Battery cell, battery apparatus, energy storage apparatus, energy storage system, electrical apparatus, and charging network

Abstract

The present application discloses a battery cell, a battery apparatus, an energy storage apparatus, an energy storage system, an electrical apparatus, and a charging network. The battery cell comprises a casing, an electrode assembly, and an adapter assembly. The casing is provided with two electrode lead-out portions. The electrode assembly has two tabs having different polarities. The adapter assembly comprises an insulating member and two adapter members spaced apart from one another, each adapter member comprising a first connection portion and a second connection portion connected to one another, and the second connection portions of the two adapter members being respectively electrically connected to the two electrode lead-out portions. The first connection portions of the two adapter members are respectively welded to the two tabs, forming two welding marks. The insulating member comprises a first insulating portion and a second insulating portion which are connected, and the first insulating portion is located between the first connection portions of the two adapter members. The first connection portions each have a first surface and a second surface which are oppositely arranged, and at least one of the first surface and the second surface is covered with the second insulating portion. The second insulating portion is provided with a clearance area to allow for the corresponding welding marks.

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, comprising a housing, an electrode assembly, and an adapter assembly. The housing has two electrode leads. At least a portion of the electrode assembly is located within the housing, and the electrode assembly includes a main body and two tabs of different polarities, with the two tabs extending from the same end of the main body. The adapter assembly includes an insulating member and two spaced-apart adapters. Each adapter includes a first connecting portion and a second connecting portion connected to each other. The second connecting portions of the two adapters are electrically connected to the two electrode leads, respectively. The first connecting portions of the two adapters are spaced apart along a first direction to form a first gap, the first direction being perpendicular to a second direction, the second direction being the axial direction of the main body. The first connecting portions of the two adapters are welded to the two tabs, respectively, to form two solder marks. The insulating member includes a first insulating portion and a second insulating portion connected to each other, the first insulating portion being located in the first gap. The first connecting portion has a first surface and a second surface disposed opposite to each other along a second direction, at least one of the first surface and the second surface being covered by the second insulating portion. The second insulating portion has a clearance area for avoiding corresponding solder marks.

[0009] By adopting the technical solution of this embodiment, the first insulating part of the insulating component is located in the first gap, that is, the first insulating part is located between the first connecting parts of the two adapters. This can insulate and separate the first connecting parts of the two adapters, reducing the short-circuit risk of the two adapters and improving the capacity utilization of the battery cell. In addition, the second insulating part of the insulating component can cover the first surface and / or the second surface of the first connecting part. At the same time, the second insulating part has a avoidance area to avoid solder marks. The design of the avoidance area can reduce the restriction of the welding area between the first connecting part and the electrode on the second insulating part, so that the connection area between the second insulating part and the first connecting part can be set to be larger. This can effectively improve the connection reliability between the insulating component and the first connecting part, improve the connection reliability of the first connecting parts of the two adapters, improve the synchronous bending of the two adapters, reduce the tensile force between the adapters and the electrode, improve the welding reliability between the adapters and the electrode, and improve the reliability of the battery cell. It can also make the first connecting part and the electrode have a larger welding area, improve the overcurrent capacity of the first connecting part and the electrode, and improve the fast charging performance of the battery cell. This design can simultaneously ensure the connection stability between the first connecting parts of the two adapters and the fast charging performance of the individual battery cells.

[0010] In some embodiments, along the first direction, the maximum size of the second insulating portion is W1, and the distance between the corresponding solder mark and the first gap is S, wherein W1≥S.

[0011] By adopting the technical solution of this embodiment, the second insulating part can protrude from the edge of the solder stamp toward the first gap, and the second insulating part can cover the area of ​​the first connecting part located on the side of the solder stamp near or away from the second connecting part, thereby effectively increasing the connection area between the first connecting part and the second insulating part and improving the connection reliability between the insulating part and the adapter.

[0012] In some embodiments, the second insulating portion has a clearance groove for avoiding corresponding solder marks, the clearance groove forming a clearance area.

[0013] By adopting the technical solution of this embodiment, the material of the second insulation part can be saved, the manufacturing cost can be reduced, and more welding area can be reserved for the first connection part, which is conducive to improving the overcurrent capacity between the first connection part and the electrode tab and improving the fast charging performance of the battery cell.

[0014] In some embodiments, along the direction of the first insulating portion pointing to the corresponding solder mark, the distance between the two groove sidewalls that are relatively distributed along a third direction increases, and the third direction is perpendicular to the first and second directions.

[0015] By adopting the technical solution of this embodiment, more welding area can be reserved for the first connecting part and the electrode, which is conducive to increasing the welding area of ​​the first connecting part and the electrode, improving the current carrying capacity of the first connecting part and the electrode, and improving the fast charging capability of the battery cell. At the same time, there is also a large connection area between the first connecting part and the second insulating part, which effectively improves the connection reliability between the insulating component and the adapter.

[0016] In some embodiments, the two sidewalls of the clearance grooves, which are distributed opposite to each other along a third direction, are arranged at an angle.

[0017] By adopting the technical solution of this embodiment, the clearance groove can better avoid the corresponding solder marks, so that there is a larger welding area between the first connection part and the electrode, which improves the current carrying capacity between the first connection part and the electrode, and can also save the material of the insulating parts and reduce the manufacturing cost; in addition, the clearance groove has a simple structure and is easy to process and manufacture.

[0018] In some embodiments, the angle between the two sidewalls of the clearance grooves that are distributed opposite each other along a third direction is α, wherein the range is 0°<α≤160°; optionally, 70°≤α≤140°.

[0019] By adopting the technical solution of this embodiment, it is beneficial to reserve more welding area for the first connecting part and the electrode, increase the welding area of ​​the first connecting part and the electrode, improve the current carrying capacity of the first connecting part and the electrode, and improve the fast charging capability of the battery cell; it can also make the first connecting part and the second insulating part have a larger connection area, improve the connection reliability between the insulating component and the first connecting part. This design can better balance the connection reliability between the insulating component and the first connecting part and the current carrying capacity between the first connecting part and the electrode.

[0020] In some embodiments, the clearance grooves are arranged parallel to the two groove sidewalls that are relatively distributed along a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0021] By adopting the technical solution of this embodiment, the clearance groove has a regular structure and is easy to process and manufacture.

[0022] In some embodiments, the second insulating portion includes a first insulator portion, a second insulator portion, and a third insulator portion. The first insulator portion and the second insulator portion are located on opposite sides of corresponding solder marks distributed along a third direction. The third insulator portion is located between the first insulating portion and the corresponding solder mark and is connected between the first insulator portion and the second insulator portion. The opposing sides of the first insulator portion and the side of the third insulator portion facing away from the first insulating portion together form a clearance groove, and the third direction is perpendicular to the first direction and the second direction.

[0023] By adopting the technical solution of this embodiment, the first insulator portion and the second insulator portion are distributed on both sides of the solder stamp along the third direction, so that the areas of the second connection portion at both ends along the third direction are respectively covered by the first insulator portion and the second insulator portion. At the same time, the area of ​​the second connection portion between the solder stamp and the first insulator portion is also covered by the third insulator portion. This can effectively increase the connection area of ​​the first connection portion and the second insulator portion, improve the connection reliability of the adapter and the insulator, and also provide a larger welding area for the first connection portion and the electrode tab.

[0024] In some embodiments, along the first direction, the maximum size of the second insulating portion is W1, and the minimum size of the third insulator portion is W2, wherein 0.02≤W2 / W1≤0.2, and optionally, 0.1≤W2 / W1≤0.15.

[0025] By adopting the technical solution of this embodiment, the clearance groove will not extend to the first insulating part, and no hole will appear between the first connecting parts of the two adapters. This is beneficial to improving the insulation reliability between the first connecting parts of the two adapters and improving the reliability of the battery cell. It is also beneficial to reserve more welding area between the first connecting part and the electrode, increase the welding area between the first connecting part and the electrode, increase the current carrying capacity of the first connecting part and the electrode, and improve the fast charging capability of the battery cell. This design can better balance the insulation reliability between the two adapters and the current carrying capacity between the first connecting part and the electrode.

[0026] In some embodiments, the second insulating portion has a clearance hole for avoiding corresponding solder marks, the clearance hole forming a clearance area.

[0027] By adopting the technical solution of this embodiment, the design of the avoidance hole, with the second insulating part surrounding the solder mark, is beneficial to increase the connection area of ​​the first connecting part and the second insulating part, improve the connection reliability of the adapter and the insulating part, and also avoid the solder mark, providing a larger welding area for the first connecting part and the electrode.

[0028] In some embodiments, the avoidance area extends to the first insulation portion.

[0029] By adopting the technical solution of this embodiment, more welding areas can be reserved for the first connecting part and the electrode, thereby increasing the welding area of ​​the first connecting part and the electrode, improving the current carrying capacity of the first connecting part and the electrode, and improving the fast charging performance of the battery cell. In addition, the avoidance area extends to the first insulating part, which can save the material of the insulating component and reduce the manufacturing cost of the insulating component.

[0030] In some embodiments, along the first direction, the maximum dimension of the second insulating portion is W1, wherein 1mm≤W1≤10mm, and optionally, 1.5mm≤W1≤8mm.

[0031] By adopting the technical solution of this embodiment, the second insulating part and the first connecting part have a larger connection area, which improves the connection stability between the first connecting part and the second insulating part; it also helps to reduce the manufacturing cost of the second insulating part, and it is less likely to interfere with other components, thus improving the reliability of the battery cell. This design can better balance the connection stability between the first connecting part and the second insulating part, the manufacturing cost of the insulating part, and the risk of interference between the second insulating part and other components.

[0032] In some embodiments, the width of the first gap is W3, wherein 0.5mm≤W3≤10mm, and optionally, 2mm≤W3≤5mm.

[0033] By adopting the technical solution of this embodiment, a larger insulation gap and a longer creepage distance are achieved between the first connecting parts of the two adapters, reducing the short-circuit risk of the first connecting parts and improving the reliability of the battery cells. It also allows for more welding areas between the first connecting parts and the tabs, increasing the welding area and overcurrent capacity of the first connecting parts and the tabs, thus improving the fast-charging performance of the battery cells. This design effectively balances the insulation effect between the first connecting parts of the two adapters and the welding area between the first connecting parts and the tabs.

[0034] In some embodiments, the side of the first connecting portion facing away from the first insulating portion includes an arcuate cylindrical surface, the diameter of which is... Along the third direction, the dimension of the insulating element is L, where, Optionally, The third direction is perpendicular to the first and second directions.

[0035] By adopting the technical solution of this embodiment, the insulating component and the first connecting portion have a larger connection area, improving the connection reliability between the insulating component and the first connecting portion, and also reliably insulating and separating the first connecting portions of the two adapters; it also reduces the risk of interference between the insulating component and other components, improving the reliability of the battery cell. This design can better balance the insulation effect between the first connecting portions of the two adapters, the connection reliability between the insulating component and the first connecting portion, and the reliability of the battery cell.

[0036] In some embodiments, the first surface is disposed away from the main body portion, and the first surface is covered with a second insulating portion.

[0037] By adopting the technical solution of this embodiment, the connection area between the insulating component and the first connecting part can be increased, which is beneficial to improving the connection reliability between the insulating component and the first connecting part; in addition, the first surface is covered with a second insulating part, which is located on the side of the first connecting part away from the main body, which can reduce the risk of interference between the second insulating part and the main body or the tab.

[0038] In some embodiments, the size of the second insulating portion covering the first surface along the second direction is T1, wherein 0.1mm≤T1≤1mm, and optionally, 0.2mm≤T1≤0.6mm.

[0039] By adopting the technical solution of this embodiment, the second insulating part can be stably connected to the first surface, improving the connection reliability between the insulating part and the first connecting part. Furthermore, it facilitates the processing and manufacturing of the second insulating part (e.g., injection molding). It also reduces the space occupied by the second insulating part, which is beneficial for improving the space occupied by the electrode assembly and increasing the energy density of the battery cell. This design effectively balances the connection reliability between the first connecting part and the insulating part, the processing and manufacturing of the insulating part, and the energy density of the battery cell.

[0040] In some embodiments, the first surface is disposed away from the main body portion, and the second surface is covered with a second insulating portion.

[0041] By adopting the technical solution of this embodiment, the connection area between the insulating component and the first connecting part can be increased, which is beneficial to improving the connection reliability between the insulating component and the first connecting part.

[0042] In some embodiments, the size of the second insulating portion covering the second surface along the second direction is T2, wherein 0.05mm≤T2≤1mm, and optionally, 0.1mm≤T2≤0.5mm.

[0043] By adopting the technical solution of this embodiment, the second insulating portion can be stably connected to the second surface, improving the connection reliability between the insulating component and the first connecting portion. Furthermore, it facilitates the processing and manufacturing of the second insulating portion (e.g., injection molding); it also reduces the space occupied by the second insulating portion, which is beneficial for improving the space occupied by the electrode assembly and increasing the energy density of the battery cell. This design can better balance the connection reliability between the first connecting portion and the insulating component, the processing and manufacturing of the insulating component, and the energy density of the battery cell. In some embodiments, both the first and second surfaces are covered with the second insulating portion.

[0044] In some embodiments, both the first surface and the second surface are covered with a second insulating portion.

[0045] By adopting the technical solution of this embodiment, second insulating parts are provided on both sides of the first connecting part. The insulating part can clamp the first connecting part, which can effectively improve the connection reliability of the first connecting part and the insulating part, and is conducive to improving the reliability of the battery cell.

[0046] In some embodiments, the first surface is disposed away from the main body portion, and along the second direction, the size of the second insulating portion covering the first surface is T1, and the size of the second insulating portion covering the second surface is T2, where T1≤T2.

[0047] By adopting the technical solution of this embodiment, the design of T1≤T2 can reduce the space occupied by the insulating component, which is beneficial to improving the space occupied by the electrode assembly and increasing the energy density of the battery cell. In addition, when the tab is located between the first connecting part and the main body, the smaller T1 design can reduce the risk of interference between the tab and the second insulating part covering the second surface, facilitate the welding of the tab to the first connecting part, and also help improve the welding reliability of the tab to the first connecting part.

[0048] In some embodiments, 0.05 ≤ T2 / T1 ≤ 1, and optionally, 0.2 ≤ T2 / T1 ≤ 0.8.

[0049] By adopting the technical solution of this embodiment, the second insulating part can be stably connected to the second surface, improving the connection reliability between the insulating component and the first connecting part. Furthermore, it facilitates the processing and manufacturing of the second insulating part (e.g., injection molding). It also reduces the space occupied by the second insulating part covering the second surface, which is beneficial for improving the space occupied by the electrode assembly and increasing the energy density of the battery cell. This design effectively balances the connection reliability between the first connecting part and the insulating component, the processing and manufacturing of the insulating component, and the energy density of the battery cell.

[0050] In some embodiments, the insulating member further includes a third insulating portion along a third direction. The third insulating portion is located on the side of the first connecting portion away from the second connecting portion. The second insulating portion covering the second surface is connected to one side of the third insulating portion, and the second insulating portion covering the first surface is connected to the other side of the third insulating portion. The third direction is perpendicular to the first direction and the second direction.

[0051] By adopting the technical solution of this embodiment, the third insulating part connects the second insulating part connected to the first surface and the second surface, so that the insulating member can better cover the first connecting part and improve the connection reliability between the insulating member and the first connecting part.

[0052] In some embodiments, along a third direction, the distance between the side of the third insulating portion facing away from the second connecting portion and the side of the first connecting portion facing away from the second connecting portion is T3, wherein 0.1mm≤T3≤1mm, and optionally, 0.2mm≤T3≤0.6mm.

[0053] By adopting the technical solution of this embodiment, the third insulating part can be stably connected to the first connecting part, improving the connection reliability between the insulating part and the first connecting part. Furthermore, it facilitates the processing and manufacturing of the third insulating part (e.g., injection molding). It also reduces the space occupied by the third insulating part and the risk of interference between the third insulating part and other components, thus improving the reliability of the battery cell. This design effectively balances the connection reliability between the first connecting part and the insulating part, the processing and manufacturing of the insulating part, and the risk of interference between the third insulating part and other components.

[0054] In some embodiments, the first connecting portion is provided with a connecting hole, and the insulating member includes a fourth insulating portion, which is connected to the second insulating portion and passes through the connecting hole.

[0055] By adopting the technical solution of this embodiment, the fourth insulating part of the insulating member is inserted through the connection hole, which can enhance the connection reliability between the second insulating part and the first connecting part and improve the reliability of the battery cell.

[0056] In some embodiments, a second insulating portion is covered by a first surface and a second surface, the second insulating portion covering the first surface is connected to one end of a fourth insulating portion, and the second insulating portion covering the second surface is connected to the other end of a fourth insulating portion.

[0057] By adopting the technical solution of this embodiment, the fourth insulating part connects the second insulating parts located on opposite sides of the first connecting part, making it difficult for the first connecting part to detach from the two second insulating parts, effectively strengthening the connection reliability between the second insulating part and the first connecting part, and improving the reliability of the battery cell.

[0058] In some embodiments, the insulating member further includes a first blocking portion, a first surface covered with a second insulating portion, one end of a fourth insulating portion connected to the second insulating portion, and the other end of the fourth insulating portion connected to the first blocking portion, the first blocking portion being used to prevent the fourth insulating portion from dislodging from the connecting hole; and / or, the insulating member further includes a second blocking portion, a second surface covered with the second insulating portion, one end of the fourth insulating portion connected to the second insulating portion, and the other end of the fourth insulating portion connected to the second blocking portion, the first blocking portion being used to prevent the fourth insulating portion from dislodging from the connecting hole.

[0059] By adopting the technical solution of this embodiment, the size of the first blocking part and / or the second blocking part can be set to be smaller, so that the fourth insulating part is not easy to come out of the connection hole. This can save materials, reduce the risk of interference between the insulating part and other components, and improve the reliability of the battery cell.

[0060] In some embodiments, the diameter of the connecting hole is d, wherein 0.5mm≤d≤5mm, and optionally 1.2mm≤d≤5mm.

[0061] By adopting the technical solution of this embodiment, the fourth insulating part can be stably connected to the second connecting part, improving the connection reliability between the insulating part and the first connecting part. In addition, it also facilitates the processing and manufacturing of the fourth insulating part. It can also reduce the area occupied by the connecting hole on the first connecting part, improve the current carrying capacity of the adapter, and reduce the impact on the welding area of ​​the first connecting part and the electrode, improving the current carrying capacity of the first connecting part and the electrode, and improving the fast charging performance of the battery cell. This design can better balance the connection reliability between the first connecting part and the insulating part, the current carrying capacity of the adapter, and the welding area between the first connecting part and the electrode.

[0062] In some embodiments, the first connecting portion includes a first connecting sub-portion and a second connecting sub-portion connected to each other. The first connecting sub-portion is welded to the electrode tab to form a solder mark, and the second connecting sub-portion is covered with a second insulating portion. Along the second direction, the size of the first connecting sub-portion is t1, and the size of the second connecting sub-portion is t2, wherein t1 < t2.

[0063] By adopting the technical solution of this embodiment, the design of t1 < t2 can reduce the welding power when welding the first connecting part and the electrode, reduce the residual thermal stress at the welding position of the first connecting part and the electrode, reduce the risk of cracking in the weld pool area, and help improve the reliability of the battery cell. The thickness t2 of the second connecting part is thicker, which also helps to improve the current carrying capacity of the first connecting part and improve the fast charging performance of the battery cell. The thickness t1 of the first connecting part is small, which helps to reduce space occupation and improve the structural compactness of the battery cell.

[0064] In some embodiments, 0.1 ≤ t1 / t2 ≤ 0.9; alternatively, 0.4 ≤ t1 / t2 ≤ 0.8.

[0065] By adopting the technical solution of this embodiment, the first connecting part has good current-carrying capacity, which is beneficial to improving the fast-charging performance of the battery cell and facilitating the processing and manufacturing of the first connecting part. It also helps to reduce the welding power during the welding of the first connecting part and the electrode tab, reduce residual thermal stress at the solder joint, lower the risk of welding cracking, improve the welding quality of the first connecting part and the electrode tab, and thus improve the reliability of the battery cell. This design can better balance the welding quality of the first connecting part and the electrode tab with the current-carrying capacity of the battery cell.

[0066] In some embodiments, 0.1mm ≤ t1 ≤ 0.7mm, and optionally, 0.2mm ≤ t1 ≤ 0.5mm.

[0067] By adopting the technical solution of this embodiment, the first connecting part has good current-carrying capacity, which is beneficial to improving the fast-charging performance of the battery cell and facilitating the processing and manufacturing of the first connecting part. It also helps to reduce the welding power during the welding of the first connecting part and the electrode tab, reduce residual thermal stress at the solder joint, lower the risk of welding cracking, improve the welding quality of the first connecting part and the electrode tab, and thus improve the reliability of the battery cell. This design can better balance the welding quality of the first connecting part and the electrode tab with the current-carrying capacity of the battery cell.

[0068] In some embodiments, the insulating element and the first connecting portion of the two adapters are integrally injection molded.

[0069] By adopting the technical solution of this embodiment, the connection operation between the insulating component and the adapter is simple, reducing manufacturing costs. In addition, the connection between the insulating component and the first connecting part has good reliability, which is beneficial to improving the reliability of the battery cell.

[0070] In some embodiments, the outer casing is provided with a liquid injection hole, and the first insulating part is provided with a first through hole at a position corresponding to the liquid injection hole.

[0071] By adopting the technical solution of this embodiment, the electrolyte flows into the electrode assembly in a timely manner through the injection hole and the first through hole, thereby improving the wetting speed of the electrode assembly and improving the performance of the battery cell.

[0072] In some embodiments, along a third direction, the first through hole penetrates the side of the first insulating portion away from the second connecting portion, and the third direction is perpendicular to the first direction and the second direction.

[0073] By adopting the technical solution of this embodiment, the area of ​​the first through hole can be increased, the resistance of electrolyte flowing into the electrode assembly can be reduced, and the electrolyte can flow into the electrode assembly quickly through the injection hole and the first through hole, thereby improving the wetting speed of the electrode assembly and improving the performance of the battery cell.

[0074] In some embodiments, the electrode assembly has a central hole, and a second through hole is provided at a position corresponding to the central hole in the first insulating portion.

[0075] By adopting the technical solution of this embodiment, in the event of thermal runaway in a battery cell, the emissions inside the battery cell can be discharged in a timely manner through the central hole and the second through hole, which is beneficial to improving the reliability of the battery cell. In addition, the electrolyte can also flow into the central hole through the second through hole, which is beneficial to improving the wetting speed of the electrode assembly and improving the performance of the battery cell.

[0076] In some embodiments, the housing includes a housing and an end cap, the electrode assembly is located inside the housing, the end cap closes to the opening of the housing, and two electrode leads are provided on the end cap.

[0077] By adopting the technical solution of this embodiment, the outer casing adopts the structure of end cap and shell, the structure of the outer casing is simple and it is also convenient to assemble the battery cell; in addition, the two electrode leads are located on the end cap, which is also convenient to connect to the external circuit.

[0078] In some embodiments, the battery cell is a cylindrical battery cell or a prismatic battery cell.

[0079] 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.

[0080] Secondly, a battery device is provided, comprising a plurality of the aforementioned battery cells.

[0081] The battery device in this application uses the aforementioned battery cells, which have good reliability and fast charging performance, thus improving the reliability and performance of the battery device.

[0082] 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.

[0083] The energy storage device in this application embodiment uses the above-mentioned battery cell or battery device. The battery device has good reliability and performance, which improves the reliability and performance of the energy storage device.

[0084] 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.

[0085] The energy storage system of this application embodiment adopts the above-mentioned energy storage device, which has good reliability and performance, thereby improving the reliability and performance of the energy storage system.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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

[0091] 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.

[0092] Figure 1 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0093] Figure 2 is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application.

[0094] Figure 3 is a structural schematic diagram of the end cap and adapter assembly provided in some embodiments of this application.

[0095] Figure 4 is a structural schematic diagram of the end cap and adapter assembly provided in some embodiments of this application.

[0096] Figure 5 is a structural schematic diagram of the end cap and adapter assembly provided in some embodiments of this application.

[0097] Figure 6 is an exploded view of the end cap and adapter assembly provided in some embodiments of this application.

[0098] Figure 7 is a structural schematic diagram of the end cap and adapter assembly provided in some embodiments of this application.

[0099] Figure 8 is a cross-sectional view along line AA in Figure 7.

[0100] Figure 9 is a cross-sectional view along line BB in Figure 7.

[0101] Figure 10 is a cross-sectional view of the end cap and adapter assembly provided in some embodiments of this application along line AA in Figure 7.

[0102] Figure 11 is a cross-sectional view of the end cap and adapter assembly provided in some embodiments of this application along line AA in Figure 7.

[0103] Figure 12 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0104] Figure 13 is a cross-sectional view along line CC in Figure 12.

[0105] Figure 14 is a magnified view of part D in Figure 13.

[0106] Figure 15 is an exploded view of a battery device provided in some embodiments of this application.

[0107] Figure 16 is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application.

[0108] Figure 17 is a schematic diagram of the structure of an energy storage system provided in some embodiments of this application.

[0109] Figure 18 is a structural schematic diagram of a vehicle provided in some embodiments of this application.

[0110] Figure 19 is a schematic diagram of the structure of a charging network provided in some embodiments of this application.

[0111] The following are the labeling elements in the figure:

[0112] 100. Battery cell; 110. Casing; 110a. Electrode lead-out portion; 110b. Liquid filling hole; 111. Housing; 112. End cap; 120. Electrode assembly; 120a. Center hole; 121. Main body portion; 122. Electrode tab; 130. Adapter assembly; 131. Insulator; 131a. First gap; 1311. First insulating portion; 1311a. First through hole; 1311b. Second through hole; 1312. Second insulating portion; 1312a. Clearance groove; 1312a1. Groove side wall; 1312a2. Hole bottom surface; 1312b. Clearance area; 13121. First insulator portion; 13122. Second insulator portion; 13123. Third insulator portion; 1313. Third insulating portion; 1314. Fourth insulating portion; 1315. First blocking portion; 1316. Second 132. Blocking part; 1321. Adapter; 1321. First connecting part; 1321a. Solder mark; 1321b. First surface; 1321c. Second surface; 1321d. Arc-shaped cylindrical surface; 1321e. Connecting hole; 13211. First connecting sub-part; 13212. Second connecting sub-part; 1322. Second connecting part; 140. Separator; 140a. Third 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

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] In some battery cells, the outer casing includes an end cap and a housing. The electrode assembly is located inside the housing, and the end cap is fitted onto the housing. The end cap has two electrode leads. Two tabs (positive and negative tabs) are led out from the same end of the electrode assembly. The two tabs are connected to the two electrode leads through two adapters. The adapters include a first connecting part and a second connecting part that are connected to each other. The first connecting part is welded to the tabs, and the second connecting part is electrically connected to the electrode leads, thereby realizing the input or output of electrical energy. During the battery cell assembly process, the end cap and the second connecting parts of the two adapters are first connected together. Then, the adapters are bent, and the first connecting parts of the two adapters are welded to the two tabs. Then, the adapters are bent again, so that the end cap is fitted onto the housing. The lack of a fixing structure between the first connecting parts of the two adapters, coupled with their different hardness, leads to poor synchronicity during bending. This can cause misalignment at the first connecting parts, resulting in tension at the weld between the first connecting parts and the electrode tabs, potentially causing weld cracking. Furthermore, metal wires may form on the surface of the adapters during production. If there is no insulating material separating the first connecting parts of the two adapters, these wires can overlap, potentially causing a short circuit in the battery cell, leading to self-discharge and affecting the battery cell's capacity and reliability.

[0125] To solve this problem, an insulating element is proposed to be placed between the first connecting parts of the two adapters. The insulating element fixes the first connecting parts of the two adapters together and insulates them apart. In some battery cells, the insulating element is linear. The linear insulating element is fixed between the first connecting parts of the two adapters, but the linear insulating element is only located at the first connecting parts of the two adapters. The linear insulating element is connected to the side of the first connecting part, and the connection area is small, making it easy to separate the first connecting part from the insulating element.

[0126] To improve the connection reliability between the insulating component and the first connecting part, the width of the straight section can be increased so that the straight insulating component can cover the surface of the first connecting part and connect with the surface of the first connecting part, thus increasing the connection area between the insulating component and the first connecting part. However, due to the limitation of the welding area between the first connecting part and the tab, the increased width of the straight insulating component is limited, which may still result in low connection reliability between the insulating component and the first connecting part.

[0127] Based on this, this application proposes a technical solution that utilizes a first insulating portion of an insulating member located in a first gap, i.e., the first insulating portion is located between the first connecting portions of the two adapters, insulatingly separating the first connecting portions of the two adapters. A second insulating portion of the insulating member is connected to the surface of the first connecting portion, increasing the connection area between the insulating member and the first connecting portion, which is beneficial to improving the connection reliability of the first connecting portions of the two adapters. Furthermore, the second insulating portion has a clearance area, which can avoid the solder marks of the first connecting portion and the electrode tab, allowing for a larger connection area between the insulating member and the first connecting portion, improving the connection reliability between the insulating member and the first connecting portion, improving the connection reliability of the first connecting portions of the two adapters, and improving the reliability of the battery cell. Additionally, the first connecting portion and the electrode tab can also have a larger welding area, which is beneficial to improving the overcurrent capacity between the electrode tab and the first connecting portion, and improving the fast-charging performance of the battery cell.

[0128] 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. The battery cell can be a cylindrical battery cell. For example, the battery cell is a cylindrical battery cell.

[0129] 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.

[0130] The outer casing 110 may be a hollow structure, with an internal space for accommodating the electrode assembly 120 and the electrolyte. Exemplarily, the battery cell 100 is a cylindrical battery cell, and the outer casing 110 of the battery cell 100 is a cylindrical outer casing.

[0131] 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 110 may also be a non-metallic housing, such as a plastic housing (e.g., polypropylene).

[0132] 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;

[0133] The housing 111 is a component used to fit the end cap 112 to form an internal cavity of the battery cell 100, which can be used to accommodate the electrode assembly 120, electrolyte, and other components.

[0134] 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.

[0135] The casing 111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0136] 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.

[0137] The end cap 112 is connected to the housing 111 by welding, bonding, snap-fitting or other means.

[0138] 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.

[0139] 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 tab 122 of electrode assembly 120 may extend outside housing 110.

[0140] Alternatively, the electrode assembly 120 may be entirely housed within the housing 110.

[0141] 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.

[0142] 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.

[0143] As an example, the positive electrode sheet includes a positive electrode body and a positive electrode tab. The positive electrode body includes a positive electrode active material layer and a portion of the positive electrode current collector covered by the positive electrode active material layer. The positive electrode tab includes a portion of the positive electrode current collector not covered by the positive electrode active material layer.

[0144] 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.

[0145] 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.).

[0146] 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 manganese iron phosphate, and lithium manganese iron 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 0.1O2 (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.

[0147] 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.

[0148] As an example, the negative electrode sheet includes a negative electrode body and a negative electrode tab. The negative electrode body includes a negative electrode active material layer and a portion of the negative electrode current collector covered by the negative electrode active material layer. The negative electrode tab includes a portion of the negative electrode current collector not covered by the negative electrode active material layer.

[0149] 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.

[0150] 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.).

[0151] 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.

[0152] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] In some embodiments, the battery cell 100 further includes an electrolyte, which 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, or solid.

[0157] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0163] 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.

[0164] 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.

[0165] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0166] In some embodiments, the positive electrode, negative electrode, and separator are wound together.

[0167] 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.

[0168] Referring to Figures 2-6, in some embodiments, a battery cell 100 is provided. The battery cell 100 includes a housing 110, an electrode assembly 120, and an adapter assembly 130. The housing 110 has two electrode leads 110a. At least a portion of the electrode assembly 120 is located within the housing 110. The electrode assembly 120 includes a main body 121 and two tabs 122 of different polarities. The two tabs 122 extend from the same end of the main body 121. The adapter assembly 130 includes an insulating member 131 and two spaced-apart adapters 132. Each adapter 132 includes a first connecting portion 1321 and a second connecting portion 1322 connected together. The second connecting portions 1322 of the two adapters 132 are electrically connected to the two electrode leads 110a respectively. The connecting portions 1321 are spaced apart along a first direction to form a first gap 131a. The first direction is perpendicular to the second direction, which is the axial direction of the main body 121. The first connecting portions 1321 of the two adapters 132 are respectively welded to the two tabs 122 to form two solder marks 1321a. The insulating member 131 includes a first insulating portion 1311 and a second insulating portion 1312 connected to each other. The first insulating portion 1311 is located in the first gap 131a. The first connecting portion 1321 has a first surface 1321b and a second surface 1321c arranged opposite to each other along the second direction. At least one of the first surface 1321b and the second surface 1321c is covered by the second insulating portion 1312. The second insulating portion 1312 is provided with a clearance area 1312b for avoiding the corresponding solder mark 1321a.

[0169] In some examples, a positive electrode body portion, a negative electrode body portion, and an insulating member constitute a body portion 121, and two tabs 122 of different polarities are led out from the same end of the body portion 121; one of the two tabs 122 is a positive tab and the other is a negative tab.

[0170] The two electrode leads 110a are insulated from each other. The two electrode leads 110a are 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 two electrode leads 110a are used to connect to a busbar.

[0171] As an example, the electrode lead-out portion 110a can be an electrode terminal disposed on the housing 110, which 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.

[0172] As an example, the electrode lead-out portion 110a may also be part of the housing 110. For example, the electrode lead-out portion 110a may be the end cap 112 of the housing 110, or the electrode lead-out portion 110a may be the end wall of the housing 111 opposite to the end cap 112.

[0173] The adapter assembly 130 is a component used to electrically connect two electrode leads 110a and two tabs 122. The adapter assembly 130 includes two adapters 132, one adapter 132 connecting one tab 122 to one electrode lead 110a, and the other adapter 132 connecting the other tab 122 to the other electrode lead 110a, thereby realizing that the two tabs 122 are electrically connected to the two electrode leads 110a respectively, and realizing the charging and discharging of the battery cell 100.

[0174] The two adapters 132 are spaced apart, ensuring they are not connected and thus achieving insulation, reducing the risk of short circuits in the battery cell 100. The adapters 132 can be made of materials such as copper or aluminum.

[0175] The adapter 132 includes two parts, one part being a first connecting part 1321 and the other part being a second connecting part 1322. The first connecting part 1321 is welded to the tab 122 to form a solder mark 1321a, and the second connecting part 1322 is connected to the electrode lead-out part 110a.

[0176] The second connecting part 1322 and the electrode lead-out part 110a can be connected by riveting, welding or other methods.

[0177] During the assembly of the battery cell 100, the second connecting portion 1322 can be bent relative to the first connecting portion 1321, so that the adapter 132 forms a multi-layer structure. The dividing line between the first connecting portion 1321 and the second connecting portion 1322 can be referred to as the dashed line M in Figure 2.

[0178] As an example, the second connecting part 1322 is bent at the same position relative to the first connecting part 1321, so that the adapter 132 has a double-layer structure. The space occupied by the adapter 132 helps to reduce space waste, improve the structural compactness of the battery cell 100, and improve the energy density of the battery cell 100. For example, the adapter 132 is U-shaped or similar to U-shaped.

[0179] As an example, the second connecting part 1322 is bent at two locations relative to the first connecting part 1321, so that the adapter 132 has a three-layer structure. For example, the adapter 132 is Z-shaped or similar to Z-shaped.

[0180] The first connecting portions 1321 of the two adapters 132 are spaced apart to reduce the risk of short circuits. The direction of the spaced arrangement of the first connecting portions 1321 of the two adapters 132 is a first direction. The gap formed by the spaced arrangement of the first connecting portions 1321 of the two adapters 132 is a first gap 131a. The first gap 131a can refer to the gap formed by the sides of the first connecting portions 1321 of the two adapters 132 facing each other.

[0181] As an example, the main body 121 is cylindrical. The second direction can refer to the axial direction of the main body 121, the height direction of the main body 121, or the thickness direction of the first connecting part 1321, as shown in the Z direction in Figure 2. The first direction can refer to a direction perpendicular to or nearly perpendicular to the second direction. For example, the first direction can refer to the radial direction of the main body 121, and this radial direction is parallel to the arrangement direction of the two tabs 122, as shown in the X direction in Figure 2.

[0182] In some examples, the first connecting portion 1321 may cover the tab 122 and be welded to the tab 122 to form a solder mark 1321a, or the tab 122 may cover the first connecting portion 1321 and be welded to the tab 122 to form a solder mark 1321a.

[0183] One of the adapters 132 has its first connecting portion 1321 welded to one of the tabs 122 to form a solder mark 1321a, and the first connecting portion 1321 of the other adapter 132 is also welded to the other tab 122 to form a solder mark 1321a.

[0184] The first connecting portion 1321 has two surfaces disposed opposite to each other along a second direction, one of which is a first surface 1321b and the other is a second surface 1321c, the first surface 1321b and the second surface 1321c being distributed opposite to each other along the second direction.

[0185] Insulating component 131 can refer to an insulating component used to insulate and separate the first connecting portions 1321 of the two adapters 132 and connect the first connecting portions 1321 of the two adapters 132 together. The insulating component 131 is a component made of insulating material, such as polypropylene (PP), polyphenylene sulfide (PPS), polyimide (PI), polyethylene (PE), silicon carbide (SiC), ceramics, etc.

[0186] The insulating component 131 and the first connecting portion 1321 of the two adapters 132 can be an integral structure, such as integral injection molding; the insulating component 131 and the first connecting portion 1321 of the two adapters 132 can also be molded separately and then fixed together by screwing, snapping, bonding or other methods.

[0187] In some examples, the first insulating portion 1311 may refer to the part of the insulating member 131 located within the first gap 131a, that is, the part located between the first connecting portions 1321 of the two adapters 132. The insulating member 131 may cover the first surface 1321b and / or the second surface 1321c, wherein the portion of the insulating member 131 covering the first surface 1321b may be referred to as the second insulating portion 1312, and the portion of the insulating member 131 covering the second surface 1321c may also be referred to as the second insulating portion 1312. The first insulating portion 1311 and the second insulating portion 1312 may be an integral structure, for example, integral injection molding, 3D printing, etc.; the first insulating portion 1311 and the second insulating portion 1312 may also be molded separately and then fixed together by screwing, snap-fitting, bonding, etc.

[0188] As an example, the first insulating part 1311 and the second insulating part 1312 are separated by the side of the first connecting part 1321 facing the first connecting part 1321 of the other adapter 132, as shown by the dashed line N in Figure 5.

[0189] As an example, the number of second insulating portions 1312 may refer to two. The two second insulating portions 1312 may cover the first surface 1321b of the first connecting portion 1321 of the two adapters 132, or the two second insulating portions 1312 may cover the second surface 1321c of the first connecting portion 1321 of the two adapters 132.

[0190] As an example, the number of second insulating portions 1312 can be four, and the first surface 1321b and the second surface 1321c of the first connecting portion 1321 of the two adapters 132 are covered with the second insulating portions 1312.

[0191] As an example, the second insulating portion 1312 has a clearance area 1312b, which is used to avoid the corresponding solder mark 1321a. Here, "the second insulating portion 1312 and the corresponding solder mark 1321a" can refer to the second insulating portion 1312 and the solder mark 1321a located on the same side of the first insulating portion 1311. The clearance area 1312b penetrates the two surfaces of the second insulating portion 1312 that are distributed opposite to each other along the second direction, thereby forming a hollow area to avoid the solder mark 1321a. Viewed from the second direction, the solder mark 1321a does not coincide with the second insulating portion 1312, and the solder mark 1321a is located within the clearance area 1312b. The shape of the clearance area 1312b can be various, such as trapezoidal, circular, etc.

[0192] In this embodiment of the battery cell 100, the first insulating portion 1311 of the insulating member 131 is located in the first gap 131a, that is, the first insulating portion 1311 is located between the first connecting portions 1321 of the two adapters 132. This can insulate and separate the first connecting portions 1321 of the two adapters 132, reducing the risk of short circuit between the two adapters 132 and improving the capacity utilization of the battery cell 100. In addition, the second insulating portion 1312 of the insulating member 131 can cover the first surface 1321b and / or the second surface 1321c of the first connecting portion 1321. At the same time, the second insulating portion 1312 has a clearance area 1312b to avoid the solder mark 1321a. The design of the clearance area 1312b can reduce the welding between the first connecting portion 1321 and the tab 122. The restriction of the area on the second insulating part 1312 allows for a larger connection area between the second insulating part 1312 and the first connecting part 1321. This effectively improves the connection reliability between the insulating part 131 and the first connecting part 1321, enhances the connection reliability of the first connecting parts 1321 of the two adapters 132, improves the synchronous bending capability of the two adapters 132, reduces the tensile force between the adapters 132 and the tabs 122, and improves the welding reliability between the adapters 132 and the tabs 122, thus improving the reliability of the battery cell 100. It also allows for a larger welding area between the first connecting part 1321 and the tabs 122, improving the current carrying capacity of the first connecting part 1321 and the tabs 122, and enhancing the fast-charging performance of the battery cell 100. This design simultaneously ensures the connection stability between the first connecting parts 1321 of the two adapters 132 and the fast-charging performance of the battery cell 100.

[0193] For ease of explanation, the second insulating part 1312 located on the left side in Figure 5 is used as an example. The second insulating part 1312 located on the right side may have the same structure as the second insulating part 1312 located on the left side, or it may be different.

[0194] In some embodiments, along the first direction, the maximum dimension of the second insulating portion 1312 is W1, and the distance between the corresponding solder mark 1321a and the first gap 131a is S, wherein W1≥S.

[0195] In some examples, along the first direction, the maximum dimension W1 of the second insulating portion 1312 may refer to the maximum width of the second insulating portion 1312. For example, it may refer to the distance between the side of the second insulating portion 1312 furthest from the first insulating portion 1311 and the side of the corresponding first connecting portion 1321 facing the other first connecting portion 1321.

[0196] In some examples, the distance S between the corresponding solder mark 1321a and the first gap 131a can refer to the distance between the edge of the solder mark 1321a toward the first gap 131a and the side of the corresponding first connection 1321 toward the other first connection 1321.

[0197] With the design W1≥S, it can be understood that, compared to the edge of the solder mark 1321a facing the first gap 131a, the distance between the side of the second insulating part 1312 facing away from the first insulating part 1311 and the first gap 131a is greater, so that the second insulating part 1312 can protrude from the edge of the solder mark 1321a facing the first gap 131a.

[0198] By adopting the technical solution of this embodiment, the second insulating part 1312 can protrude from the edge of the solder mark 1321a toward the first gap 131a, and the second insulating part 1312 can cover the area of ​​the first connecting part 1321 located on the side of the solder mark 1321a near or away from the second connecting part 1322, thereby effectively increasing the connection area between the first connecting part 1321 and the second insulating part 1312 and improving the connection reliability between the insulating part 131 and the adapter 132.

[0199] In some embodiments, the second insulating portion 1312 has a relief groove 1312a for avoiding the corresponding solder mark 1321a, and the relief groove 1312a forms a relief area 1312b.

[0200] It is understood that the clearance groove 1312a penetrates the side of the second insulating part 1312 facing away from the first insulating part 1311, and the clearance groove 1312a forms an opening on the side of the second insulating part 1312 facing away from the first insulating part 1311.

[0201] By adopting the technical solution of this embodiment, the material of the second insulating part 1312 can be saved, the manufacturing cost can be reduced, and more welding area can be reserved for the first connecting part 1321, which is conducive to improving the overcurrent capacity between the first connecting part 1321 and the tab 122 and improving the fast charging performance of the battery cell 100.

[0202] In some embodiments, along the direction from the first insulating portion 1311 to the corresponding solder mark 1321a, the distance between the two groove sidewalls 1312a1 of the clearance groove 1312a distributed opposite each other along the third direction increases, and the third direction is perpendicular to the first direction and the second direction.

[0203] The direction along the first insulating part 1311 pointing to the corresponding solder mark 1321a can be seen in the negative X direction in Figure 5.

[0204] The third direction can refer to the radial direction of the main body 121, which is perpendicular to the second direction, or the length direction of the first connecting part 1321, as shown in the Y direction in Figure 5.

[0205] Along the direction from the first insulating part 1311 to the corresponding solder mark 1321a, the width of the clearance groove 1312a increases, the clearance groove 1312a has a gradually expanding structure, and the width of the clearance groove 1312a increases in a step-like manner, or it can increase slowly.

[0206] By adopting the technical solution of this embodiment, more welding area can be reserved for the first connecting part 1321 and the tab 122, which is beneficial to increase the welding area of ​​the first connecting part 1321 and the tab 122, improve the overcurrent capacity of the first connecting part 1321 and the tab 122, and improve the fast charging capability of the battery cell 100. At the same time, the first connecting part 1321 and the second insulating part 1312 also have a large connection area, which effectively improves the connection reliability of the insulating part 131 and the adapter 132.

[0207] In some embodiments, the two sidewalls 1312a1 of the clearance groove 1312a are arranged at an angle to each other along a third direction.

[0208] In some examples, the two groove sidewalls 1312a1 of the clearance groove 1312a, which are distributed opposite each other along a third direction, can be planes or similar to planes. These two groove sidewalls 1312a1 can directly intersect to form an included angle, thereby forming the clearance groove 1312a; or, the two groove sidewalls 1312a1 do not directly intersect, but can intersect through their extension lines to form an included angle. These two groove sidewalls 1312a1 intersect with the bottom surface 1312a2 of the hole of the clearance groove 1312a, respectively, thereby forming the clearance groove 1312a.

[0209] As an example, referring to Figure 5, the two sidewalls 1312a1 of the clearance groove 1312a are distributed relatively in the third direction. One sidewall 1312a1 can be set horizontally and the other sidewall 1312a1 can be set at an angle. Alternatively, both sidewalls 1312a1 can be set at an angle. As an example, the two sidewalls 1312a1 are symmetrically set, which is simple in structure.

[0210] In some examples, referring to Figure 5, the first insulating part 1311 is covered by the second insulating part 1312 on both sides. Viewed from the second direction, the insulating part 131 may be in the shape of an I-beam or similar to an I-beam, so that the second insulating part 1312 and the first connecting part 1321 also have a large connection area, which is beneficial to improving the connection stability between the first connecting parts 1321 of the two adapters 132.

[0211] By adopting the technical solution of this embodiment, the clearance groove 1312a can better avoid the corresponding solder mark 1321a, so that there is a larger welding area between the first connecting part 1321 and the electrode 122, which improves the current carrying capacity between the first connecting part 1321 and the electrode 122, and can also save the material of the insulating part 131 and reduce the manufacturing cost; in addition, the clearance groove 1312a has a simple structure and is easy to process and manufacture.

[0212] In some embodiments, the angle between the two groove sidewalls 1312a1 that are relatively distributed along a third direction of the clearance groove 1312a is α, wherein the range is 0°<α≤160°.

[0213] The value of α can be 160° or any value between 0° and 160°. For example, the value of α can be, but is not limited to, 0.1°, 20°, 40°, 50°, 70°, 90°, 110°, 130°, 140°, 150°, and 160°.

[0214] By adopting the technical solution of this embodiment, the design of α > 0° is beneficial to reserve more welding area for the first connecting part 1321 and the tab 122, thereby increasing the welding area of ​​the first connecting part 1321 and the tab 122, improving the overcurrent capacity of the first connecting part 1321 and the tab 122, and improving the fast charging capability of the battery cell 100. The design of α ≤ 160° allows the first connecting part 1321 and the second insulating part 1312 to have a larger connection area, improving the connection reliability between the insulating part 131 and the first connecting part 1321. This design can better balance the connection reliability between the insulating part 131 and the first connecting part 1321 and the overcurrent capacity between the first connecting part 1321 and the tab 122.

[0215] In some embodiments, 70°≤α≤140°.

[0216] By adopting the technical solution of this embodiment, the connection reliability between the insulating member 131 and the first connecting part 1321 and the current-passing capacity between the first connecting part 1321 and the tab 122 can be better balanced.

[0217] In some embodiments, the two sidewalls 1312a1 of the clearance groove 1312a are arranged in parallel along a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0218] Understandably, α = 0°.

[0219] By adopting the technical solution of this embodiment, the clearance groove 1312a has a regular structure and is easy to process and manufacture.

[0220] In some embodiments, the second insulating portion 1312 includes a first insulator portion 13121, a second insulator portion 13122, and a third insulator portion 13123. The first insulator portion 13121 and the second insulator portion 13122 are located on opposite sides of the corresponding solder mark 1321a along a third direction. The third insulator portion 13123 is located between the first insulating portion 1311 and the corresponding solder mark 1321a, and is connected between the first insulator portion 13121 and the second insulator portion 13122. The sides of the first insulator portion 13121 and the second insulator portion 13122 facing each other and the side of the third insulator portion 13123 facing away from the first insulating portion 1311 together form a clearance groove 1312a, and the third direction is perpendicular to the first direction and the second direction.

[0221] In some examples, the second insulating portion 1312 can be divided into three parts along a third direction: the middle part is the third insulator portion 13123, and the two ends are the first insulator portion 13121 and the second insulator portion 13122, respectively. Along the direction from the first insulating portion 1311 to the corresponding solder mark 1321a, the first insulator portion 13121 and the second insulator portion 13122 protrude beyond the third insulator portion 13123, such that at least a portion of the solder mark 1321a is located between the first insulator portion 13121 and the second insulator portion 13123. Between 3122, the opposing sides of the first insulator portion 13121 and the second insulator portion 13122, and the side of the third insulator portion 13123 facing away from the first insulator portion 1311, together form a clearance groove 1312a; the opposing sides of the first insulator portion 13121 and the second insulator portion 13122 respectively form two groove sidewalls 1312a1 of the clearance groove 1312a, and the side of the third insulator portion 13123 facing away from the first insulator portion 1311 forms the bottom surface 1312a2 of the clearance groove 1312a. The boundary line between the first insulator portion 13121 and the third insulator portion 13123 can be seen as the dashed line G in Figure 5, and the boundary line between the second insulator portion 13122 and the third insulator portion 13123 can be seen as the dashed line Q in Figure 5.

[0222] The third insulator portion 13123 covers the first connecting portion 1321 and is located between the first insulating portion 1311 and the solder mark 1321a, so that the clearance groove 1312a is provided on the second insulating portion 1312 and does not extend to the first insulating portion 1311, which helps to increase the connection area between the second insulating portion 1312 and the first connecting portion 1321; in addition, the clearance groove 1312a does not extend to the first insulating portion 1311, so that there will be no hole between the first connecting portions 1321 of the two adapters 132, which helps to improve the insulation reliability between the first connecting portions 1321 of the two adapters 132 and improve the reliability of the battery cell 100.

[0223] By adopting the technical solution of this embodiment, the first insulator portion 13121 and the second insulator portion 13122 are distributed on both sides of the solder mark 1321a along the third direction, so that the areas of the second connecting portion 1322 at both ends along the third direction are respectively covered by the first insulator portion 13121 and the second insulator portion 13122. At the same time, the area of ​​the second connecting portion 1322 between the solder mark 1321a and the first insulating portion 1311 is also covered by the third insulator portion 13123. This can effectively increase the connection area of ​​the first connecting portion 1321 and the second insulating portion 1312, improve the connection reliability of the adapter 132 and the insulating component 131, and also provide a larger welding area for the first connecting portion 1321 and the tab 122.

[0224] In some embodiments, along the first direction, the maximum dimension of the second insulating portion 1312 is W1, and the minimum dimension of the third insulator portion 13123 is W2, wherein 0.02≤W2 / W1≤0.2.

[0225] In some examples, if the width of the first insulator portion 13121 is greater than the width of the second insulator portion 13122, the maximum dimension W1 of the second insulator portion 13122 along the first direction is the width of the first insulator portion 13121; if the width of the first insulator portion 13121 is less than the width of the second insulator portion 13122, the maximum dimension W1 of the second insulator portion 13122 along the first direction is the width of the second insulator portion 13122; if the width of the first insulator portion 13121 is equal to the width of the second insulator portion 13122, the maximum dimension W1 of the second insulator portion 13122 along the first direction is either the width of the first insulator portion 13121 or the width of the second insulator portion 13122.

[0226] In some examples, along the first direction, the minimum dimension W2 of the third insulator portion 13123 may refer to the minimum width of the second insulator portion 1312, for example, it may refer to the distance between the bottom surface 1312a2 of the clearance groove 1312a and the side of the corresponding first connecting portion 1321 facing the other first connecting portion 1321.

[0227] The value of W2 / W1 can be 0.02, 0.2, or any value between 0.02 and 0.2. For example, the value of W2 / W1 can be, but is not limited to, 0.02, 0.1, 0.13, 0.15, 0.17, and 0.2.

[0228] By adopting the technical solution of this embodiment, the design of W2 / W1≥0.02 ensures that the clearance groove 1312a does not extend to the first insulating part 1311, and that no hole appears between the first connecting parts 1321 of the two adapters 132. This is beneficial to improving the insulation reliability between the first connecting parts 1321 of the two adapters 132 and improving the reliability of the battery cell 100. The design of W2 / W1≤0.2 is beneficial to reserve more welding area between the first connecting part 1321 and the tab 122, increasing the welding area between the first connecting part 1321 and the tab 122, increasing the current carrying capacity of the first connecting part 1321 and the tab 122, and improving the fast charging capability of the battery cell 100. This design can better balance the insulation reliability between the two adapters 132 and the current carrying capacity between the first connecting part 1321 and the tab 122.

[0229] In some embodiments, 0.1 ≤ W2 / W1 ≤ 0.15. This design better balances the insulation reliability between the two adapters 132 and the current-carrying capacity between the first connection 1321 and the tab 122.

[0230] In some embodiments, the second insulating portion 1312 has a clearance hole for avoiding a corresponding solder mark, the clearance hole forming a clearance area 1312b.

[0231] In some embodiments, the clearance area 1312b does not penetrate the side of the second insulating portion 1312 facing away from the second insulating portion 1312. The second insulating portion 1312 is arranged around the solder mark 1321a and surrounds the hole structure formed therein. This hole structure is the clearance hole.

[0232] By adopting the technical solution of this embodiment, the design of the avoidance hole, with the second insulating part 1312 surrounding the solder mark 1321a, is beneficial to increase the connection area of ​​the first connecting part 1321 and the second insulating part 1312, improve the connection reliability of the adapter 132 and the insulating part 131, and also avoid the solder mark 1321a, providing a larger welding area for the first connecting part 1321 and the tab 122.

[0233] In some embodiments, the avoidance area 1312b extends to the first insulating portion 1311.

[0234] Understandably, a portion of the clearance zone 1312b is formed by the first insulating portion 1311 surrounding it.

[0235] As an example, the clearance groove 1312a penetrates the corresponding second insulating portion 1312 and extends to the first insulating portion 1311. The clearance groove 1312a divides the second insulating portion 1312 into two disconnected parts, and a portion of the clearance groove 1312a is formed by the first insulating portion 1311 surrounding it.

[0236] As an example, the clearance hole passes through the interface between the first insulating portion 1311 and the second insulating portion 1312 and extends to the first insulating portion 1311. A portion of the clearance hole is formed by the first insulating portion 1311, and another portion of the clearance hole is formed by the second insulating portion 1312.

[0237] By adopting the technical solution of this embodiment, more welding areas can be reserved for the first connecting part 1321 and the tab 122, thereby increasing the welding area of ​​the first connecting part 1321 and the tab 122, improving the overcurrent capacity of the first connecting part 1321 and the tab 122, and improving the fast charging performance of the battery cell 100. In addition, the avoidance area 1312b extends to the first insulating part 1311, which can save the material of the insulating part 131 and reduce the manufacturing cost of the insulating part 131.

[0238] In some embodiments, along the first direction, the maximum dimension of the second insulating portion 1312 is W1, wherein 1mm≤W1≤10mm.

[0239] The value of W1 can be 1mm, 10mm, or any value between 1mm and 10mm. For example, the value of W1 can be, but is not limited to, 1mm, 1.5mm, 2mm, 4mm, 6mm, 7mm, 8mm, and 10mm.

[0240] By adopting the technical solution of this embodiment, the design of W1≥1mm allows for a larger connection area between the second insulating part 1312 and the first connecting part 1321, improving the connection stability between the first connecting part 1321 and the second insulating part 1312. The design of W1≤10mm helps reduce the manufacturing cost of the second insulating part 1312 and also reduces the likelihood of interference with other components, improving the reliability of the battery cell 100. This design effectively balances the connection stability between the first connecting part 1321 and the second insulating part 1312, the manufacturing cost of the insulating part 131, and the risk of interference between the second insulating part 1312 and other components.

[0241] In some embodiments, 1.5mm ≤ W1 ≤ 8mm. This design better balances the connection stability between the first connecting part 1321 and the second insulating part 1312, the manufacturing cost of the insulating part 131, and the risk of interference between the second insulating part 1312 and other components.

[0242] In some embodiments, the width of the first gap 131a is W3, wherein 0.5mm≤W3≤10mm.

[0243] The width W3 of the first gap 131a can refer to the distance between the first connecting portions 1321 of the two adapters 132, that is, the distance between the opposite sides of the first connecting portions 1321 of the two adapters 132.

[0244] The value of W3 can be 0.5mm, 10mm, or any value between 0.5mm and 10mm. For example, the value of W3 can be, but is not limited to, 0.5mm, 1mm, 1.5mm, 2mm, 4mm, 5mm, 6mm, 7mm, 8mm, and 10mm.

[0245] By adopting the technical solution of this embodiment, the design with W3 ≥ 0.5mm allows for a larger insulation gap and a longer creepage distance between the first connecting portions 1321 of the two adapters 132, reducing the short-circuit risk of the first connecting portions 1321 of the two adapters 132 and improving the reliability of the battery cell 100. The design with W3 ≤ 10mm allows for more welding area reserved between the first connecting portions 1321 and the tabs 122, increasing the welding area of ​​the first connecting portions 1321 and the tabs 122, improving the overcurrent capacity of the first connecting portions 1321 and the tabs 122, and improving the fast-charging performance of the battery cell 100. This design can better balance the insulation effect between the first connecting portions 1321 of the two adapters 132 and the welding area between the first connecting portions 1321 and the tabs 122.

[0246] In some embodiments, the design of 2mm≤W3≤5mm can better balance the insulation effect between the first connecting portions 1321 of the two adapters 132 and the welding area between the first connecting portion 1321 and the tab 122.

[0247] In some embodiments, the side of the first connecting portion 1321 facing away from the first insulating portion 1311 includes an arcuate cylindrical surface 1321d, the diameter of which is... Along the third direction, the dimension of the insulating member 131 is L, where, The third direction is perpendicular to the first and second directions.

[0248] In some examples, the first connecting portion 1321 is semi-circular or similar to a semi-circular shape, and the side of the first connecting portion 1321 facing away from the first insulating portion 1311 is a semi-cylindrical surface or similar to a semi-cylindrical surface, which is the arc cylindrical surface 1321d; or, a portion of the material can be removed from the side of the first connecting portion 1321 facing away from the first insulating portion 1311, leaving a portion of the semi-cylindrical surface, which is the arc cylindrical surface 1321d, to better fit the shape of the main body portion 121.

[0249] In some examples, along a third direction, the dimension L of the insulator 131 can refer to the length of the insulator 131.

[0250] The value can be 0.6, 0.9, or any value between 0.6 and 0.9. For example, The value can be, but is not limited to, 0.6, 0.7, 0.8, or 0.9.

[0251] By adopting the technical solution of this embodiment The design allows the insulating component 131 and the first connecting part 1321 to have a large connection area, which improves the connection reliability between the insulating component 131 and the first connecting part 1321, and can also insulate and separate the first connecting parts 1321 of the two adapters 132, thus improving the insulation effect. The design reduces the risk of interference between the insulating component 131 and other components (e.g., the second connecting part 1322), thereby improving the reliability of the battery cell 100. This design can better balance the insulation effect between the first connecting parts 1321 of the two adapters 132, the connection reliability between the insulating component 131 and the first connecting part 1321, and the risk of interference between the insulating component 131 and other components.

[0252] In some embodiments, This design can better balance the insulation effect between the first connecting parts 1321 of the two adapters 132, the connection reliability between the insulating part 131 and the first connecting part 1321, and the risk of interference between the insulating part 131 and other components.

[0253] In some embodiments, as shown in Figures 6 to 9, a first surface 1321b is disposed away from the main body portion 121, and the first surface 1321b is covered by a second insulating portion 1312.

[0254] The first surface 1321b is disposed away from the main body 121. It can be understood that the second surface 1321c is disposed towards the main body 1321, and the second surface 1321c is located between the first surface 1321b and the main body 121.

[0255] As an example, a portion of the first surface 1321b is covered by the second insulating portion 1312, and the first connecting portion 1321 is located between the main body portion 121 and the second insulating portion 1312.

[0256] By adopting the technical solution of this embodiment, the second insulating part 1312 is connected to the first surface 1321b, which can increase the connection area between the insulating member 131 and the first connecting part 1321, and is beneficial to improving the connection reliability between the insulating member 131 and the first connecting part 1321. In addition, the first surface 1321b is covered with the second insulating part 1312, and the second insulating part 1312 is located on the side of the first connecting part 1321 away from the main body 121, which can reduce the risk of interference between the second insulating part 1312 and the main body 121 or the tab 122.

[0257] In some embodiments, the size of the second insulating portion 1312 covering the first surface 1321b along the second direction is T1, wherein 0.1mm≤T1≤1mm.

[0258] In some examples, along the second direction, the dimension T1 of the second insulating portion 1312 covering the first surface 1321b may refer to the thickness of the second insulating portion 1312 covering the first surface 1321b.

[0259] In some examples, the value of T1 can be 0.1 mm, 1 mm, or any value between 0.1 mm and 1 mm. For example, the value of T1 can be, but is not limited to, 0.1 mm, 0.15 mm, 0.2 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, and 1 mm.

[0260] By adopting the technical solution of this embodiment, the design with T1≥0.1mm allows the second insulating part 1312 to be stably connected to the first surface 1321b, improving the connection reliability between the insulating member 131 and the first connecting part 1321. Furthermore, it facilitates the processing and manufacturing of the second insulating part 1312 (e.g., injection molding). The design with T1≤1mm reduces the space occupied by the second insulating part 1312, which is beneficial for improving the space occupied by the electrode assembly 120 and increasing the energy density of the battery cell 100. This design effectively balances the connection reliability between the first connecting part 1321 and the insulating member 131, the processing and manufacturing of the insulating member 131, and the energy density of the battery cell 100.

[0261] In some embodiments, 0.2mm≤T1≤0.6mm. This design can better balance the connection reliability between the first connecting part 1321 and the insulating part 131, the processing and manufacturing of the insulating part 131, and the energy density of the battery cell 100.

[0262] In some embodiments, the first surface 1321b is disposed away from the main body portion 121, and the second surface 1321c is covered with the second insulating portion 1312.

[0263] It is understood that a portion of the second surface 1321c is covered by the second insulating portion 1312, and the second surface 1321c is connected to the second insulating portion 1312. The second insulating portion 1312 is provided between the main body portion 121 and the first connecting portion 1321.

[0264] By adopting the technical solution of this embodiment, the second insulating part 1312 is connected to the second surface 1321c, which can increase the connection area between the insulating part 131 and the first connecting part 1321, and is beneficial to improving the connection reliability between the insulating part 131 and the first connecting part 1321.

[0265] In some embodiments, the size of the second insulating portion 1312 covering the second surface 1321c along the second direction is T2, wherein 0.05mm≤T2≤1mm.

[0266] Along the second direction, the dimension T2 of the second insulating portion 1312 covering the second surface 1321c can refer to the thickness of the second insulating portion 1312 covering the second surface 1321c.

[0267] The value of T2 can be 0.05mm, 1mm, or any value between 0.05mm and 1mm. For example, the value of T2 can be, but is not limited to, 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, and 1mm.

[0268] By adopting the technical solution of this embodiment, with a T2 ≥ 0.05 mm design, the second insulating part 1312 can be stably connected to the second surface 1321c, improving the connection reliability between the insulating member 131 and the first connecting part 1321. In addition, it also facilitates the processing and manufacturing of the second insulating part 1312 (e.g., injection molding). With a T2 ≤ 1 mm design, the space occupied by the second insulating part 1312 is reduced, which is beneficial to improving the space occupied by the electrode assembly 120 and increasing the energy density of the battery cell 100. This design can better balance the connection reliability between the first connecting part 1321 and the insulating member 131, the processing and manufacturing of the insulating member 131, and the energy density of the battery cell 100.

[0269] In some embodiments, 0.1mm≤T2≤0.5mm. This design can better balance the connection reliability between the first connecting part 1321 and the insulating part 131, the processing and manufacturing of the insulating part 131, and the energy density of the battery cell 100.

[0270] In some embodiments, both the first surface 1321b and the second surface 1321c are covered with a second insulating portion 1312.

[0271] By adopting the technical solution of this embodiment, a second insulating part 1312 is provided on both sides of the first connecting part 1321. The insulating member 131 can clamp the first connecting part 1321, which can effectively improve the connection reliability of the first connecting part 1321 and the insulating member 131, and is conducive to improving the reliability of the battery cell 100.

[0272] In some embodiments, the first surface 1321b is disposed away from the main body portion 121, and along the second direction, the size of the second insulating portion 1312 covering the first surface 1321b is T1, and the size of the second insulating portion 1312 covering the second surface 1321c is T2, where T1≤T2.

[0273] By adopting the technical solution of this embodiment, the design of T1≤T2 can reduce the space occupied by the insulating component 131, which is beneficial to improving the space occupied by the electrode assembly 120 and increasing the energy density of the battery cell 100. In addition, when the tab 122 is located between the first connecting portion 1321 and the main body portion 121, the smaller T1 design can reduce the risk of interference between the tab 122 and the second insulating portion 1312 covering the second surface 1321c, facilitate the welding of the tab 122 and the first connecting portion 1321, and also help improve the welding reliability of the tab 122 and the first connecting portion 1321.

[0274] In some embodiments, 0.05 ≤ T2 / T1 ≤ 1.

[0275] The value of T2 / T1 can be 0.05, 1, or any value between 0.05 and 1. For example, the value of T2 / T1 can be, but is not limited to, 0.05, 0.1, 0.15, 0.2, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.

[0276] By adopting the technical solution of this embodiment, the design of T2 / T1≥0.05 ensures that, under a fixed T1, the second insulating part 1312 can be stably connected to the second surface 1321c, improving the connection reliability between the insulating member 131 and the first connecting part 1321. Furthermore, it facilitates the processing and manufacturing of the second insulating part 1312 (e.g., injection molding). The design of T2 / T1≤1, under a fixed T1, reduces the space occupied by the second insulating part 1312 covering the second surface 1321c, which is beneficial for improving the space occupied by the electrode assembly 120 and increasing the energy density of the battery cell 100. This design effectively balances the connection reliability between the first connecting part 1321 and the insulating member 131, the processing and manufacturing of the insulating member 131, and the energy density of the battery cell 100.

[0277] In some embodiments, 0.2 ≤ T2 / T1 ≤ 0.8. This design better balances the connection reliability between the first connection portion 1321 and the insulating member 131, the processing and fabrication of the insulating member 131, and the energy density of the battery cell 100.

[0278] In some embodiments, the insulating member 131 further includes a third insulating portion 1313. Along the third direction, the third insulating portion 1313 is located on the side of the first connecting portion 1321 away from the second connecting portion 1322. The second insulating portion 1312 covering the second surface 1321c is connected to one side of the third insulating portion 1313, and the second insulating portion 1312 covering the first surface 1321b is connected to the other side of the third insulating portion 1313. The third direction is perpendicular to the first direction and the second direction.

[0279] Along a third direction, the side of the first connecting portion 1321 away from the second connecting portion 1322 can refer to the side of the first connecting portion 1321 away from the bend of the adapter 132. A portion of the insulating member 131 can cover the side of the first connecting portion 1321 away from the bend of the adapter 132, and this portion is the third insulating portion 1313. The third insulating portion 1313 can cover a portion of the side of the first connecting portion 1321 away from the bend of the adapter 132, or it can cover the entire side of the first connecting portion 1321 away from the bend of the adapter 132. The third insulating portion 1313 connects the second insulating portion 1312 connected to the first surface 1321b and the second surface 1321c, so that the insulating member 131 can better cover the first connecting portion 1321, thereby improving the connection reliability between the insulating member 131 and the first connecting portion 1321.

[0280] In some embodiments, along a third direction, the distance between the side of the third insulating portion 1313 facing away from the second connecting portion 1322 and the side of the first connecting portion 1321 facing away from the second connecting portion 1322 is T3, wherein 0.1mm≤T3≤1mm.

[0281] In some examples, along the third direction, the side of the third insulating portion 1313 facing away from the second connecting portion 1322 can refer to the side of the third insulating portion 1313 facing away from the bend of the adapter 132.

[0282] In some examples, along a third direction, the side of the first connecting portion 1321 facing away from the second connecting portion 1322 can refer to the side of the first connecting portion 1321 facing away from the bend of the adapter 132.

[0283] As an example, the third insulating portion 1313 covers and connects to the side of the first connecting portion 1321 facing away from the second connecting portion 1322; along the third direction, the distance T3 between the side of the third insulating portion 1313 facing away from the second connecting portion 1322 and the side of the first connecting portion 1321 facing away from the second connecting portion 1322 can refer to the thickness of the third insulating portion 1313.

[0284] The value of T3 can be 0.1 mm, 1 mm, or any value between 0.1 mm and 1 mm. For example, the value of T3 can be, but is not limited to, 0.1 mm, 0.15 mm, 0.2 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, and 1 mm.

[0285] By adopting the technical solution of this embodiment, the design with T3 ≥ 0.1 mm allows the third insulating part 1313 to be stably connected to the first connecting part 1321, improving the connection reliability between the insulating part 131 and the first connecting part 1321. Furthermore, it facilitates the processing and manufacturing of the third insulating part 1313 (e.g., injection molding). The design with T3 ≤ 1 mm reduces the space occupied by the third insulating part 1313 and reduces the risk of interference between the third insulating part 1313 and other components (e.g., the housing 111), thus improving the reliability of the battery cell 100. This design effectively balances the connection reliability between the first connecting part 1321 and the insulating part 131, the processing and manufacturing of the insulating part 131, and the risk of interference between the third insulating part 1313 and other components (e.g., the housing 111).

[0286] In some embodiments, 0.2mm≤T3≤0.6mm. This design better balances the reliability of the connection between the first connecting part 1321 and the insulating part 131, the fabrication of the insulating part 131, and the risk of interference between the third insulating part 1313 and other components (e.g., housing 111).

[0287] In some embodiments, the first connecting portion 1321 is provided with a connecting hole 1321e, and the insulating member 131 includes a fourth insulating portion 1314, which is connected to the second insulating portion 1312 and passes through the connecting hole 1321e.

[0288] A portion of the insulating element 131 fills the connection hole 1321e, and this portion is the fourth insulating part 1314.

[0289] In some examples, the connection hole 1321e may refer to a through hole penetrating the first surface 1321b and the second surface 1321c. The fourth insulating portion 1314 is connected to the second insulating portion 1312 covering the first surface 1321b, or the fourth insulating portion 1314 is connected to the second insulating portion 1312 covering the second surface 1321c, or one end of the fourth insulating portion 1314 is connected to the second insulating portion 1312 covering the first surface 1321b, and the other end of the fourth insulating portion 1314 is connected to the second insulating portion 1312 covering the second surface 1321c.

[0290] In some examples, the connecting hole 1321e may also penetrate through either the first surface 1321b or the second surface 1321c, i.e., the connecting hole 1321e is a blind hole. For example, if the first surface 1321b is covered by the second insulating portion 1312, the connecting hole 1321e penetrates through the first surface 1321b, and the second insulating portion 1312 covering the first surface 1321b is connected to the fourth insulating portion 1314. If the second surface 1321c is covered by the second insulating portion 1312, the connecting hole 1321e penetrates through the second surface 1321c, and the second insulating portion 1312 covering the second surface 1321c is connected to the fourth insulating portion 1314.

[0291] In some examples, the insulating member 131 is injection molded with the first connecting portion 1321, and the insulating material can fill the connecting hole 1321e to form the fourth insulating portion 1314. In the third direction, the projection of the connecting hole 1321e is located within the projection of the second insulating portion 1312 to facilitate the connection between the second insulating portion 1312 and the fourth insulating portion 1314.

[0292] In some examples, the shape of the connection hole 1321e can be various, such as circular, polygonal, etc. The number of connection holes 1321e can be one or more.

[0293] As an example, along a third direction, two connection holes 1321e are provided at both ends of the first connection portion 1321 to improve the connection reliability between the insulating component 131 and the first connection portion 1321.

[0294] By adopting the technical solution of this embodiment, the fourth insulating part 1314 of the insulating member 131 passes through the connecting hole 1321e, which can enhance the connection reliability of the second insulating part 1312 and the first connecting part 1321 and improve the reliability of the battery cell 100.

[0295] In some embodiments, the first surface 1321b and the second surface 1321c are covered with a second insulating portion 1312, the second insulating portion 1312 covering the first surface 1321b is connected to one end of the fourth insulating portion 1314, and the second insulating portion 1312 covering the second surface 1321c is connected to the other end of the fourth insulating portion 1314.

[0296] By adopting the technical solution of this embodiment, the fourth insulating part 1314 connects the second insulating parts 1312 located on opposite sides of the first connecting part 1321, making it difficult for the fourth insulating part 1314 to come out of the connecting hole. At the same time, the first connecting part 1321 is also not easy to come out from between the two second insulating parts 1312, effectively strengthening the connection reliability between the second insulating part 1312 and the first connecting part 1321, and improving the reliability of the battery cell 100.

[0297] In some embodiments, referring to FIG10, the insulating member 131 further includes a first blocking portion 1315, a first surface 1321b covered with a second insulating portion 1312, one end of a fourth insulating portion 1314 connected to the second insulating portion 1312, and the other end of the fourth insulating portion 1314 connected to the first blocking portion 1315. The first blocking portion 1315 is used to prevent the fourth insulating portion 1314 from coming out of the connecting hole 1321e.

[0298] In some examples, the first blocking portion 1315 and the second surface 1321c are located on the same side of the first connecting portion 1321. The fourth insulating portion 1314 is connected between the first blocking portion 1315 and the second insulating portion 1312 covering the first surface 1321b. The first blocking portion 1315 cannot pass through the connecting hole 1321e, making it difficult for the fourth insulating portion 1314 to come out of the connecting portion. The second insulating portion 1312 is stably connected to the first connecting portion 1321, which enhances the connection reliability between the first connecting portion 1321 and the insulating member 131.

[0299] As an example, the diameter d of the connecting hole 1321e is smaller than the size S1 of the first blocking part 1315, so that the fourth insulating part 1314 is not easily dislodged from the connecting part.

[0300] As an example, the connecting hole 1321e is a stepped hole or a gradient hole. The minimum diameter of the connecting hole 1321e is smaller than the size S1 of the first blocking part 1315, which also makes it difficult for the fourth insulating part 1314 to come off from the connecting part.

[0301] In some examples, the first blocking portion 1315 may be located inside the connecting hole 1321e or outside the connecting hole 1321e and cover the second surface 1321c.

[0302] By adopting the technical solution of this embodiment, the size of the first blocking part 1315 can be set to be smaller, so that the fourth insulating part 1314 is not easy to come out of the connection hole 1321e. This can save materials and reduce the risk of interference between the insulating part 131 and other components (e.g., tab 122, main body 121, etc.), thereby improving the reliability of the battery cell 100.

[0303] In some embodiments, referring to FIG10, the insulating member 131 further includes a second blocking portion 1316, the second surface 1321c is covered with the second insulating portion 1312, one end of the fourth insulating portion 1314 is connected to the second insulating portion 1312, the other end of the fourth insulating portion 1314 is connected to the second blocking portion 1316, and the first blocking portion 1315 is used to prevent the fourth insulating portion 1314 from coming out of the connecting hole 1321e.

[0304] In some examples, the second blocking portion 1316 and the first surface 1321b are located on the same side of the first connecting portion 1321. The fourth insulating portion 1314 is connected between the second blocking portion 1316 and the second insulating portion 1312 covering the second surface 1321c. The second blocking portion 1316 cannot pass through the connecting hole 1321e, making it difficult for the fourth insulating portion 1314 to come out of the connecting portion. The second insulating portion 1312 is stably connected to the first connecting portion 1321, which enhances the connection reliability between the first connecting portion 1321 and the insulating member 131.

[0305] As an example, the diameter d of the connecting hole 1321e is smaller than the size S2 of the second blocking part 1316, so that the fourth insulating part 1314 is not easily dislodged from the connecting part.

[0306] As an example, the connecting hole 1321e is a stepped hole or a gradient hole. The minimum diameter of the connecting hole 1321e is smaller than the size S2 of the second blocking part 1316, which also makes it difficult for the fourth insulating part 1314 to come off from the connecting part.

[0307] In some examples, the second blocking portion 1316 may be located inside the connecting hole 1321e or outside the connecting hole 1321e and covering the first surface 1321b.

[0308] By adopting the technical solution of this embodiment, the size of the second blocking part 1316 can be set to be smaller, so that the fourth insulating part 1314 is not easy to come out of the connection hole 1321e. This can save materials and reduce the risk of interference between the insulating part 131 and other components (e.g., the second connecting part 1322, etc.), thereby improving the reliability of the battery cell 100.

[0309] In some embodiments, the diameter of the connecting hole 1321e is d, wherein 0.5mm≤d≤5mm.

[0310] The value of d can be 0.5mm, 5mm, or any value between 0.5mm and 5mm. For example, the value of d can be, but is not limited to, 0.5mm, 1mm, 1.2mm, 2mm, 3mm, 4mm, and 5mm.

[0311] By adopting the technical solution of this embodiment, the design with d≥0.5mm enables the fourth insulating part 1314 to be stably connected to the second connecting part 1322, improving the connection reliability between the insulating part 131 and the first connecting part 1321. In addition, it also facilitates the processing and manufacturing of the fourth insulating part 1314 (e.g., injection molding). The design with d≤5mm reduces the area occupied by the connecting hole 1321e on the first connecting part 1321, improves the current carrying capacity of the adapter 132, and also reduces the impact on the welding area of ​​the first connecting part 1321 and the tab 122, improving the current carrying capacity of the first connecting part 1321 and the tab 122, and improving the fast charging performance of the battery cell 100. This design can better balance the connection reliability between the first connecting part 1321 and the insulating part 131, the current carrying capacity of the adapter 132, and the welding area of ​​the first connecting part 1321 and the tab 122.

[0312] In some embodiments, 1.2mm≤d≤5mm. This design better balances the connection reliability between the first connection 1321 and the insulating member 131, the current carrying capacity of the adapter 132, and the welding area between the first connection 1321 and the tab 122.

[0313] In some embodiments, referring to Figures 7 and 9, the first connecting portion 1321 includes a first connecting sub-portion 13211 and a second connecting sub-portion 13212 connected together. The first connecting sub-portion 13211 is welded to the tab 122 to form a solder mark 1321a, and the second connecting sub-portion 13212 is covered with a second insulating portion 1312. Along the second direction, the size of the first connecting sub-portion 13211 is t1, and the size of the second connecting sub-portion 13212 is t2, wherein t1 < t2.

[0314] In some examples, the first connecting portion 1321 has a non-uniform thickness structure, wherein the thinner portion is the first connecting sub-portion 13211 and the thicker portion is the second connecting sub-portion 13212. The first connecting sub-portion 13211 is welded to the tab 122, and the second connecting sub-portion 13212 is covered by the second insulating portion 1312.

[0315] In some examples, the thickness t1 of the first connecting part 13211 can be made smaller than the thickness t2 of the second connecting part 13212 by means of thinning or machining.

[0316] In some examples, the thickness t2 of the second connecting part 13212 is set to be thicker, so that the first adapter 132 has good current carrying capacity. If the thickness of the first connecting part 13211 is also set to be thicker than that of the second connecting part 13212, for example, the thickness t1 of the first connecting part 13211 is greater than or equal to the thickness t2 of the second connecting part 13212, the welding of the first connecting part 13211 and the tab 122 requires a large welding power so that the first connecting part 13211 and the tab 122 can form a stable penetration depth. However, this may cause large residual thermal stress at the welding position. After welding, the temperature drops, and this thermal stress may cause cracking in the weld pool area.

[0317] By adopting the technical solution of this embodiment, the design of t1 < t2 can reduce the welding power when welding the first connecting part 13211 and the tab 122, reduce the residual thermal stress at the welding position of the first connecting part 13211 and the tab 122, reduce the risk of cracking in the weld pool area, and help improve the reliability of the battery cell 100. The thickness t2 of the second connecting part 13212 is relatively thick, which is also conducive to improving the current carrying capacity of the first connecting part 1321 and improving the fast charging performance of the battery cell 100. The thickness t1 of the first connecting part 13211 is small, which is conducive to reducing space occupation and improving the structural compactness of the battery cell 100.

[0318] In some embodiments, 0.1 ≤ t1 / t2 ≤ 0.9.

[0319] In some examples, the value of t1 / t2 can be 0.1, 0.9, or any value between 0.1 and 0.9.

[0320] For example, the values ​​of t1 / t2 can be, but are not limited to, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9.

[0321] By adopting the technical solution of this embodiment, the design of t1 / t2≥0.1 ensures good current-carrying capacity of the first connecting part 13211, which is beneficial to improving the fast-charging performance of the battery cell 100 and also facilitates the processing and manufacturing of the first connecting part 1321. The design of t1 / t2≤0.9 helps to reduce the welding power when welding the first connecting part 13211 and the tab 122, reduces the residual thermal stress at the solder mark 1321a, reduces the risk of welding cracking, improves the welding quality of the first connecting part 13211 and the tab 122, and helps to improve the reliability of the battery cell 100. This design can better balance the welding quality of the first connecting part 13211 and the tab 122 and the current-carrying capacity of the battery cell 100.

[0322] In some embodiments, 0.4 ≤ t1 / t2 ≤ 0.8.

[0323] By adopting the technical solution of this embodiment, the welding quality of the first connecting part 13211 and the tab 122 and the current carrying capacity of the battery cell 100 can be better balanced.

[0324] In some embodiments, 0.1mm ≤ t1 ≤ 0.7mm.

[0325] In some examples, the value of t1 can be 0.1 mm, 0.7 mm, or any value between 0.1 mm and 0.7 mm.

[0326] For example, the value of t1 can be, but is not limited to, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, and 0.7mm.

[0327] By adopting the technical solution of this embodiment, the design with t1≥0.1mm ensures good current-carrying capacity of the first connecting part 13211, which is beneficial to improving the fast-charging performance of the battery cell 100 and facilitating the processing and manufacturing of the first connecting part 1321. The design with t1≤0.7mm helps to reduce the welding power when welding the first connecting part 13211 and the tab 122, reduces the residual thermal stress at the solder mark 1321a, reduces the risk of welding cracking, improves the welding quality of the first connecting part 13211 and the tab 122, and helps to improve the reliability of the battery cell 100. This design can better balance the welding quality of the first connecting part 13211 and the tab 122 and the current-carrying capacity of the battery cell 100.

[0328] In some embodiments, 0.2mm ≤ t1 ≤ 0.5mm.

[0329] By adopting the technical solution of this embodiment, the welding quality of the first connecting part 13211 and the tab 122 and the current carrying capacity of the battery cell 100 can be better balanced.

[0330] In some embodiments, the insulating member 131 and the first connecting portion 1321 of the two adapters 132 are integrally injection molded.

[0331] By adopting the technical solution of this embodiment, the connection operation between the insulating component 131 and the adapter 132 is simple and the manufacturing cost is reduced. In addition, the connection between the insulating component 131 and the first connecting part 1321 has good reliability, which is conducive to improving the reliability of the battery cell 100.

[0332] In some embodiments, as shown in Figures 12-14, the outer casing 110 is provided with a liquid injection hole 110b, and the first insulating part 1311 is provided with a first through hole 1311a at a position corresponding to the liquid injection hole 110b.

[0333] In some examples, injection port 110b may refer to a through-hole for injecting electrolyte into housing 110.

[0334] In some examples, the first through hole 1311a may refer to a through hole penetrating the first insulating part 1311, and the first through hole 1311a is disposed opposite to the liquid injection hole 110b. The shape of the first through hole 1311a can be various, such as: circular, triangular, U-shaped, etc.

[0335] By adopting the technical solution of this embodiment, the electrolyte flows into the electrode assembly 120 in a timely manner through the injection hole 110b and the first through hole 1311a, thereby improving the wetting speed of the electrode assembly 120 and improving the performance of the battery cell 100.

[0336] In some embodiments, along a third direction, the first through hole 1311a penetrates the side of the first insulating portion 1311 away from the second connecting portion 1322, and the third direction is perpendicular to the first direction and the second direction.

[0337] The first through hole 1311a has an opening formed on the side of the first insulating part 1311 away from the bend of the adapter 132.

[0338] By adopting the technical solution of this embodiment, the area of ​​the first through hole 1311a can be increased, the resistance to electrolyte flowing into the electrode assembly 120 can be reduced, and the electrolyte can flow into the electrode assembly 120 quickly through the injection hole 110b and the first through hole 1311a, thereby improving the wetting speed of the electrode assembly 120 and improving the performance of the battery cell 100.

[0339] In some embodiments, referring to FIG1, the electrode assembly 120 has a central hole 120a, and the first insulating portion 1311 has a second through hole 1311b at a position corresponding to the central hole 120a.

[0340] In some examples, the center hole 120a may refer to a through hole left after the winding needle is removed, which extends along the axial direction of the body portion 121 and penetrates the body portion 121.

[0341] In some examples, the second through hole 1311b can refer to a through hole penetrating the first insulating part 1311, and the second through hole 1311b is disposed opposite to the central hole 120a. The shape of the second through hole 1311b can be various, such as circular, triangular, U-shaped, etc.

[0342] By adopting the technical solution of this embodiment, in the event of thermal runaway in the battery cell 100, the emissions in the battery cell 100 can be discharged in a timely manner through the central hole 120a and the second through hole 1311b, which is beneficial to improving the reliability of the battery cell 100. In addition, the electrolyte can also flow into the central hole 120a through the second through hole 1311b, which is beneficial to improving the wetting speed of the electrode assembly 120 and improving the performance of the battery cell 100.

[0343] In some embodiments, the housing 110 includes a housing 111 and an end cap 112, the electrode assembly 120 is located inside the housing 111, the end cap 112 covers the opening of the housing 111, and two electrode leads 110a are provided on the end cap 112.

[0344] By adopting the technical solution of this embodiment, the outer casing 110 adopts the structure of end cap 112 and housing 111. The structure of the outer casing 110 is simple and it is also convenient to assemble the battery cell 100. In addition, the two electrode leads 110a are provided on the end cap 112, which is also convenient to connect to the external circuit.

[0345] In some embodiments, as shown in Figures 12-14, a separator 140 is provided on the inner side of the end cap 112. The separator 140 insulatingly separates the end cap 112 from the second connecting portion 1322. The material of the separator 140 may be the same as or different from the material of the insulating member 131. An injection hole 110b is provided on the end cap 112. The separator 140 is provided with a third through hole 140a. The third through hole 140a is located between the injection hole 110b and the first through hole 1311a, so that the electrolyte can flow into the electrode assembly 120 in a timely manner through the injection hole 110b, the third through hole 140a and the first through hole 1311a.

[0346] In some embodiments, the battery cell 100 is a cylindrical battery cell or a prismatic battery cell.

[0347] In some examples, the battery cell 100 is a cylindrical battery cell, the casing 110 is cylindrical, and the electrode assembly 120 is cylindrical.

[0348] 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.

[0349] 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.

[0350] The present application will be described below with reference to some specific embodiments.

[0351] Example 1

[0352] In this embodiment, referring to Figures 1-6, the battery cell 100 is a cylindrical battery cell. The battery cell 100 includes a housing 110, an electrode assembly 120, and an adapter assembly 130. The housing 110 includes an end cap 112 and a shell 111. The end cap 112 is provided with two electrode leads 110a and a liquid injection hole 110b. The electrode assembly 120 is disposed on the shell 111, and the end cap 112 covers the opening of the shell 111.

[0353] In this embodiment, the electrode assembly 120 includes a main body 121 and two tabs 122, with the two tabs 122 extending from the end of the main body 121 near the end cap 112.

[0354] In this embodiment, the adapter assembly 130 includes two adapters 132 spaced apart. Each adapter 132 includes a first connecting portion 1321 and a second connecting portion 1322. The second connecting portions 1322 of the two adapters 132 are electrically connected to the two electrode leads 110a respectively. The first connecting portions 1321 of the two adapters 132 are stacked on the two tabs 122 and welded to the two tabs 122 respectively, forming two solder marks 1321a. The first connecting portions 1321 of the two adapters 132 are spaced apart along a first direction to form a first gap 131a. The first direction is perpendicular to the second direction, which is the axial direction of the main body 121.

[0355] In this embodiment, the adapter assembly 130 includes an insulating member 131, which includes a first insulating portion 1311 and a second insulating portion 1312 connected to each other. The first insulating portion 1311 is located in the first gap 131a. The first connecting portion 1321 has a first surface 1321b and a second surface 1321c disposed opposite to each other along a second direction. The first surface 1321b is disposed away from the main body portion 121, and both the first surface 1321b and the second surface 1321c are covered by the second insulating portion 1312. The second insulating portion 1312 is provided with a relief groove 1312a for avoiding the corresponding solder mark 1321a.

[0356] In this embodiment, the second insulating portion 1312 includes a first insulator portion 13121, a second insulator portion 13122, and a third insulator portion 13123. The first insulator portion 13121 and the second insulator portion 13122 are located on opposite sides of the corresponding solder mark 1321a along a third direction. The third insulator portion 13123 is located between the first insulating portion 1311 and the corresponding solder mark 1321a, and is connected between the first insulator portion 13121 and the second insulator portion 13122. The sides of the first insulator portion 13121 and the second insulator portion 13122 facing each other and the side of the third insulator portion 13123 facing away from the first insulating portion 1311 together form a clearance groove 1312a, and the third direction is perpendicular to the first direction and the second direction.

[0357] In this embodiment, the sides of the first insulator portion 13121 and the second insulator portion 13122 facing each other are arranged at an angle; along the direction from the first insulating portion 1311 to the corresponding solder mark 1321a, the distance between the sides of the first insulator portion 13121 and the second insulator portion 13122 facing each other increases; the third direction is perpendicular to the first direction and the second direction.

[0358] In this embodiment, the insulating component 131 and the first connecting portion 1321 of the two adapters 132 are integrally injection molded.

[0359] In this embodiment, the electrode assembly 120 has a central hole 120a, and the first insulating part 1311 has a second through hole 1311b at a position corresponding to the central hole 120a.

[0360] Example 2

[0361] The difference between this embodiment and Embodiment 1 is that, as shown in Figures 6-9, the insulating member 131 further includes a third insulating portion 1313. Along the third direction, the third insulating portion 1313 is located on the side of the first connecting portion 1321 away from the second connecting portion 1322. The second insulating portion 1312 covering the second surface 1321c is connected to one side of the third insulating portion 1313, and the second insulating portion 1312 covering the first surface 1321b is connected to the other side of the third insulating portion 1313.

[0362] In this embodiment, the first connecting portion 1321 is provided with a connecting hole 1321e, and the insulating member 131 includes a fourth insulating portion 1314, which is connected to the second insulating portion 1312 and passes through the connecting hole 1321e; the second insulating portion 1312 covering the first surface 1321b is connected to one end of the fourth insulating portion 1314, and the second insulating portion 1312 covering the second surface 1321c is connected to the other end of the fourth insulating portion 1314.

[0363] Example 3

[0364] The difference between this embodiment and embodiment two is that, as shown in FIG10, the insulating member 131 further includes a first blocking part 1315, the first surface 1321b is covered with a second insulating part 1312, one end of the fourth insulating part 1314 is connected to the second insulating part 1312, and the other end of the fourth insulating part 1314 is connected to the first blocking part 1315. The first blocking part 1315 is used to prevent the fourth insulating part 1314 from coming out of the connecting hole 1321e.

[0365] In this embodiment, the first connecting portion 1321 includes a first connecting sub-portion 13211 and a second connecting sub-portion 13212 connected together. The first connecting sub-portion 13211 is welded to the tab 122 to form a solder mark 1321a, and the second connecting sub-portion 13212 is covered with a second insulating portion 1312. Along the second direction, the size of the first connecting sub-portion 13211 is t1, and the size of the second connecting sub-portion 13212 is t2, wherein t1 < t2.

[0366] Example 4

[0367] The difference between this embodiment and embodiment three is that, as shown in FIG11, the insulating member 131 further includes a second blocking part 1316, the first surface 1321b is covered with the second insulating part 1312, one end of the fourth insulating part 1314 is connected to the second insulating part 1312, the other end of the fourth insulating part 1314 is connected to the second blocking part 1316, and the first blocking part 1315 is used to prevent the fourth insulating part 1314 from coming out of the connecting hole 1321e.

[0368] Example 5

[0369] The difference between this embodiment and embodiment one is that, as shown in Figures 12-14, the outer shell 110 is provided with a liquid injection hole 110b, and the first insulating part 1311 is provided with a first through hole 1311a at the position corresponding to the liquid injection hole 110b.

[0370] Example 6

[0371] The difference between this embodiment and embodiment five is that, as shown in Figure 4, the first through hole 1311a penetrates the side of the first insulating part 1311 away from the second connecting part 1322, and the third direction is perpendicular to the first direction and the second direction.

[0372] In some embodiments, referring to FIG15, 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 and fast charging performance, which is beneficial to improving the reliability and performance of the battery device 1100.

[0383] In some embodiments, referring to FIG16, 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 energy storage device 2000. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 2000. For example, it can control the charging and discharging current and voltage of the energy storage device 2000. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a 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 device 1100 has good reliability and performance, which improves the reliability and performance of the energy storage device 2000.

[0395] In some embodiments, referring to FIG17, 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 and performance, which improves the reliability and performance of the energy storage system 3000.

[0398] In some embodiments, referring to FIG18, 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 FIG19, 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 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 has two electrode leads; An electrode assembly, at least partially located within the housing, includes a main body and two tabs of different polarities, with the two tabs extending from the same end of the main body. The adapter assembly includes an insulating component and two spaced-apart adapters. Each adapter includes a first connecting portion and a second connecting portion connected to each other. The second connecting portions of the two adapters are electrically connected to two electrode leads, respectively. The first connecting portions of the two adapters are spaced apart along a first direction to form a first gap. The first direction is perpendicular to a second direction, which is the axial direction of the main body. The first connecting portions of the two adapters are welded to two electrode tabs, respectively, to form two solder marks. The insulating component includes a first insulating part and a second insulating part connected to each other, with the first insulating part located in the first gap; The first connecting portion has a first surface and a second surface disposed opposite to each other along the second direction, and at least one of the first surface and the second surface is covered by the second insulating portion; The second insulating portion has a clearance area for avoiding the corresponding solder mark.

2. The battery cell of claim 1, wherein: Along the first direction, the maximum size of the second insulating part is W1, and the corresponding distance between the solder mark and the first gap is S, where W1≥S.

3. The battery cell of claim 1 or 2, wherein: The second insulating portion has a clearance groove for avoiding the corresponding solder mark, the clearance groove forming the clearance area.

4. The battery cell of claim 3, wherein: Along the direction from the first insulating portion to the corresponding solder mark, the distance between the two groove sidewalls of the clearance grooves distributed opposite each other along a third direction increases, and the third direction is perpendicular to the first direction and the second direction.

5. The battery cell of claim 4, wherein: The avoidance grooves are arranged at an angle to the two groove sidewalls that are distributed opposite each other along the third direction.

6. The battery cell of claim 5, wherein: The angle between the two sidewalls of the avoidance groove that are relatively distributed along the third direction is α, wherein the range is 0°<α≤160°; optionally, 70°≤α≤140°.

7. The battery cell of claim 3, wherein: The clearance grooves are arranged parallel to each other on the two groove sidewalls that are distributed opposite each other along a third direction, and the third direction is perpendicular to the first direction and the second direction.

8. The battery cell of any one of claims 3-7, wherein: The second insulating portion includes a first insulator portion, a second insulator portion, and a third insulator portion. The first insulator portion and the second insulator portion are located on opposite sides of the corresponding solder marks distributed along a third direction. The third insulator portion is located between the first insulating portion and the corresponding solder mark, and the third insulator portion is connected between the first insulator portion and the second insulator portion. The opposing sides of the first insulator portion and the second insulator portion, as well as the side of the third insulator portion facing away from the first insulating portion, together form the clearance groove. The third direction is perpendicular to the first direction and the second direction.

9. The battery cell of claim 8, wherein: Along the first direction, the maximum size of the second insulating part is W1, and the minimum size of the third insulator part is W2, wherein 0.02≤W2 / W1≤0.2, and optionally, 0.1≤W2 / W1≤0.

15.

10. The battery cell of claim 1 or 2, wherein: The second insulating portion has a clearance hole for avoiding the corresponding solder mark, the clearance hole forming the clearance area.

11. The battery cell of any one of claims 1-7 and 10, wherein: The avoidance zone extends to the first insulation portion.

12. The battery cell of any one of claims 1-11, wherein: Along the first direction, the maximum dimension of the second insulating part is W1, wherein 1mm≤W1≤10mm, and optionally, 1.5mm≤W1≤8mm.

13. The battery cell of any one of claims 1-12, wherein: The width of the first gap is W3, wherein 0.5mm≤W3≤10mm, and optionally, 2mm≤W3≤5mm.

14. The battery cell of any one of claims 1-13, wherein: The side of the first connecting portion facing away from the first insulating portion comprises a circular-arc cylindrical surface, a diameter of the circular-arc cylindrical surface is In the third direction, the size of the insulating member is L, wherein, Optionally, The third direction is perpendicular to the first direction and the second direction.

15. The battery cell of any one of claims 1-14, wherein: The first surface is disposed away from the main body portion, and the first surface is covered by the second insulating portion.

16. The battery cell of claim 15, wherein: Along the second direction, the size of the second insulating portion covering the first surface is T1, wherein 0.1mm≤T1≤1mm, and optionally, 0.2mm≤T1≤0.6mm.

17. The battery cell of any one of claims 1-16, wherein: The first surface is disposed away from the main body portion, and the second surface is covered with the second insulating portion.

18. The battery cell of claim 17, wherein: Along the second direction, the dimension of the second insulating portion covering the second surface is T2, wherein 0.05mm≤T2≤1mm, and optionally, 0.1mm≤T2≤0.5mm.

19. The battery cell of any one of claims 1-18, wherein: Both the first surface and the second surface are covered with the second insulating portion.

20. The battery cell of claim 19, wherein: The first surface is disposed away from the main body portion. Along the second direction, the size of the second insulating portion covering the first surface is T1, and the size of the second insulating portion covering the second surface is T2, where T1≤T2.

21. The battery cell of claim 20, wherein: 0.05≤T2 / T1≤1, optionally, 0.2≤T2 / T1≤0.

8.

22. The battery cell of any one of claims 19-21, wherein: The insulating member further includes a third insulating portion. Along a third direction, the third insulating portion is located on the side of the first connecting portion away from the second connecting portion. The second insulating portion covering the second surface is connected to one side of the third insulating portion, and the second insulating portion covering the first surface is connected to the other side of the third insulating portion. The third direction is perpendicular to the first direction and the second direction.

23. The battery cell of claim 22, wherein: Along the third direction, the distance between the side of the third insulating part facing away from the second connecting part and the side of the first connecting part facing away from the second connecting part is T3, wherein 0.1mm≤T3≤1mm, and optionally, 0.2mm≤T3≤0.6mm.

24. The battery cell of any one of claims 1-23, wherein: The first connecting part is provided with a connecting hole, and the insulating part includes a fourth insulating part, which is connected to the second insulating part and passes through the connecting hole.

25. The battery cell of claim 24, wherein: The first surface and the second surface are covered with the second insulating portion. The second insulating portion covering the first surface is connected to one end of the fourth insulating portion, and the second insulating portion covering the second surface is connected to the other end of the fourth insulating portion.

26. The battery cell of claim 25, wherein: The insulating component further includes a first blocking portion, the first surface is covered with the second insulating portion, one end of the fourth insulating portion is connected to the second insulating portion, and the other end of the fourth insulating portion is connected to the first blocking portion. The first blocking portion is used to prevent the fourth insulating portion from coming out of the connecting hole. And / or, the insulating member further includes a second blocking portion, the second surface is covered with the second insulating portion, one end of the fourth insulating portion is connected to the second insulating portion, the other end of the fourth insulating portion is connected to the second blocking portion, and the first blocking portion is used to prevent the fourth insulating portion from coming out of the connecting hole.

27. The battery cell of any one of claims 24-26, wherein: The diameter of the connecting hole is d, wherein 0.5mm≤d≤5mm, and optionally 1.2mm≤d≤5mm.

28. The battery cell of any one of claims 1-27, wherein: The first connecting portion includes a first connecting sub-part and a second connecting sub-part connected to each other. The first connecting sub-part is welded to the electrode tab to form the solder mark, and the second connecting sub-part is covered by the second insulating portion. Along the second direction, the size of the first connecting sub-part is t1, and the size of the second connecting sub-part is t2, where t1 < t2.

29. The battery cell of claim 28, wherein: 0.1≤t1 / t2≤0.9; Optionally, 0.4 ≤ t1 / t2 ≤ 0.

8.

30. The battery cell of claim 28 or 29, wherein: 0.1mm≤t1≤0.7mm, optionally, 0.2mm≤t1≤0.5mm.

31. The battery cell of any one of claims 1-30, wherein: The insulating component and the first connecting portion of the two adapter components are integrally injection molded.

32. The battery cell of any one of claims 1-31, wherein: The outer casing is provided with a liquid injection hole, and the first insulating part is provided with a first through hole at the position corresponding to the liquid injection hole.

33. The battery cell of claim 32, wherein: Along a third direction, the first through hole penetrates the side of the first insulating portion away from the second connecting portion, and the third direction is perpendicular to the first direction and the second direction.

34. The battery cell of any one of claims 1-33, wherein: The electrode assembly has a central hole, and the first insulating part has a second through hole at a position corresponding to the central hole.

35. The battery cell of any one of claims 1-34, wherein: The housing includes a shell and an end cap. The electrode assembly is located inside the shell, and the end cap covers the opening of the shell. Two electrode leads are located on the end cap.

36. The battery cell of any one of claims 1-35, wherein: The battery cell is a cylindrical battery cell or a prismatic battery cell.

37. A battery device, wherein: It includes multiple battery cells according to any one of claims 1 to 36.

38. An energy storage device, wherein: It includes a plurality of battery cells according to any one of claims 1 to 36 or a plurality of battery devices according to claim 37, wherein the battery cells or the battery devices are used to store or provide electrical energy.

39. An energy storage system, wherein: It includes a power conversion device and an energy storage device as described in claim 38, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

40. An electrical device, comprising: Includes a battery cell according to any one of claims 1 to 36, a battery device according to claim 37, an energy storage device according to claim 38, or an energy storage system according to claim 39, wherein the battery cell or the battery device is used to store or provide electrical energy.

41. A charging network, wherein: It includes a charging pile and an energy storage device as described in claim 38 or an energy storage system as described in claim 39, wherein the energy storage device is used to provide electrical energy to the charging pile.

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