Battery cell and manufacturing method therefor, and related device

Abstract

The present application discloses a battery cell and a manufacturing method therefor, a battery device, an energy storage device, an energy storage system, an electric device, and a charging network. The battery cell comprises a casing, an electrode assembly, and an adapter assembly. The casing is provided with a first electrode lead-out portion. At least part of the electrode assembly is located in the casing. The electrode assembly comprises a main body portion and a first tab. The main body portion has a first end surface. The first tab is led out from the first end surface. The adapter assembly comprises a first adapter. The first adapter is connected to the first tab and the first electrode lead-out portion. The first adapter forms a double-layer structure. In this way, the space occupied by the first adapter is reduced, and the structural compactness of the battery cell is improved.

Description

Battery cell, its manufacturing method and related equipment

[0001] This application claims priority to Chinese Patent Application No. 202411433267.X, filed on October 14, 2024, entitled "Battery Cell and Method for Manufacturing Thereof and Related Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of battery technology, and particularly relates to a battery cell and its manufacturing method, a battery device, an energy storage device, an energy storage system, an electrical device, and a charging network. Background Technology

[0003] 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.

[0004] A battery consists of one or more individual cells to meet different capacity requirements; however, improving the structural compactness of individual cells is an important research direction in battery cell technology.

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

[0006] Application content

[0007] The purpose of this application is to provide a battery cell and its manufacturing method, battery device, energy storage device, energy storage system, power consumption device and charging network, which can improve the structural compactness of the battery cell.

[0008] The technical solution adopted in the embodiments of this application is:

[0009] In a first aspect, a battery cell is provided, comprising a housing, an electrode assembly, and an adapter assembly. The housing has a first electrode lead-out portion; at least a portion of the electrode assembly is located inside the housing; the electrode assembly includes a main body portion and a first tab, the main body portion having a first end face, and the first tab extending from the first end face; the adapter assembly includes a first adapter member, the first adapter member including a first connecting portion, a second connecting portion, and a first bending portion connecting the first connecting portion and the second connecting portion, the first connecting portion being connected to the first tab, and the second connecting portion being connected to the first electrode lead-out portion; the first connecting portion and the second connecting portion are stacked, the first connecting portion being located between the second connecting portion and the first end face, along a stacking direction perpendicular to the first connecting portion and the second connecting portion, and the first bending portion being located on the same side of the first connecting portion and the second connecting portion, such that the first adapter member forms a double-layer structure.

[0010] By adopting the technical solution of this embodiment, the first adapter includes a first connecting portion, a first bending portion, and a second connecting portion. The first connecting portion is connected to the first electrode tab, and the second connecting portion is connected to the first electrode lead-out portion, thereby realizing an electrical connection between the first electrode lead-out portion and the first electrode tab. The first connecting portion and the second connecting portion are stacked, with the first connecting portion located between the second connecting portion and the first end face of the electrode assembly. Along the stacking direction perpendicular to the first connecting portion and the second connecting portion, the first bending portion is located on the same side of the first connecting portion and the second connecting portion, so that the first adapter forms a double-layer structure. The double-layer structure of the first adapter can reduce the space occupied by the first adapter, reduce space waste, and is conducive to improving the structural compactness of the battery cell and improving the energy density of the battery cell.

[0011] In some embodiments, the first electrode lead-out portion is riveted to the second connecting portion.

[0012] By adopting the technical solution of this embodiment, the second connecting part of the first adapter and the first electrode lead-out part are connected by riveting, so that there are no welding defects between the first electrode lead-out part and the first adapter, reducing the risk of electrolyte leakage or external moisture entering the battery cell, which is beneficial to improving the performance and reliability of the battery cell. That is, the battery cell of this application embodiment can not only overcome the welding defects caused by penetration welding, but also reduce the space waste of the battery cell and improve the structural compactness of the battery cell.

[0013] In some embodiments, along the direction perpendicular to the first end face, the projected area of ​​the first connecting portion is S1, and the area of ​​the first end face is S2, wherein 0.3≤S1 / S2≤0.95; optionally, 0.4≤S1 / S2≤0.7.

[0014] By adopting the technical solution of this embodiment, the connection area between the first connecting part and the first tab can be set to be larger, thereby improving the connection reliability between the first tab and the first connecting part, which is beneficial to improving the reliability of the battery cell, as well as improving the overcurrent capacity of the first tab and the first connecting part, and improving the fast charging performance of the battery cell; it also allows the first connecting part to be installed in the casing, which facilitates the assembly of the battery cell.

[0015] In some embodiments, the first connecting portion includes a first connecting sub-portion and a second connecting sub-portion connected to each other. The second connecting sub-portion is connected to the first bent portion, and the first connecting sub-portion is welded to the first electrode lug. The thickness of the first connecting sub-portion is t1, and the thickness of the second connecting sub-portion is t2, wherein t1 < t2.

[0016] 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 first electrode tab, reduce the residual thermal stress at the weld mark position, 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.

[0017] In some embodiments, 0.1 ≤ t1 / t2 ≤ 0.9; alternatively, 0.4 ≤ t1 / t2 ≤ 0.8.

[0018] 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 first tab, reduces residual thermal stress at the solder joint, lowers the risk of welding cracking, improves the welding quality of the first connecting part and the first tab, and ultimately improves the reliability of the battery cell. This design can better balance the welding quality of the first connecting part and the first tab with the current-carrying capacity of the battery cell.

[0019] In some embodiments, 0.1mm ≤ t1 ≤ 0.7mm, and optionally, 0.2mm ≤ t1 ≤ 0.5mm.

[0020] 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 first tab, reduces residual thermal stress at the solder joint, lowers the risk of welding cracking, improves the welding quality of the first connecting part and the first tab, and ultimately improves the reliability of the battery cell. This design can better balance the welding quality of the first connecting part and the first tab with the current-carrying capacity of the battery cell.

[0021] In some embodiments, the surface of the first connector facing the first end face is flush with the surface of the second connector facing the first end face.

[0022] By adopting the technical solution of this embodiment, the surface of the first connecting part facing the first end face can better fit with the first electrode tab, which is beneficial to improving the welding quality of the first electrode tab and the first connecting part and improving the welding reliability. In addition, it can also reduce the risk of interference between the second connecting part and other components, which is beneficial to improving the connection reliability of the first connecting part and the first electrode tab.

[0023] In some embodiments, the surface of the first connector facing away from the first end face is provided with a first coating, the first coating including at least one of a nickel layer and a black ink layer.

[0024] By adopting the technical solution of this embodiment, the design of the nickel layer and / or black ink layer can reduce the reflection during the welding process, which is beneficial to improving the welding quality of the connection between the first connector and the first electrode tab, and improving the connection reliability of the connection between the first connector and the first electrode tab.

[0025] In some embodiments, the surface roughness Ra of the surface of the first connecting part facing away from the first end face ranges from 3.2 μm to 200 μm. Optionally, the surface roughness Ra of the surface of the first connecting part facing away from the first end face ranges from 50 μm to 110 μm.

[0026] By adopting the technical solution of this embodiment, the reflection during the welding process can be reduced, which is beneficial to improving the welding quality of the connection between the first connecting part and the first electrode ear, improving the connection reliability of the connection between the first connecting part and the first electrode ear, and taking into account the processing and manufacturing of the first connecting part.

[0027] In some embodiments, the surface of the first connecting part facing the first end face forms a thinning surface.

[0028] By adopting the technical solution of this embodiment, the thinning of the first connecting part is carried out by a thinning method, which is simple to manufacture and helps to reduce the manufacturing cost of the first adapter. In addition, the surface of the first connecting part facing the first end face is formed with a thinning surface, which can reduce the damage to the first coating and the surface of the first connecting part facing the first end face, reduce welding reflection, and help to improve the welding quality of the connection between the first connecting part and the first electrode, and improve the connection reliability of the connection between the first connecting part and the first electrode.

[0029] In some embodiments, the housing is provided with a second electrode lead-out portion, and the electrode assembly includes a second electrode tab with a polarity different from that of the first electrode tab, the second electrode tab being led out from the first end face; the adapter assembly includes a second adapter member spaced apart from the first adapter member, the second adapter member including a third connecting portion, a fourth connecting portion and a second bending portion connected between the third connecting portion and the fourth connecting portion, the third connecting portion being connected to the second electrode tab, and the fourth connecting portion being connected to the second electrode lead-out portion; the third connecting portion and the fourth connecting portion are stacked, the third connecting portion being located between the fourth connecting portion and the first end face, along a direction perpendicular to the stacking direction of the third connecting portion and the fourth connecting portion, the second bending portion being located on the same side of the third connecting portion and the fourth connecting portion, so that the second adapter member forms a double-layer structure.

[0030] By adopting the technical solution of this embodiment, the second adapter includes a third connecting portion, a second bending portion, and a fourth connecting portion. The third connecting portion is connected to the second electrode tab, and the fourth connecting portion is connected to the second electrode lead-out portion, thereby realizing the electrical connection between the second electrode lead-out portion and the second electrode tab of the electrode assembly. The third connecting portion and the fourth connecting portion are stacked, with the third connecting portion located between the fourth connecting portion and the first end face. Along the stacking direction perpendicular to the third connecting portion and the fourth connecting portion, the second bending portion is located on the same side of the third connecting portion and the fourth connecting portion, so that the second adapter forms a double-layer structure. The second adapter also adopts a double-layer structure, which can reduce the space occupied by the second adapter, reduce space waste, and help improve the structural compactness of the battery cell and the energy density of the battery cell.

[0031] In some embodiments, the third connecting portion includes a third connecting sub-portion and a fourth connecting sub-portion connected to each other, the fourth connecting sub-portion is connected to the second bending portion, the third connecting sub-portion is welded to the second electrode lug, and the thickness of the third connecting sub-portion is less than the thickness of the fourth connecting sub-portion.

[0032] By adopting the technical solution of this embodiment, the thickness of the third connecting part is less than that of the fourth connecting part, which can reduce the welding power when welding the third connecting part and the second tab, reduce the residual thermal stress at the weld mark position, reduce the risk of cracking in the weld pool area, and help improve the reliability of the battery cell. The thickness of the fourth connecting part is also beneficial to improving the current carrying capacity of the third connecting part, which is beneficial to improving the fast charging performance of the battery cell. The thickness of the third connecting part is small, which helps to reduce space occupation and improve the structural compactness of the battery cell.

[0033] In some embodiments, the surface of the third connector facing the first end face is flush with the surface of the fourth connector facing the first end face.

[0034] By adopting the technical solution of this embodiment, the surface of the third connecting part facing the first end face can better fit with the second electrode tab, which is beneficial to improving the welding quality and welding reliability of the second electrode tab and the third connecting part. In addition, it can also reduce the risk of interference between the fourth connecting part and other components, which is beneficial to improving the connection reliability of the third connecting part and the second electrode tab.

[0035] In some embodiments, the adapter assembly includes a first insulating member, the first insulating member including a first insulating portion connected between a third connecting portion and a fourth connecting portion.

[0036] By adopting the technical solution of this embodiment, the first insulating part is located between the first connecting part and the third connecting part. On the one hand, the first insulating part can insulate and separate the first connecting part and the third connecting part, which can reduce the risk of self-discharge and short circuit of the battery cell, which is conducive to the stable performance of the battery cell capacity and improves the reliability of the battery cell. On the other hand, the first insulating part can prevent welding slag and other components from falling from the gap between the first connecting part and the third connecting part into the electrode plates of the main body, reducing the risk of short circuit of the battery cell and further improving the reliability of the battery cell. In addition, the first insulating part can connect the first connecting part and the third connecting part together. On the one hand, it can reduce the damage to the first adapter and the second adapter during transportation. On the other hand, it can increase the synchronicity of the bending of the first adapter and the second adapter, reduce the pulling on the first connecting part or the third connecting part, and improve the connection reliability of the first tab and the first connecting part as well as the connection reliability of the second tab and the third connecting part.

[0037] In some embodiments, the first insulating member further includes a second insulating portion connected to the first insulating portion, a first vacant position is formed on the side of the first connecting portion facing away from the first bending portion, and the second insulating portion is located in the first vacant position; and / or, the first insulating member further includes a third insulating portion connected to the first insulating portion, a second vacant position is formed on the side of the third connecting portion facing away from the second bending portion, and the third insulating portion is located in the second vacant position.

[0038] By adopting the technical solution of this embodiment, welding slag and other components can be prevented from falling between the electrodes of the main body, reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0039] In some embodiments, the first insulating member further includes a fourth insulating portion, a first notch is provided on the side of the first connecting portion facing away from the third connecting portion, and the fourth insulating portion is located at the first notch and connected to the first connecting portion; and / or, the first insulating member further includes a fifth insulating portion, a second notch is provided on the side of the third connecting portion facing away from the first connecting portion, and the fifth insulating portion is located at the second notch and connected to the third connecting portion.

[0040] By adopting the technical solution of this embodiment, welding slag and other components can be prevented from falling between the electrodes of the main body, reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell.

[0041] In some embodiments, the first insulating member further includes a sixth insulating portion connected to the first insulating portion, and at least a portion of the surface of the first connecting portion facing away from the first end face is connected to the sixth insulating portion; and / or, at least a portion of the surface of the first connecting portion facing the first end face is connected to the sixth insulating portion.

[0042] By adopting the technical solution of this embodiment, the sixth insulating part can increase the connection area between the first insulating member and the first connecting part, thereby improving the connection reliability between the first insulating member and the first connecting part, improving the connection reliability between the first connecting part and the third connecting part, and thus improving the reliability of the battery cell.

[0043] In some embodiments, the first electrode tab is welded to the first connecting portion to form a first solder mark, and the sixth insulating portion has a first clearance groove to avoid the first solder mark.

[0044] By adopting the technical solution of this embodiment, the setting of the first clearance groove can reserve a larger welding area for the first connecting part and the first electrode tab, thereby improving the current carrying capacity of the battery cell. At the same time, the first insulating part and the first connecting part have a larger connection area, thereby improving the connection reliability of the first connecting part and the third connecting part. This design can better balance the current carrying capacity and the reliability of the battery cell.

[0045] In some embodiments, the first insulating member further includes a seventh insulating portion connected to the first insulating portion, and at least a portion of the surface of the third connecting portion facing away from the first end face is connected to the seventh insulating portion; and / or, at least a portion of the surface of the third connecting portion facing the first end face is connected to the seventh insulating portion.

[0046] By adopting the technical solution of this embodiment, the seventh insulating part can increase the connection area between the first insulating member and the third connecting part, thereby improving the connection reliability between the first insulating member and the third connecting part, and improving the connection reliability between the first connecting part and the third connecting part, which is beneficial to improving the reliability of the battery cell.

[0047] In some embodiments, the second electrode tab is welded to the third connecting portion to form a second weld mark, and the seventh insulating portion has a second clearance groove to avoid the second weld mark.

[0048] By adopting the technical solution of this embodiment, the setting of the second clearance groove can reserve a larger welding area for the third connection part and the first electrode tab, thereby improving the current carrying capacity of the battery cell. At the same time, the first insulating part and the third connection part have a larger connection area, thereby improving the connection reliability of the first connection part and the third connection part. This design can better balance the current carrying capacity and the reliability of the battery cell.

[0049] In some embodiments, along the direction perpendicular to the first end face, the projected area of ​​the first insulating member is S3, the area of ​​the first end face is S2, and 0.05≤S3 / S2≤0.7.

[0050] By adopting the technical solution of this embodiment, the design of S3 / S2≥0.05 allows the first insulating component to prevent welding slag and other components from falling between the electrodes of the main body, reducing the risk of short circuit in the battery cell and improving the reliability of the battery cell. The design of S3 / S2≤0.7 allows the connection area between the first connecting part and the third connecting part and the first and second electrodes to be larger, which is beneficial to improving the overcurrent capacity and fast charging capability of the battery cell. This design can better balance the reliability and fast charging capability of the battery cell.

[0051] In some embodiments, along the direction perpendicular to the first end face, the projected area of ​​the first insulating member, the first connecting portion, and the third connecting portion is S4, the area of ​​the first end face is S2, and 0.8≤S4 / S2≤0.95.

[0052] By adopting the technical solution of this embodiment, the design of S4 / S2≥0.8 makes most of the area of ​​the first end face covered, reducing the risk of welding slag and other components falling between the electrodes of the main body and reducing the risk of short circuit in the battery cell, which is conducive to improving the reliability of the battery cell. The design of S4 / S2≤0.95 makes it easy to install the adapter into the housing and facilitates the assembly of the battery cell.

[0053] In some embodiments, the housing has a liquid injection hole, and the first insulating part has a first through hole at a position corresponding to the liquid injection hole.

[0054] 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.

[0055] In some embodiments, the first through hole extends through the side of the first insulating portion away from the first bend.

[0056] 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.

[0057] In some embodiments, the electrode assembly has a central hole that penetrates through the first end face, and a second through hole is provided at a position corresponding to the central hole in the first insulating portion.

[0058] 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.

[0059] In some embodiments, the adapter assembly further includes a second insulating member connected between the second connecting portion and the fourth connecting portion.

[0060] By adopting the technical solution of this embodiment, the second insulating member can insulate and separate the second connecting part and the fourth connecting part, which is beneficial to improving the insulation reliability between the first adapter and the second adapter, and also beneficial to improving the reliability of the battery cell.

[0061] In some embodiments, the second electrode lead-out portion is riveted to the fourth connecting portion.

[0062] By adopting the technical solution of this embodiment, the fourth connecting part and the second electrode lead-out part are connected by riveting, so that there are no welding defects between the second electrode lead-out part and the second adapter, reducing the risk of electrolyte leakage or external moisture entering the battery cell, which is beneficial to improving the performance and reliability of the battery cell. That is, the battery cell of this application embodiment can not only overcome the welding defects caused by penetration welding, but also reduce the space waste of the battery cell and improve the structural compactness of the battery cell.

[0063] 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 a first electrode lead-out and a second electrode lead-out are disposed on the end cap.

[0064] In some embodiments, the battery cell is a cylindrical battery cell or a prismatic battery cell.

[0065] 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.

[0066] Secondly, a method for manufacturing a single battery cell is provided, including:

[0067] The second connecting part of the first adapter is connected to the first electrode lead-out part on the end cap, and the fourth connecting part of the second adapter is connected to the second electrode lead-out part on the end cap.

[0068] The first bent portion of the first adapter and the second bent portion of the second adapter are bent so that the first adapter and the second adapter form an angled structure.

[0069] The first connecting part of the first adapter is connected to the first electrode tab, and the third connecting part of the second adapter is connected to the second electrode tab; wherein, the electrode assembly is located inside the housing, and the first end face of the electrode assembly has the first electrode tab and the second electrode tab leading out;

[0070] Continue bending the first bent portion of the first adapter and the second bent portion of the second adapter so that the end cap fits onto the housing;

[0071] The first adapter and the second adapter are spaced apart. After the first adapter is bent, it consists of a first connecting part, a second connecting part, and a first bent part. The first bent part connects between the first connecting part and the second connecting part. The first connecting part connects to the first electrode tab, and the second connecting part connects to the first electrode lead-out part. The first connecting part and the second connecting part are stacked, with the first connecting part located between the second connecting part and the first end face. Along the stacking direction perpendicular to the first connecting part and the second connecting part, the first bent part is located on the same side of the first connecting part and the second connecting part, making the first adapter... The connector forms a double-layer structure; after the second connector is bent, the second connector is divided into a third connecting part, a fourth connecting part, and a second bent part. The second bent part is connected between the third connecting part and the fourth connecting part. The third connecting part is connected to the second electrode tab, and the fourth connecting part is connected to the second electrode lead-out part. The third connecting part and the fourth connecting part are stacked. The third connecting part is located between the fourth connecting part and the first end face. Along the stacking direction perpendicular to the third connecting part and the fourth connecting part, the second bent part is located on the same side of the third connecting part and the fourth connecting part, so that the second connector forms a double-layer structure.

[0072] By adopting the technical solution of this embodiment, the assembly method of the battery cell is simple and convenient for the manufacture of the battery cell. In addition, both the first adapter and the second adapter are double-layer structures, which helps to save the internal space of the battery cell, improve the structural compactness of the battery cell, and increase the energy density of the battery cell.

[0073] Thirdly, a battery device is provided, comprising a plurality of the aforementioned battery cells or a plurality of battery cells obtained using the aforementioned battery cell manufacturing method.

[0074] The battery device of this application embodiment has a compact structure of the battery cell, which is beneficial to improving the energy density of the battery cell and thus the energy density and range of the battery device.

[0075] Fourthly, an energy storage device is provided, comprising a plurality of the above-described battery cells, a plurality of battery cells obtained by the above-described battery cell manufacturing method, or a plurality of the above-described battery devices, wherein the battery cells or battery devices are used to store or provide electrical energy.

[0076] The energy storage device of this application embodiment has good energy density of battery cells and battery device, which is beneficial to improving the energy density and range of the energy storage device.

[0077] Fifthly, 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.

[0078] The energy storage system of this application embodiment has good energy density and endurance, which is beneficial to improving the endurance of the energy storage system.

[0079] In a sixth aspect, an electrical device is provided, comprising the aforementioned battery cell, a battery cell obtained by the aforementioned battery cell manufacturing method, the aforementioned battery device, the aforementioned energy storage device, or the aforementioned energy storage system, wherein the battery cell or battery device is used to store or provide electrical energy.

[0080] The energy storage system of this application embodiment has good energy density of battery cells and battery devices, which is beneficial to improving the endurance of electrical devices.

[0081] In a seventh 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.

[0082] The energy storage system of this application embodiment has good endurance of both the energy storage device and the energy storage system, which is beneficial to improving the endurance of the charging network.

[0083] 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

[0084] 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.

[0085] Figure 1 is an exploded view of a battery cell provided in some embodiments of this application.

[0086] Figure 2 is a schematic diagram of the structure of the battery cell shown in Figure 1.

[0087] Figure 3 is a cross-sectional view along line AA in Figure 2.

[0088] Figure 4 is a magnified view of part B in Figure 3.

[0089] Figure 5 is a structural schematic diagram of the end cap and adapter assembly provided in some other embodiments of this application.

[0090] Figure 6 is a structural schematic diagram of the end cap and adapter assembly provided in some embodiments of this application.

[0091] Figure 7 is a schematic diagram of the structure of the first adapter provided in some embodiments of this application.

[0092] Figure 8 is a schematic diagram of the structure of the first adapter shown in Figure 7.

[0093] Figure 9 is a cross-sectional view along line CC in Figure 8.

[0094] Figure 10 is a structural schematic diagram of the end cap and adapter assembly provided in some embodiments of this application.

[0095] Figure 11 is a structural schematic diagram of the end cap and adapter assembly provided in some embodiments of this application.

[0096] Figure 12 is a schematic diagram of the structure of the electrode assembly, end cap and adapter assembly provided in some embodiments of this application.

[0097] Figure 13 is an exploded view of the end cap and adapter assembly shown in Figure 12.

[0098] Figure 14 is a structural schematic diagram of the end cap and adapter assembly provided in some embodiments of this application.

[0099] Figure 15 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application.

[0100] Figure 16 is a cross-sectional view along line DD in Figure 15.

[0101] Figure 17 is a magnified view of a portion of point E in Figure 16.

[0102] Figure 18 is a structural schematic diagram of the end cap and adapter assembly provided in some embodiments of this application.

[0103] Figure 19 is an exploded view of a battery device provided in some embodiments of this application.

[0104] Figure 20 is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application.

[0105] Figure 21 is a schematic diagram of the structure of an energy storage system provided in some embodiments of this application.

[0106] Figure 22 is a schematic diagram of the structure of a vehicle provided in some embodiments of this application.

[0107] Figure 23 is a schematic diagram of the structure of a charging network provided in some embodiments of this application.

[0108] In the figures, the reference numerals are as follows: 100, battery cell; 110, casing; 110a, first electrode lead-out; 110a1, second connecting hole; 110b, second electrode lead-out; 110c, electrolyte filling hole; 110d, first rivet; 110e, second rivet; 111, end cap; 112, housing; 120, electrode assembly; 121, main body; 121a, first end face; 121b, center hole; 122, first tab; 123, second tab; 130, adapter assembly; 131, first adapter; 1311, first connecting part; 13 11a, First solder mark; 13111, First connecting part; 13112, Second connecting part; 1311a1, First coating; 1311b, Thinning surface; 1311c, First empty position; 1311d, First notch; 1312, Second connecting part; 1312a, First connecting hole; 1313, First bending part; 132, Second adapter; 1321, Third connecting part; 1321a, Second solder mark; 13211, Third connecting part; 13212, Fourth connecting part; 1321a, Second empty position; 1321b, Second notch; 1322, Fourth connecting part; 1323, Second bending part; 133, First insulating member; 133a, First clearance groove; 133b, Second clearance groove; 133c, First through hole; 133d, Second through hole; 1331, First insulating part; 1332, Second insulating part; 1333, Third insulating part; 1334, Fourth insulating part; 1335, Fifth insulating part; 1336, Sixth insulating part; 1337, Seventh insulating part; 134, Second insulating member; 141, Third insulating member; 1 41a, Third through hole; 142, Fourth insulating component; 143, Fifth insulating component; 150, Sealing nail; 200, Housing; 210, First housing; 220, Second housing; 1000, Vehicle; 1100, Battery unit; 1200, Controller; 1300, Motor; 2000, Energy storage device; 2100, Cabinet; 2200, Battery cluster; 3000, Energy storage system; 3100, Power conversion equipment; 3200, Power generation equipment; 4000, Charging network; 4100, Charging pile; 4200, Connector. Detailed Implementation

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] In some battery cells, the outer casing has an electrode lead-out section. The electrode lead-out section is used to electrically connect the external circuit and the tabs on the electrode assembly to realize the charging and discharging of the battery cell. The electrode lead-out section can be electrically connected to the tabs through an adapter. The adapter can be bent. When the adapter is in the unfolded state, one end of the adapter is connected to the electrode lead-out section, and the other end of the adapter is welded to the tab. Then, the adapter is bent again and installed into the outer casing. The adapter usually needs to be bent twice to form a three-layer structure. However, the three-layer structure occupies a lot of space, which wastes space and is not conducive to improving the structural compactness of the battery cell, nor is it conducive to improving the energy density of the battery cell.

[0121] Based on this, the present application provides a technical solution in which the adapter is bent to form a two-layer structure. The two-layer structure occupies little space, saves space inside the battery cell, and is conducive to improving the structural compactness of the battery cell and improving the energy density of the battery cell.

[0122] In some embodiments, the battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc. The battery cell can be cylindrical, flat, cuboid, or other shapes. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, prismatic battery cells, and pouch battery cells. For example, the battery cell is a cylindrical battery cell.

[0123] 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.

[0124] 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.

[0125] 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).

[0126] In some embodiments, the housing 110 includes a housing 112 and an end cap 111, the housing 112 having an opening, and the end cap 111 being connected to the housing 112 and covering the opening;

[0127] The housing 112 is a component used to fit the end cap 111 to form an internal cavity of the battery cell 100, which can be used to accommodate the electrode assembly 120, electrolyte, and other components.

[0128] The housing 112 and the end cap 111 can be separate components. For example, an opening can be provided on the housing 112, and the end cap 111 can be used to close the opening to form an internal cavity of the battery cell 100.

[0129] The casing 112 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0130] The shape of the end cap 111 can be adapted to the shape of the housing 112 to fit the housing 112. The material of the end cap 111 can be the same as or different from the material of the housing 112. Optionally, the end cap 111 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 111 is not easily deformed when subjected to compression and impact, so that the battery cell 100 can have higher structural strength and improve reliability.

[0131] The end cap 111 is connected to the housing 112 by welding, bonding, snap-fitting or other means.

[0132] The housing 112 may be open at one end or open at both ends. In some examples, the housing 112 may be a structure with an opening on one side, with one end cap 111 covering the housing 112. In other examples, the housing 112 may be a structure with openings on both sides, with two end caps 111 covering the two openings of the housing 112 respectively.

[0133] Electrode assembly 120 is a component in battery cell 100 where electrochemical reactions occur. Electrode assembly 120 may be entirely housed within housing 110 or partially housed within housing 110. For example, a portion of the tabs of electrode assembly 120 may extend outside housing 110.

[0134] Alternatively, the electrode assembly 120 may be entirely housed within the housing 110.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.).

[0140] 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 0.1 O2 (also known as NCM) 811 (e.g., lithium nickel cobalt aluminum oxides, such as LiNi) 0.8 Co 0.15 Al 0.05 At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.).

[0145] 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.

[0146] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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.

[0151] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0157] 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.

[0158] 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.

[0159] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0160] In some embodiments, the positive electrode, negative electrode, and separator are wound together.

[0161] 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.

[0162] Referring to Figures 2-4, 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 a first electrode lead-out portion 110a. At least a portion of the electrode assembly 120 is located inside the housing 110. The electrode assembly 120 includes a main body portion 121 and a first tab 122. The main body portion 121 has a first end face 121a, and the first tab 122 extends from the first end face 121a. The adapter assembly 130 includes a first adapter member 131, which includes a first connecting portion 1311, a second connecting portion 1312, and a connecting... A first bending portion 1313 is located between the first connecting portion 1311 and the second connecting portion 1312. The first connecting portion 1311 is connected to the first electrode tab 122, and the second connecting portion 1312 is connected to the first electrode lead-out portion 110a. The first connecting portion 1311 and the second connecting portion 1312 are stacked. The first connecting portion 1311 is located between the second connecting portion 1312 and the first end face 121a. Along the stacking direction perpendicular to the first connecting portion 1311 and the second connecting portion 1312, the first bending portion 1313 is located on the same side of the first connecting portion 1311 and the second connecting portion 1312, so that the first adapter 131 forms a double-layer structure.

[0163] In some examples, the positive electrode body portion, the negative electrode body portion, and the insulating member constitute the body portion 121, and the end face of the body portion 121 used to lead out the first electrode tab 122 is the first end face 121a.

[0164] As an example, the first end face 121a can refer to one of the two end faces of the main body 121 that are axially opposite to each other. The axial direction of the main body 121 can also refer to the height direction of the battery cell 100, specifically the Z direction in Figures 3 and 4.

[0165] In some examples, the first tab 122 can be a positive tab or a negative tab.

[0166] As an example, the positive electrode tab and the negative electrode tab can be located at the same end of the main body 121 in the axial direction, or they can be located at opposite ends of the main body 121 in the axial direction.

[0167] In some examples, the first electrode lead-out 110a may refer to a component provided on the housing 110 for electrical connection with an external circuit. The first electrode lead-out 110a is connected to the first electrode tab 122 via the first adapter 131, which can facilitate the input or output of electrical energy.

[0168] As an example, the first electrode lead-out portion 110a may refer to 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 111 or the housing 112.

[0169] As an example, the first electrode lead-out portion 110a may also be part of the housing 110. For example, the first electrode lead-out portion 110a may be the end cap 111 of the housing 110, or the first electrode lead-out portion 110a may be the end wall of the housing 112 opposite to the end cap 111.

[0170] In some examples, adapter 130 may refer to a component for electrically connecting an electrode lead-out and a tab. A first adapter 131 is used to electrically connect a first electrode lead-out 110a and a first tab 122, and the material of the first adapter 131 may be copper or aluminum.

[0171] In some examples, the first adapter 131 is bent at one location, such that the first adapter 131 can be divided into a first connecting portion 1311, a second connecting portion 1312, and a first bent portion 1313. The portion of the first adapter 131 at the bend is the first bent portion 1313. The first bent portion 1313 connects between the first connecting portion 1311 and the second connecting portion 1312. The first connecting portion 131 and the second connecting portion 1312 are stacked to form a double-layer structure. Along the stacking direction perpendicular to the first connecting portion 1311 and the second connecting portion 1312, the first bent portion 1313 is located at the first connecting portion 131. The first adapter 131 is located on the same side as the second connecting portion 1312, allowing it to form a double-layer structure, with one layer being the first connecting portion 1311 and the other layer being the first connecting portion 1312. Along a stacking direction perpendicular to the first connecting portion 1311 and the second connecting portion 1312, the first bent portion 1313 is located on the same side of the first connecting portion 1311 and the second connecting portion 1312, preventing the first bent portion 1313 from extending between the first connecting portion 1311 and the second connecting portion 1312 to form a single layer of the first adapter 131. This results in the first adapter 131 forming a double-layer structure, rather than a triple-layer structure. The stacking direction of the first connecting portion 1311 and the second connecting portion 1312 can be referred to as the Z direction in Figures 3 and 4, and the stacking direction perpendicular to the first connecting portion 1311 and the second connecting portion 1312 can be referred to as the X direction in Figures 2-4.

[0172] As an example, the first bending portion 1313 is arc-shaped, for instance, circular arc; the first connecting portion 1311 and the second connecting portion 1312 are straight or similar to straight, making the first adapter 131 have a U-shaped structure or a similar U-shaped structure. The boundary line between the first bending portion 1313 and the first connecting portion 1311 can be seen as the dashed line M in Figure 4, and the boundary line between the first bending portion 1313 and the second connecting portion 1312 can be seen as the dashed line N in Figure 4.

[0173] In some examples, the first connecting part 1311 and the first electrode tab 122 can be connected by welding, riveting or other means, and the second connecting part 1312 and the first electrode lead-out part 110a can be connected by welding, riveting or other means.

[0174] As an example, in the manufacturing process of some battery cells 100, the first electrode lead-out portion 110a is provided on the end cap 111, the electrode assembly 120 is installed in the housing 112, the second connecting portion 1312 is first connected to the first electrode lead-out portion 110a, the first bending portion 1313 is bent so that the first connecting portion 1311 and the second connecting portion 1312 are at 90° or close to 90°, the first connecting portion 1311 is then connected to the first tab 122, and the first bending portion 1313 is bent again so that the first connecting portion 1311 and the second connecting portion 1312 are parallel or close to parallel, and then the end cap 111 is placed on the housing 112.

[0175] By adopting the technical solution of this embodiment, the first adapter 131 includes a first connecting portion 1311, a first bending portion 1313, and a second connecting portion 1312. The first connecting portion 1311 is connected to the first electrode tab 122, and the second connecting portion 1312 is connected to the first electrode lead-out portion 110a, thereby realizing an electrical connection between the first electrode lead-out portion 110a and the first electrode tab 122. The first connecting portion 1311 and the second connecting portion 1312 are stacked, with the first connecting portion 1311 located between the second connecting portion 1312 and the first electrode lead-out portion 110a. Between the first end faces 121a of the electrode assembly 120, along the stacking direction perpendicular to the first connecting portion 1311 and the second connecting portion 1312, the first bent portion 1313 is located on the same side of the first connecting portion 1311 and the second connecting portion 1312, so that the first adapter 131 forms a double-layer structure. The double-layer structure of the first adapter 131 can reduce the space occupied by the first adapter 131, reduce space waste, and help improve the structural compactness of the battery cell 100 and the energy density of the battery cell 100.

[0176] In some embodiments, the first electrode lead-out portion 110a is riveted to the second connecting portion 1312.

[0177] Riveting can refer to a connection method that uses rivets to connect two or more parts together.

[0178] As an example, the second connecting part 1312 has a first connecting hole 1312a, the first electrode lead-out part 110a has a second connecting hole 110a1, the first rivet 110d passes through the first connecting hole 1312a and the second connecting hole 110a1, and fixes the first electrode lead-out part 110a and the second connecting part 1312 together.

[0179] In the manufacturing process of some battery cells 100, after the first adapter 131 is welded to the first tab 122, the first electrode lead-out portion 110a is then welded to the first adapter 131 from the outside of the outer casing 110 through a through-welding method. The weld marks produced by this through-welding may have defects (e.g., weld cracks, pores, etc.), which may cause the weld mark defects to grow during the use of the battery cell 100 due to external vibration and impact, gas generation inside the battery cell 100, etc., leading to weld mark cracking, which in turn leads to electrolyte leakage or external moisture entering the battery cell 100, affecting the performance and reliability of the battery cell 100.

[0180] By adopting the technical solution of this embodiment, the second connecting portion 1312 of the first adapter 131 is connected to the first electrode lead-out portion 110a by riveting, so that there are no welding defects between the first electrode lead-out portion 110a and the first adapter 131, reducing the risk of electrolyte leakage or external moisture entering the battery cell 100, which is beneficial to improving the performance and reliability of the battery cell 100. That is, the battery cell 100 of this application embodiment can not only overcome the welding defects caused by penetration welding, but also reduce the space waste of the battery cell 100 and improve the structural compactness of the battery cell 100.

[0181] In some embodiments, referring to Figures 6 and 7, the projected area of ​​the first connecting portion 1311 along the direction perpendicular to the first end face 121a is S1, and the area of ​​the first end face 121a is S2, wherein 0.3≤S1 / S2≤0.95; optionally, 0.4≤S1 / S2≤0.7.

[0182] In some examples, the direction perpendicular to the first end face 121a can refer to the height direction of the main body 121 or the axial direction of the main body 121.

[0183] In some examples, the projected area S1 of the first connecting part 1311 may refer to the area of ​​the projected image of the first connecting part 1311 on the first end face 121a.

[0184] As an example, the surface of the first connecting part 1311 facing away from the first end face 121a is a plane, and the projected area S1 of the first connecting part 1311 can refer to the area of ​​the surface of the first connecting part 1311 facing away from the first end face 121a.

[0185] As an example, the surface of the first connecting part 1311 facing the first end face 121a is a plane, and the projected area S1 of the first connecting part 1311 can refer to the area of ​​the surface of the first connecting part 1311 facing the first end face 121a.

[0186] In some examples, as shown in FIG6, the first connecting portion 1311 is similar to a semi-circle. After some material is removed from the first connecting portion 1311, the shape of the first connecting portion 1311 is non-semi-circular (as shown in FIG7), thereby reducing the projected area S1 of the first connecting portion 1311.

[0187] In some examples, the area S2 of the first end face 121a may refer to the cross-sectional area of ​​the main body 121.

[0188] As an example, the main body 121 has a cylindrical or near-cylindrical structure, and S2 = πr 2 , where r can refer to the radius of the main body 121.

[0189] In some examples, the value of S1 / S2 can be 0.3, 0.95, or any value between 0.3 and 0.95.

[0190] For example, the values ​​of S1 / S2 can be, but are not limited to, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 0.95.

[0191] By adopting the technical solution of this embodiment, the design of S1 / S2≥0.3 allows the connection area between the first connecting part 1311 and the first tab 122 to be set to be larger, thereby improving the connection reliability between the first tab 122 and the first connecting part 1311. This is beneficial to improving the reliability of the battery cell 100 and also to improving the overcurrent capacity of the first tab 122 and the first connecting part 1311, thus improving the fast charging performance of the battery cell 100. The design of S1 / S2≤0.95 allows the first connecting part 1311 to be installed inside the outer casing 110, which facilitates the assembly of the battery cell 100.

[0192] In some embodiments, 0.4 ≤ S1 / S2 ≤ 0.7.

[0193] By adopting the technical solution of this embodiment, the design of S1 / S2≥0.4 allows for a larger connection area between the first connecting part 1311 and the first tab 122, improving the connection reliability between the first tab 122 and the first connecting part 1311. This is beneficial for improving the reliability of the battery cell 100 and also for improving the overcurrent capacity of the first tab 122 and the first connecting part 1311, thus improving the fast charging performance of the battery cell 100. The design of S1 / S2≤0.7 helps to eliminate the redundant part of the first connecting part 1311 and reduces the manufacturing cost of the first adapter 131.

[0194] In some embodiments, as shown in Figures 7-9, the first connecting portion 1311 includes a first connecting sub-portion 13111 and a second connecting sub-portion 13112 connected together. The second connecting sub-portion 13112 is connected to the first bending portion 1313, and the first connecting sub-portion 13111 is welded to the first electrode tab 122. The thickness of the first connecting sub-portion 13111 is t1, and the thickness of the second connecting sub-portion 13112 is t2, wherein t1 < t2.

[0195] In some examples, the first connecting portion 1311 is a non-uniform thickness structure, wherein the portion with a smaller thickness is the first connecting sub-portion 13111, and the portion with a larger thickness is the second connecting sub-portion 13112.

[0196] In some examples, the thickness t1 of the first connecting part 13111 can be made smaller than the thickness t2 of the second connecting part 13112 by means of thinning or machining.

[0197] In some examples, the thickness t2 of the second connecting part 13112 is set to be relatively thick, so that the first adapter 131 has good current carrying capacity. If the thickness of the first connecting part 13111 is also set to be relatively thick along with the thickness of the second connecting part 13112, for example, the thickness t1 of the first connecting part 13111 is greater than or equal to the thickness t2 of the second connecting part 13112, the welding of the first connecting part 13111 and the first electrode 122 requires a large welding power so that the first connecting part 13111 and the first electrode 122 can form a stable penetration depth. However, this may cause a large amount of thermal stress to remain at the solder mark position. After welding, the temperature drops, and this thermal stress may cause cracking in the weld pool area.

[0198] By adopting the technical solution of this embodiment, the design of t1 < t2 can reduce the welding power when welding the first connecting sub-part 13111 and the first tab 122, reduce the residual thermal stress at the weld mark position, reduce the risk of cracking in the weld pool area, and help improve the reliability of the battery cell 100. The thicker t2 of the second connecting sub-part 13112 is also conducive to improving the current carrying capacity of the first connecting part 1311 and improving the fast charging performance of the battery cell 100. The smaller t1 of the first connecting sub-part 13111 is conducive to reducing space occupation and improving the structural compactness of the battery cell 100.

[0199] In some embodiments, 0.1 ≤ t1 / t2 ≤ 0.9.

[0200] In some examples, the value of t1 / t2 can be 0.1, 0.9, or any value between 0.1 and 0.9.

[0201] 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.

[0202] 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 13111, 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 1311. The design of t1 / t2≤0.9 helps to reduce the welding power during the welding of the first connecting part 13111 and the first tab 122, reduces the residual thermal stress at the weld mark, reduces the risk of welding cracking, improves the welding quality of the first connecting part 13111 and the first 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 13111 and the first tab 122 and the current-carrying capacity of the battery cell 100.

[0203] In some embodiments, 0.4 ≤ t1 / t2 ≤ 0.8.

[0204] By adopting the technical solution of this embodiment, the welding quality of the first connecting part 13111 and the first tab 122 and the current carrying capacity of the battery cell 100 can be better balanced.

[0205] In some embodiments, 0.1mm ≤ t1 ≤ 0.7mm.

[0206] 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.

[0207] 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.

[0208] By adopting the technical solution of this embodiment, the design with t1≥0.1mm ensures good current-carrying capacity of the first connecting part 13111, 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 1311. The design with t1≤0.7mm helps to reduce the welding power during the welding of the first connecting part 13111 and the first tab 122, reduces the residual thermal stress at the solder joint, lowers the risk of welding cracking, and improves the welding quality of the first connecting part 13111 and the first tab 122, which is beneficial to improving the reliability of the battery cell 100. This design can better balance the welding quality of the first connecting part 13111 and the first tab 122 and the current-carrying capacity of the battery cell 100.

[0209] In some embodiments, 0.2mm ≤ t1 ≤ 0.5mm.

[0210] By adopting the technical solution of this embodiment, the welding quality of the first connecting part 13111 and the first tab 122 and the current carrying capacity of the battery cell 100 can be better balanced.

[0211] In some embodiments, the surface of the first connecting sub-part 13111 facing the first end face 121a is flush with the surface of the second connecting sub-part 13112 facing the first end face 121a.

[0212] It is understood that the surfaces of the first connecting part 13111 facing the first end face 121a and the second connecting part 13112 facing the first end face 121a are located on the same plane or approximately on the same plane, that is, the surface of the first connecting part 1311 facing the first end face 121a is a plane or close to a plane.

[0213] By adopting the technical solution of this embodiment, the surface of the first connecting part 13111 facing the first end face 121a can better fit with the first tab 122, which is beneficial to improve the welding quality of the first tab 122 and the first connecting part 13111 and improve the welding reliability. In addition, it can also reduce the risk of the second connecting part 13112 interfering with other components, which is beneficial to improve the connection reliability of the first connecting part 1311 and the first tab 122.

[0214] In the manufacturing process of some battery cells 100, the first connector 13111 is stacked on the first tab 122. The laser is shone from the surface of the first connector 13111 facing away from the first end face 121a, thereby welding the first connector 13111 and the first tab 122. In some cases, especially when the first adapter 131 is made of copper, the surface of the first connector 13111 facing away from the first end face 121a may reflect the laser, i.e., reflective phenomenon occurs, which affects the welding quality of the first connector 13111 and the first tab 122 and is not conducive to improving the connection reliability of the first connector 13111 and the first tab 122.

[0215] In some embodiments, the surface of the first connecting sub-part 13111 facing away from the first end face 121a is provided with a first coating 1311a1, the first coating 1311a1 including at least one of a nickel layer and a black ink layer.

[0216] The first coating 1311a1 can reduce the reflection of laser light on the surface of the first connector 13111.

[0217] As an example, the first coating 1311a1 is a nickel layer, that is, the surface of the first connecting part 13111 facing away from the first end face 121a is plated with a nickel layer; the nickel layer reduces reflection, improves the welding quality of the connection between the first connecting part 13111 and the first tab 122, and improves the connection reliability of the connection between the first connecting part 13111 and the first tab 122.

[0218] As an example, the first coating 1311a1 is a black ink layer, that is, the surface of the first connecting part 13111 facing away from the first end face 121a is covered with a black ink layer. The black ink layer absorbs the laser, reduces reflection, improves the welding quality of the connection between the first connecting part 13111 and the first electrode 122, and improves the connection reliability of the connection between the first connecting part 13111 and the first electrode 122.

[0219] Of course, in other examples, the surface of the first connecting part 13111 facing away from the first end face 121a may be provided with both a nickel layer and a black ink layer.

[0220] By adopting the technical solution of this embodiment, the design of the first coating 1311a1 can reduce the reflection during the welding process, which is beneficial to improving the welding quality of the connection between the first connecting part 13111 and the first electrode 122, and improving the connection reliability of the connection between the first connecting part 13111 and the first electrode 122.

[0221] In some embodiments, the surface roughness Ra of the surface of the first connecting sub-part 13111 facing away from the first end face 121a ranges from 3.2 μm to 200 μm.

[0222] Surface roughness refers to the irregularity and undulation of the microscopic morphology of an object's surface. It describes the peaks and valleys and texture characteristics of the surface at the microscopic scale. Surface roughness can be measured using specialized equipment (e.g., stylus roughness testers, optical surface roughness testers, laser surface roughness testers, etc.).

[0223] The surface roughness Ra of the surface of the first connecting part 13111 facing away from the first end face 121a is in the range of 3.2μm to 200μm. It can be understood that the surface roughness Ra of the surface of the first connecting part 13111 facing away from the first end face 121a can be 3.2mm, 200mm or any value between 3.2mm and 200mm.

[0224] For example, the surface roughness Ra of the surface of the first connecting part 13111 facing away from the first end face 121a may be, but is not limited to, 3.2 μm, 10 μm, 50 μm, 100 μm, 110 μm, 150 μm, or 200 μm.

[0225] The surface roughness Ra of the surface of the first connecting part 13111 facing away from the first end face 121a is greater than or equal to 3.2 mm, making the surface of the first connecting part 13111 facing away from the first end face 121a uneven, thereby reducing laser reflection and glare, improving the welding quality of the connection between the first connecting part 13111 and the first electrode 122, improving the connection reliability of the connection between the first connecting part 13111 and the first electrode 122, and also facilitating the processing and manufacturing of the first connecting part 13111; the surface roughness Ra of the surface of the first connecting part 13111 facing away from the first end face 121a is less than or equal to 200 μm, so that the surface of the first connecting part 13111 facing away from the first end face 121a can fit well on the first electrode 122 and weld to the first electrode 122, which can further improve the connection reliability of the first connecting part 13111 and the first electrode 122.

[0226] By adopting the technical solution of this embodiment, the reflection during the welding process can be reduced, which is beneficial to improving the welding quality of the connection between the first connecting sub-part 13111 and the first electrode 122, improving the connection reliability of the connection between the first connecting sub-part 13111 and the first electrode 122, while also taking into account the processing and manufacturing of the first connecting sub-part 13111.

[0227] In some embodiments, the surface roughness Ra of the surface of the first connecting part facing away from the first end face ranges from 50 μm to 110 μm.

[0228] By adopting the technical solution of this embodiment, the reflection during the welding process can be reduced better, which is conducive to improving the welding quality of the connection between the first connecting sub-part 13111 and the first electrode 122, improving the connection reliability of the connection between the first connecting sub-part 13111 and the first electrode 122, while also taking into account the processing and manufacturing of the first connecting sub-part 13111.

[0229] In some embodiments, as shown in FIG10, the surface of the first connecting sub-part 13111 facing the first end face 121a forms a thinning surface 1311b.

[0230] It is understandable that the first connecting part 13111 is thinned by a tapping method. The tapping method refers to using a tapping tool to tap the first connecting part 13111, so that the first connecting part 13111 is thinned. The surface of the first connecting part 13111 tapped by the tapping tool is the tapping surface 1311b, that is, the surface of the first connecting part 13111 facing the first end face 121a. In other words, the tapping tool is used to tap the surface of the first connecting part 13111 facing the first end face 121a.

[0231] As an example, the thinning surface 1311b can refer to the surface of the first connecting part 1311 that is in direct contact with the thinning tool.

[0232] Compared with machining, the thinning process using the tapping method leaves tool marks on the machined surface, while the tapped surface 1311b does not have tool marks and is relatively flat, which facilitates welding with the first tab 122 and helps improve the welding reliability between the first connecting part 13111 and the first tab 122.

[0233] By adopting the technical solution of this embodiment, the thinning of the first connecting part 13111 is carried out by a thinning method, which is simple to manufacture and helps to reduce the manufacturing cost of the first adapter 131. In addition, the surface of the first connecting part 13111 facing the first end face 121a forms a thinning surface 1311b, which can reduce the damage to the first coating 1311a1 and the surface of the first connecting part 13111 facing the first end face 121a by thinning, reduce welding reflection, and help to improve the welding quality of the connection between the first connecting part 13111 and the first electrode 122, and improve the connection reliability of the connection between the first connecting part 13111 and the first electrode 122.

[0234] In some embodiments, referring to Figures 5 and 6, the housing 110 is provided with a second electrode lead-out portion 110b, the electrode assembly 120 includes a second electrode tab 123 with a polarity different from that of the first electrode tab 122, the second electrode tab 123 being led out from the first end face 121a; the adapter assembly 130 includes a second adapter 132 spaced apart from the first adapter 131, the second adapter 132 including a third connecting portion 1321, a fourth connecting portion 1322, and a second bending portion 132 connecting the third connecting portion 1321 and the fourth connecting portion 1322. 3. The third connecting part 1321 is connected to the second electrode tab 123, and the fourth connecting part 1322 is connected to the second electrode lead-out part 110b. The third connecting part 1321 and the fourth connecting part 1322 are stacked, with the third connecting part 1321 located between the fourth connecting part 1322 and the first end face 121a. Along the stacking direction perpendicular to the third connecting part 1321 and the fourth connecting part 1322, the second bending part 1323 is located on the same side of the third connecting part 1321 and the fourth connecting part 1322, so that the second adapter 132 forms a double-layer structure.

[0235] In some examples, the second electrode lead 110b may refer to a component provided on the housing 110 for electrical connection with an external circuit. The first electrode lead 110a and the second electrode lead 110b are insulated from each other. The first electrode lead 110a and the second electrode lead 110b are used to connect the external circuit, the second tab 123 and the first tab 122, thereby forming a circuit to realize the charging and discharging of the battery cell 100.

[0236] As an example, the second electrode lead-out portion 110b can refer to various structures.

[0237] For example, when the first electrode lead-out portion 110a is an electrode terminal provided on the housing 110, the second electrode lead-out portion 110b can be an electrode terminal provided on the housing 110, or the second electrode lead-out portion 110b can be a housing 112 or an end cap 111; of course, it can also be other structures.

[0238] For example, when the first electrode lead-out portion 110a is a housing 112 or an end cap 111, the second electrode lead-out portion 110b is an electrode terminal provided on the outer casing 110.

[0239] In some examples, the first electrode 122 is the positive electrode and the second electrode 123 is the negative electrode; or, the first electrode 122 is the negative electrode and the second electrode 123 is the positive electrode.

[0240] In some examples, the first tab 122 and the second tab 123 are both led out from the first end face 121a. The first tab 122 and the second tab 123 are located at the same end of the electrode assembly 120, which facilitates the assembly and use of the battery cell 100.

[0241] In some examples, the first adapter 131 and the second adapter 132 have different polarities. The first adapter 131 and the second adapter 132 are spaced apart and do not contact each other, which reduces the risk of short circuits in the battery cell 100. The structure of the first adapter 131 and the second adapter 132 may be the same or different. For example, the first adapter 131 and the second adapter 132 may follow the configuration shown in Figures 2-4.

[0242] In some examples, the second adapter 132 is bent at one location, such that the second adapter 132 can be divided into a third connecting portion 1321, a fourth connecting portion 1322, and a second bent portion 1323. The portion of the second adapter 132 at the bend is the second bent portion 1323, which connects the third connecting portion 1321 and the fourth connecting portion 1322. The third connecting portion 1321 and the fourth connecting portion 1322 are stacked to form a double-layer structure. Along the stacking direction perpendicular to the third connecting portion 1321 and the fourth connecting portion 1322, the second bent portion 1323 is located at the third connecting portion 1321. The second adapter 132 is located on the same side as the third connecting portion 1321 and the fourth connecting portion 1322, allowing it to form a double-layer structure, with one layer being the third connecting portion 1321 and the other layer being the third connecting portion 1321. Along the stacking direction perpendicular to the third connecting portion 1321 and the fourth connecting portion 1322, the second bending portion 1323 is located on the same side of the third connecting portion 1321 and the fourth connecting portion 1322, preventing the second bending portion 1323 from extending between the third connecting portion 1321 and the fourth connecting portion 1322 to form a single layer of the second adapter 132. This results in the second adapter 132 forming a double-layer structure, rather than a triple-layer structure. The stacking direction of the third connecting portion 1321 and the fourth connecting portion 1322 can be seen in the Z direction in Figures 3 and 4, and the stacking direction perpendicular to the third connecting portion 1321 and the fourth connecting portion 1322 can be seen in the X direction in Figures 2-4.

[0243] As an example, the second bending portion 1323 is arc-shaped, for example, in the form of a circular arc; the third connecting portion 1321 and the fourth connecting portion 1322 are straight or similar to straight, so that the second adapter 132 has a U-shaped structure or similar to a U-shaped structure.

[0244] In some examples, the third connecting part 1321 and the second electrode tab 123 can be connected by welding, riveting or other means, and the fourth connecting part 1322 and the second electrode lead-out part 110b can be connected by welding, riveting or other means.

[0245] As an example, in the manufacturing process of some battery cells 100, a first electrode lead-out portion 110a and a second electrode lead-out portion 110b are provided on an end cap 111. The electrode assembly 120 is installed into the housing 112. First, the second connecting portion 1312 of the first adapter 131 and the fourth connecting portion 1322 of the second adapter 132 are connected to the first electrode lead-out portion 110a and the second electrode lead-out portion 110b respectively. Then, the first bent portion 1313 and the second bent portion 1323 are bent, so that the first adapter 131 and the second adapter 132b are connected. The first connecting part 1311 and the second connecting part 1321 are bent at a 90° angle or close to 90°, and then connected to the first tab 122 and the second tab 123 respectively. Then, the first bent part 1313 and the second bent part 1323 are bent further, making the first connecting part 1311 and the second connecting part 1312 parallel or nearly parallel, and the third connecting part 1321 and the fourth connecting part 1322 parallel or nearly parallel. Finally, the end cap 111 is placed over the opening of the housing 112, thus completing the assembly of the battery cell 100. The first bend of the first bent part 1313 and the second bent part 1323 makes the first adapter 131 and the second adapter 132 at a 90° angle or close to 90°, so that the end cap 111 is vertically positioned on the side of the housing 112, reducing the risk of interference between the periphery of the end cap 111 and the housing 112, and facilitating subsequent assembly.

[0246] By adopting the technical solution of this embodiment, the second adapter 132 includes a third connecting portion 1321, a second bending portion 1323, and a fourth connecting portion 1322. The third connecting portion 1321 is connected to the second electrode tab 123, and the fourth connecting portion 1322 is connected to the second electrode lead-out portion 110b, thereby realizing an electrical connection between the second electrode lead-out portion 110b and the second electrode tab 123 of the electrode assembly 120. The third connecting portion 1321 and the fourth connecting portion 1322 are stacked, with the third connecting portion 1321 located at the fourth connecting portion 1322. Between part 1322 and the first end face 121a, along the stacking direction perpendicular to the third connecting part 1321 and the fourth connecting part 1322, the second bent part 1323 is located on the same side of the third connecting part 1321 and the fourth connecting part 1322, so that the second adapter 132 forms a double-layer structure; the second adapter 132 also adopts a double-layer structure, which can reduce the space occupied by the second adapter 132, reduce space waste, and help improve the structural compactness of the battery cell 100 and the energy density of the battery cell 100.

[0247] In some embodiments, the third connecting portion 1321 includes a third connecting sub-portion 13211 and a fourth connecting sub-portion 13212 connected together. The fourth connecting sub-portion 13212 is connected to the second bending portion 1323, and the third connecting sub-portion 13211 is welded to the second tab 123. The thickness of the third connecting sub-portion 13211 is less than the thickness of the fourth connecting sub-portion 13212.

[0248] In some examples, the third connecting portion 1321 is a non-uniform thickness structure, wherein the part with a smaller thickness is the third connecting sub-portion 13211, and the part with a larger thickness is the fourth connecting sub-portion 13212.

[0249] In some examples, the thickness of the third connecting part 13211 can be made smaller than the thickness of the fourth connecting part 13212 by means of thinning or machining.

[0250] By adopting the technical solution of this embodiment, the thickness of the third connecting sub-part 13211 is less than the thickness of the fourth connecting sub-part 13212, which can reduce the welding power when welding the third connecting sub-part 13211 and the second tab 123, reduce the residual thermal stress at the weld mark position, reduce the risk of cracking in the weld pool area, and help improve the reliability of the battery cell 100. The thickness of the fourth connecting sub-part 13212 is also beneficial to improve the current carrying capacity of the third connecting part 1321, and help improve the fast charging performance of the battery cell 100. The thickness of the third connecting sub-part 13211 is small, which helps to reduce space occupation and improve the structural compactness of the battery cell 100.

[0251] In some embodiments, the surface of the third connecting sub-part 13211 facing the first end face 121a is flush with the surface of the fourth connecting sub-part 13212 facing the first end face 121a.

[0252] It is understandable that the surfaces of the third connecting part 13211 facing the first end face 121a and the fourth connecting part 13212 facing the first end face 121a are located on the same plane or approximately on the same plane, that is, the surface of the third connecting part 1321 facing the first end face 121a is a plane or close to a plane.

[0253] By adopting the technical solution of this embodiment, the surface of the third connecting part 13211 facing the first end face 121a can better fit with the second electrode 123, which is beneficial to improve the welding quality of the second electrode 123 and the third connecting part 13211 and improve the welding reliability. In addition, it can also reduce the risk of the fourth connecting part 13212 interfering with other components, which is beneficial to improve the connection reliability of the third connecting part 1321 and the second electrode 123.

[0254] In some embodiments, referring to FIG11, the adapter assembly 130 includes a first insulating member 133, the first insulating member 133 includes a first insulating portion 1331, and the first insulating portion 1331 is connected between the third connecting portion 1321 and the fourth connecting portion 1322.

[0255] In some examples, the first insulating element 133 may refer to an insulating component connected to the first connecting portion 1311 and the third connecting portion 1321. The first insulating element 133 is made of insulating material, such as polypropylene (PP), polyphenylene sulfide (PPS), polyimide (PI), polyethylene (PE), silicon carbide (SiC), ceramics, etc.

[0256] As an example, the first insulating member 133 can be connected to the first connecting part 1311 and the third connecting part 1321 by means of injection molding or the like. Of course, in other examples, the first insulating member 133 can also be fixed to the first connecting part 1311 and the third connecting part 1321 by means of bonding, snap-fitting or the like.

[0257] In some examples, the portion of the first insulating member 133 located between the first connecting portion 1311 and the third connecting portion 1321 is the first insulating portion 1331; for example, referring to FIG11, the first insulating member 133 may only include the first insulating portion 1331, which has an elongated structure, and the opposite sides of the first insulating portion 1331 are connected to the first connecting portion 1311 and the third connecting portion 1321 respectively; of course, in other examples, the first insulating member 133 may also include other portions.

[0258] In some examples, during the manufacturing process of the first adapter 131 and the second adapter 132, metal wires may be present in the first connecting part 1311 and the third connecting part 1321. The overlapping of the metal wires may cause self-discharge of the battery cell 100, affecting the capacity and reliability of the battery cell 100. In addition, during the second bending of the first adapter 131 and the second adapter 132 after the first tab 122 is welded to the first connecting part 1311 and the second tab 123 is welded to the third connecting part 132, the different materials of the first adapter 131 and the second adapter 132 may result in poor synchronous bending of the first adapter 131 and the second adapter 132. This may cause the first connecting part 1311 or the third connecting part 1321 to be stretched, resulting in cracks in the welding area of ​​the first tab 122 and the first connecting part 1311 or the welding area of ​​the second tab 123 and the third connecting part 1321.

[0259] By adopting the technical solution of this embodiment, the first insulating part 1331 is located between the first connecting part 1311 and the third connecting part 1321. On the one hand, the first insulating part 1331 can insulate and separate the first connecting part 1311 and the third connecting part 1321, which can reduce the risk of self-discharge and short circuit of the battery cell 100, which is conducive to the stable performance of the battery cell 100 capacity and improves the reliability of the battery cell 100. On the other hand, the first insulating part 1331 can prevent welding slag and other components from falling from the gap between the first connecting part 1311 and the third connecting part 1321 into the electrode plates of the main body 121, reducing the risk of self-discharge and short circuit of the battery cell 100. The short-circuit risk of battery cell 100 is reduced, further improving the reliability of battery cell 100. In addition, the first insulating part 1331 can connect the first connecting part 1311 and the third connecting part 1321 together. On the one hand, it can reduce the damage to the first adapter 131 and the second adapter 132 during transportation. On the other hand, it can increase the synchronicity of the bending of the first adapter 131 and the second adapter 132, reduce the pulling on the first connecting part 1311 or the third connecting part 1321, and improve the connection reliability of the first tab 122 and the first connecting part 1311, as well as the connection reliability of the second tab 123 and the third connecting part 1321.

[0260] In some embodiments, as shown in Figures 12 and 13, the first insulating member 133 further includes a second insulating portion 1332 connected to the first insulating portion 1331, and a first vacant position 1311c is formed on the side of the first connecting portion 1311 facing away from the first bending portion 1313, and the second insulating portion 1332 is located at the first vacant position 1311c.

[0261] Viewed from a direction perpendicular to the first end face 121a, the first connecting portion 1311 covers a part of the first end face 121a, and there is a vacant area on the side of the first connecting portion 1311 facing away from the first bending portion 1313, which exposes the first end face 121a. This vacant area is the first vacant position 1311c.

[0262] The second insulating part 1332 may refer to the part of the first insulating member 133 located in the first vacant position 1311c; the first insulating part 1331 and the second insulating part 1332 may be integrally formed by injection molding or other methods, or may be fixedly connected by snap-fit ​​or adhesive methods.

[0263] By adopting the technical solution of this embodiment, the setting of the first vacant position 1311c can reduce the size of the first connecting part 1311 and reduce the manufacturing cost of the first adapter 131; in addition, the second insulating part 1332 is provided in the first vacant position 1311c, which can prevent welding slag and other components from falling from the first vacant position 1311c into the electrode plates of the main body 121, reducing the short circuit risk of the battery cell 100 and improving the reliability of the battery cell 100.

[0264] In some embodiments, the first insulating member 133 further includes a third insulating portion 1333 connected to the first insulating portion 1331, and the third connecting portion 1321 forms a second vacant position 1321a on the side opposite to the second bending portion 1323, and the third insulating portion 1333 is located in the second vacant position 1321a.

[0265] Viewed from a direction perpendicular to the first end face 121a, the third connecting portion 1321 covers a part of the first end face 121a, and there is a vacant area on the side of the third connecting portion 1321 facing away from the second bending portion 1323. This vacant area exposes the first end face 121a, and this vacant area is the second vacant position 1321a.

[0266] The third insulating part 1333 can refer to the part of the first insulating member 133 located in the second vacant position 1321a; the first insulating part 1331 and the third insulating part 1333 can be integrally formed by injection molding or other methods, or can be fixedly connected by snap-fit, adhesive or other methods.

[0267] By adopting the technical solution of this embodiment, the setting of the second vacant position 1321a can reduce the size of the third connecting part 1321 and reduce the manufacturing cost of the second adapter 132; in addition, the third insulating part 1333 is provided in the second vacant position 1321a, which can prevent welding slag and other components from falling from the second vacant position 1321a into the electrode plates of the main body 121, reducing the short circuit risk of the battery cell 100 and improving the reliability of the battery cell 100.

[0268] In some embodiments, the first insulating member 133 further includes a second insulating portion 1332 connected to the first insulating portion 1331, a first vacant position 1311c is formed on the side of the first connecting portion 1311 facing away from the first bending portion 1313, and the second insulating portion 1332 is located at the first vacant position 1311c; the first insulating member 133 further includes a third insulating portion 1333 connected to the first insulating portion 1331, a second vacant position 1321a is formed on the side of the third connecting portion 1321 facing away from the second bending portion 1323, and the third insulating portion 1333 is located at the second vacant position 1321a.

[0269] By adopting the technical solution of this embodiment, the size of the first connecting part 1311 and the third connecting part 1321 is reduced, the manufacturing cost of the first adapter 131 and the second adapter 132 is reduced, and the second insulating part 1332 and the third insulating part 1333 can prevent welding slag from falling between the electrodes of the main body part 121, reduce the short circuit risk of the battery cell 100, and further improve the reliability of the battery cell 100.

[0270] In some embodiments, the first insulating member 133 further includes a fourth insulating portion 1334, the first connecting portion 1311 has a first notch 1311d on the side facing away from the third connecting portion 1321, and the fourth insulating portion 1334 is located at the first notch 1311d and connected to the first connecting portion 1311.

[0271] The first connecting part 1311 removes some material from the side facing away from the third connecting part 1321, thereby forming a notch, which is the first notch 1311d.

[0272] The fourth insulating part 1334 may refer to the part of the first insulating member 133 located at the first notch 1311d; the fourth insulating part 1334 and the first connecting part 1311 may be integrally formed by injection molding or other means, or may be fixedly connected by snap-fit ​​or adhesive.

[0273] By adopting the technical solution of this embodiment, the setting of the first notch 1311d can reduce the size of the first connecting part 1311 and reduce the manufacturing cost of the first adapter 131; in addition, the fourth insulating part 1334 is provided at the first notch 1311d, which can prevent the welding slag from the first notch 1311d from falling from the first notch 1311d into the electrode plates of the main body 121, reduce the short circuit risk of the battery cell 100, and improve the reliability of the battery cell 100.

[0274] In some embodiments, the first insulating member 133 further includes a fifth insulating portion 1335, and the third connecting portion 1321 has a second notch 1321b on its side facing away from the first connecting portion 1311. The fifth insulating portion 1335 is located in the second notch 1321b and is connected to the third connecting portion 1321.

[0275] The third connecting part 1321 removes some material from the side facing away from the first connecting part 1311, thereby forming a notch, which is the second notch 1321b.

[0276] The fifth insulating part 1335 may refer to the part of the first insulating member 133 located at the second notch 1321b; the fifth insulating part 1335 and the third connecting part 1321 may be integrally formed by injection molding or other methods, or may be fixedly connected by snap-fit ​​or adhesive methods.

[0277] By adopting the technical solution of this embodiment, the setting of the second notch 1321b can reduce the size of the third connecting part 1321 and reduce the manufacturing cost of the second adapter 132; in addition, the fifth insulating part 1335 is provided at the second notch 1321b, which can prevent the welding slag from the welding process from falling from the second notch 1321b into the electrode plates of the main body 121, reducing the short circuit risk of the battery cell 100 and improving the reliability of the battery cell 100.

[0278] In some embodiments, the first insulating member 133 further includes a fourth insulating portion 1334, the first connecting portion 1311 has a first notch 1311d on the side facing away from the third connecting portion 1321, and the fourth insulating portion 1334 is located at the first notch 1311d and connected to the first connecting portion 1311; the first insulating member 133 also includes a fifth insulating portion 1335, the third connecting portion 1321 has a second notch 1321b on the side facing away from the first connecting portion 1311, and the fifth insulating portion 1335 is located at the second notch 1321b and connected to the third connecting portion 1321.

[0279] As an example, the first notch 1311d is located near the first bend 1313, the second notch 1321b is located near the second bend 1323, the second insulating portion 1332, the first connecting portion 1311 and the fourth insulating portion 1334 can form a semi-circular structure, the third insulating portion 1333, the third connecting portion 1321 and the fifth insulating portion 1335 can form a semi-circular structure, and these two semi-circular structures and the first insulating portion 1331 can form a circular structure, thereby substantially completely covering the first end face 121a.

[0280] By adopting the technical solution of this embodiment, the manufacturing cost of the first adapter 131 and the second adapter 132 can be reduced, welding slag can be blocked, the short circuit risk of the battery cell 100 can be reduced, and the reliability of the battery cell 100 can be improved.

[0281] In some embodiments, referring to FIG14, the first insulating member 133 further includes a sixth insulating portion 1336 connected to the first insulating portion 1331, and at least a portion of the surface of the first connecting portion 1311 facing away from the first end face 121a is connected to the sixth insulating portion 1336.

[0282] In some examples, the portion of the first insulating member 133 covering the surface of the first connecting portion 1311 facing away from the first end face 121a forms a sixth insulating portion 1336. The sixth insulating portion 1336 may cover a portion of the first connecting portion 1311 facing away from the first end face 121a, or it may cover the entire surface of the first connecting portion 1311 facing away from the first end face 121a.

[0283] As an example, the sixth insulating part 1336, the first connecting part 1311 and the first insulating part 1331 can be integrally formed by injection molding or other methods, or they can be fixedly connected by snap-fitting, bonding or other methods.

[0284] By adopting the technical solution of this embodiment, the sixth insulating part 1336 can increase the connection area between the first insulating member 133 and the first connecting part 1311, thereby improving the connection reliability between the first insulating member 133 and the first connecting part 1311, and improving the connection reliability between the first connecting part 1311 and the third connecting part 1321, which is beneficial to improving the reliability of the battery cell 100.

[0285] In some embodiments, at least a portion of the surface of the first connecting portion 1311 facing the first end face 121a is connected to a sixth insulating portion 1336.

[0286] In some examples, the portion of the first insulating member 133 covering the surface of the first connecting portion 1311 facing the first end face 121a forms a sixth insulating portion 1336. The sixth insulating portion 1336 may cover a portion of the first connecting portion 1311 facing the first end face 121a, or it may cover the entire surface of the first connecting portion 1311 facing the first end face 121a.

[0287] As an example, the sixth insulating part 1336, the first connecting part 1311 and the first insulating part 1331 can be integrally formed by injection molding or other methods, or they can be fixedly connected by snap-fitting, bonding or other methods.

[0288] By adopting the technical solution of this embodiment, the sixth insulating part 1336 can increase the connection area between the first insulating member 133 and the first connecting part 1311, thereby improving the connection reliability between the first insulating member 133 and the first connecting part 1311, and improving the connection reliability between the first connecting part 1311 and the third connecting part 1321, which is beneficial to improving the reliability of the battery cell 100.

[0289] In some embodiments, the first insulating member 133 further includes a sixth insulating portion 1336 connected to the first insulating portion 1331, and at least a portion of the surface of the first connecting portion 1311 facing away from the first end face 121a is connected to the sixth insulating portion 1336, and at least a portion of the surface of the first connecting portion 1311 facing the first end face 121a is connected to the sixth insulating portion 1336.

[0290] The first connecting part 1311 is connected to the sixth insulating part 1336 on both opposite surfaces. The first connecting part 1311 can be fixed between the two sixth insulating parts 1336. The connection reliability between the first insulating part 133 and the first connecting part 1311 is better, which can effectively improve the connection reliability between the first connecting part 1311 and the third connecting part 1321, and is conducive to improving the reliability of the battery cell 100.

[0291] In some embodiments, the first tab 122 is welded to the first connecting portion 1311 to form a first solder mark 1311a, and the sixth insulating portion 1336 has a first clearance groove 133a to avoid the first solder mark 1311a.

[0292] In some examples, the first solder mark 1311a may refer to the trace left by the welding of the first tab 122 to the first connection 1311.

[0293] In some examples, a groove is provided at the position of the sixth insulating portion 1336 opposite to the first solder mark 1311a, and this groove is the first clearance groove 133a.

[0294] In some examples, when viewed along a direction perpendicular to the first end face 121a, the sixth insulating portion 1336 does not coincide with the first solder mark 1311a, that is, at least a portion of the first solder mark 1311a is located within the first clearance groove 133a.

[0295] In some examples, the two opposite surfaces of the first connecting portion 1311 are connected to the sixth insulating portion 1336, and both sixth insulating portions 1336 can be provided with the first clearance groove 133a.

[0296] As an example, the shape of the first clearance groove 133a can be various, such as rectangular, trumpet-shaped, etc. For example, the first clearance groove 133a is trumpet-shaped, and the size of the first clearance groove 133a increases in the direction away from the first insulating part 1331, so that the size of the sixth insulating part 1336 is large at both ends and small in the middle.

[0297] By adopting the technical solution of this embodiment, the setting of the first clearance groove 133a can reserve a larger welding area for the first connecting part 1311 and the first electrode 122, thereby improving the current carrying capacity of the battery cell 100. At the same time, the first insulating part 133 and the first connecting part 1311 have a larger connection area, thereby improving the connection reliability of the first connecting part 1311 and the third connecting part 1321. This design can better balance the current carrying capacity and the reliability of the battery cell 100.

[0298] In some embodiments, the first insulating member 133 further includes a seventh insulating portion 1337 connected to the first insulating portion 1331, and at least a portion of the surface of the third connecting portion 1321 facing away from the first end face 121a is connected to the seventh insulating portion 1337.

[0299] In some examples, the portion of the first insulating member 133 covering the surface of the third connecting portion 1321 facing away from the first end face 121a forms a seventh insulating portion 1337. The seventh insulating portion 1337 may cover a portion of the third connecting portion 1321 facing away from the first end face 121a, or it may cover the entire surface of the third connecting portion 1321 facing away from the first end face 121a.

[0300] As an example, the seventh insulating part 1337, the third connecting part 1321 and the first insulating part 1331 can be integrally formed by injection molding or other methods, or they can be fixedly connected by snap-fitting, bonding or other methods.

[0301] By adopting the technical solution of this embodiment, the seventh insulating part 1337 can increase the connection area between the first insulating member 133 and the third connecting part 1321, thereby improving the connection reliability between the first insulating member 133 and the third connecting part 1321, and improving the connection reliability between the first connecting part 1311 and the third connecting part 1321, which is beneficial to improving the reliability of the battery cell 100.

[0302] In some embodiments, at least a portion of the surface of the third connecting portion 1321 facing the first end face 121a is connected to the seventh insulating portion 1337.

[0303] In some examples, the portion of the first insulating member 133 covering the surface of the third connecting portion 1321 facing the first end face 121a forms a seventh insulating portion 1337. The seventh insulating portion 1337 may cover a portion of the third connecting portion 1321 facing the first end face 121a, or it may cover the entire surface of the third connecting portion 1321 facing the first end face 121a.

[0304] As an example, the seventh insulating part 1337, the third connecting part 1321 and the first insulating part 1331 can be integrally formed by injection molding or other methods, or they can be fixedly connected by snap-fitting, bonding or other methods.

[0305] By adopting the technical solution of this embodiment, the seventh insulating part 1337 can increase the connection area between the first insulating member 133 and the third connecting part 1321, thereby improving the connection reliability between the first insulating member 133 and the third connecting part 1321, and improving the connection reliability between the first connecting part 1311 and the third connecting part 1321, which is beneficial to improving the reliability of the battery cell 100.

[0306] In some embodiments, the first insulating member 133 further includes a seventh insulating portion 1337 connected to the first insulating portion 1331, and at least a portion of the surface of the third connecting portion 1321 facing away from the first end face 121a is connected to the seventh insulating portion 1337, and at least a portion of the surface of the third connecting portion 1321 facing the first end face 121a is connected to the seventh insulating portion 1337.

[0307] The third connecting part 1321 is connected to the seventh insulating part 1337 on both opposite surfaces. The third connecting part 1321 can be fixed between the two seventh insulating parts 1337. The connection reliability between the first insulating part 133 and the third connecting part 1321 is better, which can effectively improve the connection reliability between the first connecting part 1311 and the third connecting part 1321, and is conducive to improving the reliability of the battery cell 100.

[0308] In some embodiments, the second tab 123 is welded to the third connecting portion 1321 to form a second solder mark 1321a, and the seventh insulating portion 1337 has a second clearance groove 133b that avoids the second solder mark 1321a.

[0309] In some examples, when viewed along a direction perpendicular to the first end face 121a, the seventh insulating portion 1337 does not coincide with the second solder mark 1321a, that is, at least a portion of the second solder mark 1321a is located within the second clearance groove 133b.

[0310] In some examples, the third connecting part 1321 is connected to the seventh insulating part 1337 on both opposite surfaces, and both seventh insulating parts 1337 can be provided with a second clearance groove 133b.

[0311] As an example, the shape of the second clearance groove 133b can be various, such as rectangular, trumpet-shaped, etc. For example, the second clearance groove 133b is trumpet-shaped, and the size of the second clearance groove 133b increases in the direction away from the first insulating part 1331, so that the seventh insulating part 1337 is large at both ends and small in the middle.

[0312] By adopting the technical solution of this embodiment, the setting of the second clearance groove 133b can reserve a larger welding area for the third connecting part 1321 and the first electrode 122, thereby improving the current carrying capacity of the battery cell 100. At the same time, the first insulating part 133 and the third connecting part 1321 have a larger connection area, thereby improving the connection reliability of the first connecting part 1311 and the third connecting part 1321. This design can better balance the current carrying capacity and the reliability of the battery cell 100.

[0313] In some embodiments, along the direction perpendicular to the first end face 121a, the projected area of ​​the first insulating member 133 is S3, the area of ​​the first end face 121a is S2, and 0.05≤S3 / S2≤0.7.

[0314] In some examples, the projected area S3 of the first insulating member 133 may refer to the area of ​​the projected image of the first insulating member 133 on the first end face 121a.

[0315] As an example, referring to Figure 11, the projected area S3 of the first insulating member 133 can refer to the area of ​​the surface of the first insulating part 1331 facing away from the first end face 121a.

[0316] As an example, referring to Figures 12 and 13, the projected area S3 of the first insulating member 133 can refer to the sum of the area of ​​the surface of the first insulating part 1331 facing away from the first end face 121a, the area of ​​the surface of the second insulating part 1332 facing away from the first end face 121a, the area of ​​the surface of the third insulating part 1333 facing away from the first end face 121a, the area of ​​the surface of the fourth insulating part 1334 facing away from the first end face 121a, and the area of ​​the surface of the fifth insulating part 1335 facing away from the first end face 121a.

[0317] As an example, referring to FIG14, the projected area S3 of the first insulating member 133 can refer to the sum of the area of ​​the surface of the first insulating part 1331 facing away from the first end face 121a, the area of ​​the surface of the sixth insulating part 1336 near the first electrode lead-out part 110a facing away from the first end face 121a, and the area of ​​the surface of the seventh insulating part 1337 near the second electrode lead-out part 110b facing away from the first end face 121a.

[0318] In some examples, the value of S3 / S2 can be 0.05, 0.7, or any value between 0.05 and 0.7.

[0319] For example, the value of S3 / S2 can be, but is not limited to, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, or 0.7.

[0320] By adopting the technical solution of this embodiment, the design of S3 / S2≥0.05 allows the first insulating component 133 to prevent welding slag and other components from falling between the electrodes of the main body 121, reducing the short-circuit risk of the battery cell 100 and improving the reliability of the battery cell 100. The design of S3 / S2≤0.7 allows the connection areas of the first connecting part 1311 and the third connecting part 1321 with the first tab 122 and the second tab 123 to be larger, which is beneficial to improving the overcurrent capacity and fast charging capability of the battery cell 100. This design can better balance the reliability and fast charging capability of the battery cell 100.

[0321] In some embodiments, along the direction perpendicular to the first end face 121a, the projected area of ​​the first insulating member 133, the first connecting portion 1311 and the third connecting portion 1321 is S4, and the area of ​​the first end face 121a is S2, where 0.8≤S4 / S2≤0.95.

[0322] In some examples, the first insulating member 133, the first connecting part 1311 and the third connecting part 1321 are connected as an integral structure. The projected area of ​​this integral structure along the direction perpendicular to the first end face 121a is the projected area S4 of the first insulating member 133, the first connecting part 1311 and the third connecting part 1321.

[0323] In some examples, the value of S4 / S2 can be 0.8, 0.95, or any value between 0.8 and 0.95.

[0324] For example, the value of S4 / S2 can be, but is not limited to, 0.8, 0.9, or 0.95.

[0325] By adopting the technical solution of this embodiment, the design of S4 / S2≥0.8 makes most of the area of ​​the first end face 121a covered, reducing the risk of welding slag and other components falling between the electrodes of the main body 121 and the risk of short circuit of the battery cell 100, which is conducive to improving the reliability of the battery cell 100. The design of S4 / S2≤0.95 makes it convenient for the adapter 130 to be installed in the housing 110, and facilitates the assembly of the battery cell 100.

[0326] In some embodiments, as shown in Figures 15-17, the outer casing 110 has a liquid injection hole 110c, and the first insulating part 1331 has a first through hole 133c at a position corresponding to the liquid injection hole 110c.

[0327] In some examples, injection port 110c may refer to a through-hole for injecting electrolyte into housing 110.

[0328] In some examples, the first through hole 133c may refer to a through hole penetrating the first insulating part 1331, and the first through hole 133c is disposed opposite to the liquid injection hole 110c. The shape of the first through hole 133c can be various, such as circular, triangular, U-shaped, etc.

[0329] By adopting the technical solution of this embodiment, the electrolyte flows into the electrode assembly 120 in a timely manner through the injection hole 110c and the first through hole 133c, thereby improving the wetting speed of the electrode assembly 120 and improving the performance of the battery cell 100.

[0330] In some embodiments, as shown in FIG18, the first through hole 133c penetrates the side of the first insulating portion 1331 away from the first bent portion 1313.

[0331] The first through hole 133c has an opening formed on the side of the first insulating part 1331 away from the first bent part 1313.

[0332] By adopting the technical solution of this embodiment, the area of ​​the first through hole 133c 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 110c and the first through hole 133c, thereby improving the wetting speed of the electrode assembly 120 and improving the performance of the battery cell 100.

[0333] In some embodiments, the electrode assembly 120 has a central hole 121b that penetrates through the first end face 121a, and the first insulating portion 1331 has a second through hole 133d at a position corresponding to the central hole 121b.

[0334] In some examples, the center hole 121b 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.

[0335] In some examples, the second through hole 133d can refer to a through hole penetrating the first insulating part 1331, and the second through hole 133d is disposed opposite to the central hole 121b. The shape of the second through hole 133d can be various, such as circular, triangular, U-shaped, etc.

[0336] 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 121b and the second through hole 133d, which is beneficial to improving the reliability of the battery cell 100. In addition, the electrolyte can also flow into the central hole 121b through the second through hole 133d, which is beneficial to improving the wetting speed of the electrode assembly 120 and improving the performance of the battery cell 100.

[0337] In some embodiments, the adapter assembly 130 further includes a second insulating member 134 connected between the second connecting portion 1312 and the fourth connecting portion 1322.

[0338] The second insulating element 134 may refer to a component made of insulating material. The material of the second insulating element 134 may be the same as or different from that of the first insulating element 133.

[0339] In some examples, the second insulating member 134 can be fixed between the second connecting part 1312 and the fourth connecting part 1322 by means of injection molding, etc. Of course, in other examples, the second insulating member 134 can also be connected to the second connecting part 1312 and the fourth connecting part 1322 by means of bonding, snap-fitting, etc.

[0340] By adopting the technical solution of this embodiment, the second insulating member 134 can insulate and separate the second connecting part 1312 and the fourth connecting part 1322, which is beneficial to improving the insulation reliability between the first adapter 131 and the second adapter 132, and is beneficial to improving the reliability of the battery cell 100.

[0341] In some embodiments, the second electrode lead-out portion 110b is riveted to the fourth connecting portion 1322.

[0342] As an example, the fourth connecting part 1322 has a third connecting hole, the second electrode lead-out part 110b has a fourth connecting hole, and the second rivet 110e passes through the third connecting hole and the fourth connecting hole, so that the second electrode lead-out part 110b and the fourth connecting part 1322 can be fixed together.

[0343] By adopting the technical solution of this embodiment, the fourth connecting part 1322 and the second electrode lead-out part 110b are connected by riveting, so that there are no welding defects between the second electrode lead-out part 110b and the second adapter 132, reducing the risk of electrolyte leakage or external moisture entering the battery cell 100, which is beneficial to improving the performance and reliability of the battery cell 100. That is, the battery cell 100 of this application embodiment can not only overcome the welding defects caused by penetration welding, but also reduce the space waste of the battery cell 100 and improve the structural compactness of the battery cell 100.

[0344] In some embodiments, referring to FIG1, the housing 110 includes a housing 112 and an end cap 111, the electrode assembly 120 is located inside the housing 112, the end cap 111 covers the opening of the housing 112, and the first electrode lead-out portion 110a and the second electrode lead-out portion 110b are provided on the end cap 111.

[0345] By adopting the technical solution of this embodiment, the outer casing 110 adopts the structure of end cap 111 and housing 112. The structure of the outer casing 110 is simple and it is also convenient to assemble the battery cell 100. In addition, the first electrode lead-out portion 110a and the second electrode lead-out portion 110b are provided on the end cap 111, which is also convenient to connect to the external circuit.

[0346] In some embodiments, referring to Figures 15-18, a third insulating member 141 is provided on the inner side of the end cap 111. The third insulating member 141 insulatingly separates the end cap 111 from the second connecting portion 1312 and the end cap 111 from the fourth connecting portion 1322, thereby insulatingly separating the second adapter 132 from the first adapter 131. A fourth insulating member 142 is provided between the end cap 111 and the first electrode lead-out portion 110a and the second electrode lead-out portion 110b, thereby insulatingly separating the first electrode lead-out portion 110a from the end cap 111 and the end cap 111 from the second electrode lead-out portion 110b. A fifth insulating member 143 is provided between the first electrode lead-out portion 110b, the first electrode lead-out portion 110a, and the second electrode lead-out portion 110b to insulatingly separate the first electrode lead-out portion 110a and the second electrode lead-out portion 110b. An injection hole 110c is provided at the end cap 111. The third insulating member 141 has a third through hole 141a, located between the injection hole 110c and the first through hole 133c, allowing electrolyte to flow into the electrode assembly 120 in a timely manner through the injection hole 110c, the third through hole 141a, and the first through hole 133c. The fourth insulating member 142 and the fifth insulating member 143 can be integrally formed, or they can be separately formed and then connected together.

[0347] In some embodiments, a sealing pin 150 is provided inside the injection hole 110c to seal the injection hole 110c and reduce the risk of electrolyte leakage.

[0348] In some embodiments, the battery cell 100 is a cylindrical battery cell or a prismatic battery cell.

[0349] In some examples, the battery cell 100 is a cylindrical battery cell, the casing 110 is cylindrical, and the electrode assembly 120 is cylindrical.

[0350] 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.

[0351] 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.

[0352] The present application will be described below with reference to some specific embodiments.

[0353] Example 1

[0354] In this embodiment, referring to Figures 1-9, 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 111 and a shell 112. The end cap 111 is provided with a first electrode lead-out portion 110a, a second electrode lead-out portion 110b, and a liquid injection hole 110c. The electrode assembly 120 is disposed on the shell 112, and the end cap 111 covers the opening of the shell 112.

[0355] In this embodiment, the electrode assembly 120 includes a main body 121, a first electrode tab 122, and a second electrode tab 123. The main body 121 has a first end face 121a, which is disposed facing the end cap 111. The first electrode tab 122 and the second electrode tab 123 are led out from the first end face 121a.

[0356] In this embodiment, the adapter assembly 130 includes a first adapter 131 and a second adapter 132 spaced apart. The first adapter 131 includes a first connecting portion 1311, a second connecting portion 1312, and a first bent portion 1313 connected between the first connecting portion 1311 and the second connecting portion 1312. The first connecting portion 1311 is welded to the first electrode tab 122, and the second connecting portion 1312 is riveted to the first electrode lead-out portion 110a. The first connecting portion 1311 and the second connecting portion 1312 are stacked. The first connecting portion 1311 is located between the second connecting portion 1312 and the first end face 121a. Along the stacking direction perpendicular to the first connecting portion 1311 and the second connecting portion 1312, the first bent portion 1313 is located on the same side of the first connecting portion 1311 and the second connecting portion 1312, so that the first adapter 131 forms a double-layer structure. The second adapter 132 includes a third connecting portion 1321, a fourth connecting portion 1322, and a second bending portion 1323 connected between the third connecting portion 1321 and the fourth connecting portion 1322. The third connecting portion 1321 is welded to the second electrode tab 123, and the fourth connecting portion 1322 is riveted to the second electrode lead-out portion 110b. The third connecting portion 1321 and the fourth connecting portion 1322 are stacked, with the third connecting portion 1321 located between the fourth connecting portion 1322 and the first end face 121a. Along the stacking direction perpendicular to the third connecting portion 1321 and the fourth connecting portion 1322, the second bending portion 1323 is located on the same side of the third connecting portion 1321 and the fourth connecting portion 1322, so that the second adapter 132 forms a double-layer structure.

[0357] In this embodiment, the first connecting portion 1311 includes a first connecting sub-portion 13111 and a second connecting sub-portion 13112 connected together. The second connecting sub-portion 13112 is connected to the first bending portion 1313, and the first connecting sub-portion 13111 is welded to the first electrode tab 122. The thickness of the first connecting sub-portion 13111 is t1, and the thickness of the second connecting sub-portion 13112 is t2, wherein t1 < t2.

[0358] In this embodiment, the surface of the first connecting sub-part 13111 facing the first end face 121a is flush with the surface of the second connecting sub-part 13112 facing the first end face 121a.

[0359] In this embodiment, the third connecting portion 1321 includes a third connecting sub-portion 13211 and a fourth connecting sub-portion 13212 connected to each other. The fourth connecting sub-portion 13212 is connected to the second bending portion 1323, and the third connecting sub-portion 13211 is welded to the second tab 123. The thickness of the third connecting sub-portion 13211 is less than the thickness of the fourth connecting sub-portion 13212.

[0360] In this embodiment, the surface of the third connecting sub-part 13211 facing the first end face 121a is flush with the surface of the fourth connecting sub-part 13212 facing the first end face 121a.

[0361] In this embodiment, the surface of the first connecting part 13111 facing away from the first end face 121a is provided with a first coating 1311a1, which includes at least one of a nickel layer and a black ink layer.

[0362] Example 2

[0363] The difference between this embodiment and Embodiment 1 is that, as shown in FIG10, the surface of the first connecting part 13111 facing the first end face 121a forms a thinning surface 1311b.

[0364] Example 3

[0365] The difference between this embodiment and Embodiment 1 is that, as shown in FIG11, the adapter assembly 130 includes a first insulating member 133, the first insulating member 133 includes a first insulating portion 1331, and the first insulating portion 1331 is connected between the third connecting portion 1321 and the fourth connecting portion 1322.

[0366] Example 4

[0367] The difference between this embodiment and Embodiment 3 is as follows: Referring to Figures 12-13, the first insulating member 133 further includes a second insulating part 1332 connected to the first insulating part 1331, and a first vacant position 1311c is formed on the side of the first connecting part 1311 facing away from the first bending part 1313, and the second insulating part 1332 is located in the first vacant position 1311c; the first insulating member 133 also includes a third insulating part 1333 connected to the first insulating part 1331, and a second vacant position 1321a is formed on the side of the third connecting part 1321 facing away from the second bending part 1323, and the third insulating part 1333 is located in the second vacant position 1321a.

[0368] In this embodiment, the first insulating member 133 further includes a fourth insulating portion 1334. The first connecting portion 1311 has a first notch 1311d on its side facing away from the third connecting portion 1321. The fourth insulating portion 1334 is located at the first notch 1311d and connected to the first connecting portion 1311. The first insulating member 133 also includes a fifth insulating portion 1335. The third connecting portion 1321 has a second notch 1321b on its side facing away from the first connecting portion 1311. The fifth insulating portion 1335 is located at the second notch 1321b and connected to the third connecting portion 1321.

[0369] Example 5

[0370] The difference between this embodiment and embodiment three is that, as shown in FIG14, the first insulating member 133 further includes a sixth insulating part 1336 connected to the first insulating part 1331, and at least a portion of the surface of the first connecting part 1311 facing away from the first end face 121a is connected to the sixth insulating part 1336; at least a portion of the surface of the first connecting part 1311 facing the first end face 121a is connected to the sixth insulating part 1336.

[0371] In this embodiment, the first tab 122 is welded to the first connecting portion 1311 to form a first solder mark 1311a, and the sixth insulating portion 1336 has a first clearance groove 133a to avoid the first solder mark 1311a.

[0372] In this embodiment, the first insulating member 133 further includes a seventh insulating part 1337 connected to the first insulating part 1331, and at least a portion of the surface of the third connecting part 1321 facing away from the first end face 121a is connected to the seventh insulating part 1337; at least a portion of the surface of the third connecting part 1321 facing the first end face 121a is connected to the seventh insulating part 1337.

[0373] In this embodiment, the second tab 123 is welded to the third connecting portion 1321 to form a second solder mark 1321a, and the seventh insulating portion 1337 has a second clearance groove 133b to avoid the second solder mark 1321a.

[0374] Example 6

[0375] The difference between this embodiment and embodiment three is that, as shown in Figures 15-17, the end cap 111 has an injection hole 110c, and the first insulating part 1331 has a first through hole 133c at the position corresponding to the injection hole 110c.

[0376] Example 7

[0377] The difference between this embodiment and embodiment three is that, as shown in Figure 18, the electrode assembly 120 has a central hole 121b, which penetrates the first end face 121a, and the first insulating part 1331 has a second through hole 133d at the position corresponding to the central hole 121b.

[0378] In this embodiment, the first through hole 133c penetrates the side of the first insulating portion 1331 away from the first bent portion 1313.

[0379] In some embodiments, referring to FIG1, a method for manufacturing a battery cell is provided, including:

[0380] The second connecting portion 1312 of the first adapter 131 is connected to the first electrode lead-out portion 110a on the end cap 111, and the fourth connecting portion 1322 of the second adapter 132 is connected to the second electrode lead-out portion 110b on the end cap 111.

[0381] The first bent portion 1313 of the first adapter 131 and the second bent portion 1323 of the second adapter 132 are bent so that the first adapter 131 and the second adapter 132 form an angled structure.

[0382] The first connecting portion 1311 of the first adapter 131 is connected to the first electrode tab 122, and the third connecting portion 1321 of the second adapter 132 is connected to the second electrode tab 123; wherein, the electrode assembly 120 is located inside the housing 112, and the first end face 121a of the electrode assembly 120 has the first electrode tab 122 and the second electrode tab 123 extended out.

[0383] Continue bending the first bent portion 1313 of the first adapter 131 and the second bent portion 1323 of the second adapter 132, so that the end cap 111 covers the housing 112.

[0384] The first adapter 131 and the second adapter 132 are spaced apart. After bending, the first adapter 131 is divided into a first connecting portion 1311, a second connecting portion 1312, and a first bent portion 1313. The first bent portion 1313 is connected between the first connecting portion 1311 and the second connecting portion 1312. The first connecting portion 1311 is connected to the first electrode tab 122, and the second connecting portion 1312 is connected to the first electrode lead-out portion 110a. The first connecting portion 1311 and the second connecting portion 1312 are stacked. The first connecting portion 1311 is located between the second connecting portion 1312 and the first end face 121a. Along the stacking direction perpendicular to the first connecting portion 1311 and the second connecting portion 1312, the first bent portion 1313 is located on the same side of the first connecting portion 1311 and the second connecting portion 1312, so that the first adapter 1311... The connector 131 forms a double-layer structure; after the second adapter 132 is bent, the second adapter 132 is divided into a third connecting part 1321, a fourth connecting part 1322, and a second bent part 1323. The second bent part 1323 is connected between the third connecting part 1321 and the fourth connecting part 1322. The third connecting part 1321 is connected to the second electrode tab 123, and the fourth connecting part 1322 is connected to the second electrode lead-out part 110b. The third connecting part 1321 and the fourth connecting part 1322 are stacked. The third connecting part 1321 is located between the fourth connecting part 1322 and the first end face 121a. Along the stacking direction perpendicular to the third connecting part 1321 and the fourth connecting part 1322, the second bent part 1323 is located on the same side of the third connecting part 1321 and the fourth connecting part 1322, so that the second adapter 132 forms a double-layer structure.

[0385] By adopting the technical solution of this embodiment, the assembly method of the battery cell 100 is simple and convenient for the manufacture of the battery cell 100. In addition, the first adapter 131 and the second adapter 132 are both double-layer structures, which helps to save the internal space of the battery cell 100, improve the structural compactness of the battery cell 100, and improve the energy density of the battery cell 100.

[0386] Thirdly, referring to FIG19, a battery device 1100 is provided, including a plurality of the above-described battery cells 100 or a plurality of battery cells 100 obtained by the above-described battery cell manufacturing method.

[0387] 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.

[0388] In some examples, a battery cell assembly is typically formed by arranging multiple battery cells 100 together.

[0389] 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.

[0390] 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.

[0391] 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.

[0392] 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.

[0393] 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.

[0394] 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.

[0395] 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.

[0396] The battery device 1100 of this application embodiment has a compact structure of battery cell 100, which is beneficial to improving the energy density of battery cell 100, and thus to improving the energy density and range of battery device 1100.

[0397] Fourthly, referring to FIG20, an energy storage device 2000 is provided, including a plurality of the above-described battery cells 100, a plurality of battery cells 100 obtained by the above-described battery cell manufacturing method, 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.

[0398] 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.

[0399] 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.

[0400] In some examples, the energy storage device 2000 is an energy storage container or an energy storage cabinet.

[0401] 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.

[0402] 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.

[0403] 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.

[0404] 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.

[0405] As an example, the central control module can serve as the battery management unit of the energy storage device 2000, used for monitoring and managing the device. The central control module can monitor information such as the current, voltage, power, state of charge, and temperature of the energy storage device 2000. For example, it can control the charging and discharging current and voltage of the device. As an example, the central control module includes modules such as the Insulation Monitoring Module (IMM), the Master Battery Management Unit (MBMU), the Ethernet (ETH) module, and the fiber optic conversion module.

[0406] 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.

[0407] As an example, the power distribution module can be used to distribute power to modules in the energy storage device 2000 that require electricity.

[0408] The energy storage device 2000 of this application embodiment has good energy density of battery cell 100 and battery device 1100, which is beneficial to improving the energy density and range of the energy storage device 2000.

[0409] Fourthly, referring to Figure 21, 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 the power generation device and the energy storage device 2000.

[0410] 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.

[0411] The energy storage system 3000 and energy storage device 2000 of this application embodiment have good energy density and endurance, which is beneficial to improving the endurance of the energy storage system 3000.

[0412] Fifthly, referring to FIG22, an electrical device is provided, including the battery cell 100 described above, the battery cell 100 obtained by the battery cell manufacturing method described above, the battery device 1100 described above, the energy storage device 2000 described above, 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.

[0413] 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.

[0414] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device.

[0415] 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.

[0416] 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.

[0417] The energy storage system 3000 of this application embodiment has good energy density of battery cell 100 and battery device 1100, which is beneficial to improving the endurance of the power device.

[0418] Sixthly, referring to FIG23, a charging network 4000 is provided, including a charging pile 4100 and the aforementioned energy storage device 2000 or the aforementioned energy storage system 3000, wherein the energy storage device 2000 is used to provide electrical energy to the charging pile 4100.

[0419] 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.

[0420] 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.

[0421] The energy storage system 3000, energy storage device 2000, and energy storage system 3000 of this application embodiment have good endurance, which is beneficial to improving the endurance of charging network 4000.

[0422] 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.

[0423] 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 is provided with a first electrode lead-out section; The electrode assembly is at least partially located within the housing; The electrode assembly includes a main body and a first electrode tab, the main body having a first end face, and the first electrode tab extending from the first end face; An adapter assembly includes a first adapter, the first adapter including a first connecting portion, a second connecting portion, and a first bent portion connected between the first connecting portion and the second connecting portion. The first connecting portion is connected to a first electrode tab, and the second connecting portion is connected to a first electrode lead-out portion. The first connecting portion and the second connecting portion are stacked, the first connecting portion is located between the second connecting portion and the first end face, along a stacking direction perpendicular to the first connecting portion and the second connecting portion, and the first bent portion is located on the same side of the first connecting portion and the second connecting portion, so that the first adapter forms a double-layer structure.

2. The battery cell of claim 1, wherein: The first electrode lead-out portion is riveted to the second connecting portion.

3. The battery cell of claim 1 or 2, wherein: Along the direction perpendicular to the first end face, the projected area of ​​the first connecting part is S1, and the area of ​​the first end face is S2, wherein 0.3≤S1 / S2≤0.95; optionally, 0.4≤S1 / S2≤0.

7.

4. The battery cell of any one of claims 1-3, wherein: The first connecting part includes a first connecting sub-part and a second connecting sub-part connected to each other. The second connecting sub-part is connected to the first bending part, and the first connecting sub-part is welded to the first electrode lug. The thickness of the first connecting sub-part is t1, and the thickness of the second connecting sub-part is t2, wherein t1 < t2.

5. The battery cell of claim 4, wherein: 0.1≤t1 / t2≤0.9; Optionally, 0.4 ≤ t1 / t2 ≤ 0.

8.

6. The battery cell of claim 4 or 5, wherein: 0.1mm≤t1≤0.7mm, optionally, 0.2mm≤t1≤0.5mm.

7. The battery cell of any one of claims 4-6, wherein: The surface of the first connecting part facing the first end face is flush with the surface of the second connecting part facing the first end face.

8. The battery cell of any one of claims 4-7, wherein: The surface of the first connector facing away from the first end face is provided with a first coating, the first coating including at least one of a nickel layer and a black ink layer.

9. The battery cell of any one of claims 4-7, wherein: The surface roughness Ra of the surface of the first connecting part facing away from the first end face ranges from 3.2 μm to 200 μm. Optionally, the surface roughness Ra of the surface of the first connecting part facing away from the first end face ranges from 50 μm to 110 μm.

10. The battery cell of claim 8 or 9, wherein: The surface of the first connecting part facing the first end face forms a thinning surface.

11. The battery cell of any one of claims 1-10, wherein: The outer casing is provided with a second electrode lead-out portion, and the electrode assembly includes a second electrode with a polarity different from that of the first electrode tab, the second electrode tab being led out from the first end face; The adapter assembly includes a second adapter spaced apart from the first adapter. The second adapter includes a third connecting portion, a fourth connecting portion, and a second bent portion connected between the third connecting portion and the fourth connecting portion. The third connecting portion is connected to the second electrode tab, and the fourth connecting portion is connected to the second electrode lead-out portion. The third connecting portion and the fourth connecting portion are stacked, with the third connecting portion located between the fourth connecting portion and the first end face. Along a stacking direction perpendicular to the third connecting portion and the fourth connecting portion, the second bent portion is located on the same side of the third connecting portion and the fourth connecting portion, so that the second adapter forms a double-layer structure.

12. The battery cell of claim 11, wherein: The third connecting part includes a third connecting sub-part and a fourth connecting sub-part connected to each other. The fourth connecting sub-part is connected to the second bending part, and the third connecting sub-part is welded to the second electrode lug. The thickness of the third connecting sub-part is less than the thickness of the fourth connecting sub-part.

13. The battery cell of claim 12, wherein: The surface of the third connector facing the first end face is flush with the surface of the fourth connector facing the first end face.

14. The battery cell of any one of claims 11-13, wherein: The adapter assembly includes a first insulating member, which includes a first insulating portion connected between the third connecting portion and the fourth connecting portion.

15. The battery cell of claim 14, wherein: The first insulating member further includes a second insulating part connected to the first insulating part, and a first vacant position is formed on the side of the first connecting part opposite to the first bending part, and the second insulating part is located in the first vacant position; And / or, the first insulating member further includes a third insulating portion connected to the first insulating portion, wherein the third insulating portion forms a second vacant position on the side opposite to the second bending portion, and the third insulating portion is located in the second vacant position.

16. The battery cell of claim 14 or 15, wherein: The first insulating member further includes a fourth insulating portion, and the first connecting portion has a first notch on its side facing away from the third connecting portion. The fourth insulating portion is located at the first notch and is connected to the first connecting portion. And / or, the first insulating member further includes a fifth insulating portion, the third connecting portion having a second notch on its side opposite to the first connecting portion, the fifth insulating portion being located at the second notch and connected to the third connecting portion.

17. The battery cell of any one of claims 14-16, wherein: The first insulating member further includes a sixth insulating portion connected to the first insulating portion, and at least a portion of the surface of the first connecting portion facing away from the first end face is connected to the sixth insulating portion; And / or, at least a portion of the surface of the first connecting portion facing the first end face is connected to the sixth insulating portion.

18. The battery cell of claim 17, wherein: The first electrode tab is welded to the first connecting portion to form a first weld mark, and the sixth insulating portion has a first clearance groove to avoid the first weld mark.

19. The battery cell of any one of claims 14-18, wherein: The first insulating member further includes a seventh insulating portion connected to the first insulating portion, and at least a portion of the surface of the third connecting portion facing away from the first end face is connected to the seventh insulating portion; And / or, at least a portion of the surface of the third connecting portion facing the first end face is connected to the seventh insulating portion.

20. The battery cell of claim 19, wherein: The second electrode tab is welded to the third connecting part to form a second weld mark, and the seventh insulating part has a second clearance groove to avoid the second weld mark.

21. The battery cell of any one of claims 14-20, wherein: Along the direction perpendicular to the first end face, the projected area of ​​the first insulating element is S3, the area of ​​the first end face is S2, and 0.05≤S3 / S2≤0.

7.

22. The battery cell of any one of claims 14-21, wherein: Along the direction perpendicular to the first end face, the projected area of ​​the first insulating member, the first connecting part and the third connecting part is S4, the area of ​​the first end face is S2, and 0.8≤S4 / S2≤0.

95.

23. The battery cell of any one of claims 14-22, wherein: The outer casing has a liquid injection hole, and the first insulating part has a first through hole at the position corresponding to the liquid injection hole.

24. The battery cell of claim 23, wherein: The first through hole penetrates the side of the first insulating portion away from the first bend.

25. The battery cell of any one of claims 14-24, wherein: The electrode assembly has a central hole that penetrates through the first end face, and the first insulating part has a second through hole at a position corresponding to the central hole.

26. The battery cell of any one of claims 11-25, wherein: The adapter assembly further includes a second insulating member, which is connected between the second connecting portion and the fourth connecting portion.

27. The battery cell of any one of claims 11-26, wherein: The second electrode lead-out portion is riveted to the fourth connecting portion.

28. The battery cell of any one of claims 11-27, 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. The first electrode lead-out portion and the second electrode lead-out portion are located on the end cap.

29. The battery cell of any one of claims 1-28, wherein: The battery cell is a cylindrical battery cell or a prismatic battery cell.

30. A method of making a battery cell, wherein, include: The second connecting part of the first adapter is connected to the first electrode lead-out part on the end cap, and the fourth connecting part of the second adapter is connected to the second electrode lead-out part on the end cap. The first bent portion of the first adapter and the second bent portion of the second adapter are bent so that the first adapter and the second adapter form an angled structure. The first connecting part of the first adapter is connected to the first electrode tab, and the third connecting part of the second adapter is connected to the second electrode tab; wherein, the electrode assembly is located inside the housing, and the first end face of the electrode assembly has the first electrode tab and the second electrode tab leading out; Continue bending the first bent portion of the first adapter and the second bent portion of the second adapter so that the end cap covers the housing; The first adapter and the second adapter are spaced apart. After the first adapter is bent, it consists of a first connecting part, a second connecting part, and a first bent part. The first bent part connects the first connecting part and the second connecting part. The first connecting part is connected to the first electrode tab, and the second connecting part is connected to the first electrode lead-out part. The first connecting part and the second connecting part are stacked, with the first connecting part located between the second connecting part and the first end face. Along a stacking direction perpendicular to the first connecting part and the second connecting part, the first bent part is located on the same side of the first connecting part and the second connecting part, such that the first... An adapter forms a double-layer structure; after the second adapter is bent, the second adapter is divided into the third connecting part, the fourth connecting part, and the second bent part. The second bent part is connected between the third connecting part and the fourth connecting part. The third connecting part is connected to the second electrode tab, and the fourth connecting part is connected to the second electrode lead-out part. The third connecting part and the fourth connecting part are stacked, with the third connecting part located between the fourth connecting part and the first end face. Along the stacking direction perpendicular to the third connecting part and the fourth connecting part, the second bent part is located on the same side of the third connecting part and the fourth connecting part, so that the second adapter forms a double-layer structure.

31. A battery device, wherein, It includes multiple battery cells according to any one of claims 1 to 29 or multiple battery cells obtained by the battery cell manufacturing method according to claim 30.

32. An energy storage device, wherein, It includes multiple battery cells according to any one of claims 1 to 29, multiple battery cells obtained by the battery cell manufacturing method according to claim 30, or multiple battery devices according to claim 31, wherein the battery cells or the battery devices are used to store or provide electrical energy.

33. An energy storage system, wherein, It includes a power conversion device and an energy storage device as described in claim 32, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

34. An electrical device, comprising: The battery cell includes any one of claims 1 to 28, a battery cell obtained by the battery cell manufacturing method of claim 30, a battery device of claim 31, an energy storage device of claim 32, or an energy storage system of claim 33, wherein the battery cell or the battery device is used to store or provide electrical energy.

35. A charging network, wherein, It includes a charging pile and an energy storage device as described in claim 32 or an energy storage system as described in claim 33, wherein the energy storage device is used to provide electrical energy to the charging pile.

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