the main body to the first electrode ear, the side of the protrusion facing away from the main body protrudes beyond the surface of the fourth electrode ear facing away from the main body.

[0043] By adopting the technical solution of this embodiment, the protrusion can effectively insulate and separate the second electrode lug and the fourth electrode lug, effectively reducing the risk of the second electrode lug and the fourth electrode lug overlapping after flattening, reducing the short circuit risk of the battery cell, and helping to improve the reliability of the battery cell.

[0044] In some embodiments, the battery cell includes a first adapter and a second adapter; the first adapter is electrically connected to a first electrode lead-out portion, and the second adapter is electrically connected to a second electrode lead-out portion; the first adapter includes a first connecting portion connected to a first tab portion, and the second adapter includes a second connecting portion connected to a second tab portion; the first connecting portion covers at least a portion of the surface of the second tab portion facing away from the main body portion, and the second connecting portion covers at least a portion of the surface of the fourth tab portion facing away from the main body portion; along a first direction, the first connecting portion and the second connecting portion are spaced apart and form a first gap, and a protrusion extends into the first gap.

[0045] By adopting the technical solution of this embodiment, the arrangement of the first adapter and the second adapter facilitates the electrical connection between the first electrode tab and the first electrode lead-out portion, as well as the electrical connection between the second electrode tab and the second electrode lead-out portion. Along the first direction, the first connecting portion and the second connecting portion are spaced apart, thus insulatingly separating them and reducing the risk of short circuits in the battery cell, thereby improving the reliability of the battery cell. The protrusion extending into the first gap between the first connecting portion and the second connecting portion further improves the insulation reliability between them, reduces the risk of short circuits in the battery cell, and enhances the reliability of the battery cell.

[0046] In some embodiments, the protrusion does not extend beyond the first gap in the direction from the main body portion toward the first electrode ear portion.

[0047] By adopting the technical solution of this embodiment, the protrusion does not protrude beyond the first gap, which can reduce the risk of the protrusion interfering with other components and improve the reliability of the battery cell.

[0048] In some embodiments, along the first direction, the size of the protrusion is W5, the size of the insulating member is W1, and 0.02≤W5 / W1≤0.4.

[0049] By adopting the technical solution of this embodiment, the design of W5 / W1≥0.02 enables the protrusion to stably separate the flattened second electrode lug and the second electrode lug, reducing the short circuit risk of the battery cell and improving the reliability of the battery cell; the design of W5 / W1≤0.4 can reduce the space occupied by the protrusion, which is conducive to reducing the interference risk between the protrusion and the first connection part and the second connection part, and is conducive to improving the reliability of the battery cell.

[0050] In some embodiments, along the first direction, the size of the protrusion is W5, where 0.5mm ≤ W5 ≤ 5mm.

[0051] By adopting the technical solution of this embodiment, the design of W5≥0.5mm enables the protrusion to stably separate the flattened second electrode lug and the second electrode lug, reducing the short circuit risk of the battery cell and improving the reliability of the battery cell; the design of W5≤5mm can reduce the space occupied by the protrusion, which is conducive to reducing the interference risk between the protrusion and the first connection and the second connection, and is conducive to improving the reliability of the battery cell.

[0052] In some embodiments, the insulating member has a first through hole and a first surface and a second surface that are axially opposite to each other along the central hole, the first through hole penetrating the first surface and the second surface.

[0053] By adopting the technical solution of this embodiment, the setting of the first through hole allows the electrolyte to flow into the interior of the electrode assembly through the first through hole, which is beneficial to improving the wetting effect of the battery cell; in addition, in the event of thermal runaway of the battery cell, the emissions can be quickly discharged through the first through hole, which is beneficial to improving the reliability of the battery cell.

[0054] In some embodiments, the battery cell further includes a central member that passes through a central hole.

[0055] By adopting the technical solution of this embodiment, a central component is inserted into the central hole. The central component can support the hole wall of the central hole, reducing the risk of the hole wall collapsing and improving the reliability of the battery cell.

[0056] In some embodiments, along the axial direction of the central hole, the size of the central member is H1, the size of the central hole is H2, and 0.8 ≤ H1 / H2 ≤ 1.

[0057] By adopting the technical solution of this embodiment, the design of H1 / H2≥0.8 enables the center hole to support the middle position of the center hole, reducing the risk of collapse of the center hole and improving the reliability of the battery cell. The design of H1 / H2≤1 ensures that the center component does not protrude outside the center hole, reducing the risk of interference between the center component and other components and improving the reliability of the battery cell.

[0058] In some embodiments, along a first direction, the size of the center member is E1, the size of the center hole is E2, 0.8≤E1 / E2≤0.95, and the first direction is perpendicular to the axial direction of the center hole.

[0059] By adopting the technical solution of this embodiment, the design of E1 / E2≥0.8 enables the central component to better support the hole wall of the central hole, reducing the risk of collapse of the central hole and improving the reliability of the battery cell; the design of E1 / E2≤0.95 creates a gap between the outer peripheral wall of the central component and the hole wall of the central hole, thereby facilitating the installation of the central component into the central hole.

[0060] In some embodiments, the insulating member is connected to the end of the center member near the first end face.

[0061] By adopting the technical solution of this embodiment, the insulating component and the central component are connected together. The central component can support and fix the insulating component, so that the insulating component can better prevent the first or second tab from being inserted in reverse, reduce the short circuit risk of the battery cell, and improve the reliability of the battery cell.

[0062] In some embodiments, the insulating element and the center element are an integral structure.

[0063] By adopting the technical solution of this embodiment, the central component and the insulating component are integrated into one piece, which helps to reduce production steps and lower component costs.

[0064] In some embodiments, the insulating member has a first through hole and a first surface and a second surface that are axially opposite to each other along the central hole, the first through hole penetrating the first surface and the second surface; the central member has a second through hole and a second end face and a third end face that are axially opposite to each other along the central hole, the second through hole penetrating the second end face and the third end face; the first through hole communicates with the second through hole.

[0065] By adopting the technical solution of this embodiment, the electrolyte flows through the first through hole and the second through hole to the bottom of the electrode assembly facing away from the first end face, which is beneficial to improving the wetting effect of the battery cell; in addition, in the event of thermal runaway of the battery cell, the emissions can be quickly discharged through the first through hole and the second through hole, which is beneficial to improving the reliability of the battery cell.

[0066] In some embodiments, along the first direction, the size of the center member is E1, the size of the second through hole is E3, 0.5≤E3 / E1≤0.8, and the first direction is perpendicular to the axial direction of the center hole.

[0067] By adopting the technical solution of this embodiment, the design of E3 / E1≥0.5 allows the electrolyte to pass through the second through hole, thereby wetting the electrode assembly; the design of E3 / E1≤0.8 allows the central component to stably support the hole wall of the central hole, reducing the risk of collapse of the hole wall of the central hole and improving the reliability of the battery cell; this design can better balance the wetting effect and reliability of the electrode assembly.

[0068] In some embodiments, the battery cell is a cylindrical battery cell or a prismatic battery cell.

[0069] The technical solutions of this application embodiment can be applied to cylindrical battery cells and prismatic battery cells, and have a wide range of applications.

[0070] Secondly, a battery device is provided, comprising a plurality of the aforementioned battery cells.

[0071] The battery device in this application uses the aforementioned battery cell, which has good reliability and can also help improve the reliability of the battery device.

[0072] Thirdly, an energy storage device is provided, comprising a plurality of the aforementioned battery cells or a plurality of the aforementioned battery devices, wherein the battery cells or battery devices are used to store or provide electrical energy.

[0073] The energy storage device in this application uses the aforementioned battery cells or battery devices, which have good reliability, thus improving the reliability of the energy storage device.

[0074] Fourthly, an energy storage system is provided, including a power conversion device and the aforementioned energy storage device, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

[0075] The energy storage system of this application embodiment adopts the above-mentioned energy storage device, which has good reliability and improves the reliability of the energy storage system.

[0076] Fifthly, an electrical device is provided, comprising the aforementioned battery cell, battery device, energy storage device, or energy storage system, wherein the battery cell or battery device is used to store or provide electrical energy.

[0077] The electrical device in this application embodiment uses the above-mentioned battery cell, battery device, energy storage device or energy storage system. The battery cell, battery device, energy storage device and energy storage system have good reliability, which improves the reliability of the electrical device.

[0078] In a sixth aspect, a charging network is provided, including a charging pile and the aforementioned energy storage device or energy storage system, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0079] The charging network of this application embodiment adopts the above-mentioned energy storage device or energy storage system. The energy storage device and energy storage system have good reliability, which improves the reliability of the charging network.

[0080] 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

[0081] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0082] Figure 1 is an exploded view of a battery cell provided in some embodiments of this application.

[0083] Figure 2 is a schematic diagram of the structure of the first and second tabs of the electrode assembly provided in some embodiments of this application before they are flattened.

[0084] Figure 3 is an exploded view of the electrode assembly, insulating component and center component provided in some embodiments of this application.

[0085] Figure 4 is a schematic diagram of the structure of the electrode assembly, insulating component and center component provided in some embodiments of this application.

[0086] Figure 5 is a schematic diagram of the structure of the electrode assembly, insulating component and center component provided in some embodiments of this application.

[0087] Figure 6 is a cross-sectional view along line AA in Figure 4.

[0088] Figure 7 is a magnified view of part B in Figure 6.

[0089] Figure 8 is a magnified view of point C in Figure 6.

[0090] Figure 9 is a schematic diagram of the structure of an insulating component provided in some embodiments of this application.

[0091] Figure 10 is a schematic diagram of the structure of the insulating component provided in some embodiments of this application.

[0092] Figure 11 is a schematic diagram of the structure of the insulating component provided in some embodiments of this application.

[0093] Figure 12 is a schematic diagram of the structure of the insulating component provided in some embodiments of this application.

[0094] Figure 13 is a schematic diagram of the structure of the electrode assembly, insulating component, central component, first adapter and second adapter provided in some embodiments of this application.

[0095] Figure 14 is a cross-sectional view along line DD in Figure 13.

[0096] Figure 15 is a magnified view of a portion of point E in Figure 14.

[0097] Figure 16 is a schematic diagram of the insulating component in Figure 13.

[0098] Figure 17 is a schematic diagram of the structure of the insulating component and the center component provided in some embodiments of this application.

[0099] Figure 18 is an exploded view of the insulating element and the center element provided in some embodiments of this application.

[0100] Figure 19 is a schematic diagram of the structure of the insulating component and the center component provided in some embodiments of this application.

[0101] Figure 20 is a schematic diagram of the structure of the insulating component and the central component shown in Figure 19.

[0102] Figure 21 is a cross-sectional view along line FF in Figure 20.

[0103] Figure 22 is an exploded view of a battery device provided in some embodiments of this application.

[0104] Figure 23 is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application.

[0105] Figure 24 is a schematic diagram of the structure of an energy storage system provided in some embodiments of this application.

[0106] Figure 25 is a schematic diagram of the structure of a vehicle provided in some embodiments of this application.

[0107] Figure 26 is a schematic diagram of the structure of a charging network provided in some embodiments of this application.

[0108] The following are the labeling elements in the figure:

[0109] 100. Battery cell; 110. Casing; 111. Housing; 112. End cap; 1121. First electrode lead-out portion; 1122. Second electrode lead-out portion; 120. Electrode assembly; 121. Main body; 1211. Center hole; 1212. First end face; 12121. First lead-out tab area; 12122. First non-lead-out tab area; 12123. Second lead-out tab area; 12124. Second non-lead-out tab area; 122. First tab portion; 122a. First tab; 1221. First tab sub-part; 1222. Second tab sub-part; 123. Second tab portion; 123a. Second tab; 1231. Third tab sub-part; 1232. Fourth tab sub-part; 130. Insulator; 131. Body portion; 132. Extension portion; 133. Protrusion Part; 130a, First surface; 130b, Second surface; 130c, First through hole; 141, First adapter; 1411, First connecting part; 142, Second adapter; 1421, Second connecting part; 140a, First gap; 150, Center part; 150a, Second end face; 150b, Third end face; 150c, Second through hole; 200, Housing; 210, First housing; 220, Second housing; 1000, Vehicle; 1100, Battery device; 1200, Controller; 1300, Motor; 2000, Energy storage device; 2100, Cabinet; 2200, Battery cluster; 3000, Energy storage system; 3100, Power conversion device; 3200, Power generation equipment; 4000, Charging network; 4100, Charging pile; 4200, Connector. Detailed Implementation

[0110] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0111] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0112] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0113] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments in any suitable manner.

[0114] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0115] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces). "Several" means one or more, unless otherwise explicitly specified.

[0116] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0117] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0118] In the description of the embodiments of this application, unless otherwise expressly specified and limited, when an element is referred to as "fixed to" or "set on" another element, it may be directly on or indirectly on the other element. When an element is referred to as "connected to" another element, it may be directly connected to or indirectly connected to the other element.

[0119] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0120] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0121] A single battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0122] A single battery cell typically includes an electrode assembly and a housing for containing the electrode assembly. The electrode assembly typically includes a positive electrode, a negative electrode, and a separator that separates the positive and negative electrodes.

[0123] In some battery cells, the electrode sheets (such as the positive or negative electrode sheets mentioned above) and the separator are wound together and a central hole is formed in the middle of the electrode assembly. Multiple turns of the electrode sheet lead out with tabs. Multiple tabs located on the same side are stacked together to form a tab section. The tab section is then flattened (e.g., by kneading or smoothing) to facilitate electrical connection with the electrode leads on the casing. However, during the flattening process, the tabs, especially those near the central hole, are prone to being inserted backwards between the electrode sheets, increasing the risk of short circuit in the battery cell and hindering the improvement of the battery cell's reliability.

[0124] In view of this, the present application provides a technical solution that uses an insulating component to block the tabs in the tab portion from being inserted between the electrode plates, thereby reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0125] In some embodiments, the battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc. The battery cell can be cylindrical, flat, cuboid, or other shapes. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, prismatic battery cells, and pouch battery cells.

[0126] Referring to FIG1, an embodiment of this application provides a battery cell 100, which includes a housing 110 and an electrode assembly 120, at least a portion of which is housed within the housing 110.

[0127] The outer casing 110 may be a hollow structure, with an internal space for accommodating the electrode assembly 120 and the electrolyte. Exemplarily, the outer casing 110 of the battery cell 100 is a cylindrical casing.

[0128] In some embodiments, the housing 110 may be a metal housing, such as a steel housing, an aluminum housing, a composite metal housing (e.g., a copper-aluminum composite housing), or other metal housings. Alternatively, the housing may also be a non-metallic housing, such as a plastic housing (e.g., polypropylene).

[0129] In some embodiments, the housing 110 includes a housing 111 and an end cap 112, the housing 111 having an opening, and the end cap 112 being connected to the housing 111 and covering the opening;

[0130] The housing 111 is a component used to fit the end cap 112 to form an internal cavity of the battery cell, which can be used to accommodate the electrode assembly 120, electrolyte, and other components.

[0131] The housing 111 and the end cap 112 can be separate components. For example, an opening can be provided on the housing 111, and the end cap 112 can be used to close the opening to form an internal cavity of the battery cell 100.

[0132] The casing 111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0133] The shape of the end cap 112 can be adapted to the shape of the housing 111 to fit the housing 111. The material of the end cap 112 can be the same as or different from the material of the housing 111. Optionally, the end cap 112 can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.), so that the end cap 112 is not easily deformed when subjected to compression and impact, so that the battery cell 100 can have higher structural strength and improved reliability.

[0134] The end cap 112 is connected to the housing 111 by welding, bonding, snap-fitting or other means.

[0135] The housing 111 may be open at one end or open at both ends. In some examples, the housing 111 may be a structure with an opening on one side, and an end cap 112 is provided and covers the housing 111. In other examples, the housing 111 may also be a structure with openings on both sides, and two end caps 112 are provided, with the two end caps 112 respectively covering the two openings of the housing 111.

[0136] Electrode assembly 120 is a component in battery cell 100 where electrochemical reactions occur. Electrode assembly 120 may be entirely housed within housing 110 or partially housed within housing 110. For example, a portion of the tabs of electrode assembly 120 may extend outside housing 110.

[0137] Alternatively, the electrode assembly 120 may be entirely housed within the housing 110.

[0138] In some embodiments, the electrode assembly 120 includes a positive electrode and a negative electrode. During the charging and discharging of the battery cell 100, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive and negative electrode.

[0139] In some embodiments, the positive electrode sheet may include a positive current collector and a layer of positive active material disposed on at least one surface of the positive current collector.

[0140] In some examples, the positive current collector includes a positive current collector body and multiple positive electrode tabs, with the positive electrode tabs protruding from the end face of the positive current collector body and the multiple positive electrode tabs spaced apart along the length of the positive electrode sheet.

[0141] As an example, the positive electrode tab can be directly led out from the end face of the positive current collector, or it can be fixed to the positive current collector by welding or other methods. The positive active material layer is disposed on the surface of the positive current collector, and may also cover the root of the positive electrode tab near the positive current collector. The positive current collector and the positive active material layer disposed thereon form the positive electrode body of the positive electrode sheet.

[0142] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material layer is disposed on either or both of the two opposite surfaces of the positive current collector.

[0143] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. 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 alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0144] As an example, the positive electrode active material layer includes a positive electrode active material, which may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 (e.g., lithium nickel cobalt aluminum oxides, such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0145] In some embodiments, the negative electrode sheet may include a negative electrode current collector and a layer of negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0146] In some examples, the negative current collector includes a negative current collector body and multiple negative current collector tabs, with the negative current collector tabs protruding from the end face of the negative current collector body and the multiple negative current collector tabs spaced apart along the length of the negative electrode sheet.

[0147] As an example, the negative electrode tab can be directly led out from the end face of the negative electrode current collector, or it can be fixed to the negative electrode current collector by welding or other methods. A negative electrode active material layer is disposed on the surface of the negative electrode current collector, and this layer can also cover the root of the negative electrode tab near the negative electrode current collector. The negative electrode current collector and the negative electrode active material layer disposed on it form the negative electrode body of the negative electrode sheet.

[0148] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material layer is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0149] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, nickel alloys, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0150] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 100. 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 battery cell 100 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0151] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0152] In some embodiments, the electrode assembly 120 further includes a separator disposed between the positive and negative electrode plates. The separator serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0153] In some embodiments, the separator is a separator membrane. The separator membrane in this application can be any known porous structure separator membrane with good chemical and mechanical stability.

[0154] 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. The separator can be a separate component located between the positive and negative electrode plates, or it can be attached to the surface of the positive or negative electrode plate. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0155] In some embodiments, the battery cell 100 further includes an electrolyte that acts as a conductor of ions between the positive and negative electrodes. The electrolyte used in this application can be selected as needed. The electrolyte can be liquid, gel-like, or solid.

[0156] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0157] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0158] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0159] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell 100, such as additives that improve the overcharge / fast charge performance of the battery cell 100, additives that improve the high-temperature performance of the battery cell 100, additives that improve the low-temperature performance of the battery cell 100, etc.

[0160] In some embodiments, the gel electrolyte comprises a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0161] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0162] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0163] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0164] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0165] In some embodiments, the positive electrode, negative electrode, and separator are wound together.

[0166] The electrode assembly 120 has a wound structure. Exemplarily, the positive electrode, the separator, and the negative electrode are wound into a cylindrical wound structure.

[0167] In some embodiments, please refer to Figures 2-8 together. The battery cell 100 includes a housing 110, an electrode assembly 120, and an insulating member 130. The housing 110 has a first electrode lead-out portion 1121. At least a portion of the electrode assembly 120 is located within the housing 110. The electrode assembly 120 includes a main body portion 121 and a first tab portion 122 for electrical connection with the first electrode lead-out portion 1121. The main body portion 121 has a central hole 1211 and a first end face 1212. 11 penetrates the first end face 1212; the first end face 1212 includes a first lead-out tab region 12121 and a first non-lead-out tab region 12122, the first lead-out tab region 12121 leads out a plurality of first tabs 122a, the plurality of first tabs 122a form a first tab portion 122, the first non-lead-out tab region 12122 is located between the central hole 1211 and the first lead-out tab region 12121; the insulating member 130 covers at least a portion of the first non-lead-out tab region 12122.

[0168] As an example, the first electrode lead-out portion 1121 is used to connect to an external circuit to enable charging or discharging of the battery cell 100. Exemplarily, when multiple battery cells 100 are assembled into a group, the first electrode lead-out portion 1121 is used to connect to a busbar component.

[0169] In some examples, the first electrode lead-out portion 1121 can refer to various structures.

[0170] For example, the first electrode lead-out portion 1121 can be an electrode terminal disposed on the housing 110. The electrode terminal is formed independently of the housing 110 and assembled together during the production process of the battery cell 100. The electrode terminal is insulatedly disposed on the end cap 112 or the housing 111.

[0171] As an example, the first electrode lead-out portion 1121 may also be part of the housing 110. For example, the first electrode lead-out portion 1121 may be the end cap 112 of the housing 110, or the first electrode lead-out portion 1121 may be the end wall of the housing 111 opposite to the end cap 112.

[0172] As an example, the first electrode lead-out portion 1121 and the first electrode tab portion 122 can be connected in various ways.

[0173] For example, the first electrode lead-out portion 1121 is directly connected to the first electrode tab portion 122.

[0174] For example, the first electrode lead-out portion 1121 and the first electrode tab portion 122 are connected by an adapter (e.g., a first adapter 141, etc.); for example, one end of the adapter is welded or riveted to the first electrode lead-out portion 1121, and the other end of the adapter is welded to the first electrode tab portion 122.

[0175] As an example, the positive electrode, negative electrode and separator are wound to form a cylindrical wound structure. The positive electrode body, negative electrode body and separator together form the body 121 of the electrode assembly 120. After winding, multiple positive electrode sheets are stacked together to form a positive electrode tab, and multiple negative electrode sheets are stacked together to form a negative electrode tab.

[0176] As an example, the first electrode tab 122a can be a positive electrode tab, and the first electrode tab portion 122 can be a positive electrode tab portion.

[0177] As an example, the first electrode tab 122a can be a negative electrode tab, and the first electrode tab portion 122 can be a negative electrode tab portion.

[0178] As an example, the positive electrode tab and the negative electrode tab can be located at the same end of the main body 121, or they can be located at opposite ends of the main body 121.

[0179] As an example, the electrode assembly 120 is wound using a winding needle. After winding, the electrode assembly 120 is separated from the winding needle. The through hole left by the winding needle is the center hole 1211. The center hole 1211 penetrates the two end faces of the main body 121 that are relatively distributed along the winding axis. The extension direction of the winding axis can refer to the axial direction of the center hole 1211 (see the Z direction in Figure 2).

[0180] As an example, among the two end faces of the main body 121 that are axially opposite to each other along the central hole 1211, the end face from which the first pole ear 122 is led out is the first end face 1212.

[0181] As an example, after the first electrode tab 122 is leveled, when viewed along the axial direction of the central hole 1211, a portion of the first electrode tab 122 overlaps with a portion of the first end face 1212. This overlapping area is divided into two regions based on the first electrode tab 122a closest to the central hole 1211. The region closest to the central hole 1211 is the first non-leading electrode tab region 12122, and the region farther from the central hole 1211 is the first electrode tab 122a lead-out portion. The first lead-out electrode tab region 12121 and the first non-leading electrode tab region 12122 are located on the same side of the central hole 1211. The first non-leading electrode tab region 12122 is located between the central hole 1211 and the first lead-out electrode tab region 12121. Multiple first electrodes tabs 122a are led out from the first lead-out electrode tab region 12121.

[0182] As an example, insulation component 130 can refer to a component made of insulating material, which can be ceramic, plastic, or other materials. For example, polypropylene (PP), polyphenylene sulfide (PPS), polyimide (PI), polyethylene (PE), silicon carbide (SiC), ceramics, etc.

[0183] As an example, the insulating element 130 may cover a portion of the first unleaded tab region 12122 or the entire first unleaded tab region 12122.

[0184] By adopting the technical solution of this embodiment, the insulating member 130 can cover at least a portion of the first unleaded tab area 12122, so that during the leveling process of the first tab portion 122, the first tab 122a near the center hole 1211 can cover the surface of the insulating member 130 facing away from the main body portion 121. The insulating member 130 can prevent the first tab 122a from being inserted backward into the main body portion 121, reducing the risk of the first tab 122a being inserted backward, reducing the risk of short circuit in the battery cell 100, and improving the reliability of the battery cell 100. In addition, the insulating member 130 has insulating properties, and the insulating member 130 can insulate and separate the first tab portion 122 and the first unleaded tab area 12122, further reducing the risk of short circuit between the first tab portion 122 and the main body portion 121, and improving the reliability of the battery cell 100.

[0185] In some embodiments, the first tab portion 122 includes a first tab portion 1221 and a second tab portion 1222. The first tab portion 1221 is connected between the main body portion 121 and the second tab portion 1222. The first tab portion 1221 is located on the side of the first unleaded tab area 12122 that is away from the central hole 1211. The second tab portion 1222 covers the surface of the insulating member 130 that is away from the main body portion 121.

[0186] As an example, during the leveling process, the first electrode ear 122 will move toward the central hole 1211, so that a portion of the first electrode ear 122 will cover the surface of the insulating member 130 facing away from the main body 121, while the other portion of the first electrode ear 122 is located on one side of the insulating member 130; wherein, the portion of the first electrode ear 122 covering the insulating member 130 is called the second electrode ear sub-part 1222, and the portion of the first electrode ear 122 not covering the insulating member 130 is called the first electrode ear sub-part 1221.

[0187] As an example, the first pole lug 1221 and the second pole lug 1222 can be separated by the edge of the insulating member 130 near the first pole lug 1221 (see the dashed line M in Figures 5 and 7).

[0188] By adopting the technical solution of this embodiment, the insulating member 130 insulates and separates the second tab sub-part 1222 and the first unleaded tab area 12122, which can reduce the risk of the first tab 122a being inserted upside down into the main body 121, reduce the short circuit risk of the battery cell 100, and help improve the reliability of the battery cell 100.

[0189] In some embodiments, the adapter covers the surface of the first electrode lug 1221 facing away from the main body 121 and is welded to the adapter; or, the adapter covers the surface of the second electrode lug 1222 facing away from the main body 121 and is welded to the adapter; or, the adapter simultaneously covers the surface of the first electrode lug 1221 facing away from the main body 121 and the surface of the second electrode lug 1222 facing away from the main body 121, and both the first electrode lug 1221 and the second electrode lug 1222 are welded to the adapter.

[0190] In some embodiments, along the axial direction of the central hole 1211, the size of the insulating member 130 is h1, and the size of the first pole lug 1221 is h2, wherein 0 < h1 / h2 ≤ 1.

[0191] In some examples, along the axial direction of the central hole 1211, the dimension h1 of the insulating element 130 may refer to the distance between two surfaces of the insulating element 130 that are relatively distributed along the axial direction of the central hole 1211.

[0192] As an example, the insulating element 130 has a sheet-like structure and is laid flat in the first unleaded tab area 12122 along the axial direction of the central hole 1211. The dimension h1 of the insulating element 130 may refer to the thickness of the insulating element 130. Of course, in other examples, the insulating element 130 may also be of other shapes.

[0193] In some examples, along the axial direction of the central hole 1211, the dimension h2 of the first pole lug 1221 may refer to the distance between the surface of the first pole lug 1221 facing away from the main body 121 and the first end face 1212.

[0194] In some examples, the value of h1 / h2 is 1 or any number between 0 and 1. For example, the value of h1 / h2 can be, but is not limited to, 0.1, 0.3, 0.5, 0.8, 0.9, or 1.

[0195] In some examples, the design of 0 < h1 / h2 ≤ 1 makes the dimension h1 of the insulating member 130 along the axial direction of the central hole 1211 smaller than or equal to the dimension h2 of the first electrode lug 1221. This reduces the risk of the insulating member 130 protruding from the surface of the first electrode lug 1221 facing away from the main body 121. It also makes it easier for the surfaces of the first electrode lug 1221 and the second electrode lug 1222 to be flush with the surfaces of the second electrode lug 1221 facing away from the main body 121. This reduces the gap between the adapter and the first electrode lug 1221, allowing the first electrode lug 1221 to be stably welded to the adapter. This improves the reliability of the electrical connection between the first electrode lug 122 and the first electrode lead 1121, and enhances the reliability of the battery cell 100.

[0196] By adopting the technical solution of this embodiment, it is beneficial to make the surface of the first electrode tab 1221 facing away from the main body 121 and the surface of the second electrode tab 1222 facing away from the main body 121 flush, which is beneficial to improve the reliability of the electrical connection between the first electrode tab 122 and the first electrode lead-out portion 1121, and improve the reliability of the battery cell 100.

[0197] In some embodiments, 0.3 ≤ h1 / h2 ≤ 0.9.

[0198] In some examples, with an h1 / h2 ≥ 0.3 design, the insulating component 130 is easy to manufacture. The insulating component 130 can support the second electrode lug 1222, facilitating welding of the second electrode lug 1222 to the adapter. The insulating component 130 can also insulate the second electrode lug 1222 from the main body 121, reducing the risk of the first electrode lug 122a being inserted incorrectly, reducing the short-circuit risk of the battery cell 100, and improving the reliability of the battery cell 100. With an h1 / h2 ≤ 0.9 design, the insulating component 130 will not occupy excessive space. The space provided allows the surface of the first electrode tab 1221 facing away from the main body 121 and the surface of the second electrode tab 1222 facing away from the main body 121 to be flush, reducing the gap between the first electrode tab 1221 and the adapter, and reducing the gap between the adapter and the first electrode tab 1221. This allows the first electrode tab 1221 to be stably welded to the adapter, and also helps to improve the reliability of the electrical connection between the first electrode tab 122 and the first electrode lead-out portion 1121, thereby improving the reliability of the battery cell 100.

[0199] By adopting the technical solution of this embodiment, the risk of the first tab 122a being inserted in reverse and the connection reliability between the first tab 122 and the first electrode lead-out portion 1121 can be well balanced, and the reliability of the battery cell 100 can be effectively improved.

[0200] In some embodiments, along the axial direction of the central hole 1211, the size of the insulating member 130 is h1, the size of the first pole lug 1221 is h2, and the size of the second pole lug 1222 is h3; wherein, h2 = h1 + h3.

[0201] Along the axial direction of the central hole 1211, the dimension h3 of the second pole lug 1222 can refer to the distance between the surface of the second pole lug 1222 facing away from the main body 121 and the insulating member 130.

[0202] In some examples, the design of h2 = h1 + h3 makes the surface of the first tab 1221 facing away from the main body 121 and the surface of the second tab 1222 facing away from the main body 121 flush or nearly flush. This reduces the risk of the first tab 1221 and the second tab 1222 fitting better onto the adapter and being welded to the adapter, improving the stability of the welding between the first tab 122 and the adapter, improving the reliability of the electrical connection between the first tab 122 and the first electrode lead 1121, and improving the reliability of the battery cell 100.

[0203] By adopting the technical solution of this embodiment, the design of h2 = h1 + h3 makes the surface of the first tab 1221 facing away from the main body 121 and the surface of the second tab 1222 facing away from the main body 121 flush or nearly flush, which facilitates the electrical connection between the first tab 122 and the first electrode lead-out portion 1121, and also helps to improve the reliability of the electrical connection between the first tab 122 and the first electrode lead-out portion 1121, thereby improving the reliability of the battery cell 100.

[0204] In some embodiments, the dimension of the insulating element 130 along the axial direction of the central hole 1211 is h1, where 0.1 mm ≤ h1 ≤ 1 mm.

[0205] In some examples, the value of h1 is 0.1mm, 1mm, or any number between 0.1mm and 1mm. For example, the value of h1 can be, but is not limited to, 0.1mm, 0.15mm, 0.3mm, 0.5mm, 0.6mm, 0.8mm, 0.9mm, or 1mm.

[0206] In some examples, with an h1 ≥ 0.1 mm design, the insulating component 130 is easy to manufacture. The insulating component 130 can support the second electrode lug 1222, facilitating welding with the adapter. The insulating component 130 can insulate the second electrode lug 1222 from the main body 121, reducing the risk of the first electrode lug 122a being inserted backwards, reducing the risk of short circuit in the battery cell 100, and improving the reliability of the battery cell 100. With an h1 ≤ 1 mm design, the insulating component 130 will not occupy too much space, which is conducive to the flushing of the surface of the first electrode lug 1221 facing away from the main body 121 and the surface of the second electrode lug 1222 facing away from the main body 121. This reduces the gap between the first electrode lug 1221 and the adapter, and also reduces the gap between the adapter and the first electrode lug 1221, allowing the first electrode lug 1221 to be stably welded to the adapter. This also helps to improve the reliability of the electrical connection between the first electrode lug 122 and the first electrode lead 1121, thus improving the reliability of the battery cell 100.

[0207] By adopting the technical solution of this embodiment, the risk of the first tab 122a being inserted in reverse and the connection reliability between the first tab 122 and the first electrode lead-out portion 1121 can be well balanced, and the reliability of the battery cell 100 can be effectively improved.

[0208] In some embodiments, 0.15mm ≤ h1 ≤ 0.6mm.

[0209] By adopting the technical solution of this embodiment, the size of the insulating component 130 is more reasonably designed, which can more effectively improve the reliability of the battery cell 100.

[0210] In some embodiments, the size of the second pole lug 1222 along the axial direction of the central hole 1211 is h3, wherein 0.005mm≤h3≤0.8mm.

[0211] In some examples, the value of h3 is 0.005mm, 0.8mm, or any number between 0.005mm and 0.8mm. For example, the value of h3 can be, but is not limited to, 0.005mm, 0.1mm, 0.3mm, 0.5mm, 0.7mm, or 0.8mm.

[0212] In some examples, the design with h3 ≥ 0.005 mm reduces the risk of the second electrode tab 1222 being soldered through and reduces the risk of damage to components such as the insulation component 130 or the separator, which is beneficial to improving the reliability of the battery cell 100. The design with h3 ≤ 0.8 mm means that the second electrode tab 1222 will not occupy a large space, which is beneficial to improving the energy density of the battery cell 100.

[0213] By adopting the technical solution of this embodiment, the reliability and energy density of the battery cell 100 can be well balanced.

[0214] In some embodiments, please refer to FIG8. The housing 110 is provided with a second electrode lead-out portion 1122. The electrode assembly 120 further includes a second electrode tab portion 123 with a polarity different from that of the first electrode tab portion 122. The second electrode lead-out portion 1122 is electrically connected to the second electrode tab portion 123. The first end face 1212 includes a second lead-out electrode tab region 12123 and a second non-lead-out electrode tab region 12124. A plurality of second electrodes tabs 123a are led out from the second lead-out electrode tab region 12123. The plurality of second electrodes tabs 123a are shaped as follows: The second tab portion 123 is formed, the first lead-out tab region 12121 and the second lead-out tab region 12123 are distributed at intervals along a first direction, the central hole 1211 is located between the first lead-out tab region 12121 and the second lead-out tab region 12123, and the second non-lead-out tab region 12124 is located between the central hole 1211 and the second lead-out tab region 12123, the first direction is perpendicular to the axial direction of the central hole 1211; the insulating member 130 covers at least a portion of the second non-lead-out tab region 12124.

[0215] As an example, the second electrode lead-out portion 1122 may refer to a component provided on the housing 110 for electrical connection with an external circuit. The first electrode lead-out portion 1121 and the second electrode lead-out portion 1122 are insulated from each other. The first electrode lead-out portion 1121 and the second electrode lead-out portion 1122 are used to connect the external circuit, the second electrode tab portion 123 and the first electrode tab portion 122, thereby forming a circuit to realize the charging and discharging of the battery cell 100.

[0216] As an example, the second electrode lead-out portion 1122 can refer to various structures.

[0217] For example, when the first electrode lead-out portion 1121 is an electrode terminal provided on the outer casing 110, the second electrode lead-out portion 1122 can be an electrode terminal provided on the outer casing 110, or the second electrode lead-out portion 1122 can be a casing 111 or an end cap 112; of course, it can also be other structures.

[0218] For example, when the first electrode lead-out portion 1121 is a housing 111 or an end cap 112, the second electrode lead-out portion 1122 is an electrode terminal provided on the outer casing 110.

[0219] As an example, the second electrode lead-out portion 1122 and the second electrode ear portion 123 can be connected in various ways.

[0220] For example, the second electrode lead-out portion 1122 is directly connected to the second electrode ear portion 123.

[0221] For example, the second electrode lead-out portion 1122 and the second electrode tab portion 123 are connected by an adapter (e.g., a second adapter 142, etc.); for example, one end of the adapter is welded or riveted to the second electrode lead-out portion 1122, and the other end of the adapter is welded to the second electrode tab portion 123.

[0222] As an example, the first electrode 122a can be a positive electrode, the second electrode 123a can be a negative electrode, the first electrode portion 122 can be a positive electrode portion, and the second electrode portion 123 can be a negative electrode portion.

[0223] As an example, the second electrode 123a can be a positive electrode, the first electrode 122a can be a negative electrode, the second electrode portion 123 can be a positive electrode portion, and the first electrode portion 122 can be a negative electrode portion.

[0224] As an example, after the second electrode tab 123 is leveled, when viewed along the axial direction of the central hole 1211, the second electrode tab 123 partially overlaps with the second end face 150a. This overlapping area is divided into two regions based on the second electrode tab 123a closest to the central hole 1211. The region closest to the central hole 1211 is the second non-leading electrode tab region 12124, and the region farther from the central hole 1211 is the second electrode tab 123a lead-out portion. The second non-leading electrode tab region 12124 is located between the central hole 1211 and the second lead-out electrode tab region 12123. Multiple second electrodes 123a are led out from the second lead-out electrode tab region 12123. The first lead-out tab region 12121 and the second lead-out tab region 12123 are located on opposite sides of the central hole 1211 and are spaced apart along the first direction, which can reduce the risk of short circuit due to overlap between the first tab portion 122 and the second tab portion 123; the first direction is perpendicular to the axis of the central hole 1211, and the first direction can refer to the radial direction of the main body portion 121, specifically the Y direction in Figures 2 to 8.

[0225] As an example, the first electrode ear 122 and the second electrode ear 123 are led out from the same end of the main body portion 121, and the first electrode ear 122 and the second electrode ear 123 are arranged at a radial distance along the main body portion 121.

[0226] As an example, the insulating element 130 may cover a portion of the second unleaded tab region 12124 or the entire second unleaded tab region 12124.

[0227] By adopting the technical solution of this embodiment, the insulating member 130 can cover at least a portion of the second unleaded tab area 12124, so that during the leveling process of the second tab portion 123, the second tab 123a near the center hole 1211 can cover the surface of the insulating member 130 facing away from the main body portion 121. The insulating member 130 can prevent the second tab 123a from being inserted backwards into the main body portion 121, reducing the risk of the second tab 123a being inserted backwards, reducing the risk of short circuit in the battery cell 100, and improving the reliability of the battery cell 100. In addition, the insulating member 130 has insulating properties, and the insulating member 130 can insulate the second tab portion 123 and the second unleaded tab area 12124, further reducing the risk of short circuit between the second tab portion 123 and the main body portion 121, and improving the reliability of the battery cell 100.

[0228] In some embodiments, the insulating element 130 covers the central hole 1211.

[0229] In some examples, when viewed along the axial direction of the central hole 1211, the insulating element 130 can shield the central hole 1211.

[0230] By adopting the technical solution of this embodiment, the insulating member 130 simultaneously covers the first unleaded tab area, the second unleaded tab area 12124 and the central hole 1211, increasing the size of the insulating member 130. This is beneficial to improving the stability of the insulating member 130 in the battery cell 100 and can stably prevent the first tab 122a and the second tab 123a from being inserted backward into the main body 121, thereby improving the reliability of the battery cell 100.

[0231] In some embodiments, along the first direction, the size of the insulating member 130 is W1, and the size of the main body 121 is W2, wherein 0.05≤W1 / W2≤0.5.

[0232] Along the first direction, the dimension W1 of the insulating member 130 can refer to the distance between two sides of the insulating member 130 that are relatively distributed along the first direction.

[0233] As an example, referring to Figure 9, the insulating element 130 is circular, and along the first direction, the dimension W1 of the insulating element 130 can refer to the diameter of the insulating element 130.

[0234] As an example, referring to Figures 10-12, the insulating element 130 is square or rectangular. Along the first direction, the dimension W1 of the insulating element 130 may refer to the width of the insulating element 130.

[0235] As an example, referring to Figure 5, the main body 121 is a cylindrical structure, and along the first direction, the dimension W2 of the main body 121 can refer to the outer diameter of the main body 121.

[0236] In some examples, the value of W1 / W2 can be 0.05, 0.5, or any value between 0.05 and 0.5. For example, the value of W1 / W2 can be, but is not limited to, 0.05, 0.1, 0.15, 0.2, 0.3, 0.35, 0.4, and 0.5.

[0237] The design with W1 / W2 ≥ 0.05 allows the insulating component 130 to cover at least a portion of the first unleaded tab area 12122 and at least a portion of the second unleaded tab area 12124, preventing the first tab 122a and the second tab 123a from being inserted backwards into the main body 121, thus improving the reliability of the battery cell 100. The first end face 1212 also provides good support for the insulating component 130, resulting in good fixation reliability. The design with W1 / W2 ≤ 0.5 increases the area of ​​the first lead-out tab area 12121 and the second lead-out tab area 12123, allowing the electrode assembly 120 to lead out more of the first tab 122a and the second tab 123a. This enables the current in the main body 121 to be diverted, improving the overcurrent capacity of the electrode assembly 120 and the fast-charging capability of the battery cell 100. This design effectively balances the reliability and fast-charging capability of the battery cell 100.

[0238] In some embodiments, 0.15 ≤ W1 / W2 ≤ 0.35.

[0239] By adopting the technical solution of this embodiment, the reliability of the battery cell 100 and its fast charging capability can be better balanced.

[0240] In some embodiments, the size of the insulating member 130 along the first direction is W1, wherein 5mm≤W1≤15mm.

[0241] In some examples, the value of W1 can be 5mm, 15mm, or any value between 5mm and 15mm. For example, the value of W1 can be, but is not limited to, 5mm, 7mm, 9mm, 11mm, 13mm, and 15mm.

[0242] The design with W1 ≥ 5mm allows the insulating component 130 to cover at least a portion of the first unleaded tab area 12122 and at least a portion of the second unleaded tab area 12124, preventing the first tab 122a and the second tab 123a from being inserted backwards into the main body 121, thus improving the reliability of the battery cell 100. The first end face 1212 also provides good support for the insulating component 130, resulting in good fixing reliability. The design with W1 ≤ 15mm increases the area of ​​the first lead-out tab area 12121 and the second lead-out tab area 12123, allowing the electrode assembly 120 to lead out more of the first tab 122a and the second tab 123a. This enables the current in the main body 121 to be diverted, improving the overcurrent capacity of the electrode assembly 120 and the fast-charging capability of the battery cell 100. This design effectively balances the reliability and fast-charging capability of the battery cell 100.

[0243] In some embodiments, the second electrode tab 123 includes a third electrode tab 1231 and a fourth electrode tab 1232. The third electrode tab 1231 is connected between the main body 121 and the fourth electrode tab 1232. The third electrode tab 1231 is located on the side of the second non-leading electrode tab area 12124 facing away from the central hole 1211. The insulating member 130 is located between the first electrode tab 1221 and the third electrode tab 1231. The second electrode tab 1222 and the fourth electrode tab 1232 are spaced apart, and the fourth electrode tab 1232 covers the surface of the insulating member 130 facing away from the main body 121.

[0244] As an example, during the leveling process, the second pole tab 123 moves toward the central hole 1211, so that a portion of the second pole tab 123 covers the surface of the insulating member 130 facing away from the main body 121, while the other portion of the second pole tab 123 is located on one side of the insulating member 130; wherein, the portion of the second pole tab 123 covering the insulating member 130 is called the fourth pole tab 1232, and the portion of the second pole tab 123 not covering the insulating member 130 is called the third pole tab 1231.

[0245] As an example, the third pole lug 1231 and the fourth pole lug 1232 can be separated by the edge of the insulating member 130 near the third pole lug 1231 (see the dashed line N in Figures 5 and 8).

[0246] By adopting the technical solution of this embodiment, the insulating member 130 insulates and separates the fourth tab sub-part 1232 and the second unleaded tab area 12124, which can reduce the risk of the second tab 123a being inserted backward into the main body part 121, reduce the short circuit risk of the battery cell 100, and help improve the reliability of the battery cell 100.

[0247] In some examples, the adapter covers the surface of the third pole lug 1231 facing away from the main body 121 and is welded to the adapter; or, the adapter covers the surface of the fourth pole lug 1232 facing away from the main body 121 and is welded to the adapter; or, the adapter simultaneously covers the surface of the third pole lug 1231 facing away from the main body 121 and the surface of the fourth pole lug 1232 facing away from the main body 121, and both the third pole lug 1231 and the fourth pole lug 1232 are welded to the adapter.

[0248] In some embodiments, as shown in Figures 11 and 12, the insulating member 130 includes a body portion 131 and an extension portion 132. The body portion 131 covers the first unleaded tab region 12122 and the second unleaded tab region 12124. The extension portion 132 is connected to at least one of the two opposite sides of the body portion 131 along a second direction, which is perpendicular to the first direction and the axial direction of the central hole 1211.

[0249] The second direction can refer to the direction perpendicular to the first direction and the axial direction of the center hole 1211, specifically the X direction in Figures 1-12.

[0250] In some examples, when the extension portion 132 is connected to one side of the main body portion 131 along the second direction, the insulating member 130 is divided into two parts along the second direction, wherein the part covering the first unleaded tab area 12122 and the second unleaded tab area 12124 is the main body portion 131, and the part protruding from the first unleaded tab area and the second unleaded tab area 12124 forms the extension portion 132.

[0251] In some examples, when the body portion 131 is connected to extension portions 132 on both sides along the second direction, the insulating member 130 is divided into three parts along the second direction. The part located in the middle and containing the first unleaded tab area 12122 and the second unleaded tab area 12124 is the body portion 131, and the parts located at both ends and protruding from the first unleaded tab area and the second unleaded tab area 12124 respectively form two extension portions 132.

[0252] As an example, the insulating member 130 is a long strip structure with rounded ends, the quadrilateral part in the middle forms the body part 131, and the semi-circular parts at both ends form two extension parts 132 respectively.

[0253] As an example, the middle part of the insulating member 130 is circular, and elongated structures extend outward from the opposite sides of the circle. The circular part in the middle forms the body part 131, and the elongated structures form the extension part 132.

[0254] By adopting the technical solution of this embodiment, the extension portion 132 can increase the size of the insulating member 130 in the second direction. In this way, if the first tab 122a or the second tab 123a is misaligned in the circumferential direction of the main body portion 121, the misaligned first tab 122a or the second tab 123a will be flattened and cover the extension portion 132, thereby preventing the misaligned first tab 122a or the second tab 123a from being inserted backward into the main body portion 121, reducing the short circuit risk of the battery cell 100, and improving the reliability of the battery cell 100.

[0255] In some embodiments, along the first direction, the size of the body portion 131 is W3, and the size of the extension portion 132 is W4, wherein W4≤W3.

[0256] Along the first direction, the dimension W3 of the body portion 131 may refer to the distance between two sides of the body portion 131 that are relatively distributed along the first direction.

[0257] Along the first direction, the dimension W4 of the extension 132 can refer to the distance between two oppositely distributed sides of the extension 132 along the first direction.

[0258] As an example, referring to Figure 11, the main body 131 is square and the extension 132 is semi-circular. Along the first direction, the dimension W3 of the main body 131 is the width of the main body 131. Along the first direction, the dimension W4 of the extension 132 can refer to the diameter of the extension 132, and W4 = W3.

[0259] As an example, referring to Figure 12, the main body 131 is circular, and the extension 132 is a long strip structure. Along the first direction, the dimension W3 of the main body 131 is the diameter of the main body 131, and along the first direction, the dimension W4 of the extension 132 is the width of the extension 132, and W4 < W3.

[0260] In some battery cells 100, after the electrode assembly 120 is wound, the first tab 122a and the second tab 123a have an arc structure. The first tab 122a and the second tab 123a are arranged opposite each other. Along the second direction, the distance between the first tab 122a and the second tab 123a is small at the two end openings and large in the middle. The insulating member 130 is located between the first tab 122a and the second tab 123a, the body part 131 is located between the first tab 122a and the second tab 123a, and the extension part 132 protrudes from the end opening between the first tab 122a and the second tab 123a. The extension part 132 is small in size, which helps to reduce the risk of interference between the first tab 122a and the second tab 123a and the extension part 132, and improves the reliability of the battery cell 100.

[0261] In some embodiments, the size of the insulating member 130 is L1 along the second direction and W1 along the first direction; wherein W1≤L1, and the second direction is perpendicular to the first direction and the axial direction of the central hole 1211.

[0262] In some examples, along the second direction, the dimension L1 of the insulating member 130 may refer to the distance between the two sides of the insulating member 130 that are relatively distributed along the second direction.

[0263] In some examples, along the first direction, the dimension W1 of the insulating member 130 may refer to the distance between two sides of the insulating member 130 that are relatively distributed along the first direction.

[0264] As an example, referring to Figure 9, the insulating element 130 is circular. Along the second direction, the dimension L1 of the insulating element 130 can refer to the diameter of the insulating element 130; along the first direction, the dimension W1 of the insulating element 130 can refer to the diameter of the insulating element 130, and W1 = L1.

[0265] As an example, referring to Figure 10, the insulating member 130 is square. Along the second direction, the dimension L1 of the insulating member 130 can refer to the length of the insulating member 130; along the first direction, the dimension W1 of the insulating member 130 can refer to the width of the insulating member 130, W1 = L1.

[0266] As an example, referring to Figure 11, the main body 131 is square, and the two ends of the main body 131 are connected to extensions 132, which are semi-circular. In the first direction, the dimension W1 of the insulating member 130 can refer to the width of the main body 131. In the second direction, the dimension L1 of the insulating member 130 can refer to the length of the main body 131 plus the sum of the diameters of the two extensions 132, where W1 < L1.

[0267] As an example, referring to Figure 12, the main body 131 is circular, and the extension 132 is a long strip structure. Along the first direction, the size W1 of the insulating member 130 is the diameter of the main body 131. Along the second direction, the size L1 of the insulating member 130 can refer to the diameter of the main body 131 plus the sum of the lengths of the two extensions 132, where W1 < L1.

[0268] By adopting the technical solution of this embodiment, the design of W1≤L1 is beneficial for the insulating member 130 to protrude from the first tab 122 and the second tab 123 along the second direction. It is also beneficial for the first tab 122a or the second tab 123a to be flattened and cover the insulating member 130 in the event of misalignment of the first tab 122a or the second tab 123a in the circumferential direction of the main body 121. This prevents the misaligned first tab 122a or the second tab 123a from being inserted backward into the main body 121, reduces the risk of short circuit of the battery cell 100, and helps to improve the reliability of the battery cell 100.

[0269] In some embodiments, along the second direction, the size of the insulating member 130 is L1, and the maximum size of the first tab portion 1221 near the root of the first lead-out tab region 12121 is L2, wherein 0.6≤L2 / L1≤1, and the second direction is perpendicular to the first direction and the axial direction of the central hole 1211.

[0270] Along the second direction, the maximum dimension L2 of the first electrode portion 1221 near the root of the first lead-out electrode region 12121 can refer to the dimension of the outermost first electrode 122a along the second direction.

[0271] As an example, the electrode assembly 120 has a cylindrical wound structure, and the outermost first electrode tab 122a has an arc structure. The chord length of the outermost first electrode tab 122a near the root of the first lead-out electrode area 12121 is the maximum dimension L2 of the first electrode tab sub-part 1221 near the root of the first lead-out electrode area 12121.

[0272] In some examples, the value of L2 / L1 can be 0.6, 1, or any value between 0.6 and 1. For example, the value of L2 / L1 can be, but is not limited to, 0.6, 0.7, 0.8, 0.9, or 1.

[0273] The design with L2 / L1 ≥ 0.6 allows the first tab 122, after being flattened, to cover the insulating member 130, thereby reducing the risk of the first tab 122a being inserted backwards into the main body 121 and improving the reliability of the battery cell 100. The design with L2 / L1 ≤ 1 increases the dimension of the insulating member 130 along the second direction, which is beneficial in the event of a circumferential misalignment of the first tab 122a in the main body 121. In this case, the misaligned first tab 122a, after being flattened, can cover the insulating member 130, thus preventing it from being inserted backwards into the main body 121, reducing the risk of short circuits in the battery cell 100, and further improving the reliability of the battery cell 100. This effectively reduces the risk of short circuits in the battery cell 100 and improves its reliability.

[0274] In some embodiments, 0.7 ≤ L2 / L1 ≤ 0.9, which can better reduce the short-circuit risk of the battery cell 100 and improve the reliability of the battery cell 100.

[0275] In some embodiments, along the second direction, the size of the insulating member 130 is L1, and the maximum size of the third electrode lug 1231 near the root of the second lead-out electrode region 12123 is L3, wherein 0.6≤L3 / L1≤1, and optionally, 0.7≤L3 / L1≤0.9; the second direction is perpendicular to the first direction and the axial direction of the central hole 1211.

[0276] Along the second direction, the maximum dimension L3 of the second tab portion 1222 near the root of the second lead-out tab region 12123 can refer to the dimension of the outermost second tab 123a along the second direction.

[0277] As an example, the electrode assembly 120 has a cylindrical winding structure, and the outermost second electrode tab 123a has an arc structure. The chord length of the outermost second electrode tab 123a near the root of the second lead-out electrode area 12123 is the maximum dimension L3 of the second electrode tab sub-part 1222 near the root of the second lead-out electrode area 12123.

[0278] In some examples, the value of L3 / L1 can be 0.6, 1, or any value between 0.6 and 1. For example, the value of L3 / L1 can be, but is not limited to, 0.6, 0.7, 0.8, 0.9, or 1.

[0279] The design with L3 / L1 ≥ 0.6 allows the second tab 123, after being flattened, to cover the insulating member 130, thereby reducing the risk of the second tab 123a being inserted backwards into the main body 121 and improving the reliability of the battery cell 100. The design with L3 / L1 ≤ 1 increases the dimension of the insulating member 130 along the second direction, which is beneficial in the event of a circumferential misalignment of the second tab 123a in the main body 121. In this case, the misaligned second tab 123a, after being flattened, can cover the insulating member 130, thus preventing it from being inserted backwards into the main body 121, reducing the risk of short circuits in the battery cell 100, and further improving the reliability of the battery cell 100. This effectively reduces the short-circuit risk of the battery cell 100 and improves its reliability.

[0280] In some embodiments, 0.7≤L3 / L1≤0.9, which can better reduce the short-circuit risk of the battery cell 100 and improve the reliability of the battery cell 100.

[0281] In some embodiments, along the second direction, the dimension of the insulating member 130 is L1, and the maximum dimension of the first tab portion 1221 near the root of the first lead-out tab region 12121 is L2, wherein 0.6≤L2 / L1≤1, and optionally, 0.7≤L2 / L1≤0.9, and the second direction is perpendicular to the first direction and the axial direction of the central hole 1211; along the second direction, the dimension of the insulating member 130 is L1, and the maximum dimension of the third tab portion 1231 near the root of the second lead-out tab region 12123 is L3, wherein 0.6≤L3 / L1≤1, and optionally, 0.7≤L3 / L1≤0.9, and the second direction is perpendicular to the first direction and the axial direction of the central hole 1211. This can better reduce the short-circuit risk of the battery cell 100 and improve the reliability of the battery cell 100.

[0282] In some embodiments, the size of the insulating member 130 is L1 along the second direction, wherein 10mm≤L1≤25mm; the second direction is perpendicular to the first direction and the axial direction of the central hole 1211.

[0283] In some examples, the value of L1 can be 10mm, 25mm, or any value between 10mm and 25mm. For example, the value of L1 can be, but is not limited to, 10mm, 15mm, 20mm, or 25mm.

[0284] The design with L1≥10mm allows the first tab 122a and the second tab 123a to be flattened and then cover the insulating member 130, preventing the first tab 122a and the second tab 123a from being inserted into the main body 121, thus improving the reliability of the battery cell 100. The design with L1≤25mm allows the misaligned first tab 122a and the second tab 123a to be flattened and then cover the insulating member 130, thereby preventing the misaligned first tab 122a and the second tab 123a from being inserted into the main body 121, reducing the risk of short circuit in the battery cell 100, and thus improving the reliability of the battery cell 100.

[0285] In some embodiments, as shown in Figures 13-16, a protrusion 133 is formed on the surface of the insulating member 130 facing away from the central hole 1211, and the protrusion 133 is located between the second pole lug 1222 and the fourth pole lug 1232.

[0286] The protrusion 133 can refer to a boss structure formed on the surface of the insulating member 130 facing away from the central hole 1211. The protrusion 133 is located between the second electrode lug 1222 and the fourth electrode lug 1232. The protrusion 133 can insulate and separate the second electrode lug 1222 and the fourth electrode lug 1232, which helps to reduce the risk of the second electrode lug 1222 and the fourth electrode lug 1232 overlapping after being leveled, reduces the short circuit risk of the battery cell 100, and helps to improve the reliability of the battery cell 100.

[0287] In some embodiments, along the direction from the main body 121 to the first electrode ear 122, the side of the protrusion 133 facing away from the main body 121 protrudes from the surface of the second electrode ear 122 facing away from the main body 121.

[0288] The direction from the main body 121 to the first pole ear 122 can be seen in the Z direction in Figures 13-16.

[0289] The side of the protrusion 133 facing away from the main body 121 protrudes from the surface of the second pole lug 1222 facing away from the main body 121. It can be understood that the distance between the end face of the protrusion 133 facing away from the main body 121 and the first end face 1212 is greater than the distance between the surface of the second pole lug 1222 facing away from the main body 121 and the first end face 1212.

[0290] By adopting the technical solution of this embodiment, the protrusion 133 protrudes from the end face of the second electrode lug 1222 facing away from the main body 121, so that the protrusion 133 can effectively insulate and separate the second electrode lug 1222 and the fourth electrode lug 1232, effectively reducing the risk of the flattened second electrode lug 1222 and the fourth electrode lug 1232 overlapping, reducing the short circuit risk of the battery cell 100, and improving the reliability of the battery cell 100.

[0291] In some embodiments, along the direction from the main body 121 to the first electrode ear 122, the side of the protrusion 133 facing away from the main body 121 protrudes from the surface of the fourth electrode ear 1232 facing away from the main body 121.

[0292] The side of the protrusion 133 facing away from the main body 121 protrudes from the surface of the fourth pole lug 1232 facing away from the main body 121. It can be understood that the distance between the end face of the protrusion 133 facing away from the main body 121 and the first end face 1212 is greater than the distance between the surface of the fourth pole lug 1232 facing away from the main body 121 and the first end face 1212.

[0293] By adopting the technical solution of this embodiment, the protrusion 133 protrudes from the end face of the fourth electrode lug 1232 facing away from the main body 121, so that the protrusion 133 can effectively insulate and separate the second electrode lug 1222 and the fourth electrode lug 1232, effectively reducing the risk of the flattened second electrode lug 1222 and the fourth electrode lug 1232 overlapping, reducing the short circuit risk of the battery cell 100, and improving the reliability of the battery cell 100.

[0294] In some embodiments, along the direction from the main body 121 to the first electrode ear 122, the side of the protrusion 133 facing away from the main body 121 protrudes from the surface of the second electrode ear 1222 facing away from the main body 121; along the direction from the main body 121 to the first electrode ear 122, the side of the protrusion 133 facing away from the main body 121 protrudes from the surface of the fourth electrode ear 1232 facing away from the main body 121.

[0295] By adopting the technical solution of this embodiment, the protrusion 133 protrudes from the end face of the fourth electrode lug 1232 facing away from the main body 121 and the surface of the second electrode lug 1222 facing away from the main body 121, so that the protrusion 133 can better insulate and separate the second electrode lug 1222 and the fourth electrode lug 1232, better reduce the risk of the flattened second electrode lug 1222 and the fourth electrode lug 1232 overlapping, reduce the short circuit risk of the battery cell 100, and help improve the reliability of the battery cell 100.

[0296] In some embodiments, the battery cell 100 includes a first adapter 141 and a second adapter 142; the first adapter 141 is electrically connected to the first electrode lead-out portion 1121, and the second adapter 142 is electrically connected to the second electrode lead-out portion 1122; the first adapter 141 includes a first connecting portion 1411 connected to the first electrode tab portion 122, and the second adapter 142 includes a second connecting portion 1421 connected to the second electrode tab portion 123; the first connecting portion 1411 covers at least a portion of the surface of the second electrode tab portion 1222 facing away from the main body portion 121, and the second connecting portion 1421 covers at least a portion of the surface of the fourth electrode tab portion 1232 facing away from the main body portion 121; along a first direction, the first connecting portion 1411 and the second connecting portion 1421 are spaced apart and form a first gap 140a, and the protrusion 133 extends into the first gap 140a.

[0297] The first adapter 141 can refer to a component that electrically connects the first electrode lug 122 and the first electrode lead-out portion 1121. The first adapter 141 is made of a conductive material, such as copper or aluminum. The first adapter 141 facilitates the electrical connection between the first electrode lead-out portion 1121 and the first electrode lug 122.

[0298] The first connecting portion 1411 may refer to the part where the first adapter 141 connects to the first electrode tab 122. The first adapter 141 may only include the first connecting portion 1411, or the first adapter 141 may include the first connecting portion 1411 and other parts, with the other parts bent relative to the first connecting portion 1411 to facilitate electrical connection between the other parts and the first electrode lead-out portion 1121.

[0299] As an example, the first connecting portion 1411 may be welded only to the first pole lug portion 1221, or the first connecting portion 1411 may be welded only to the second pole lug portion 1222, or both the first pole lug portion 1221 and the second pole lug portion 1222 may be welded to the first connecting portion 1411.

[0300] After the first tab 122a is leveled, the first connecting portion 1411 of the first adapter 141 is stacked on the first tab 122. The first connecting portion 1411 covers a part of the surface of the second tab 1222 facing away from the main body 121, or it can cover the entire surface of the second tab 1222 facing away from the main body 121. The first connecting portion 1411 can also cover the surface of the first tab 1221 facing away from the main body 121. The large coverage area of ​​the first connecting portion 1411 is beneficial to increasing the welding area between the first tab 122 and the first connecting portion 1411, which is beneficial to increasing the current flow area between the first adapter 141 and the first tab 122, and is beneficial to improving the fast charging capability of the battery cell 100.

[0301] The second adapter 142 refers to the part that electrically connects the second electrode lug 123 and the second electrode lead-out portion 1122. The second adapter 142 is made of a conductive material, such as copper or aluminum. The second adapter 142 facilitates the electrical connection between the second electrode lead-out portion 1122 and the second electrode lug 123.

[0302] The second connecting portion 1421 may refer to the part where the second adapter 142 connects to the second electrode tab 123. The second adapter 142 may only include the second connecting portion 1421, or the second adapter 142 may include the second connecting portion 1421 and other portions, with the other portions bent relative to the second connecting portion 1421 to facilitate electrical connection between the other portions and the second electrode lead-out portion 1122.

[0303] As an example, the second connecting portion 1421 may be welded only to the third pole lug portion 1231, or the second connecting portion 1421 may be welded only to the fourth pole lug portion 1232, or both the third pole lug portion 1231 and the fourth pole lug portion 1232 may be welded to the second connecting portion 1421.

[0304] After the second tab 123a is flattened, the second connecting portion 1421 of the second adapter 142 is stacked on the second tab 123. The second connecting portion 1421 covers a part of the surface of the fourth tab 1232 facing away from the main body 121, or it can cover the entire surface of the fourth tab 1232 facing away from the main body 121. The second connecting portion 1421 can also cover the surface of the third tab 1231 facing away from the main body 121. The large coverage area of ​​the second connecting portion 1421 is beneficial to increasing the welding area between the second tab 123 and the second connecting portion 1421, which is beneficial to increasing the current flow area between the second adapter 142 and the second tab 123, and is beneficial to improving the fast charging capability of the battery cell 100.

[0305] Along the first direction, the first connecting portion 1411 and the second connecting portion 1421 are spaced apart. It can be understood that the first connecting portion 1411 and the second connecting portion 1421 do not contact each other, and the gap formed between the first connecting portion 1411 and the second connecting portion 1421 is the first gap 140a.

[0306] The protrusion 133 extends into the first gap 140a. It can be understood that, along the direction from the main body 121 to the first electrode ear 122, the side of the protrusion 133 facing away from the main body 121 protrudes from the surface of the first connecting portion 1411 facing the main body 121; or, along the direction from the main body 121 to the first electrode ear 122, the side of the protrusion 133 facing away from the main body 121 protrudes from the surface of the second connecting portion 1421 facing the main body 121; or, along the direction from the main body 121 to the first electrode ear 122, the side of the protrusion 133 facing away from the main body 121 protrudes from the surface of the first connecting portion 1411 facing the main body 121 and the surface of the second connecting portion 1421 facing the main body 121.

[0307] By adopting the technical solution of this embodiment, the first adapter 141 and the second adapter 142 facilitate the electrical connection between the first tab 122 and the first electrode lead-out portion 1121, and the second tab 123 and the second electrode lead-out portion 1122. Along the first direction, the first connecting portion 1411 and the second connecting portion 1421 are spaced apart, thus insulatingly separating them and reducing the short-circuit risk of the battery cell 100, thereby improving the reliability of the battery cell 100. The protrusion 133 extends into the first gap 140a between the first connecting portion 1411 and the second connecting portion 1421, which helps improve the insulation reliability between the first connecting portion 1411 and the second connecting portion 1421, reduces the short-circuit risk of the battery cell 100, and improves the reliability of the battery cell 100.

[0308] In some embodiments, the protrusion 133 does not extend beyond the first gap 140a in the direction from the main body 121 to the first tab 122.

[0309] It is understandable that, along the direction from the main body 121 to the first electrode ear 122, the side of the protrusion 133 facing away from the main body 121 does not protrude from the surface of the first connecting portion 1411 facing away from the main body 121; or, along the direction from the main body 121 to the first electrode ear 122, the side of the protrusion 133 facing away from the main body 121 does not protrude from the surface of the second connecting portion 1421 facing away from the main body 121; or, along the direction from the main body 121 to the first electrode ear 122, the side of the protrusion 133 facing away from the main body 121 does not protrude from the surface of the first connecting portion 1411 facing away from the main body 121 and the surface of the second connecting portion 1421 facing away from the main body 121.

[0310] By adopting the technical solution of this embodiment, the protrusion 133 does not protrude out of the first gap 140a, which can reduce the risk of the protrusion 133 interfering with other components and improve the reliability of the battery cell 100.

[0311] In some embodiments, along the first direction, the size of the protrusion 133 is W5, the size of the insulating member 130 is W1, and 0.02≤W5 / W1≤0.4.

[0312] Along the first direction, the dimension W5 of the protrusion 133 can refer to the distance between two sides of the protrusion 133 that are relatively distributed along the first direction.

[0313] As an example, the protrusion 133 has an elongated structure and extends along the second direction. Along the first direction, the dimension W5 of the protrusion 133 can refer to the width of the protrusion 133.

[0314] In some examples, the value of W5 / W1 can be 0.02, 0.4, or any value between 0.02 and 0.4. For example, the value of W5 / W1 can be, but is not limited to, 0.02, 0.1, 0.2, 0.3, and 0.4.

[0315] The design with W5 / W1≥0.02 allows the protrusion 133 to stably separate the flattened second electrode lug 1222 from the second electrode lug 1222, reducing the short-circuit risk of the battery cell 100 and improving the reliability of the battery cell 100. The design with W5 / W1≤0.4 reduces the space occupied by the protrusion 133, which helps to reduce the interference risk between the protrusion 133 and the first connecting part 1411 and the second connecting part 1421, and helps to improve the reliability of the battery cell 100.

[0316] In some embodiments, along the first direction, the size of the protrusion 133 is W5, where 0.5mm≤W5≤5mm.

[0317] In some examples, the value of W5 can be 0.5mm, 5mm, or any value between 0.5mm and 5mm. For example, the value of W5 can be, but is not limited to, 0.5mm, 1mm, 2mm, 3mm, 4mm, and 5mm.

[0318] The design with W5≥0.5mm allows the protrusion 133 to stably separate the flattened second electrode tab 1222 from the second electrode tab 1222, reducing the short-circuit risk of the battery cell 100 and improving the reliability of the battery cell 100. The design with W5≤5mm reduces the space occupied by the protrusion 133, which helps to reduce the interference risk between the protrusion 133 and the first connecting part 1411 and the second connecting part 1421, and helps to improve the reliability of the battery cell 100.

[0319] In some embodiments, as shown in Figures 6 and 17, the battery cell 100 also includes a center member 150, which passes through a center hole 1211.

[0320] The center component 150 can refer to the component inserted into the center hole 1211. The center component 150 is made of insulating material, such as plastic or ceramic.

[0321] By adopting the technical solution of this embodiment, a central member 150 is inserted into the central hole 1211. The central member 150 can support the hole wall of the central hole 1211, reducing the risk of the hole wall of the central hole 1211 collapsing and improving the reliability of the battery cell 100.

[0322] In some embodiments, along the axial direction of the central hole 1211, the size of the central member 150 is H1, the size of the central hole 1211 is H2, and 0.8 ≤ H1 / H2 ≤ 1.

[0323] Along the axial direction of the center hole 1211, the dimension H1 of the center member 150 can refer to the distance between two end faces of the center member 150 that are relatively distributed along the axial direction of the center hole 1211.

[0324] Along the axial direction of the central hole 1211, the dimension H2 of the central hole 1211 can refer to the distance between the first end face 1212 and another end face disposed opposite to it.

[0325] As an example, the center member 150 is rod-shaped along the axial direction of the center hole 1211, and the dimension H1 of the center member 150 can refer to the length of the center member 150; the main body 121 has a cylindrical structure along the axial direction of the center hole 1211, and the dimension H2 of the center hole 1211 can refer to the height of the main body 121.

[0326] In some examples, the value of H1 / H2 can be 0.8, 1, or any value between 0.8 and 1. For example, the value of H1 / H2 can be, but is not limited to, 0.8, 0.9, or 1.

[0327] During the use of the battery cell 100, the middle position of the center hole 1211 along the axial direction is most prone to collapse. The design of H1 / H2≥0.8 enables the center hole 1211 to support the middle position, reducing the risk of collapse and improving the reliability of the battery cell 100. The design of H1 / H2≤1 ensures that the center component 150 does not protrude from the center hole 1211, reducing the risk of interference between the center component 150 and other components, and improving the reliability of the battery cell 100.

[0328] In some embodiments, along a first direction, the size of the center member 150 is E1, the size of the center hole 1211 is E2, 0.8≤E1 / E2≤0.95, and the first direction is perpendicular to the axial direction of the center hole 1211.

[0329] Along the first direction, the dimension E1 of the center member 150 can refer to the radial dimension of the center member 150.

[0330] Along the first direction, the dimension E2 of the center hole 1211 can refer to the radial dimension of the center hole 1211.

[0331] As an example, the center member 150 is cylindrical in shape, and along the first direction, the dimension E1 of the center member 150 may refer to the outer diameter of the center member 150; the center hole 1211 is circular or nearly circular, and along the first direction, the dimension E2 of the center hole 1211 may refer to the diameter of the center hole 1211.

[0332] In some examples, the value of E1 / E2 can be 0.8, 0.95, or any value between 0.8 and 0.95. For example, the value of E1 / E2 can be, but is not limited to, 0.8, 0.9, or 0.95.

[0333] The design with E1 / E2≥0.8 allows the center component 150 to better support the wall of the center hole 1211, reducing the risk of collapse of the center hole 1211 and improving the reliability of the battery cell 100. The design with E1 / E2≤0.95 creates a gap between the outer peripheral wall of the center component 150 and the wall of the center hole 1211, which facilitates the insertion of the center component 150 into the center hole 1211.

[0334] In some embodiments, as generally shown in Figures 17 and 18, the insulating member 130 is connected to the end of the center member 150 near the first end face 1212.

[0335] The insulating part 130 is connected to the end of the center part 150 near the first end face 1212, thereby connecting the insulating part 130 and the center part 150 to form a whole. The insulating part 130 and the center part 150 can be made by an integral manufacturing process (e.g., injection molding, 3D printing, etc.). Alternatively, the insulating part 130 and the center hole 1211 can be formed separately and then fixed together by screws, bolts, snap-fit, adhesive, etc.

[0336] By adopting the technical solution of this embodiment, the insulating member 130 is connected to the center member 150. The center member 150 can support and fix the insulating member 130, so that the insulating member 130 can better prevent the first tab 122a or the second tab 123a from being inserted in reverse, reduce the short circuit risk of the battery cell 100, and improve the reliability of the battery cell 100.

[0337] In some embodiments, the insulating element 130 and the center element 150 are an integral structure.

[0338] It is understandable that the insulating component 130 can be manufactured together with the central component 150 using an integrated manufacturing process (e.g., injection molding, 3D printing, etc.).

[0339] By adopting the technical solution of this embodiment, the central component 150 and the insulating component 130 are integrated into one piece, which helps to reduce production processes and lower component costs.

[0340] In some embodiments, as shown in Figures 19-21, the insulating member 130 has a first through hole 130c and a first surface 130a and a second surface 130b that are axially opposite to each other along the central hole 1211, and the first through hole 130c penetrates the first surface 130a and the second surface 130b.

[0341] As an example, the first surface 130a and the second surface 130b can refer to two surfaces of the insulating member 130 that are distributed opposite each other along the thickness direction. The first through hole 130c can penetrate the first surface 130a and the second surface 130b along the thickness direction of the insulating member 130, or it can penetrate the first surface 130a and the second surface 130b in a direction that is inclined relative to the thickness direction of the insulating member 130, or of course, it can be in other directions.

[0342] As an example, the first through hole 130c can be set opposite to the center hole 1211, or it can be set offset from the center hole 1211.

[0343] By adopting the technical solution of this embodiment, the setting of the first through hole 130c allows the electrolyte to flow into the interior of the electrode assembly 120 through the first through hole 130c, which is beneficial to improving the wetting effect of the battery cell 100; in addition, in the event of thermal runaway of the battery cell 100, the emissions can be quickly discharged through the first through hole 130c, which is beneficial to improving the reliability of the battery cell 100.

[0344] In some embodiments, please refer to Figures 19-21 together. The insulating member 130 has a first through hole 130c and a first surface 130a and a second surface 130b that are axially opposite to each other along the central hole 1211. The first through hole 130c penetrates the first surface 130a and the second surface 130b. The central member 150 has a second through hole 150c and a second end face 150a and a third end face 150b that are axially opposite to each other along the central hole 1211. The second through hole 150c penetrates the second end face 150a and the third end face 150b. The first through hole 130c communicates with the second through hole 150c.

[0345] The second end face 150a and the third end face 150b can refer to two end faces of the center member 150 that are axially opposite to each other; the second through hole 150c can penetrate the second end face 150a and the third end face 150b along the axial direction of the center hole 1211, or the second through hole 150c can also penetrate the second end face 150a and the third end face 150b along the axial direction relative to the center hole 1211. Of course, the second through hole 150c can also penetrate the second end face 150a and the third end face 150b in other directions.

[0346] As an example, the center member 150 and the insulating member 130 are integral structures, the second surface 130b coincides with the second end face 150a, and the first through hole 130c is directly connected to the second through hole 150c.

[0347] By adopting the technical solution of this embodiment, the electrolyte flows through the first through hole 130c and the second through hole 150c to the bottom of the electrode assembly 120 facing away from the first end face 1212, which is beneficial to improving the wetting effect of the battery cell 100. In addition, in the event of thermal runaway of the battery cell 100, the emissions can be quickly discharged through the first through hole 130c and the second through hole 150c, which is beneficial to improving the reliability of the battery cell 100.

[0348] In some embodiments, along the first direction, the size of the center member 150 is E1, the size of the second through hole 150c is E3, 0.5≤E3 / E1≤0.8, and the first direction is perpendicular to the axial direction of the center hole 1211.

[0349] Along the first direction, the dimension E3 of the second through hole 150c can refer to the radial dimension of the second through hole 150c.

[0350] As an example, the second through hole 150c is a circular hole or a near-circular hole, and along the first direction, the size E3 of the second through hole 150c can refer to the diameter of the second through hole 150c.

[0351] In some examples, the value of E3 / E1 can be 0.5, 0.8, or any value between 0.5 and 0.8. For example, the value of E3 / E1 can be, but is not limited to, 0.5, 0.6, 0.7, or 0.8.

[0352] The design with E3 / E1≥0.5 allows the electrolyte to pass through the second through hole 150c, thereby wetting the electrode assembly 120; the design with E3 / E1≤0.8 allows the center member 150 to stably support the hole wall of the center hole 1211, reducing the risk of collapse of the hole wall of the center hole 1211 and improving the reliability of the battery cell 100. This design can better balance the wetting effect and reliability of the electrode assembly 120.

[0353] In some embodiments, the battery cell 100 is a cylindrical battery cell or a prismatic battery cell.

[0354] In some examples, the battery cell 100 is a cylindrical battery cell, the casing 110 is cylindrical, and the electrode assembly 120 is cylindrical.

[0355] In some examples, the battery cell 100 is a prismatic battery cell, the casing 110 has a prismatic structure, and the electrode assembly 120 has a cylindrical or prismatic structure.

[0356] The technical solutions of this application embodiment can be applied to cylindrical battery cells and prismatic battery cells, and have a wide range of applications.

[0357] The present application will be described below with reference to some specific embodiments.

[0358] Example 1

[0359] Referring to Figures 1-10, 17, and 18, in this embodiment, the battery cell 100 is a cylindrical battery cell, which includes a housing 110, an electrode assembly 120, and an insulating member 130. The housing 110 has a first electrode lead-out portion 1121 and a second electrode lead-out portion 1122. The electrode assembly 120 is located inside the housing 110.

[0360] In this embodiment, the electrode assembly 120 includes a main body 121, a first electrode tab 122, and a second electrode tab 123. The first electrode tab 122 is electrically connected to the first electrode lead-out portion 1121, and the second electrode tab 123 is electrically connected to the second electrode lead-out portion 1122. The main body 121 has a central hole 1211 and a first end face 1212, with the central hole 1211 penetrating through the first end face 1212.

[0361] In this embodiment, the first end face 1212 includes a first lead-out tab region 12121, a first non-lead-out tab region 12122, a second lead-out tab region 12123, and a second non-lead-out tab region 12124. Multiple first tabs 122a are led out from the first lead-out tab region 12121, forming a first tab portion 122. Multiple second tabs 123a are led out from the second lead-out tab region 12123, forming a second tab portion 123. The first lead-out tab region 12121 and the second lead-out tab region 12123 are spaced apart along a first direction. The central hole 1211 is located at the first lead-out tab. Between ear region 12121 and second lead-out ear region 12123, first non-lead-out ear region 12122 is located between central hole 1211 and first lead-out ear region 12121, second non-lead-out ear region 12124 is located between central hole 1211 and second lead-out ear region 12123, the first direction is perpendicular to the axial direction of central hole 1211; first non-lead-out ear region 12122 is located between central hole 1211 and first lead-out ear region 12121; insulating member 130 covers at least a portion of the first lead-out ear region 12121; insulating member 130 covers at least a portion of the second non-lead-out ear region 12124.

[0362] In this embodiment, the first electrode tab 122 includes a first electrode tab sub-part 1221 and a second electrode tab sub-part 1222. The first electrode tab sub-part 1221 is connected between the main body 121 and the second electrode tab sub-part 1222. The first electrode tab sub-part 1221 is located on the side of the first non-lead-out electrode tab area 12122 that is away from the central hole 1211. The second electrode tab sub-part 1222 covers the surface of the insulating member 130 that is away from the main body 121.

[0363] In this embodiment, the second electrode lug 123 includes a third electrode lug 1231 and a fourth electrode lug 1232. The third electrode lug 1231 is connected between the main body 121 and the fourth electrode lug 1232. The third electrode lug 1231 is located on the side of the second non-lead-out electrode lug area 12124 facing away from the central hole 1211. The insulating member 130 is located between the first electrode lug 1221 and the third electrode lug 1231. The second electrode lug 1222 and the fourth electrode lug 1232 are spaced apart, and the fourth electrode lug 1232 covers the surface of the insulating member 130 facing away from the main body 121.

[0364] In this embodiment, the battery cell 100 also includes a center member 150, which is disposed through a center hole 1211. An insulating member 130 is connected to the end of the center member 150 near the first end face 1212, and the insulating member 130 and the center member 150 are an integral structure.

[0365] Example 2

[0366] The difference between this embodiment and Embodiment 1 is as follows: Referring to Figures 11 and 12, the insulating member 130 includes a body portion 131 and an extension portion 132. The body portion 131 covers the first unleaded tab area 12122 and the second unleaded tab area 12124. The extension portion 132 is connected to at least one side of the body portion 131 along a second direction relative to the two sides. The second direction is perpendicular to the first direction and the axial direction of the central hole 1211.

[0367] Example 3

[0368] The difference between this embodiment and Embodiment 1 is that, as shown in Figures 13-16, a protrusion 133 is formed on the surface of the insulating member 130 facing away from the central hole 1211, and the protrusion 133 is located between the second pole lug 1222 and the fourth pole lug 1232.

[0369] In this embodiment, the battery cell 100 includes a first adapter 141 and a second adapter 142; the first electrode lead-out portion 1121 and the second electrode lead-out portion 1122 are mounted on the housing 110, the first adapter 141 is electrically connected to the first electrode lead-out portion 1121, and the second adapter 142 is electrically connected to the second electrode lead-out portion 1122; the first adapter 141 includes a first connecting portion 1411 connected to the first electrode tab portion 122, and the second adapter 142 includes a second connecting portion 1421 connected to the second electrode tab portion 123. The first connecting portion 1411 covers at least a portion of the surface of the second pole lug portion 1222 facing away from the main body portion 121, and the second connecting portion 1421 covers at least a portion of the surface of the fourth pole lug portion 1232 facing away from the main body portion 121. Along the first direction, the first connecting portion 1411 and the second connecting portion 1421 are spaced apart and form a first gap 140a. The protrusion 133 extends into the first gap 140a. Along the direction from the main body portion 121 to the first pole lug portion 122, the protrusion 133 does not extend out of the first gap 140a.

[0370] Example 4

[0371] The difference between this embodiment and Embodiment 2 is as follows: Referring to Figures 19-21, the insulating member 130 has a first through hole 130c and a first surface 130a and a second surface 130b that are axially opposite to each other along the central hole 1211, and the first through hole 130c penetrates the first surface 130a and the second surface 130b; the central member 150 has a second through hole 150c and a second end face 150a and a third end face 150b that are axially opposite to each other along the central hole 1211, and the second through hole 150c penetrates the second end face 150a and the third end face 150b; the first through hole 130c communicates with the second through hole 150c.

[0372] In some embodiments, referring to FIG22, a battery device 1100 is provided, including a plurality of the above-described battery cells 100.

[0373] The battery device 1100 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 100, which are connected in series, parallel, or mixed connections via busbars.

[0374] In some examples, a battery cell assembly is typically formed by arranging multiple battery cells 100 together.

[0375] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 100 together to form an independent module. As an example, a battery module can also be formed by bundling multiple battery cells 100 together with cable ties.

[0376] In some examples, the battery device 1100 may be a battery pack, which includes a housing 200 and one or more individual battery cells housed within the housing 200.

[0377] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing 200 by fixing the battery module in the housing 200.

[0378] As an example, the battery cell assembly can also be housed in the housing 200 by directly fixing multiple battery cells 100 to the housing 200.

[0379] As an example, the housing 200 may include a first housing 210 and a second housing 220. The first housing 210 and the second housing 220 are fastened together to form a closed space inside the housing 200 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 210 may be a top cover or a bottom plate.

[0380] As an example, the housing 200 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 200 forms an enclosed space to accommodate the battery cell assembly.

[0381] In some examples, the housing 200 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 200 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 200 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0382] The battery device 1100 of this application embodiment adopts the above-mentioned battery cell 100. The battery cell 100 has good reliability, which is beneficial to improving the reliability of the battery device 1100.

[0383] In some embodiments, referring to FIG23, an energy storage device 2000 is provided, including a plurality of the above-described battery cells 100 or a plurality of the above-described battery devices 1100, wherein the battery cells 100 or battery devices 1100 are used to store or provide electrical energy.

[0384] This application provides an energy storage device 2000, including one or more battery clusters 2200 to increase the voltage and capacity of the energy storage device 2000. The battery cluster 2200 may include multiple battery devices 1100, which are connected in series via a busbar to increase the voltage of the energy storage device 2000. When the energy storage device 2000 includes multiple battery clusters 2200, the multiple battery clusters 2200 are connected in parallel to increase the capacity of the energy storage device 2000.

[0385] The energy storage device 2000 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device 2000 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 2000 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system 3000 provided in this application embodiment can be any power system that requires the use of the energy storage device 2000.

[0386] In some examples, the energy storage device 2000 is an energy storage container or an energy storage cabinet.

[0387] In some examples, the energy storage device 2000 may include a cabinet 2100 and one or more battery clusters 2200, which are housed in the cabinet 2100.

[0388] In some examples, the energy storage device 2000 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0389] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 1100 via pipelines for regulating the temperature of the individual battery cells 100.

[0390] As an example, the main control module can serve as the battery management unit for the battery cluster 2200, used to monitor and manage the battery cluster 2200. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster 2200. For example, it can control the charging and discharging current and voltage of the battery cluster 2200. The main control module includes a slave battery management unit (SBMU), a fusion switch, and other modules.

[0391] As an example, the central control module can serve as the battery management unit of the energy storage device 2000, used for monitoring and managing the device. The central control module can monitor information such as the current, voltage, power, state of charge, and temperature of the energy storage device 2000. For example, it can control the charging and discharging current and voltage of the device. As an example, the central control module includes modules such as the Insulation Monitoring Module (IMM), the Master Battery Management Unit (MBMU), the Ethernet (ETH) module, and the fiber optic conversion module.

[0392] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in the energy storage system 3000.

[0393] As an example, the power distribution module can be used to distribute power to modules in the energy storage device 2000 that require electricity.

[0394] The energy storage device 2000 of this application embodiment adopts the above-mentioned battery cell 100 or battery device 1100. The battery cell 100 and battery device 1100 have good reliability, which improves the reliability of the energy storage device 2000.

[0395] In some embodiments, referring to FIG24, an energy storage system 3000 is provided, including a power conversion device and the aforementioned energy storage device 2000, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device 2000.

[0396] In some examples, the energy storage system 3000 may include one or more energy storage devices 2000 and a power conversion system (PCS) 3100, which is connected between the power generation device 3200 and the energy storage device 2000. The power generation device 3200 generates electrical energy, which can be stored in the energy storage device 2000 via the power conversion system 3100. As an example, the power generation device 3200 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc.

[0397] The energy storage system 3000 of this application embodiment adopts the above-mentioned energy storage device 2000. The energy storage device 2000 has good reliability, which improves the reliability of the energy storage system 3000.

[0398] In some embodiments, referring to FIG25, an electrical device is provided, including the battery cell 100, the battery device 1100, the energy storage device 2000 or the energy storage system 3000 described above, wherein the battery cell 100 or the battery device 1100 is used to store or provide electrical energy.

[0399] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 100, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles 1000, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0400] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device.

[0401] 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 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. The battery can be used to power vehicle 1000; for example, the battery can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 1200 and a motor 1300. The controller 1200 is used to control the battery to supply power to the motor 1300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0402] In some embodiments of this application, the battery 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.

[0403] The electrical device in this application embodiment uses the aforementioned battery cell 100, battery device 1100, energy storage device 2000 or energy storage system 3000. The battery cell 100, battery device 1100, energy storage device 2000 and energy storage system 3000 have good reliability, thus improving the reliability of the electrical device.

[0404] In some embodiments, referring to FIG26, a charging network 4000 is provided, including a charging pile 4100 and the above-mentioned energy storage device 2000 or the above-mentioned energy storage system 3000, wherein the energy storage device 2000 is used to provide electrical energy to the charging pile 4100.

[0405] In some examples, the charging network 4000 includes a charging pile 4100 and an energy storage device 2000. The charging pile 4100 is electrically connected to the energy storage device 2000, which provides electrical energy to the charging pile 4100. The charging pile 4100 is electrically connected to a battery device 1100 in the energy storage device 2000 via a cable, and the battery device 1100 can provide its stored electrical energy to the charging pile 4100. The charging pile 4100 has one or more connectors 4200 for connecting to electrical equipment (such as a vehicle 1000) to replenish the power of the electrical equipment.

[0406] The energy storage device 2000 can be located inside the charging pile 4100 (e.g., an integrated energy storage and charging unit) or outside the charging pile 4100.

[0407] The charging network 4000 of this application embodiment adopts the above-mentioned energy storage device 2000 or energy storage system 3000. The energy storage device 2000 and energy storage system 3000 have good reliability, which improves the reliability of the charging network 4000.

[0408] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0409] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. 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, wherein, include: The outer casing is provided with a first electrode lead-out section; An electrode assembly, at least partially located within the housing; the electrode assembly includes a main body and a first tab for electrical connection with a first electrode lead-out portion; the main body has a central hole and a first end face, the central hole penetrating the first end face; the first end face includes a first lead-out tab region and a first non-lead-out tab region, the first lead-out tab region leading out a plurality of first tabs, the plurality of first tabs forming the first tab portion, the first non-lead-out tab region located between the central hole and the first lead-out tab region; An insulating element covers at least a portion of the first unleaded tab area.

2. The battery cell of claim 1, wherein: The first electrode portion includes a first electrode tab portion and a second electrode tab portion. The first electrode tab portion is connected between the main body portion and the second electrode tab portion. The first electrode tab portion is located on the side of the first unleaded electrode area facing away from the central hole. The second electrode tab portion covers the surface of the insulating member facing away from the main body portion.

3. The battery cell of claim 2, wherein: Along the axial direction of the central hole, the size of the insulating element is h1, and the size of the first pole lug is h2, wherein 0 < h1 / h2 ≤ 1, and optionally, 0.3 ≤ h1 / h2 ≤ 0.

9.

4. The battery cell of claim 2 or 3, wherein: Along the axial direction of the central hole, the size of the insulating member is h1, the size of the first electrode lug is h2, and the size of the second electrode lug is h3; wherein, h2 = h1 + h3.

5. The battery cell of any one of claims 2-4, wherein: Along the axial direction of the central hole, the dimension of the insulating element is h1, where 0.1mm ≤ h1 ≤ 1mm; optionally, 0.15mm ≤ h1 ≤ 0.6mm.

6. The battery cell of any one of claims 2-5, wherein: Along the axial direction of the central hole, the dimension of the second pole lug is h3, wherein 0.005mm≤h3≤0.8mm.

7. The battery cell of any one of claims 2-6, wherein: The outer casing is provided with a second electrode lead-out portion, and the electrode assembly further includes a second electrode tab with a polarity different from that of the first electrode tab portion. The second electrode lead-out portion is electrically connected to the second electrode tab portion. The first end face includes a second lead-out electrode tab area and a second non-lead-out electrode tab area. Multiple second electrodes are led out from the second lead-out electrode tab area, and the multiple second electrodes form the second electrode tab portion. The first lead-out electrode tab area and the second lead-out electrode tab area are distributed at intervals along a first direction. The central hole is located between the first lead-out electrode tab area and the second lead-out electrode tab area, and the second non-lead-out electrode tab area is located between the central hole and the second lead-out electrode tab area. The first direction is perpendicular to the axial direction of the central hole. The insulating member covers at least a portion of the second non-lead-out electrode tab area.

8. The battery cell of claim 7, wherein: The insulating element covers the central hole.

9. The battery cell of claim 7 or 8, wherein: Along the first direction, the size of the insulating member is W1, and the size of the main body is W2, wherein 0.05≤W1 / W2≤0.5; optionally, 0.15≤W1 / W2≤0.

35.

10. The battery cell of any one of claims 7-9, wherein: Along the first direction, the size of the insulating element is W1, wherein 5mm≤W1≤15mm.

11. The battery cell of any one of claims 7-10, wherein: The second electrode lug includes a third electrode lug and a fourth electrode lug. The third electrode lug is connected between the main body and the fourth electrode lug. The third electrode lug is located on the side of the second non-leading electrode area facing away from the central hole. The insulating member is located between the first electrode lug and the third electrode lug. The second electrode lug and the fourth electrode lug are spaced apart, and the fourth electrode lug covers the surface of the insulating member facing away from the main body.

12. The battery cell of claim 11, wherein: The insulating member includes a body portion and an extension portion. The body portion covers the first unleaded tab area and the second unleaded tab area. The extension portion is connected to at least one side of the body portion along a second direction opposite to the two sides. The second direction is perpendicular to the first direction and the axial direction of the central hole.

13. The battery cell of claim 12, wherein: Along the first direction, the size of the main body is W3, and the size of the extension is W4, wherein W4 ≤ W3.

14. The battery cell of any one of claims 11-13, wherein: Along the second direction, the dimension of the insulating element is L1; along the first direction, the dimension of the insulating element is W1. Where W1≤L1, and the second direction is perpendicular to the first direction and the axial direction of the central hole.

15. The battery cell of any one of claims 11-14, wherein: Along the second direction, the dimension of the insulating member is L1, and the maximum dimension of the root of the first electrode tab near the first lead-out electrode area is L2, wherein 0.6≤L2 / L1≤1, and optionally, 0.7≤L2 / L1≤0.9, and the second direction is perpendicular to the first direction and the axial direction of the central hole; And / or, along the second direction, the size of the insulating member is L1, and the maximum size of the root of the third tab near the second lead-out tab region is L3, wherein 0.6≤L3 / L1≤1, and optionally, 0.7≤L3 / L1≤0.9; the second direction is perpendicular to the first direction and the axial direction of the central hole.

16. The battery cell of any one of claims 11-15, wherein: Along the second direction, the dimension of the insulating element is L1, wherein 10mm≤L1≤25mm; the second direction is perpendicular to the first direction and the axial direction of the central hole.

17. The battery cell of any one of claims 11-16, wherein: The surface of the insulating member facing away from the central hole has a protrusion, which is located between the second pole lug and the fourth pole lug.

18. The battery cell of claim 17, wherein: Along the direction from the main body to the first electrode lug, the side of the protrusion facing away from the main body protrudes from the surface of the second electrode lug facing away from the main body; And / or, along the direction from the main body to the first electrode ear, the side of the protrusion facing away from the main body protrudes from the surface of the fourth electrode ear facing away from the main body.

19. The battery cell of claim 17 or 18, wherein: The battery cell includes a first adapter and a second adapter; the first adapter is electrically connected to the first electrode lead-out portion, and the second adapter is electrically connected to the second electrode lead-out portion. The first adapter includes a first connecting portion connected to the first electrode lug, and the second adapter includes a second connecting portion connected to the second electrode lug. The first connecting portion covers at least a portion of the surface of the second electrode lug facing away from the main body, and the second connecting portion covers at least a portion of the surface of the fourth electrode lug facing away from the main body. Along the first direction, the first connecting portion and the second connecting portion are spaced apart to form a first gap, and the protrusion extends into the first gap.

20. The battery cell of claim 19, wherein: Along the direction from the main body to the first electrode ear, the protrusion does not extend beyond the first gap.

21. The battery cell of any one of claims 17-20, wherein: Along the first direction, the size of the protrusion is W5, the size of the insulating element is W1, and 0.02≤W5 / W1≤0.

4.

22. The battery cell of any one of claims 17-21, wherein: Along the first direction, the size of the protrusion is W5, 0.5mm≤W5≤5mm.

23. The battery cell of any one of claims 1-22, wherein: The insulating element has a first through hole and a first surface and a second surface that are axially opposite to each other along the central hole, the first through hole penetrating the first surface and the second surface.

24. The battery cell of any one of claims 1-23, wherein: The battery cell also includes a central component, which is disposed through the central hole.

25. The battery cell of claim 24, wherein: Along the axial direction of the central hole, the size of the central component is H1, the size of the central hole is H2, and 0.8 ≤ H1 / H2 ≤ 1.

26. The battery cell of claim 24 or 25, wherein: Along the first direction, the size of the center component is E1, the size of the center hole is E2, 0.8≤E1 / E2≤0.95, and the first direction is perpendicular to the axial direction of the center hole.

27. The battery cell of any one of claims 24-26, wherein: The insulating component is connected to the end of the center component near the first end face.

28. The battery cell of claim 27, wherein: The insulating component and the central component are an integral structure.

29. The battery cell of claim 27 or 28, wherein: The insulating element has a first through hole and a first surface and a second surface that are axially opposite to each other along the central hole, the first through hole penetrating the first surface and the second surface; The central component has a second through hole and a second end face and a third end face that are axially opposite to each other along the central hole. The second through hole penetrates the second end face and the third end face. The first through hole communicates with the second through hole.

30. The battery cell of claim 29, wherein: Along the first direction, the size of the center member is E1, the size of the second through hole is E3, 0.5≤E3 / E1≤0.8, and the first direction is perpendicular to the axial direction of the center hole.

31. The battery cell of any one of claims 1-30, wherein: The battery cell is a cylindrical battery cell or a prismatic battery cell.

32. A battery device, wherein: It includes multiple battery cells according to any one of claims 1 to 31.

33. An energy storage device, wherein: It includes a plurality of battery cells according to any one of claims 1 to 31 or a plurality of battery devices according to claim 32, wherein the battery cells or the battery devices are used to store or provide electrical energy.

34. An energy storage system, wherein: It includes a power conversion device and an energy storage device as described in claim 33, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

35. An electrical device, comprising: Includes a battery cell according to any one of claims 1 to 31, a battery device according to claim 32, an energy storage device according to claim 33, or an energy storage system according to claim 34, wherein the battery cell or the battery device is used to store or provide electrical energy.

36. A charging network, wherein: It includes a charging pile and an energy storage device as described in claim 33 or an energy storage system as described in claim 34, wherein the energy storage device is used to provide electrical energy to the charging pile.

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