Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly and an electrode lead-out piece, the wall part of the shell is provided with an electrode lead-out hole. The electrode assembly is housed within the housing. The electrode lead-out piece is arranged in the electrode lead-out hole and is electrically connected with the electrode assembly. The wall part comprises a body part and a reinforcing part which are integrally formed, the reinforcing part is arranged on a first surface on one side of the body part in a protruding mode in the thickness direction of the wall part, the area, provided with the reinforcing part in a protruding mode, of the first surface is a first area of the wall part, and the electrode leading-out holes are formed in the first area so that the structural strength of the area, provided with the electrode leading-out holes, of the wall part can be enhanced. And the phenomenon of fatigue cracking or deformation collapse caused by pulling or external impact on the area of the wall part provided with the electrode lead-out holes in the use process can be relieved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. As a core component of new energy vehicles, battery devices have high requirements in terms of stability and reliability.

[0003] In battery technology, a battery cell typically includes a casing and an electrode assembly housed within the casing. To enable the input or output of electrical energy into the battery cell, the casing is usually provided with electrode leads for electrical connection with the electrode assembly. Correspondingly, the casing is provided with electrode lead holes, and the electrode leads are located in the electrode lead holes. However, the structural strength of the area of ​​the casing of existing battery cells where the electrode lead holes are located is low, making the casing prone to fatigue cracking or deformation and collapse during use, resulting in low stability and reliability of the battery cell. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device, which can effectively improve the stability and reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, and an electrode lead-out member; the housing has a wall portion, the wall portion being provided with an electrode lead-out hole, the electrode lead-out hole penetrating the wall portion along its thickness direction; the electrode assembly is accommodated within the housing portion; the electrode lead-out member is disposed in the electrode lead-out hole, and the electrode lead-out member is electrically connected to the electrode assembly; wherein, the wall portion includes an integrally formed body portion and a reinforcing portion, the reinforcing portion protruding from a first surface on one side of the body portion along the thickness direction of the wall portion, the area on the first surface where the reinforcing portion protrudes is a first region of the wall portion, and the electrode lead-out hole is disposed in the first region.

[0006] In the above technical solution, an electrode lead-out hole is provided on the wall portion, and the electrode lead-out hole penetrates the wall portion along the thickness direction, so that the electrode lead-out hole can be assembled with the electrode lead-out component of the battery cell to realize the input or output of electrical energy of the battery cell. The wall portion includes a body portion and a reinforcing portion protruding from the first surface of the body portion, and the reinforcing portion and the body portion are integrally formed. By setting the electrode lead-out hole in the first region of the wall portion, the electrode lead-out hole is a structure that penetrates the first region of the wall portion with the reinforcing portion in the thickness direction of the wall portion, thereby strengthening the structural strength of the region of the wall portion with the electrode lead-out hole. The battery cell with this structure can effectively improve the structural strength of the region of the wall portion with the electrode lead-out hole while realizing the assembly of the battery cell, thereby effectively mitigating the phenomenon of fatigue cracking or deformation collapse when the region of the wall portion with the electrode lead-out hole is subjected to tension or external impact during use, reducing the risk of battery cell explosion damage during use, and improving the stability and reliability of the battery cell.

[0007] In some embodiments, the reinforcing portion includes a first reinforcing portion having a main body region, and the electrode lead-out hole is disposed in the main body region; wherein the main body region is disposed around the electrode lead-out hole.

[0008] In the above technical solution, the electrode lead-out hole is located in the main body area of ​​the first reinforcing part, and the main body area is a structure surrounding the electrode lead-out hole. This allows the main body area to provide overall reinforcement to the wall around the area where the electrode lead-out hole is located, thereby further improving the reinforcement effect of the reinforcing part on the area of ​​the wall where the electrode lead-out hole is located. This further alleviates the phenomenon of fatigue cracking or deformation and collapse when the area of ​​the wall where the electrode lead-out hole is located is subjected to tension or external impact during use.

[0009] In some embodiments, in a projection plane perpendicular to the thickness direction of the wall portion, the geometric center of the orthographic projection of the main body region coincides with the geometric center of the orthographic projection of the hole wall of the electrode lead-out hole.

[0010] In the above technical solution, by setting the geometric center of the orthographic projection of the main body area in the thickness direction perpendicular to the wall portion to coincide with the geometric center of the orthographic projection of the hole wall surface of the electrode lead-out hole in the thickness direction perpendicular to the wall portion, the main body area and the electrode lead-out hole are coaxially arranged. This improves the shape regularity of the main body area and the electrode lead-out hole, which helps to reduce the processing difficulty of the wall portion. Furthermore, it ensures that the area around the electrode lead-out hole on the wall portion is reinforced by the main body area with the same width, which further enhances the overall reinforcement effect of the main body area on the wall portion around the area where the electrode lead-out hole is located.

[0011] In some embodiments, along the thickness direction of the wall portion, the thickness of the main body region protruding from the first surface is T1, satisfying 0.2mm≤T1≤2mm.

[0012] In the above technical solution, by setting the size of the main body region protruding from the first surface in the thickness direction of the wall to 0.2mm to 2mm, the thickness of the main body region in the thickness direction of the wall is 0.2mm to 2mm. On the one hand, setting the thickness of the main body region to be greater than or equal to 0.2mm can improve the structural strength of the main body region itself, so that the main body region has sufficient thickness and strength to strengthen the area where the electrode lead-out hole is set in the wall, which is beneficial to improving the structural strength of the area where the electrode lead-out hole is set in the wall. On the other hand, setting the thickness of the main body region to be less than or equal to 2mm can reduce the height of the main body region protruding from the first surface, thereby reducing the space occupied by the main body region in the thickness direction of the wall, and facilitating the assembly of the electrode lead-out component at the electrode lead-out hole, which is beneficial to reducing the assembly difficulty of the electrode lead-out component.

[0013] In some embodiments, the wall portion is provided with two electrode lead-out holes, and the battery cell includes two electrode leads with opposite polarities, each electrode lead being correspondingly disposed in one electrode lead-out hole, and both electrode leads being electrically connected to the electrode assembly; wherein, the reinforcing portion includes a plurality of first reinforcing portions arranged at intervals along a first direction, each electrode lead-out hole being disposed in one of the first reinforcing portions, and the first direction being perpendicular to the thickness direction of the wall portion.

[0014] In the above technical solution, by setting the reinforcing part to include a plurality of first reinforcing parts arranged at intervals along the first direction, and each electrode lead-out hole corresponding to a first reinforcing part, it is convenient to strengthen the area of ​​the wall with electrode lead-out holes at different positions, which is beneficial to improve the strengthening effect of the area of ​​the wall with electrode lead-out holes and reduce the molding difficulty of the wall. On the other hand, it can reduce the stress influence between the areas of the wall with electrode lead-out holes at different positions, which is beneficial to reduce the risk of tearing or cracking of the wall at the electrode lead-out holes.

[0015] In some embodiments, the wall portion is further provided with a liquid injection hole, which penetrates the wall portion along the thickness direction. The liquid injection hole is located in the first region, and the liquid injection hole and the two electrode lead-out holes are respectively located in different first reinforcing portions; wherein, along the first direction, the first reinforcing portion provided with the liquid injection hole is located between the two first reinforcing portions provided with the electrode lead-out holes.

[0016] In the above technical solution, the wall portion is provided with a liquid injection hole and two electrode lead-out holes. The liquid injection hole is also provided in the first region of the wall portion, and the liquid injection hole and the two electrode lead-out holes are respectively provided in three first reinforcing parts. By setting the first reinforcing part with the liquid injection hole in the first direction to be located between the two first reinforcing parts with the electrode lead-out holes, on the one hand, the layout of the area on the wall portion where the liquid injection hole and the two electrode lead-out holes are provided can be optimized, which is beneficial to improving the regularity of the battery cell. On the other hand, the stress influence between the areas on the wall portion where the liquid injection hole and the two electrode lead-out holes are provided can be reduced, which is beneficial to improving the stability of the battery cell in use.

[0017] In some embodiments, the housing includes a housing and an end cap; the housing has an internal cavity, and the housing has an opening at one end of the wall portion in the thickness direction, the opening communicating with the cavity, and at least a portion of the electrode assembly is accommodated within the cavity; the end cap closes to the opening and is connected to the housing; wherein the wall portion is the end cap.

[0018] In the above technical solution, by setting the wall portion as an end cap for the outer shell to cover the opening, it is easy to form the wall portion into a body portion and a reinforcing portion, and it is easy to process electrode lead-out holes and assemble electrode lead-out parts on the wall portion, which helps to reduce the molding difficulty of the wall portion and the assembly difficulty of the battery cell, thereby reducing the manufacturing difficulty of the battery cell.

[0019] In some embodiments, at least a portion of the body portion is inserted into the receiving cavity from the opening along the thickness direction of the wall portion, the outer peripheral surface of the body portion abuts against the inner peripheral surface of the housing, and the body portion is welded to the housing.

[0020] In the above technical solution, by setting the main body to be inserted into the receiving cavity of the housing from the opening of the housing, and the outer peripheral surface of the main body abutting and welding the inner peripheral surface of the housing, the assembly difficulty between the housing and the end cap can be reduced and the assembly accuracy between the housing and the end cap can be improved. On the other hand, the connection stability and reliability between the end cap and the housing can be improved, which helps to reduce the phenomenon of connection failure between the end cap and the housing during use, thereby reducing the risk of leakage of the battery cell during use.

[0021] In some embodiments, the reinforcing portion includes a second reinforcing portion extending circumferentially along the body portion, the outer peripheral surface of the second reinforcing portion being flush with the outer peripheral surface of the body portion; wherein the outer peripheral surface of the second reinforcing portion abuts against the inner peripheral surface of the housing, and the second reinforcing portion is welded to the housing.

[0022] In the above technical solution, the reinforcing part also includes a second reinforcing part disposed on the first surface of the body part. By setting the second reinforcing part as a structure extending circumferentially along the body part, and the outer peripheral surface of the second reinforcing part being flush with the outer peripheral surface of the body part, both the outer peripheral surface of the second reinforcing part and the outer peripheral surface of the body part can abut against the inner peripheral surface of the housing, thereby increasing the contact area and welding area between the end cap and the housing, further improving the connection stability and reliability between the end cap and the housing, which is conducive to further reducing the phenomenon of connection failure between the end cap and the housing during use, and thus further reducing the leakage risk of the battery cell during use.

[0023] In some embodiments, the second reinforcing portion is an annular structure extending circumferentially along the body portion.

[0024] In the above technical solution, by setting the second reinforcing part as an annular structure extending circumferentially along the body part, the outer peripheral surface of the second reinforcing part can abut against the inner peripheral surface of the shell in the entire circumferential direction of the body part, thereby further increasing the contact area and welding area between the end cover and the shell, so as to further improve the connection stability and reliability between the end cover and the shell.

[0025] In some embodiments, the minimum distance between the outer peripheral surface of the second reinforcing part and the inner peripheral surface of the second reinforcing part is L1, which satisfies 1mm≤L1≤5mm.

[0026] In the above technical solution, by setting the minimum distance between the outer peripheral surface of the second reinforcing part and the inner peripheral surface of the second reinforcing part to 1mm to 5mm, the minimum thickness of the area where the second reinforcing part is welded to the shell in the radial direction of the main body is 1mm to 5mm. On the one hand, this can increase the thickness of the part where the second reinforcing part is welded to the shell, which is beneficial to improve the weld penetration between the end cap and the shell, thereby improving the welding stability and welding quality between the end cap and the shell. On the other hand, it can alleviate the problem of the second reinforcing part occupying too much space on the first surface, thereby reducing the limitation of the area where the electrode lead-out hole and the first reinforcing part are set in the main body, and can also reduce the interference between the second reinforcing part and the electrode lead-out part, thereby reducing the manufacturing difficulty of the battery cell.

[0027] In some embodiments, 1.5mm ≤ L1 ≤ 4mm.

[0028] In the above technical solution, by further setting the minimum distance between the outer peripheral surface of the second reinforcing part and the inner peripheral surface of the second reinforcing part to 1.5mm to 4mm, the minimum thickness of the area where the second reinforcing part is welded to the shell in the radial direction of the main body is 1.5mm to 4mm. On the one hand, this can further increase the thickness of the part where the second reinforcing part is welded to the shell, which is beneficial to further improve the weld penetration between the end cap and the shell, thereby further improving the welding stability and welding quality between the end cap and the shell. On the other hand, it can further alleviate the problem of the second reinforcing part occupying too much space on the first surface, thereby further reducing the phenomenon of limited area for setting electrode lead holes and the first reinforcing part in the main body, and further reducing the interference between the second reinforcing part and the electrode lead, thereby further reducing the manufacturing difficulty of the battery cell.

[0029] In some embodiments, the wall portion further includes an edge portion; the edge portion protrudes from the outer peripheral surface of the body portion, and the edge portion abuts against the end of the housing where the opening is provided along the thickness direction of the wall portion.

[0030] In the above technical solution, the wall portion also has an edge portion. By setting the edge portion to be protruding on the outer peripheral surface of the main body portion and abutting against the end of the shell with an opening along the thickness direction of the wall portion, the main body portion and the shell are welded together and the opening is closed. At the same time, the edge portion can also play a certain limiting and positioning role on the main body portion, thereby reducing the assembly difficulty between the end cover and the shell and improving the assembly quality between the end cover and the shell.

[0031] In some embodiments, the edge portion is an annular structure extending circumferentially along the body portion.

[0032] In the above technical solution, by setting the edge portion as a ring structure surrounding the outer side of the body portion, the effect of the edge portion in limiting and positioning the body portion can be further improved. On the one hand, it can further reduce the assembly difficulty between the end cap and the housing, and further improve the assembly quality between the end cap and the housing. On the other hand, it can also improve the sealing effect of the end cap on the opening of the housing, so as to reduce the risk of leakage of the battery cell during use.

[0033] In some embodiments, the reinforcing portion includes a first reinforcing portion and a second reinforcing portion, the electrode lead-out hole is disposed on the first reinforcing portion, the second reinforcing portion is disposed around the first reinforcing portion, and the inner peripheral surface of the second reinforcing portion and the first surface together define a first groove, the first reinforcing portion being located within the first groove.

[0034] In the above technical solution, the reinforcing part includes a first reinforcing part and a second reinforcing part protruding from the first surface. The second reinforcing part is arranged around the first reinforcing part, and the inner peripheral surface of the second reinforcing part and the first surface together define a first groove, so that the first reinforcing part is a structure disposed on the bottom surface of the first groove. The electrode lead-out hole is disposed corresponding to the first reinforcing part, so that the electrode lead-out hole is a structure that passes through the first surface and the first reinforcing part in sequence. The wall part with this structure can realize that the first reinforcing part is located on the inner peripheral side of the second reinforcing part, so that the second reinforcing part can play a certain protective role for the first reinforcing part, which is conducive to reducing the impact and wear of the first reinforcing part, thereby improving the stability and reliability of the first reinforcing part in reinforcing the area of ​​the wall part where the electrode lead-out hole is disposed.

[0035] In some embodiments, the first reinforcing portion is connected to the groove side of the first groove.

[0036] In the above technical solution, by setting the first reinforcing part to be connected to the groove side of the first groove, the first reinforcing part and the second reinforcing part of the reinforcing part are connected to form a whole, which is beneficial to improve the overall structural strength of the reinforcing part, thereby improving the overall structural strength of the wall part, further strengthening the structural strength of the area where the electrode lead-out hole is provided in the wall part, and further mitigating the phenomenon of fatigue cracking or deformation collapse when the area where the electrode lead-out hole is provided in the wall part is subjected to tension or external impact during use, so as to further reduce the risk of battery cell bursting and damage during use.

[0037] In some embodiments, there are multiple first reinforcing portions, and the multiple first reinforcing portions are arranged at intervals along a first direction in the first groove, and each electrode lead-out hole is correspondingly disposed on one of the first reinforcing portions; wherein, the groove side of the first groove includes a first side and a second side disposed opposite to each other in a second direction, the first side and the second side are both connected to the first reinforcing portion, and the thickness direction of the wall portion, the first direction and the second direction are perpendicular to each other.

[0038] In the above technical solution, the reinforcing part is provided with a plurality of first reinforcing parts arranged at intervals in the first groove along the first direction, and the first reinforcing parts are connected to the first side and the second side opposite to each other in the second direction of the first groove, so as to further improve the overall structural strength of the reinforcing part, thereby further improving the structural strength of the area where the electrode lead-out hole is provided on the wall, so as to alleviate the phenomenon of fatigue cracking or deformation and collapse when the area where the electrode lead-out hole is provided on the wall is subjected to external impact or expansion of the battery cell during use.

[0039] In some embodiments, the first reinforcing portion includes a main body region and a plurality of connecting ribs, the electrode lead-out hole is disposed in the main body region, and the plurality of connecting ribs are arranged at intervals along the circumference of the main body region; wherein, the first side and the second side are both connected to the main body region through at least one of the connecting ribs.

[0040] In the above technical solution, the first reinforcing part is provided with a main body area and a plurality of connecting ribs arranged around the main body area. The electrode lead-out hole is provided on the main body area, and the first side and the second side are both connected to the main body area through at least one connecting rib, so as to realize that the first reinforcing part connects the first side and the second side opposite to the first groove in the second direction. The first reinforcing part with this structure can further improve the overall structural strength of the reinforcing part, which is conducive to further improving the reinforcing effect of the reinforcing part on the structural strength of the area where the electrode lead-out hole is provided on the wall.

[0041] In some embodiments, the width of the connecting rib is W1, satisfying 0.5mm≤W1≤3mm.

[0042] In the above technical solution, the width of the connecting rib is 0.5mm to 3mm. On the one hand, setting the width of the connecting rib to be greater than or equal to 0.5mm is beneficial to further enhance the strengthening effect of the connecting rib on the overall structural strength of the wall, so as to alleviate the phenomenon of fatigue cracking or deformation and collapse in the area of ​​the wall where the electrode lead-out hole is provided during use. On the other hand, setting the width of the connecting rib to be less than or equal to 3mm saves the space occupied by the connecting rib and reduces the forming difficulty of the connecting rib.

[0043] In some embodiments, the reinforcing portion further includes a plurality of third reinforcing portions spaced apart along the first direction, the third reinforcing portions being located within the first groove, and the second reinforcing portion extending along the second direction; wherein, along the first direction, the first reinforcing portion and the third reinforcing portion are alternately arranged, and every two adjacent third reinforcing portions are connected through the first reinforcing portion.

[0044] In the above technical solution, the reinforcing part is further provided with a plurality of third reinforcing parts arranged at intervals in the first groove along the first direction, and the third reinforcing parts extend along the second direction. By setting the first reinforcing parts and the third reinforcing parts to be arranged alternately in the first direction, and each pair of adjacent third reinforcing parts being connected through the first reinforcing parts, it is possible to connect the plurality of first reinforcing parts of the reinforcing part into a whole, which is beneficial to further improve the strengthening effect of the structural strength of the wall part. In this way, it can further alleviate the phenomenon of fatigue cracking or deformation collapse in the area of ​​the wall part where the electrode lead-out holes are provided during use when subjected to external impact or expansion of the battery cell, so as to further reduce the risk of battery cell bursting and damage during use.

[0045] In some embodiments, the first reinforcing portion includes a main body region and a plurality of connecting ribs, the electrode lead-out hole is disposed in the main body region, and the plurality of connecting ribs are arranged at intervals along the circumference of the main body region; wherein, along the first direction, each pair of adjacent third reinforcing portions is connected to the main body region through at least one connecting rib.

[0046] In the above technical solution, the first reinforcing part is provided with a main body area and a plurality of connecting ribs arranged around the main body area. The electrode lead-out hole is provided on the main body area, and the two adjacent third reinforcing parts are connected to the main body area through at least one connecting rib, so as to realize that the first reinforcing part is connected to the two adjacent third reinforcing parts in the first direction. The first reinforcing part with this structure can further improve the overall structural strength of the reinforcing part, which is conducive to further improving the structural strength of the area where the electrode lead-out hole is provided on the wall.

[0047] In some embodiments, along the second direction, the two ends of the third reinforcing portion are respectively connected to the first side and the second side.

[0048] In the above technical solution, by connecting the two ends of the third reinforcing part in the second direction to the first side and the second side of the first groove respectively, the reinforcing effect of the third reinforcing part on the overall structural strength of the wall can be improved, and the stability and reliability of the third reinforcing part protruding on the first surface of the body can be improved.

[0049] In some embodiments, along the first direction, the width of the third reinforcing part is W2, satisfying 0.5mm≤W2≤3mm.

[0050] In the above technical solution, the width of the third reinforcing part in the first direction is 0.5mm to 3mm. On the one hand, setting the width of the third reinforcing part in the first direction to be greater than or equal to 0.5mm is beneficial to further enhance the reinforcing effect of the third reinforcing part on the overall structural strength of the wall, so as to alleviate the phenomenon of fatigue cracking or deformation damage of the wall during use. On the other hand, setting the width of the third reinforcing part in the first direction to be less than or equal to 3mm saves the space occupied by the third reinforcing part in the first direction and can reduce the molding difficulty of the third reinforcing part.

[0051] In some embodiments, the groove side of the first groove further includes a third side and a fourth side disposed opposite to each other in the first direction, and a plurality of third reinforcing portions are located between the third side and the fourth side in the first direction; wherein, the reinforcing portion further includes a plurality of fourth reinforcing portions, the fourth reinforcing portions are located in the first groove, the fourth reinforcing portions extend along the first direction, and along the first direction, the third reinforcing portion closest to the third side among the plurality of third reinforcing portions is connected to the third side through at least one fourth reinforcing portion, and the third reinforcing portion closest to the fourth side among the plurality of third reinforcing portions is connected to the fourth side through at least one fourth reinforcing portion.

[0052] In the above technical solution, the reinforcing part is further provided with multiple fourth reinforcing parts. By setting the third reinforcing part closest to the third side among the multiple third reinforcing parts spaced apart along the first direction to be connected to the third side through at least one fourth reinforcing part, and setting the third reinforcing part closest to the fourth side among the multiple third reinforcing parts spaced apart along the first direction to be connected to the fourth side through at least one fourth reinforcing part, it is possible to achieve the connection between the two third reinforcing parts located on both sides in the first direction and the second reinforcing part to form a whole. This is beneficial to further enhance the structural strength of the wall, so as to further alleviate the phenomenon of fatigue cracking or deformation damage when the wall is subjected to external impact or expansion of the battery cell during use. In this way, it can further reduce the risk of battery cell bursting damage during use, so as to further improve the stability and reliability of the battery cell.

[0053] In some embodiments, along the second direction, the width of the fourth reinforcing portion is W3, satisfying 0.5mm≤W3≤3mm.

[0054] In the above technical solution, the width of the fourth reinforcing part in the second direction is 0.5mm to 3mm. On the one hand, setting the width of the fourth reinforcing part in the second direction to be greater than or equal to 0.5mm is beneficial to further improve the overall structural strength of the reinforcing part, so as to further improve the strengthening effect on the structural strength of the wall. On the other hand, setting the width of the fourth reinforcing part in the second direction to be less than or equal to 3mm saves the space occupied by the fourth reinforcing part in the second direction and can reduce the molding difficulty of the fourth reinforcing part.

[0055] In some embodiments, in a projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the wall portion is rectangular, and the size of the orthographic projection of the wall portion in the first direction is greater than the size of the orthographic projection of the wall portion in the second direction.

[0056] In the above technical solution, by setting the projection of the wall portion in the thickness direction of the wall portion as a rectangular structure, and the length direction of the wall portion is the arrangement direction of multiple first reinforcing portions, the battery cell with this structure can reduce the difficulty of protruding multiple first reinforcing portions arranged at intervals along the first direction on the first surface, and can improve the strengthening effect of multiple first reinforcing portions on the overall structural strength of the wall portion.

[0057] In some embodiments, along the thickness direction of the wall portion, the thickness of the first reinforcing portion protruding from the first surface is T2, and the thickness of the second reinforcing portion protruding from the first surface is T3, satisfying that T2 < T3.

[0058] In the above technical solution, by setting the thickness of the first reinforcing part to be less than the thickness of the second reinforcing part, the first reinforcing part is a structure that does not exceed the thickness of the second reinforcing part in the wall thickness direction, that is, the first reinforcing part does not exceed the first groove in the wall thickness direction, so that the first reinforcing part is a structure that is entirely accommodated in the first groove. This can reduce the interference between the first reinforcing part with the electrode lead-out hole and other components inside the battery cell, and facilitate the assembly of electrode lead-out parts at the electrode lead-out hole, which helps to reduce the assembly difficulty of the electrode lead-out parts. In addition, the first groove can also play a certain protective role for the first reinforcing part, so as to reduce the wear of the first reinforcing part during use.

[0059] In some embodiments, T2 ≥ 0.15T3.

[0060] In the above technical solution, by setting the thickness of the first reinforcing part to be greater than or equal to 0.15 times the thickness of the second reinforcing part, it is beneficial to improve the structural strength of the first reinforcing part itself, so that the first reinforcing part has sufficient thickness and strength to strengthen the area where the electrode lead-out hole is provided on the wall, thereby effectively improving the strengthening effect on the structural strength of the area where the electrode lead-out hole is provided on the wall.

[0061] In some embodiments, 0.2mm ≤ T2 ≤ 2mm.

[0062] In the above technical solution, by setting the size of the first reinforcing part protruding from the first surface in the thickness direction of the wall to 0.2mm to 2mm, the thickness of the first reinforcing part in the thickness direction of the wall is 0.2mm to 2mm. On the one hand, setting the thickness of the first reinforcing part to be greater than or equal to 0.2mm can improve the structural strength of the first reinforcing part itself, so that the first reinforcing part has sufficient thickness and strength to strengthen the area of ​​the wall where the electrode lead-out hole is provided, which is beneficial to improving the structural strength of the area of ​​the wall where the electrode lead-out hole is provided. On the other hand, setting the thickness of the first reinforcing part to be less than or equal to 2mm can reduce the height of the first reinforcing part protruding from the first surface, thereby reducing the space occupied by the first reinforcing part in the thickness direction of the wall, and facilitating the assembly of the electrode lead-out component at the electrode lead-out hole, which is beneficial to reducing the assembly difficulty of the electrode lead-out component.

[0063] In some embodiments, 0.2mm ≤ T3 ≤ 3mm.

[0064] In the above technical solution, by setting the size of the second reinforcing part protruding from the first surface in the thickness direction of the wall to 0.2mm to 3mm, the thickness of the second reinforcing part in the thickness direction of the wall is 0.2mm to 3mm. On the one hand, setting the thickness of the second reinforcing part to be greater than or equal to 0.2mm can improve the structural strength of the second reinforcing part itself, thereby enhancing the reinforcing effect of the second reinforcing part on the overall structural strength of the wall, which is beneficial to reducing the risk of cracking or deformation and collapse of the wall during use. On the other hand, setting the thickness of the second reinforcing part to be less than or equal to 3mm can reduce the height of the second reinforcing part protruding from the first surface, thereby reducing the space occupied by the second reinforcing part in the thickness direction of the wall, and reducing the interference between the second reinforcing part and other components.

[0065] In some embodiments, along the thickness direction of the wall portion, the side of the body portion away from the reinforcing portion further has a second surface, the distance between the second surface and the first surface is D, and the thickness of the second reinforcing portion protruding from the first surface is T3, satisfying 0.05≤T3 / (T3+D)≤0.875.

[0066] In the above technical solution, by setting the thickness of the second reinforcing part to be 0.05 to 0.875 times the sum of the distance between the first surface and the second surface and the thickness of the second reinforcing part, the thickness of the second reinforcing part accounts for 0.05 to 0.875 times the total wall thickness of the wall part. On the one hand, the second reinforcing part enhances the overall structural strength of the wall part, thereby improving the overall structural strength of the wall part. On the other hand, it can alleviate the phenomenon that the structural strength of the main body of the wall part is weak due to the excessive space occupied by the second reinforcing part. This is conducive to improving the structural strength of the main body of the wall part, thereby reducing the risk of deformation or cracking of the main body during use.

[0067] In some embodiments, 1mm ≤ D ≤ 4mm.

[0068] In the above technical solution, by setting the distance between the first surface and the second surface to 1mm to 4mm, the wall thickness of the main body of the wall is 1mm to 4mm. On the one hand, it can improve the structural strength of the main body and the overall structural strength of the wall, thereby reducing the risk of deformation or cracking of the main body of the wall during use. On the other hand, it can save the space occupied by the wall and reduce the overall weight of the wall.

[0069] In some embodiments, the first surface is disposed facing the electrode assembly along the thickness direction of the wall portion.

[0070] In the above technical solution, the first surface is the surface of the body facing the electrode assembly, so that the reinforcing part is a structure protruding on the side of the body facing the electrode assembly. The battery cell with this structure can reduce the accumulation of external impurities in the first groove formed by the second reinforcing part, and can realize that the reinforcing part is located inside the shell, which is beneficial to reduce the wear of the reinforcing part during use. On the other hand, it can realize that the first groove formed by the second reinforcing part is connected to the internal space of the shell, thereby effectively utilizing the space in the first groove and improving the space utilization rate of the battery cell.

[0071] In some embodiments, the electrode lead-out includes a first connecting portion, the electrode assembly includes a main body and a tab, the tab is connected to one end of the main body facing the wall in the thickness direction of the wall, and the tab is electrically connected to the first connecting portion; the battery cell further includes a first insulating member, the first insulating member is disposed within the housing, and at least a portion of the first insulating member is located between the wall and the first connecting portion; wherein, along the thickness direction of the wall, the first insulating member has a third surface facing away from the wall and a fourth surface facing the wall, the third surface is provided with a second groove, the fourth surface is formed with a first protrusion corresponding to the position of the second groove, at least a portion of the first protrusion is accommodated in the first groove, and at least a portion of the first connecting portion and at least a portion of the tab are both accommodated in the second groove.

[0072] In the above technical solution, a second groove is provided on the third surface of the first insulating member away from the wall portion, and a first protrusion is provided on the fourth surface of the first insulating member facing the wall portion and corresponding to the position of the second groove. By setting at least a portion of the first protrusion to be accommodated in the first groove, and setting at least a portion of the first connecting portion and at least a portion of the electrode tab to be accommodated in the second groove, the structure can achieve the effect of insulating and isolating the electrode tab and the wall portion, as well as the effect of the first insulating member to insulate and isolate the first insulating member from the wall portion and the first connecting portion and the wall portion, while also realizing that the first insulating member and the second reinforcing portion share a portion of space in the thickness direction of the wall portion. Furthermore, while ensuring that there is sufficient space between the first insulating member and the main body portion to accommodate the first connecting portion and the electrode tab, the structure can also realize that the first insulating member and the first connecting portion, as well as the first insulating member and the electrode tab, share a portion of space in the thickness direction of the wall portion. This reduces the phenomenon of the first insulating member pressing down on the electrode tab and satisfies the insulation and isolation effect between the electrode tab and the wall portion, while effectively increasing the internal space of the battery cell for accommodating the electrode assembly. This is beneficial to improving the internal space utilization rate of the battery cell and thus improving the volumetric energy density of the battery cell.

[0073] In some embodiments, a limiting portion is provided on the bottom surface of the second groove, and the limiting portion surrounds the outer periphery of the first connecting portion.

[0074] In the above technical solution, by providing a limiting part protruding from the bottom surface of the second groove, and the limiting part being a structure surrounding the first connecting part, the limiting part can play a certain limiting and positioning role for the first connecting part. On the one hand, it can reduce the shaking phenomenon of the first connecting part during use, which is conducive to improving the stability of the first connecting part in the second groove. On the other hand, it can reduce the difficulty of assembling at least part of the first connecting part into the second groove, thereby reducing the assembly difficulty between the first insulating part and the electrode lead-out part, which is conducive to improving the assembly efficiency of the battery cell.

[0075] In some embodiments, the limiting portion is an annular structure extending circumferentially along the first connecting portion.

[0076] In the above technical solution, by setting the limiting part as a ring structure surrounding the first connecting part, the effect of the limiting part in limiting and positioning the first connecting part can be further improved, and the difficulty of protruding the limiting part on the bottom surface of the second groove can be reduced.

[0077] In some embodiments, the limiting portion is configured to divide the second groove into a first groove and a second groove, the first groove being located inside the limiting portion and the second groove being located outside the limiting portion, and the second groove being disposed around the first groove; wherein at least a portion of the first connecting portion is accommodated in the first groove and at least a portion of the electrode tab is accommodated in the second groove.

[0078] In the above technical solution, the limiting part divides the second groove into a first groove located inside the limiting part and a second groove located outside the limiting part, so that the second groove is a structure surrounding the outside of the first groove, and at least a portion of the first connecting part and at least a portion of the electrode tab are respectively accommodated in the first groove and the second groove, so that the first groove for accommodating the first connecting part and the second groove for accommodating the electrode tab in the second groove are independent structures. The battery cell with this structure can reduce the interference between the first connecting part and the electrode tab, and facilitate the assembly of at least a portion of the first connecting part and at least a portion of the electrode tab into the second groove, which helps to reduce the assembly difficulty between the electrode lead and the first insulating part and the electrode assembly and the first insulating part, thereby improving the assembly efficiency of the battery cell.

[0079] In some embodiments, the tab includes a connecting region and a bending region; the connecting region is located on the side of the first connecting portion away from the wall portion in the thickness direction of the wall portion and is connected to the first connecting portion; the bending region connects the connecting region and the main body portion; wherein, along the thickness direction of the wall portion, at least a portion of the bending region is accommodated within the second groove.

[0080] In the above technical solution, the electrode tab has a connection area located on the side of the first connecting portion away from the wall portion in the thickness direction of the wall portion and connected to the first connecting portion. The electrode tab also has a bending area connecting the connection area and the main body portion to realize the electrical connection between the electrode assembly and the electrode lead-out member. By setting at least a portion of the bending area of ​​the electrode tab to be accommodated in the second groove along the thickness direction of the wall portion, while realizing that the electrode tab and the first insulating member share a portion of space in the thickness direction of the wall portion, it is also possible to realize that there is sufficient space between the first insulating member and the main body portion to accommodate the bending area. On the one hand, it is convenient to bend the electrode tab to realize the connection area of ​​the electrode tab to be connected to the first connecting portion, which helps to reduce the difficulty of bending the electrode tab and the assembly difficulty between the electrode tab and the first connecting portion. On the other hand, it can alleviate the phenomenon of the first insulating member pressing down on the bending area of ​​the electrode tab, which helps to reduce the risk of damage to the bending area of ​​the electrode tab.

[0081] In some embodiments, the bending area is bent to form a plurality of bending segments, which are connected sequentially, and the bending segments located at both ends of the plurality of bending segments are respectively connected to the connecting area and the main body.

[0082] In the above technical solution, the bending area of ​​the electrode tab is set as a structure of multiple bending segments connected in sequence, and the bending segments at both ends of the multiple bending segments are connected to the connecting area and the main body respectively, so as to realize the bending structure of the electrode tab. The battery cell with this structure can reduce the difficulty of forming the bending area of ​​the electrode tab, so as to realize that the electrode tab has a connecting area on the side of the first connecting part away from the wall in the thickness direction of the wall. On the other hand, the bending area can play a certain buffering role between the connecting area and the main body, which helps to reduce the phenomenon of rigid tension between the connecting area and the main body.

[0083] In some embodiments, the wall portion is provided with two electrode lead-out holes, which are arranged at intervals along a first direction. The battery cell further includes two electrode leads, each electrode lead being correspondingly disposed in one of the electrode lead-out holes. The electrode assembly includes two tabs of opposite polarity, both tabs being connected to one end of the main body portion facing the wall portion in the thickness direction. The two tabs are arranged at intervals along the first direction, and each tab is connected to the first connecting portion of one of the electrode leads. The bending area and the first connecting portion are arranged along a second direction, and the thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other.

[0084] In the above technical solution, the wall is provided with two electrode lead-out holes arranged at intervals along a first direction, and the battery cell is also provided with two electrode lead-out members arranged at intervals along the first direction. Each electrode lead-out member is correspondingly provided with one electrode lead-out hole, and the electrode assembly is correspondingly provided with two tabs arranged at intervals along the first direction. The two tabs are respectively connected to the two electrode lead-out members to realize the input or output of electrical energy of the battery cell. In this way, by setting the bending area of ​​the tab and the first connecting part of the electrode lead-out member to be arranged in a structure along a second direction, the arrangement direction of the bending area and the first connecting part is perpendicular to the arrangement direction of the two tabs. This facilitates the bending of the tabs to form a bending section and reduces the assembly difficulty between the tabs and the first connecting part. On the other hand, it optimizes the internal space arrangement of the battery cell, which is beneficial to improve the internal space utilization of the battery cell and reduces the interference between the bending areas of the two tabs.

[0085] In some embodiments, the first protrusion abuts against the first reinforcement along the thickness direction of the wall portion.

[0086] In the above technical solution, by setting the first protrusion on the fourth surface of the first insulating member to abut against the first reinforcing part on the first surface along the thickness direction of the wall, the assembly compactness between the wall and the first insulating member can be improved, which helps to alleviate the phenomenon of wasted internal space of the battery cell. On the other hand, the assembly stability between the wall and the first insulating member can be improved, so as to reduce the phenomenon of shaking or displacement of the first insulating member inside the shell.

[0087] In some embodiments, the third surface is provided with a second protrusion, which abuts against the main body along the thickness direction of the wall portion.

[0088] In the above technical solution, by providing a second protrusion on the third surface of the first insulating member where the second groove is provided, and the second protrusion having a structure that abuts against the main body of the electrode assembly in the thickness direction of the wall portion, the first insulating member and the main body of the electrode assembly can also play a role in mutual positioning and stabilization, thereby improving the stability of the first insulating member between the main body and the wall portion, and improving the stability of the electrode assembly inside the housing, which helps to reduce the risk of shaking or displacement of the first insulating member and the electrode assembly during use.

[0089] In some embodiments, the electrode lead-out member further includes a lead-out portion and a second connecting portion. Along the thickness direction of the wall portion, the lead-out portion is located on the side of the wall portion away from the electrode assembly. The second connecting portion passes through the electrode lead-out hole and connects the lead-out portion and the first connecting portion. The bottom surface of the second groove is provided with a mounting hole. Along the thickness direction of the wall portion, the mounting hole is correspondingly provided with the electrode lead-out hole, and the second connecting portion passes through the mounting hole.

[0090] In the above technical solution, by setting electrode lead-out holes on the wall and setting mounting holes corresponding to the electrode lead-out holes on the bottom surface of the second groove of the first insulating member, the second connecting part of the electrode lead-out member can pass through the electrode lead-out holes and mounting holes in sequence along the thickness direction of the wall and connect the lead-out part and the first connecting part. This enables the electrode lead-out member to be electrically connected to the electrode assembly and to input or output the electrical energy of the battery cell through the electrode lead-out member. The structure is simple and can reduce the assembly difficulty of the first insulating member and the assembly difficulty between the electrode lead-out member and the tab, which is beneficial to improving the assembly efficiency of the battery cell.

[0091] In some embodiments, the electrode lead-out member includes a first connecting portion, a lead-out portion, and a second connecting portion; the first connecting portion is located on the side of the wall portion facing the electrode assembly and is electrically connected to the electrode assembly; the lead-out portion is located on the side of the wall portion away from the electrode assembly; the second connecting portion passes through the electrode lead-out hole along the thickness direction of the wall portion, and the second connecting portion connects the lead-out portion and the first connecting portion.

[0092] In the above technical solution, the electrode lead-out member is provided with a first connecting part located on the side of the wall facing the electrode assembly, a lead-out part located on the side of the wall away from the electrode assembly, and a second connecting part passing through the electrode lead-out hole. The first connecting part is electrically connected to the electrode assembly, and the second connecting part connects the lead-out part and the first connecting part, so as to realize the input or output of electrical energy of the battery cell. The structure is simple and easy to assemble.

[0093] In some embodiments, the battery cell further includes a second insulating member, at least a portion of which is disposed between the wall portion and the lead-out portion.

[0094] In the above technical solution, the battery cell is further provided with a second insulating member, and at least a portion of the second insulating member is disposed between the wall portion and the lead portion, so that the second insulating member can achieve insulation isolation between the wall portion and the lead portion of the electrode lead, thereby reducing the risk of short circuit between the wall portion and the lead portion during use and improving the reliability of the battery cell.

[0095] In some embodiments, along the thickness direction of the wall portion, the first surface faces the electrode assembly, and the body portion further has a second surface facing away from the electrode assembly. The second surface is provided with a mounting groove, and the two ends of the electrode lead-out hole respectively penetrate the bottom surface of the mounting groove and the reinforcing portion; wherein, along the thickness direction of the wall portion, at least a portion of the second insulating member is accommodated in the mounting groove.

[0096] In the above technical solution, an assembly groove is provided on the second surface of the main body, and the assembly groove is correspondingly provided with the electrode lead-out hole. By setting at least a portion of the second insulating member to be accommodated in the assembly groove along the thickness direction of the wall, the assembly groove can play a certain limiting and positioning role for the second insulating member, which helps to reduce the difficulty of assembling the second insulating member between the wall and the lead-out part. In addition, it can reduce the phenomenon of shaking or displacement of the second insulating member during use, which helps to improve the assembly stability of the second insulating member. On the other hand, it can realize that the second insulating member and the main body of the wall share part of the space in the thickness direction of the wall, which helps to optimize the volume of the battery cell.

[0097] In some embodiments, the reinforcing portion includes a first reinforcing portion, and the electrode lead-out hole is correspondingly disposed on the first reinforcing portion; wherein, in a projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the groove wall of the assembly groove is located within the outer contour of the orthographic projection of the first reinforcing portion.

[0098] In the above technical solution, the reinforcing part includes a first reinforcing part, and the electrode lead-out hole is correspondingly disposed at the first reinforcing part of the reinforcing part, so that the electrode lead-out hole is a structure that penetrates the first reinforcing part. By setting the orthographic projection of the groove wall surface of the assembly groove in the thickness direction of the wall part to a structure located within the outer contour of the orthographic projection of the first reinforcing part in the thickness direction of the wall part, the assembly groove is a structure disposed corresponding to the first reinforcing part in the thickness direction of the wall part. Thus, the first reinforcing part of the reinforcing part can strengthen the structural strength of the area where the electrode lead-out hole is disposed in the wall part, and at the same time strengthen the structural strength of the area where the assembly groove is disposed in the body part, thereby improving the structural strength of the area where the assembly groove is disposed in the body part. This can effectively alleviate the risk of deformation, collapse or cracking of the groove wall surface of the wall part corresponding to the assembly groove during use, thereby improving the reliability of the battery cell.

[0099] In some embodiments, in a projection plane perpendicular to the thickness direction of the wall portion, the minimum distance between the outer contour of the orthographic projection of the mounting groove wall and the outer contour of the orthographic projection of the first reinforcing portion is L2, satisfying that L2≥1mm.

[0100] In the above technical solution, by setting the minimum distance between the outer contour of the orthographic projection of the groove wall surface of the assembly groove in the projection plane perpendicular to the thickness direction of the wall and the outer contour of the orthographic projection of the first reinforcing part in the projection plane perpendicular to the thickness direction of the wall to be greater than or equal to 1mm, the coverage effect of the projection of the first reinforcing part in the thickness direction of the wall on the assembly groove can be improved, thereby enhancing the structural strength of the area of ​​the body where the assembly groove is provided by the first reinforcing part. This can further alleviate the risk of deformation, collapse or cracking of the groove wall surface of the wall corresponding to the assembly groove during use, thereby further improving the reliability of the battery cell.

[0101] In some embodiments, L2 ≥ 2 mm.

[0102] In the above technical solution, by further setting the minimum distance between the outer contour of the orthographic projection of the groove wall surface of the assembly groove in the projection plane perpendicular to the thickness direction of the wall and the outer contour of the orthographic projection of the first reinforcing part in the projection plane perpendicular to the thickness direction of the wall to be greater than or equal to 1mm, the coverage effect of the projection of the first reinforcing part in the thickness direction of the wall on the assembly groove can be further improved, thereby further enhancing the structural strength of the area of ​​the body part where the assembly groove is provided by the first reinforcing part. In turn, it can further alleviate the risk of deformation, collapse or cracking of the groove wall surface of the wall part corresponding to the assembly groove during use, thereby further improving the reliability of the battery cell.

[0103] In some embodiments, along the thickness direction of the wall portion, the first reinforcing portion has a fifth surface facing the electrode assembly, and both ends of the electrode lead-out hole penetrate the fifth surface and the bottom surface of the mounting groove, respectively; wherein, along the thickness direction of the wall portion, the minimum distance between the fifth surface and the bottom surface of the mounting groove is L3, satisfying 0.5mm≤L3≤3mm.

[0104] In the above technical solution, by setting the minimum distance between the bottom surface of the assembly groove and the fifth surface of the first reinforcing part in the thickness direction of the wall to 0.5mm to 3mm, on the one hand, the structural strength of the area where the assembly groove is set in the wall can be further improved, which is conducive to further mitigating the deformation, collapse or cracking of the area of ​​the wall used for assembling the electrode lead-out parts, thereby improving the reliability of the battery cell. On the other hand, it can save the space occupied in the thickness direction of the wall between the bottom surface of the assembly groove and the fifth surface of the first reinforcing part for setting the electrode lead-out holes, thereby optimizing the length dimension of the second connecting part of the electrode lead-out parts in the thickness direction of the wall, so as to facilitate the second connecting part to be inserted into the electrode lead-out holes, and reduce the manufacturing cost of the second connecting part.

[0105] In some embodiments, the second connecting portion is riveted to the lead-out portion.

[0106] In the above technical solution, by setting the second connecting part and the lead-out part as a riveted structure, it is beneficial to improve the connection stability between the second connecting part and the lead-out part, so as to reduce the risk of connection failure of the electrode lead-out part during use, and also to reduce the connection difficulty between the second connecting part and the lead-out part, so as to improve the assembly efficiency of the battery cell.

[0107] In some embodiments, the first connecting portion and the second connecting portion are integrally formed.

[0108] In the above technical solution, by setting the first connecting part and the second connecting part as an integrally formed structure, on the one hand, the connection stability between the first connecting part and the second connecting part can be improved to reduce the risk of connection failure of the electrode lead during use. On the other hand, the assembly and connection process of the first connecting part and the second connecting part can be reduced during the assembly of the battery cell, which is conducive to optimizing the production cycle of the battery cell and improving the assembly efficiency of the battery cell.

[0109] In some embodiments, along the thickness direction of the wall portion, the second connecting portion protrudes from the surface of the first connecting portion facing the wall portion.

[0110] In the above technical solution, by setting the second connecting part as a structure that protrudes from the surface of the first connecting part facing the wall, on the one hand, the assembly difficulty of the second connecting part passing through the electrode lead hole can be reduced, thereby reducing the assembly difficulty of the battery cell. On the other hand, the space occupied by the first connecting part and the second connecting part in the direction perpendicular to the thickness of the wall can be saved, which is conducive to optimizing the internal space layout of the battery cell.

[0111] In some embodiments, the first connecting portion and the second connecting portion are separately disposed.

[0112] In the above technical solution, by setting the first connecting part and the second connecting part as separate structures, it is beneficial to improve the assembly flexibility of the electrode lead-out parts, so that the positions of the first connecting part and the second connecting part can be adjusted according to the actual assembly situation to meet the assembly application scenarios of different battery cells.

[0113] In some embodiments, the first connecting portion and the second connecting portion are welded together.

[0114] In the above technical solution, by setting the first connecting part and the second connecting part to be welded to each other, the connection stability between the first connecting part and the second connecting part can be improved, thereby reducing the risk of connection failure of the electrode lead during use.

[0115] In some embodiments, the battery cell further includes a seal; the seal is disposed between the electrode lead and the wall portion, and the seal is configured to seal the gap between the electrode lead and the wall surface of the electrode lead hole.

[0116] In the above technical solution, the battery cell is also provided with a sealing element. By placing the sealing element between the wall and the second connecting part of the electrode lead, the sealing element can seal the gap between the electrode lead and the hole wall surface, thereby reducing the risk of leakage at the electrode lead of the battery cell and improving the stability and reliability of the battery cell.

[0117] In some embodiments, the wall portion is further provided with an injection hole, which penetrates the wall portion along the thickness direction; wherein the injection hole is located in the first region.

[0118] In the above technical solution, by providing an injection hole for injecting electrolyte into the casing on the wall, and the injection hole being located in the first region of the wall, the injection hole has a structure in which one end of the wall penetrates the first region of the wall with a reinforcing part, thereby strengthening the structural strength of the area of ​​the wall with the injection hole. This helps to reduce the risk of deformation, collapse or cracking in the area of ​​the casing with the injection hole during use, thereby improving the stability and reliability of the battery cell.

[0119] In some embodiments, the wall portion is further provided with a pressure relief hole that penetrates the wall portion along its thickness direction, and the battery cell further includes a pressure relief component that is connected to the wall portion and blocks the pressure relief hole. The pressure relief component is configured to release the internal pressure of the battery cell; wherein the pressure relief hole is located in the first region.

[0120] In the above technical solution, by providing a pressure relief hole for installing a pressure relief component and a pressure relief hole on the wall, and the pressure relief hole being located in the first region of the wall, the pressure relief hole has one end penetrating through the first region of the wall where the reinforcement is provided in the thickness direction of the wall. This can strengthen the structural strength of the region of the wall where the pressure relief hole is provided, which helps to reduce the risk of deformation, collapse or cracking in the region of the outer casing where the pressure relief component is provided during use, thereby improving the stability of the pressure relief component and improving the reliability of the battery cell.

[0121] In some embodiments, the outer casing is made of metal.

[0122] In the above technical solution, by setting the outer shell to a metal structure, it is easier to form the outer shell and reduce the manufacturing difficulty of the outer shell. On the other hand, it can enhance the overall structural strength of the outer shell, so as to alleviate the phenomenon of fatigue cracking or deformation and collapse when the outer shell is subjected to external impact or expansion of the battery cell during use. This reduces the risk of the battery cell bursting and being damaged during use, and helps to improve the stability and reliability of the battery cell.

[0123] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0124] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell or the aforementioned battery device. Attached Figure Description

[0125] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0126] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0127] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0128] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0129] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0130] Figure 5 A partial cross-sectional view of a battery cell perpendicular to a first direction, provided for some embodiments of this application;

[0131] Figure 6 for Figure 5 A magnified view of part A of the shown battery cell;

[0132] Figure 7 This is a schematic diagram of the structure of the wall portion of the casing of a battery cell provided in some embodiments of this application;

[0133] Figure 8 A front view of the wall portion of the casing of a battery cell provided in some embodiments of this application, facing the reinforcement in the thickness direction of the wall portion;

[0134] Figure 9 A cross-sectional view of the wall of the casing of a battery cell provided in some embodiments of this application, perpendicular to a first direction;

[0135] Figure 10 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application;

[0136] Figure 11 Axonal view of a first insulating element provided for some embodiments of this application;

[0137] Figure 12 This is an exploded view of the structure of the electrode leads of a battery cell provided in some embodiments of this application.

[0138] Icons: 1000 - Vehicle; 100 - Battery Unit; 10 - Housing; 11 - First Housing Body; 12 - Second Housing Body; 20 - Battery Cell; 21 - Housing; 211 - Wall; 211a - Body Section; 211b - Reinforcing Section; 211c - Edge Section; 2111 - Electrode Lead-out Hole; 2112 - First Surface; 2113 - First Reinforcing Section; 2113a - Main Body Area; 2113b - Connecting Rib; 2113c - Fifth Surface; 2114 - Liquid Injection Hole; 2115 - Second Reinforcing Section; 2116 - First Groove; 2116a - First Side; 2116b - Second Side; 2116c - Third Side; 2116d - Fourth Side; 2117 - Third Reinforcing Section; 2118 - Fourth Reinforcing Section; 2119 - Second Surface; 2119a - Assembly Groove; 21 2-Housing; 2121-Receiving cavity; 2122-Opening; 213-End cap; 22-Electrode assembly; 221-Main body; 222-Electrode tab; 2221-Connecting area; 2222-Bending area; 2222a-Bending section; 23-Electrode lead-out; 231-First connecting part; 232-Lead-out part; 2321-Rivet hole; 233-Second connecting part; 24-First insulating member; 241-Third surface; 2411-Second groove; 2411a-First groove; 2411b-Second groove; 2412-Second protrusion; 242-Fourth surface; 2421-First protrusion; 243-Limiting part; 244-Mounting hole; 25-Second insulating member; 26-Sealing member; 200-Controller; 300-Motor; X-Thickness direction of the wall; Y-First direction; Z-Second direction. Detailed Implementation

[0139] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0140] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0141] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0142] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0143] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0144] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0145] In this application, "multiple" means two or more (including two).

[0146] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0147] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0148] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0149] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0150] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0151] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0152] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide 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 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0153] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0154] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0155] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0156] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0157] 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 is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0158] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. 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 battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0159] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0160] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0161] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0162] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0163] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0164] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0165] In some embodiments, the electrolyte salt may include 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.

[0166] In some embodiments, the solvent may include at least one selected from 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 selected from 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.

[0167] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0168] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0169] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0170] As an example, inorganic solid electrolytes may include 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 phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0171] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0172] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0173] In some implementations, the electrode assembly has a stacked structure.

[0174] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0175] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0176] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0177] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0178] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0179] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0180] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0181] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0182] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0183] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0184] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0185] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0186] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0187] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0188] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0189] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0190] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0191] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0192] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0193] For a typical battery cell, it usually includes a casing and an electrode assembly. The electrode assembly is located inside the casing, and the casing has electrode leads. In related technologies, an electrode lead hole is usually provided on one wall of the casing, and the electrode lead is correspondingly located at the electrode lead hole. The casing also has through holes such as an injection hole for injecting electrolyte into the casing and a pressure relief hole for installing pressure relief components. However, this structure of the battery cell weakens the structural strength of the area of ​​the casing with through holes such as electrode leads, injection holes, and pressure relief holes. Furthermore, since the electrode leads and other components are subject to the pulling and twisting of external components or the expansion and contraction of the battery cell during use, the area of ​​the casing with through holes is prone to fatigue cracking or deformation and collapse when subjected to pulling and twisting or the expansion and contraction of the battery cell. This can lead to the battery cell being prone to bursting and damage during use, which is detrimental to improving the stability and reliability of the battery cell.

[0194] Based on the above considerations, in order to solve the problem of low stability and reliability of battery cells, this application provides a battery cell including a casing, an electrode assembly, and an electrode lead-out member. The casing has a wall portion, and the wall portion is provided with an electrode lead-out hole that penetrates the wall portion along its thickness direction. The electrode assembly is housed within the casing. The electrode lead-out member is disposed in the electrode lead-out hole and is electrically connected to the electrode assembly. The wall portion includes an integrally formed body portion and a reinforcing portion. Along the thickness direction of the wall portion, the reinforcing portion protrudes from a first surface on one side of the body portion. The area on the first surface where the reinforcing portion protrudes is the first region of the wall portion, and the electrode lead-out hole is disposed in the first region.

[0195] In this type of battery cell, an electrode lead-out hole is provided on the wall portion, and the electrode lead-out hole penetrates the wall portion along its thickness direction, allowing the electrode lead-out component of the battery cell to be assembled there, thereby realizing the input or output of electrical energy of the battery cell. The wall portion includes a body portion and a reinforcing portion protruding from a first surface of the body portion, and the reinforcing portion and the body portion are integrally formed. By setting the electrode lead-out hole in the first region of the wall portion, the electrode lead-out hole has a structure that penetrates the first region of the wall portion with the reinforcing portion in the thickness direction, thereby strengthening the structural strength of the region of the wall portion with the electrode lead-out hole. This battery cell structure not only enables the assembly of the battery cell but also effectively improves the structural strength of the region of the wall portion with the electrode lead-out hole, thus effectively mitigating fatigue cracking or deformation collapse in the region of the wall portion with the electrode lead-out hole when subjected to tension or external impact during use. This reduces the risk of the battery cell exploding during use and helps improve the stability and reliability of the battery cell.

[0196] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and battery devices disclosed in this application. This helps to mitigate the problem of battery cell casings cracking or being damaged during use, thereby improving the stability and reliability of the battery cells.

[0197] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0198] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0199] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0200] In some embodiments of this application, the battery device 100 can not only serve as the operating power or 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.

[0201] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0202] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0203] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0204] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0205] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0206] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0207] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a partial cross-sectional view of a battery cell 20 provided in some embodiments of this application, perpendicular to the first direction Y. Figure 6 for Figure 5 A magnified view of part A of the battery cell 20 shown. Figure 7 This is a schematic diagram of the structure of the wall portion 211 of the outer casing 21 of the battery cell 20 provided in some embodiments of this application. Figure 8 This is a front view of the wall portion 211 of the casing 21 of the battery cell 20 provided in some embodiments of this application, facing the reinforcement portion 211b in the thickness direction X of the wall portion. Figure 9This is a cross-sectional view of the wall 211 of the casing 21 of a battery cell 20 provided in some embodiments of this application, perpendicular to the first direction Y. This application provides a battery cell 20, which includes a casing 21, an electrode assembly 22, and an electrode lead-out member 23. The casing 21 has a wall 211, and the wall 211 is provided with an electrode lead-out hole 2111, which penetrates the wall 211 along the thickness direction X. The electrode assembly 22 is housed within the casing 21. The electrode lead-out member 23 is disposed in the electrode lead-out hole 2111, and is electrically connected to the electrode assembly 22. The wall portion 211 includes an integrally formed body portion 211a and a reinforcing portion 211b. Along the thickness direction X of the wall portion, the reinforcing portion 211b protrudes from a first surface 2112 on one side of the body portion 211a. The area on the first surface 2112 where the reinforcing portion 211b protrudes is the first region of the wall portion 211, and the area on the first surface 2112 where the reinforcing portion 211b does not protrude is the second region of the wall portion 211. An electrode lead-out hole 2111 is provided in the first region.

[0208] The outer shell 21 can also be used to contain electrolytes, such as electrolyte solution. The outer shell 21 can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 21 can be made of various materials, such as metal or non-metal. In this embodiment, the outer shell 21 is made of metal, such as copper, iron, aluminum, steel, or aluminum alloy.

[0209] In some embodiments, the housing 21 can be a sealed structure or a non-sealed structure. As an example, when the housing 21 is a sealed structure, it can protect the electrode assembly 22 and prevent, to some extent, electrolyte leakage. When the housing 21 is a non-sealed structure, it can still protect the electrode assembly 22, and a sealing bag may be included between the housing 21 and the electrode assembly 22 to encapsulate the electrode assembly 22 and the electrolyte.

[0210] Optionally, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has a receiving cavity 2121 inside, which is used to receive the electrode assembly 22. The receiving cavity 2121 has an opening 2122. That is, the housing 212 is a hollow structure with an opening 2122 at one end. The end cap 213 covers the opening 2122 of the housing 212 and forms a sealed connection to form a sealed space for receiving the electrode assembly 22 and the electrolyte.

[0211] The housing 212 includes a bottom wall and a side wall. The bottom wall and the end cap 213 are arranged opposite each other along the thickness direction X of the wall. The side wall surrounds the bottom wall, and one end of the side wall in the thickness direction X of the wall is connected to the bottom wall, while the other end forms an opening 2122.

[0212] It should be noted that the wall portion 211 with the electrode lead-out hole 2111 can be the end cap 213 of the outer casing 21, or it can be a wall of the housing 212 of the outer casing 21. For example, in... Figure 3 and Figure 4 In this embodiment, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the bottom wall of the housing 212 and the end cap 213 that are disposed opposite to each other, or the wall portion 211 can also be the side wall of the housing 212 and the end cap 213 that are adjacent to each other and connected to each other.

[0213] When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 212 first, and the electrolyte can be filled into the housing 212. Then, the end cap 213 can be closed onto the opening 2122 of the housing 212 to complete the assembly of the battery cell 20.

[0214] The outer shell 21 can be of various shapes, such as a cylinder, cuboid, or prism. The shape of the outer shell 21 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, then a cylindrical outer shell 21 can be selected; if the electrode assembly 22 is a cuboid structure, then a cuboid outer shell 21 can be selected.

[0215] For example, in Figure 3 and Figure 4 In the middle, the outer shell 21 is in the shape of a cuboid. The height direction of the outer shell 21 is the thickness direction X of the wall. Correspondingly, the projection of the wall 211 on the thickness direction X of the wall is rectangular. The length direction of the outer shell 21 is the first direction Y, which is also the length direction of the wall 211. The thickness direction of the outer shell 21 is the second direction Z, which is also the width direction of the wall 211.

[0216] Of course, it is understandable that the battery cell 20 is not limited to the above structure. The battery cell 20 can also be other structures. For example, the housing 21 can include a housing 212 and two end caps 213. The housing 212 is a hollow structure with openings 2122 formed on both opposite sides in the thickness direction X of the wall. One end cap 213 is fitted onto one opening 2122 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the housing 212 has openings 2122 on both opposite sides, and the two end caps 213 are fitted onto both sides of the housing 212 to close the corresponding openings 2122.

[0217] End cap 213 covers opening 2122 and is connected to housing 212, that is, end cap 213 and housing 212 are interconnected, and end cap 213 serves to close opening 2122. Optionally, the connection structure between end cap 213 and housing 212 can be various, such as welding connection or snap-fit ​​connection.

[0218] Among them, see Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the wall portion 211 is an end cap 213. The wall portion 211 includes a body portion 211a. Along the thickness direction X of the wall portion, a portion of the body portion 211a is inserted into the receiving cavity 2121 through the opening 2122. The outer peripheral surface of the body portion 211a abuts against the inner peripheral surface of the housing 212, and the body portion 211a is welded to the housing 212. In some embodiments, the wall portion 211 may also include an edge portion 211c. The edge portion 211c protrudes from the outer peripheral surface of the body portion 211a and abuts against the end of the housing 212 where the opening 2122 is provided along the thickness direction X of the wall portion.

[0219] Optionally, the electrode lead-out hole 2111 provided on the wall portion 211 can be one or more. For example, in Figure 7 and Figure 8 In the middle, the wall portion 211 is provided with two electrode lead-out holes 2111, and the two electrode lead-out holes 2111 are arranged at intervals along the first direction Y. Correspondingly, the battery cell 20 includes two electrode lead-out holes 2111, and each electrode lead-out member 23 is correspondingly disposed at one electrode lead-out hole 2111.

[0220] In the embodiments of this application, see Figure 7 , Figure 8 and Figure 9 As shown, the wall portion 211 includes an integrally formed body portion 211a and a reinforcing portion 211b, that is, the body portion 211a and the reinforcing portion 211b of the wall portion 211 are an integral structure. Correspondingly, the body portion 211a and the reinforcing portion 211b of the wall portion 211 can be manufactured by an integral forming process such as stamping, milling or casting.

[0221] It should be noted that in the embodiment where the wall portion 211 also includes an edge portion 211c, and the edge portion 211c protrudes from the outer peripheral surface of the body portion 211a, the edge portion 211c and the body portion 211a are also integrally formed structures.

[0222] For example, in the embodiments of this application, the body portion 211a, the reinforcing portion 211b, and the edge portion 211c of the wall portion 211 are all structures formed by a stamping process.

[0223] Along the thickness direction X of the wall portion, the reinforcing part 211b protrudes from the first surface 2112 on one side of the main body portion 211a. That is, the surface of the main body portion 211a on one side of the wall portion in the thickness direction X is the first surface 2112. Correspondingly, the reinforcing part 211b protrudes from the main body portion 211a on one side of the wall portion in the thickness direction X, so that the main body portion 211a and the reinforcing part 211b are stacked and connected along the thickness direction X of the wall portion.

[0224] The first surface 2112 can be the inner surface of the body portion 211a facing the electrode assembly 22 in the thickness direction X of the wall portion, or it can be the outer surface of the body portion 211a facing away from the electrode assembly 22 in the thickness direction X of the wall portion.

[0225] For example, in the embodiments of this application, the first surface 2112 is the inner surface of the body portion 211a on the side facing the electrode assembly 22 in its thickness direction.

[0226] The area on the first surface 2112 where the reinforcing part 211b protrudes is the first region of the wall portion 211, and the area on the first surface 2112 where the reinforcing part 211b does not protrude is the second region of the wall portion 211. In other words, combined with... Figure 7 and Figure 8 As shown, the first region of the wall portion 211 is the part where the body portion 211a and the reinforcing portion 211b overlap in the thickness direction X of the wall portion, while the second region of the wall portion 211 is the part where the body portion 211a and the reinforcing portion 211b do not overlap in the thickness direction X of the wall portion.

[0227] Electrode lead-out hole 2111 is provided in the first region, that is, the electrode lead-out hole 2111 is provided in the region where the reinforcing part 211b protrudes from the body part 211a, so that the electrode lead-out hole 2111 has a structure that penetrates both the body part 211a and the reinforcing part 211b in the thickness direction X of the wall part. In other words, in the thickness direction X of the wall part, a part of the hole segment of the electrode lead-out hole 2111 is located in the body part 211a, and another part of the hole segment is located in the reinforcing part 211b. Correspondingly, the projection of the hole wall surface of the electrode lead-out hole 2111 in the thickness direction X of the wall part is located inside the outer contour of the reinforcing part 211b, so that the reinforcing part 211b has a structure that at least partially surrounds the electrode lead-out hole 2111.

[0228] In the embodiments of this application, the structure of the electrode assembly 22 can be various. The electrode assembly 22 can be a wound structure formed by winding a positive electrode sheet, an insulating member and a negative electrode sheet, or a stacked structure formed by stacking a positive electrode sheet, an insulating member and a negative electrode sheet.

[0229] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0230] The electrode assembly 22 includes a main body 221 and tabs 222. The main body 221 is the primary component of the electrode assembly 22 used for electrochemical reactions to occur in the battery cell 20. For example, in... Figure 4 In the middle, the electrode 222 is connected to one end of the main body 221 facing the wall 211 in the thickness direction X of the wall, that is, in the thickness direction X of the wall, the electrode 222 is located between the main body 221 and the wall 211.

[0231] It should be noted that the tabs 222 of the electrode assembly 22 are either formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer, or by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer. If the tab 222 is the positive tab of the electrode assembly 22, then the tab 222 is formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer; if the tab 222 is the negative tab of the electrode assembly 22, then the tab 222 is formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer.

[0232] Optionally, the electrode assembly 22 housed within the housing 21 can be one or more. For example, in... Figure 4 In this embodiment, the outer casing 21 is provided with only one electrode assembly 22. Of course, in other embodiments, multiple electrode assemblies 22 can also be provided inside the outer casing 21. The multiple electrode assemblies 22 are stacked along the thickness direction of the battery cell 20, that is, the multiple electrode assemblies 22 are stacked along the second direction Z. For example, the number of electrode assemblies 22 contained in the outer casing 21 can be two, three, four, five or six, etc.

[0233] In the embodiments of this application, see Figure 3 and Figure 4 As shown, part of the electrode lead 23 passes through the electrode lead hole 2111. The electrode lead 23 is insulated and mounted on the wall 211. The electrode lead 23 is electrically connected to the tab 222 of the electrode assembly 22 to output or input the electrical energy of the battery cell 20.

[0234] The electrode lead-out member 23 is insulated and mounted on the wall portion 211, meaning that no electrical connection is formed between the electrode lead-out member 23 and the wall portion 211.

[0235] exist Figure 3 and Figure 4In the battery cell 20, there are two electrode leads 23. The two electrode leads 23 are insulatedly mounted on the wall portion 211 and are spaced apart along the first direction Y. Correspondingly, the wall portion 211 is provided with two electrode lead holes 2111 arranged at intervals along the first direction Y. Each electrode lead 23 passes through one electrode lead hole 2111. Each electrode assembly 22 has two tabs 222 with opposite polarities. Both tabs 222 are connected to one end of the main body portion 221 facing the wall portion 211 in the thickness direction X of the wall portion and are spaced apart along the first direction Y. The two electrode leads 23 are electrically connected to the two tabs 222 of the electrode assembly 22 respectively to realize the input or output of electrical energy of the battery cell 20.

[0236] In some embodiments, the battery cell 20 may further include a pressure relief component disposed on the housing 21, which is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0237] Optionally, the pressure relief component may be disposed on the end cap 213 or on the housing 212. For example, in this embodiment of the application, the wall portion 211 is the end cap 213, and the pressure relief component is disposed on the bottom wall of the housing 212 opposite to the end cap 213 in the thickness direction X of the wall portion.

[0238] Similarly, the pressure relief component and the outer casing 21 can be an integrally formed structure or a separate structure. If the pressure relief component and the outer casing 21 are separate structures, the pressure relief component can be connected to the outer casing 21 by welding or other means. Correspondingly, the pressure relief component can be a component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve, or safety valve. If the pressure relief component and the outer casing 21 are an integrally formed structure, the pressure relief component is an area on the outer casing 21 with a weak structure, such as an area on the outer casing 21 with a groove.

[0239] In this embodiment, an electrode lead-out hole 2111 is provided on the wall portion 211, and the electrode lead-out hole 2111 penetrates the wall portion 211 along the thickness direction X, so that the electrode lead-out hole 2111 can be fitted with the electrode lead-out member 23 of the battery cell 20 to realize the input or output of electrical energy of the battery cell 20. The wall portion 211 includes a body portion 211a and a reinforcing portion 211b protruding from the first surface 2112 of the body portion 211a, and the reinforcing portion 211b and the body portion 211a are integrally formed. By providing the electrode lead-out hole 2111 in the first region of the wall portion 211, the electrode lead-out hole 2111 penetrates the wall portion along the thickness direction X. The first region of the part 211 with the reinforcing part 211b is provided to strengthen the structural strength of the region of the wall part 211 where the electrode lead-out hole 2111 is provided. The battery cell 20 with this structure can effectively improve the structural strength of the region of the wall part 211 where the electrode lead-out hole 2111 is provided while assembling the battery cell 20. This can effectively alleviate the phenomenon of fatigue cracking or deformation collapse in the region of the wall part 211 where the electrode lead-out hole 2111 is provided when subjected to tension or external impact during use, thereby reducing the risk of the battery cell 20 bursting and being damaged during use, and improving the stability and reliability of the battery cell 20.

[0240] According to some embodiments of this application, see Figure 7 , Figure 8 and Figure 9 As shown, the reinforcing part 211b includes a first reinforcing part 2113, the first reinforcing part 2113 has a main body region 2113a, and an electrode lead-out hole 2111 is disposed in the main body region 2113a, the main body region 2113a is disposed around the electrode lead-out hole 2111.

[0241] The main body region 2113a is arranged around the electrode lead-out hole 2111. That is, the main body region 2113a is arranged around the hole wall of the electrode lead-out hole 2111. In other words, in the projection plane perpendicular to the thickness direction X of the wall, the outer contours of the orthographic projection of the hole wall of the electrode lead-out hole 2111 and the orthographic projection of the main body region 2113a are arranged at intervals.

[0242] In this embodiment, the electrode lead-out hole 2111 is disposed in the main body region 2113a of the first reinforcing part 2113, and the main body region 2113a is a structure surrounding the electrode lead-out hole 2111. This allows the main body region 2113a to provide overall reinforcement to the wall part 211 around the area where the electrode lead-out hole 2111 is disposed. This further enhances the reinforcing effect of the reinforcing part 211b on the area of ​​the wall part 211 where the electrode lead-out hole 2111 is disposed, thereby further mitigating the phenomenon of fatigue cracking or deformation and collapse when the area of ​​the wall part 211 where the electrode lead-out hole 2111 is disposed is subjected to tension or external impact during use.

[0243] In some embodiments, see Figure 8 and Figure 9 As shown, in the projection plane perpendicular to the thickness direction X of the wall, the geometric center of the orthographic projection of the main body region 2113a coincides with the geometric center of the orthographic projection of the hole wall of the electrode lead-out hole 2111. That is, the main body region 2113a and the electrode lead-out hole 2111 are coaxially arranged, such that the geometric center of the orthographic projection of the main body region 2113a in the thickness direction X of the wall is located on the central axis of the electrode lead-out hole 2111.

[0244] In this embodiment, by setting the geometric center of the orthographic projection of the main body region 2113a in the thickness direction X perpendicular to the wall portion to coincide with the geometric center of the orthographic projection of the hole wall surface of the electrode lead-out hole 2111 in the thickness direction X perpendicular to the wall portion, the main body region 2113a and the electrode lead-out hole 2111 are coaxially arranged. This improves the shape regularity of the main body region 2113a and the electrode lead-out hole 2111, reducing the processing difficulty of the wall portion 211. Furthermore, it ensures that the area of ​​the wall portion 211 where the electrode lead-out hole 2111 is located is reinforced by the main body region 2113a by the same width, further enhancing the overall reinforcement effect of the main body region 2113a on the wall portion 211 around the area where the electrode lead-out hole 2111 is located.

[0245] In some embodiments, see Figure 9 As shown, along the thickness direction X of the wall, the thickness of the main body region 2113a protruding from the first surface 2112 is T1, which satisfies 0.2mm≤T1≤2mm.

[0246] Wherein, T1 is the thickness dimension of the main body region 2113a of the first reinforcing part 2113 protruding on the first surface 2112 in the thickness direction X of the wall.

[0247] For example, T1 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, etc.

[0248] In this embodiment, by setting the size of the main body region 2113a protruding from the first surface 2112 in the thickness direction X of the wall to 0.2mm to 2mm, the thickness of the main body region 2113a in the thickness direction X of the wall is 0.2mm to 2mm. On the one hand, setting the thickness of the main body region 2113a to be greater than or equal to 0.2mm can improve the structural strength of the main body region 2113a itself, so that the main body region 2113a has sufficient thickness and strength to strengthen the area of ​​the wall 211 where the electrode lead-out hole 2111 is provided, which is beneficial to improving the structural strength of the area of ​​the wall 211 where the electrode lead-out hole 2111 is provided. On the other hand, setting the thickness of the main body region 2113a to be less than or equal to 2mm can reduce the height of the main body region 2113a protruding from the first surface 2112, thereby reducing the space occupied by the main body region 2113a in the thickness direction X of the wall, and facilitating the assembly of the electrode lead-out member 23 at the electrode lead-out hole 2111, which is beneficial to reducing the assembly difficulty of the electrode lead-out member 23.

[0249] According to some embodiments of this application, in conjunction with Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, the wall portion 211 is provided with two electrode lead-out holes 2111, and the battery cell 20 includes two electrode leads 23 with opposite polarities. Each electrode lead 23 is correspondingly disposed in one electrode lead-out hole 2111, and both electrode leads 23 are electrically connected to the electrode assembly 22. The reinforcing portion 211b includes a plurality of first reinforcing portions 2113 arranged at intervals along a first direction Y. Each electrode lead-out hole 2111 is disposed in one first reinforcing portion 2113, and the first direction Y is perpendicular to the thickness direction X of the wall portion.

[0250] Each electrode lead-out hole 2111 is disposed on a first reinforcing part 2113, that is, each first reinforcing part 2113 is provided with at most one electrode lead-out hole 2111. In other words, each first reinforcing part 2113 is penetrated by at most one electrode lead-out hole 2111. Of course, it can be a structure in which the first reinforcing part 2113 and the electrode lead-out hole 2111 are provided in a one-to-one correspondence, or the number of first reinforcing parts 2113 is greater than the number of electrode lead-out holes 2111.

[0251] For example, in Figure 8 In the middle, the wall portion 211 is provided with two electrode lead-out holes 2111 and one liquid injection hole 2114. The reinforcing portion 211b includes three first reinforcing portions 2113. The three first reinforcing portions 2113 are arranged at intervals along the first direction Y. Two of the three first reinforcing portions 2113 are provided with electrode lead-out holes 2111, and the other first reinforcing portion 2113 is provided with a corresponding liquid injection hole 2114.

[0252] In this embodiment, by setting the reinforcing portion 211b to include a plurality of first reinforcing portions 2113 arranged at intervals along the first direction Y, and each electrode lead-out hole 2111 corresponding to one first reinforcing portion 2113, it is convenient to strengthen the area of ​​the wall portion 211 where the electrode lead-out holes 2111 are provided at different positions, which is beneficial to improving the strengthening effect of the area of ​​the wall portion 211 where the electrode lead-out holes 2111 are provided, and can reduce the molding difficulty of the wall portion 211. On the other hand, it can reduce the stress influence between the areas of the wall portion 211 where the electrode lead-out holes 2111 are provided at different positions, which is beneficial to reducing the risk of tearing or cracking of the wall portion 211 at the electrode lead-out holes 2111.

[0253] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, the wall portion 211 may also be provided with a liquid injection hole 2114, which penetrates the wall portion 211 along the thickness direction X. The liquid injection hole 2114 is located in the first region, and the liquid injection hole 2114 and the two electrode lead-out holes 2111 are respectively located in different first reinforcing portions 2113. Along the first direction Y, the first reinforcing portion 2113 with the liquid injection hole 2114 is located between the two first reinforcing portions 2113 with the electrode lead-out holes 2111.

[0254] The injection hole 2114 penetrates the wall portion 211 along the thickness direction X of the wall portion. The injection hole 2114 is located in the first region, that is, the injection hole 2114 is also located on the wall portion 211, and is correspondingly located in the region where the body portion 211a of the wall portion 211 has a protruding reinforcing portion 211b. This makes the injection hole 2114 a structure that penetrates both the body portion 211a and the reinforcing portion 211b in the thickness direction X of the wall portion. In other words, in the thickness direction X of the wall portion, a portion of the injection hole 2114 is located inside the body portion 211a, while another portion is located inside the reinforcing portion 211b. Correspondingly, the projection of the hole wall surface of the injection hole 2114 in the thickness direction X of the wall portion is located inside the outer contour of the reinforcing portion 211b, making the reinforcing portion 211b a structure that at least partially surrounds the injection hole 2114.

[0255] The injection hole 2114 and the two electrode lead-out holes 2111 are respectively disposed in different first reinforcing parts 2113. That is, the reinforcing part 211b includes at least three first reinforcing parts 2113, and the injection hole 2114 and the two electrode lead-out holes 2111 respectively penetrate different first reinforcing parts 2113.

[0256] Along the first direction Y, a first reinforcing portion 2113 with an injection hole 2114 is located between two first reinforcing portions 2113 with electrode lead-out holes 2111. That is, the reinforcing portion 211b includes at least three first reinforcing portions 2113, which are arranged at intervals along the first direction Y. Correspondingly, the injection hole 2114 and the two electrode lead-out holes 2111 respectively penetrate the three first reinforcing portions 2113, so that the injection hole 2114 and the two electrode lead-out holes 2111 are arranged at intervals along the first direction Y, and the injection hole 2114 is located between the two electrode lead-out holes 2111 in the first direction Y, so that the first reinforcing portion 2113 with the injection hole 2114 is located between the two first reinforcing portions 2113 with the electrode lead-out holes 2111 in the first direction Y.

[0257] In this embodiment, the wall portion 211 is provided with an injection hole 2114 and two electrode lead-out holes 2111. The injection hole 2114 is also provided in the first region of the wall portion 211, and the injection hole 2114 and the two electrode lead-out holes 2111 are respectively provided in three first reinforcing portions 2113. By setting the first reinforcing portion 2113 with the injection hole 2114 in the first direction Y to be located between the two first reinforcing portions 2113 with the electrode lead-out holes 2111, on the one hand, the layout of the area on the wall portion 211 where the injection hole 2114 and the two electrode lead-out holes 2111 are provided can be optimized, which is beneficial to improving the regularity of the battery cell 20. On the other hand, the stress influence between the area on the wall portion 211 where the injection hole 2114 and the two electrode lead-out holes 2111 are provided can be reduced, which is beneficial to improving the stability of the battery cell 20 in use.

[0258] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 5 As shown, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity 2121, and an opening 2122 is formed at one end of the housing 212 in the thickness direction X of the wall portion. The opening 2122 communicates with the cavity 2121, and at least a portion of the electrode assembly 22 is accommodated within the cavity 2121. The end cap 213 covers the opening 2122 and is connected to the housing 212, and the wall portion 211 serves as the end cap 213.

[0259] Among them, the wall portion 211 is the end cap 213, that is, the end cap 213 includes an integrally formed body portion 211a and a reinforcing portion 211b, so that the end cap 213 forms a first region and a second region, and the electrode lead-out hole 2111 is provided on the end cap 213, and correspondingly, the electrode lead-out member 23 is installed on the end cap 213.

[0260] End cap 213 covers the opening 2122 and is connected to the housing 212. That is, end cap 213 is a structure that is connected to the end of housing 212 that has the opening 2122, so that end cap 213 can close the opening 2122. Optionally, the structure in which housing 212 and end cap 213 are connected can be various, such as welding connection, bonding or snap-fit ​​connection.

[0261] In this embodiment, by setting the wall portion 211 as the end cap 213 of the outer shell 21 for covering the opening 2122, it is convenient to form the wall portion 211 into a body portion 211a and a reinforcing portion 211b, and it is convenient to process the electrode lead-out hole 2111 and assemble the electrode lead-out member 23 on the wall portion 211. This helps to reduce the molding difficulty of the wall portion 211 and the assembly difficulty of the battery cell 20, thereby reducing the manufacturing difficulty of the battery cell 20.

[0262] In some embodiments, combined with Figure 5 , Figure 6 and Figure 9 As shown, along the thickness direction X of the wall portion, at least a portion of the body portion 211a is inserted into the receiving cavity 2121 through the opening 2122, the outer peripheral surface of the body portion 211a abuts against the inner peripheral surface of the housing 212, and the body portion 211a is welded to the housing 212.

[0263] At least a portion of the body portion 211a is inserted into the receiving cavity 2121 through the opening 2122, and the outer peripheral surface of the body portion 211a abuts against the inner peripheral surface of the housing 212. That is, the body portion 211a is a structure that is inserted into the opening 2122 along the thickness direction X of the wall portion, and the outer peripheral surface of the body portion 211a abuts against the inner peripheral surface of the housing 212.

[0264] In this embodiment, by configuring the body portion 211a to be inserted into the receiving cavity 2121 of the housing 212 through the opening 2122 of the housing 212, and the outer peripheral surface of the body portion 211a abutting against and welded to the inner peripheral surface of the housing 212, the assembly difficulty between the housing 212 and the end cap 213 can be reduced, and the assembly accuracy between the housing 212 and the end cap 213 can be improved. On the other hand, the connection stability and reliability between the end cap 213 and the housing 212 can be improved, which helps to reduce the phenomenon of connection failure between the end cap 213 and the housing 212 during use, thereby reducing the risk of leakage of the battery cell 20 during use.

[0265] According to some embodiments of this application, see Figure 6 , Figure 7 , Figure 8 and Figure 9As shown, the reinforcing portion 211b may include a second reinforcing portion 2115 extending circumferentially along the body portion 211a, the outer peripheral surface of the second reinforcing portion 2115 being flush with the outer peripheral surface of the body portion 211a. The outer peripheral surface of the second reinforcing portion 2115 abuts against the inner peripheral surface of the housing 212, and the second reinforcing portion 2115 is welded to the housing 212.

[0266] The second reinforcing part 2115 is a structure that extends circumferentially along the main body part 211a. Correspondingly, the second reinforcing part 2115 can be a ring structure that extends circumferentially along the main body part 211a, that is, the second reinforcing part 2115 is a structure that extends circumferentially along the main body part 211a and is connected end to end. Of course, the second reinforcing part 2115 can also be a structure that extends circumferentially along the main body part 211a and is not connected end to end.

[0267] For example, in Figure 7 and Figure 8 In the middle, the second reinforcing part 2115 is a ring structure that extends circumferentially along the main body part 211a.

[0268] The outer peripheral surface of the second reinforcing part 2115 is flush with the outer peripheral surface of the main body part 211a, that is, the outer peripheral surface of the second reinforcing part 2115 and the outer peripheral surface of the main body part 211a are coplanar, so that the outer peripheral surface of the second reinforcing part 2115 and the outer peripheral surface of the main body part 211a can both abut against the inner peripheral surface of the shell 212.

[0269] The second reinforcing part 2115 is welded to the shell 212. That is to say, the wall part 211 is a structure in which both the main body part 211a and the second reinforcing part 2115 are welded to the shell 212.

[0270] In this embodiment, the reinforcing part 211b further includes a second reinforcing part 2115 disposed on the first surface 2112 of the body part 211a. By setting the second reinforcing part 2115 to extend circumferentially along the body part 211a and having its outer peripheral surface flush with the outer peripheral surface of the body part 211a, both the outer peripheral surface of the second reinforcing part 2115 and the outer peripheral surface of the body part 211a can abut against the inner peripheral surface of the housing 212. This increases the contact area and welding area between the end cap 213 and the housing 212, thereby further improving the connection stability and reliability between the end cap 213 and the housing 212. This helps to further reduce the phenomenon of connection failure between the end cap 213 and the housing 212 during use, and further reduces the leakage risk of the battery cell 20 during use.

[0271] In some embodiments, see Figure 7 and Figure 8As shown, the second reinforcing part 2115 is a ring structure that extends circumferentially along the main body part 211a. In other words, the second reinforcing part 2115 is a structure that extends circumferentially along the main body part 211a and is connected end to end.

[0272] In this embodiment, by setting the second reinforcing part 2115 as an annular structure extending circumferentially along the body part 211a, the outer peripheral surface of the second reinforcing part 2115 can abut against the inner peripheral surface of the housing 212 throughout the entire circumferential direction of the body part 211a, thereby further increasing the contact area and welding area between the end cap 213 and the housing 212, and further improving the connection stability and reliability between the end cap 213 and the housing 212.

[0273] Based on some embodiments of this application, please refer to... Figure 6 , Figure 7 and Figure 9 As shown, the minimum distance between the outer peripheral surface of the second reinforcing part 2115 and the inner peripheral surface of the second reinforcing part 2115 is L1, which satisfies 1mm≤L1≤5mm.

[0274] The minimum distance between the outer peripheral surface of the second reinforcing part 2115 and the inner peripheral surface of the second reinforcing part 2115 is L1, that is, the minimum thickness of the part of the second reinforcing part 2115 that abuts against and is welded to the inner peripheral surface of the housing 212 in the radial direction of the body part 211a is L1.

[0275] For example, in Figure 9 In this embodiment, the outer peripheral surface of the second reinforcing part 2115 and the outer peripheral surface of the main body part 211a are coplanar, and the outer peripheral surface of the second reinforcing part 2115 and the end face of the second reinforcing part 2115 away from the main body part 211a in the thickness direction X of the wall are connected by a chamfered surface. Of course, in other embodiments, the outer peripheral surface of the second reinforcing part 2115 and the end face of the second reinforcing part 2115 away from the main body part 211a in the thickness direction X of the wall can also be directly connected.

[0276] For example, the minimum distance L1 between the outer peripheral surface of the second reinforcing part 2115 and the inner peripheral surface of the second reinforcing part 2115 can be 1mm, 1.1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 4.9mm, or 5mm, etc.

[0277] In this embodiment, by setting the minimum distance between the outer peripheral surface of the second reinforcing part 2115 and the inner peripheral surface of the second reinforcing part 2115 to 1mm to 5mm, the minimum thickness of the area where the second reinforcing part 2115 is welded to the housing 212 in the radial direction of the body part 211a is 1mm to 5mm. On the one hand, this can increase the thickness of the part where the second reinforcing part 2115 is welded to the housing 212, which is beneficial to improve the welding penetration between the end cap 213 and the housing 212, thereby improving the welding stability and welding quality between the end cap 213 and the housing 212. On the other hand, it can alleviate the problem of the second reinforcing part 2115 occupying too much space on the first surface 2112, thereby reducing the limitation of the area where the electrode lead hole 2111 and the first reinforcing part 2113 are set in the body part 211a, and can also reduce the interference between the second reinforcing part 2115 and the electrode lead 23, thereby reducing the manufacturing difficulty of the battery cell 20.

[0278] In some embodiments, see Figure 6 and Figure 9 As shown, 1.5mm≤L1≤4mm.

[0279] In this embodiment, by further setting the minimum distance between the outer peripheral surface of the second reinforcing part 2115 and the inner peripheral surface of the second reinforcing part 2115 to 1.5mm to 4mm, the minimum thickness of the area where the second reinforcing part 2115 is welded to the housing 212 in the radial direction of the body part 211a is 1.5mm to 4mm. On the one hand, this can further increase the thickness of the part where the second reinforcing part 2115 is welded to the housing 212, which is beneficial to further improve the welding penetration between the end cap 213 and the housing 212, thereby further improving the welding stability and welding quality between the end cap 213 and the housing 212. On the other hand, this can further alleviate the problem of the second reinforcing part 2115 occupying too much space on the first surface 2112, thereby further reducing the phenomenon of limited area for setting electrode lead-out holes 2111 and the first reinforcing part 2113 in the body part 211a, and further reducing the interference between the second reinforcing part 2115 and the electrode lead-out member 23, thereby further reducing the manufacturing difficulty of the battery cell 20.

[0280] According to some embodiments of this application, see Figure 5 , Figure 6 , Figure 7 and Figure 9 As shown, the wall portion 211 may also include an edge portion 211c, which protrudes from the outer peripheral surface of the body portion 211a and abuts against one end of the housing 212 where the opening 2122 is provided along the thickness direction X of the wall portion.

[0281] The edge portion 211c protrudes from the outer peripheral surface of the body portion 211a, that is, the edge portion 211c is a structure that is connected to the outer peripheral surface of the body portion 211a and protrudes from the outer peripheral surface of the body portion 211a radially.

[0282] The edge portion 211c abuts against the end of the housing 212 with the opening 2122 along the thickness direction X of the wall portion. That is, in the thickness direction X of the wall portion, the end face of the end of the housing 212 with the opening 2122 abuts against the edge portion 211c.

[0283] For example, in Figure 9 Along the thickness direction X of the wall portion, the first surface 2112 of the body portion 211a faces the electrode assembly 22. Correspondingly, the reinforcing portion 211b protrudes from the side of the body portion 211a facing the electrode assembly 22. The body portion 211a has a second surface 2119 facing away from the electrode assembly 22, and the surface of the edge portion 211c facing away from the housing 212 is coplanar with the second surface 2119.

[0284] In this embodiment, the wall portion 211 also has an edge portion 211c. By setting the edge portion 211c to be protruding on the outer peripheral surface of the body portion 211a and abutting against the end of the housing 212 with the opening 2122 along the thickness direction X of the wall portion, the body portion 211a and the housing 212 are welded together and the opening 2122 is closed. At the same time, the edge portion 211c can also play a certain limiting and positioning role for the body portion 211a. This helps to reduce the assembly difficulty between the end cap 213 and the housing 212 and improve the assembly quality between the end cap 213 and the housing 212.

[0285] In some embodiments, see Figure 7 , Figure 8 and Figure 9 As shown, the edge portion 211c is a ring structure that extends circumferentially along the body portion 211a. In other words, the edge portion 211c is a ring structure that extends circumferentially along the body portion 211a and is connected end to end.

[0286] It should be noted that in other embodiments, the edge portion 211c can also be other structures. For example, the edge portion 211c is a plurality of convex hull structures protruding from the outer peripheral surface of the body portion 211a, and the plurality of convex hull structures are arranged at intervals along the circumferential direction of the body portion 211a.

[0287] In this embodiment, by setting the edge portion 211c as an annular structure surrounding the outer side of the body portion 211a, the effect of the edge portion 211c in limiting and positioning the body portion 211a can be further improved. On the one hand, the assembly difficulty between the end cap 213 and the housing 212 can be further reduced, and the assembly quality between the end cap 213 and the housing 212 can be further improved. On the other hand, the sealing effect of the end cap 213 on the opening 2122 of the housing 212 can be improved, thereby reducing the risk of leakage of the battery cell 20 during use.

[0288] According to some embodiments of this application, please refer to Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the reinforcing portion 211b may include a first reinforcing portion 2113 and a second reinforcing portion 2115. An electrode lead-out hole 2111 is disposed in the first reinforcing portion 2113, and the second reinforcing portion 2115 is disposed around the first reinforcing portion 2113. The inner peripheral surface of the second reinforcing portion 2115 and the first surface 2112 together define a first groove 2116. The first reinforcing portion 2113 is located within the first groove 2116.

[0289] The electrode lead-out hole 2111 is provided in the first reinforcing part 2113, that is, the electrode lead-out hole 2111 is a structure that penetrates the first reinforcing part 2113 of the reinforcing part 211b.

[0290] The second reinforcing part 2115 is arranged around the first reinforcing part 2113, that is, the second reinforcing part 2115 is a ring structure surrounding the outside of the first reinforcing part 2113.

[0291] The inner peripheral surface of the second reinforcing part 2115 and the first surface 2112 together define the first groove 2116, and the first reinforcing part 2113 is located in the first groove 2116. That is, the first groove 2116 is formed on the side of the body part 211a facing the second reinforcing part 2115 and is located on the inner peripheral side of the second reinforcing part 2115.

[0292] In this embodiment, the reinforcing portion 211b includes a first reinforcing portion 2113 and a second reinforcing portion 2115 protruding from the first surface 2112. The second reinforcing portion 2115 surrounds the first reinforcing portion 2113, and the inner peripheral surface of the second reinforcing portion 2115 and the first surface 2112 together define a first groove 2116, such that the first reinforcing portion 2113 is a structure disposed on the bottom surface of the first groove 2116, and the electrode lead-out hole 2111 is disposed corresponding to the first reinforcing portion 2113, so that the electrode lead-out hole 2111 is disposed accordingly. 11 is a structure that sequentially penetrates the first surface 2112 and the first reinforcing part 2113. With this structure, the wall part 211 can realize that the first reinforcing part 2113 is located on the inner circumference of the second reinforcing part 2115, so that the second reinforcing part 2115 can play a certain protective role for the first reinforcing part 2113, which helps to reduce the impact and wear of the first reinforcing part 2113, thereby improving the stability and reliability of the first reinforcing part 2113 in strengthening the area of ​​the wall part 211 where the electrode lead-out hole 2111 is provided.

[0293] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, the first reinforcing part 2113 is connected to the groove side of the first groove 2116. That is, the first reinforcing part 2113 is located on the inner circumferential side of the second reinforcing part 2115 and is connected to the inner circumferential surface of the second reinforcing part 2115, so that the first reinforcing part 2113 is connected to both the first surface 2112 of the body part 211a and the inner circumferential surface of the second reinforcing part 2115.

[0294] In this embodiment, by setting the first reinforcing part 2113 to be connected to the groove side of the first groove 2116, the first reinforcing part 2113 and the second reinforcing part 2115 of the reinforcing part 211b are connected to form a whole, which is beneficial to improve the overall structural strength of the reinforcing part 211b, thereby improving the overall structural strength of the wall part 211, further strengthening the structural strength of the area of ​​the wall part 211 where the electrode lead-out hole 2111 is provided, and further mitigating the phenomenon of fatigue cracking or deformation collapse when the area of ​​the wall part 211 where the electrode lead-out hole 2111 is provided is subjected to tension or external impact during use, so as to further reduce the risk of the battery cell 20 bursting and being damaged during use.

[0295] According to some embodiments of this application, please continue to refer to Figure 7 and Figure 8As shown, there are multiple first reinforcing parts 2113, which are arranged at intervals along the first direction Y within the first groove 2116, and each electrode lead-out hole 2111 is correspondingly disposed on one first reinforcing part 2113. The groove side of the first groove 2116 includes a first side surface 2116a and a second side surface 2116b disposed opposite to each other in the second direction Z. Both the first side surface 2116a and the second side surface 2116b are connected to the first reinforcing part 2113, and the thickness direction X of the wall, the first direction Y, and the second direction Z are perpendicular to each other.

[0296] In this configuration, multiple first reinforcing portions 2113 are arranged at intervals along the first direction Y within the first groove 2116, and each electrode lead-out hole 2111 is correspondingly disposed in one first reinforcing portion 2113. That is, the multiple first reinforcing portions 2113 are arranged at intervals along the first direction Y and are all located on the inner circumferential side of the second reinforcing portion 2115. The first reinforcing portion 2113 is the portion of the reinforcing portion 211b used to reinforce the area where the electrode lead-out hole 2111 is disposed. Each electrode lead-out hole 2111 penetrates the corresponding first reinforcing portion 2113. Correspondingly, the first reinforcing portion 2113 is disposed around the corresponding electrode lead-out hole 2111, such that a portion of the electrode lead-out hole 2111 is located within the corresponding first reinforcing portion 2113.

[0297] The groove sides of the first groove 2116 include a first side 2116a and a second side 2116b disposed opposite to each other in the second direction Z. For example, the orthographic projection of the second reinforcing part 2115 in the thickness direction X of the wall is rectangular, so that the first groove 2116 is a rectangular groove structure. Correspondingly, the first side 2116a and the second side 2116b are two groove sides of the first groove 2116 disposed facing in the second direction Z, and are also two side surfaces disposed facing in the second direction Z in the inner peripheral surface of the second reinforcing part 2115.

[0298] The wall portion 211 is rectangular, with its length direction being the first direction Y and its width direction being the second direction Z. Correspondingly, the orthographic projection of the first groove 2116 onto a projection plane perpendicular to the thickness direction X of the wall portion is rectangular, with the length direction of the first groove 2116 being the first direction Y and the width direction of the first groove 2116 being the second direction Z.

[0299] Both the first side surface 2116a and the second side surface 2116b are connected to the first reinforcing part 2113. That is, the first reinforcing part 2113 is connected to both sides of the groove 2116 facing the first groove in the second direction Z.

[0300] In this embodiment, the reinforcing part 211b is provided with a plurality of first reinforcing parts 2113 arranged at intervals along the first direction Y in the first groove 2116, and the first reinforcing parts 2113 connect the first side surface 2116a and the second side surface 2116b of the first groove 2116 opposite to each other in the second direction Z, so as to further improve the overall structural strength of the reinforcing part 211b, thereby further improving the structural strength of the area of ​​the wall part 211 where the electrode lead-out hole 2111 is provided, so as to alleviate the phenomenon of fatigue cracking or deformation collapse when the area of ​​the wall part 211 where the electrode lead-out hole 2111 is provided is subjected to external impact or expansion of the battery cell 20 during use.

[0301] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, the first reinforcing part 2113 includes a main body region 2113a and a plurality of connecting ribs 2113b. An electrode lead-out hole 2111 is disposed in the main body region 2113a, and the plurality of connecting ribs 2113b are arranged at intervals along the circumference of the main body region 2113a. The first side surface 2116a and the second side surface 2116b are both connected to the main body region 2113a through at least one connecting rib 2113b.

[0302] In the projection plane perpendicular to the thickness direction X of the wall, the area of ​​the orthographic projection of the main body region 2113a is greater than the area of ​​the orthographic projection of the connecting rib 2113b.

[0303] Electrode lead-out hole 2111 is provided in the main body region 2113a, that is, the electrode lead-out hole 2111 is a structure provided in the main body region 2113a corresponding to the first reinforcing part 2113. In other words, the electrode lead-out hole 2111 is a structure that penetrates the main body region 2113a of the corresponding first reinforcing part 2113 along the thickness direction X of the wall portion, and the main body region 2113a of the first reinforcing part 2113 is a structure that surrounds the corresponding electrode lead-out hole 2111.

[0304] Multiple connecting ribs 2113b are arranged at intervals along the circumference of the main body area 2113a, that is, the multiple connecting ribs 2113b are a structure that surrounds the main body area 2113a, and the multiple connecting ribs 2113b are all connected to the outer circumferential surface of the main body area 2113a.

[0305] For example, the orthographic projection of the main body region 2113a in the projection plane perpendicular to the thickness direction X of the wall is rectangular, and the connecting ribs 2113b are strip-shaped structures. Correspondingly, some of the connecting ribs 2113b arranged circumferentially along the main body region 2113a are structures that extend along the first direction Y, and the other part of the connecting ribs 2113b are structures that extend along the second direction Z.

[0306] Both the first side 2116a and the second side 2116b are connected to the main body area 2113a by at least one connecting rib 2113b. That is, the first side 2116a is a structure that is connected to the main body area 2113a by at least one connecting rib 2113b, so as to realize the connection between the first reinforcing part 2113 and the first side 2116a. Similarly, the second side 2116b is a structure that is connected to the main body area 2113a by at least one connecting rib 2113b, so as to realize the connection between the first reinforcing part 2113 and the second side 2116b.

[0307] Optionally, the first side 2116a may be connected to the main body area 2113a by a connecting rib 2113b or by multiple connecting ribs 2113b. Similarly, the second side 2116b may be connected to the main body area 2113a by a connecting rib 2113b or by multiple connecting ribs 2113b.

[0308] In this embodiment, the first reinforcing part 2113 is provided with a main body area 2113a and a plurality of connecting ribs 2113b surrounding the main body area 2113a. The electrode lead-out hole 2111 is provided on the main body area 2113a, and the first side surface 2116a and the second side surface 2116b are both connected to the main body area 2113a through at least one connecting rib 2113b, so as to realize that the first reinforcing part 2113 connects the first side surface 2116a and the second side surface 2116b opposite to each other in the second direction Z. The first reinforcing part 2113 with this structure can further improve the overall structural strength of the reinforcing part 211b, which is conducive to further improving the structural strength of the area where the electrode lead-out hole 2111 is provided in the wall part 211.

[0309] In some embodiments, see Figure 8 As shown, the width of the connecting rib 2113b is W1, which satisfies 0.5mm≤W1≤3mm.

[0310] Wherein, the connecting rib 2113b is a strip-shaped structure, and correspondingly, the width W1 of the connecting rib 2113b is: the width dimension of the connecting rib 2113b perpendicular to its extension direction in a plane perpendicular to the thickness direction X of the wall. If the connecting rib 2113b is a strip-shaped structure extending along the first direction Y, then W1 is the width dimension of the connecting rib 2113b in the second direction Z; if the connecting rib 2113b is a strip-shaped structure extending along the second direction Z, then W1 is the width dimension of the connecting rib 2113b in the first direction Y.

[0311] For example, the width W1 of the connecting rib 2113b can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, etc.

[0312] In this embodiment, the width of the connecting rib 2113b is 0.5mm to 3mm. On the one hand, setting the width of the connecting rib 2113b to be greater than or equal to 0.5mm is beneficial to further enhance the strengthening effect of the connecting rib 2113b on the overall structural strength of the wall portion 211, so as to alleviate the phenomenon of fatigue cracking or deformation collapse in the area of ​​the wall portion 211 where the electrode lead-out hole 2111 is provided during use. On the other hand, setting the width of the connecting rib 2113b to be less than or equal to 3mm saves the space occupied by the connecting rib 2113b and can reduce the molding difficulty of the connecting rib 2113b.

[0313] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, the reinforcing portion 211b may further include a plurality of third reinforcing portions 2117 arranged at intervals along the first direction Y. The third reinforcing portions 2117 are located within the first groove 2116, and the second reinforcing portion 2115 extends along the second direction Z. Along the first direction Y, the first reinforcing portion 2113 and the third reinforcing portion 2117 are alternately arranged, and every two adjacent third reinforcing portions 2117 are connected through the first reinforcing portion 2113.

[0314] The reinforcing part 211b may further include a plurality of third reinforcing parts 2117 arranged at intervals along the first direction Y, and the third reinforcing parts 2117 extend along the second direction Z, that is, the third reinforcing parts 2117 are strip-shaped structures extending along the second direction Z.

[0315] The third reinforcing part 2117 is located inside the first groove 2116, that is, the multiple third reinforcing parts 2117 are also arranged on the inner periphery of the second reinforcing part 2115, so that the second reinforcing part 2115 surrounds the outer side of the multiple third reinforcing parts 2117.

[0316] Along the first direction Y, the first reinforcing part 2113 and the third reinforcing part 2117 are alternately arranged, and each two adjacent third reinforcing parts 2117 are connected through the first reinforcing part 2113. That is, in the first direction Y, a third reinforcing part 2117 is arranged between each two adjacent first reinforcing parts 2113, and a first reinforcing part 2113 is arranged between each two adjacent third reinforcing parts 2117. The alternately arranged first reinforcing parts 2113 and third reinforcing parts 2117 are connected in sequence.

[0317] For example, in Figure 8 In the middle, the reinforcing portion 211b includes three first reinforcing portions 2113 and four third reinforcing portions 2117 arranged at intervals along the first direction Y, and a first reinforcing portion 2113 is connected between every two adjacent third reinforcing portions 2117 in the first direction Y. Correspondingly, in an embodiment where each electrode lead-out hole 2111 is correspondingly provided with a first reinforcing portion 2113, the multiple electrode lead-out holes 2111 provided on the wall portion 211 are structured to be separated by the third reinforcing portions 2117. For example, in Figure 8 In the middle, the wall portion 211 is provided with two electrode lead-out holes 2111 and one liquid injection hole 2114. The liquid injection hole 2114 is located between the two electrode lead-out holes 2111 in the first direction Y. Along the first direction Y, there is one electrode lead-out hole 2111 or one liquid injection hole 2114 between every two adjacent third reinforcing portions 2117.

[0318] In this embodiment, the reinforcing part 211b is further provided with a plurality of third reinforcing parts 2117 arranged at intervals along the first direction Y in the first groove 2116, and the third reinforcing parts 2117 extend along the second direction Z. By setting the first reinforcing parts 2113 and the third reinforcing parts 2117 to be arranged alternately in the first direction Y, and each pair of adjacent third reinforcing parts 2117 are connected by the first reinforcing parts 2113, the plurality of first reinforcing parts 2113 of the reinforcing part 211b can be connected into a whole, which is beneficial to further improve the strengthening effect of the structural strength of the wall part 211. In this way, it can further alleviate the phenomenon of fatigue cracking or deformation collapse in the area of ​​the wall part 211 where the electrode lead-out hole 2111 is provided during use when subjected to external impact or expansion of the battery cell 20, so as to further reduce the risk of the battery cell 20 bursting and being damaged during use.

[0319] According to some embodiments of this application, please continue to refer to Figure 7 and Figure 8As shown, the first reinforcing part 2113 includes a main body region 2113a and a plurality of connecting ribs 2113b. An electrode lead-out hole 2111 is disposed in the main body region 2113a, and the plurality of connecting ribs 2113b are arranged at intervals along the circumference of the main body region 2113a. Along the first direction Y, each pair of adjacent third reinforcing parts 2117 are connected to the main body region 2113a through at least one connecting rib 2113b.

[0320] Each pair of adjacent third reinforcing parts 2117 is connected to the main body region 2113a by at least one connecting rib 2113b. In other words, each of the two third reinforcing parts 2117 adjacent to the first reinforcing part 2113 has a structure that is connected to the main body region 2113a of the corresponding first reinforcing part 2113 by at least one connecting rib 2113b, so as to realize the connection between the first reinforcing part 2113 and the two adjacent third reinforcing parts 2117.

[0321] Optionally, the third reinforcing part 2117 may be connected to the main body area 2113a of the corresponding first reinforcing part 2113 via a connecting rib 2113b, or it may be connected to the main body area 2113a of the corresponding first reinforcing part 2113 via multiple connecting ribs 2113b.

[0322] In this embodiment, the first reinforcing part 2113 is provided with a main body area 2113a and a plurality of connecting ribs 2113b surrounding the main body area 2113a. The electrode lead-out hole 2111 is provided on the main body area 2113a, and two adjacent third reinforcing parts 2117 are connected to the main body area 2113a through at least one connecting rib 2113b, so that the first reinforcing part 2113 is connected to the two adjacent third reinforcing parts 2117 in the first direction Y. The first reinforcing part 2113 with this structure can further improve the overall structural strength of the reinforcing part 211b, which is beneficial to further improve the structural strength of the area of ​​the wall part 211 where the electrode lead-out hole 2111 is provided.

[0323] In some embodiments, see Figure 8 As shown, along the second direction Z, the two ends of the third reinforcing part 2117 are respectively connected to the first side surface 2116a and the second side surface 2116b. That is, the two opposite ends of the third reinforcing part 2117 in the second direction Z are respectively connected to the two groove sides of the first groove 2116 facing the second direction Z, so that the two opposite ends of the third reinforcing part 2117 in the second direction Z are both connected to the second reinforcing part 2115.

[0324] In this embodiment, by connecting the two ends of the third reinforcing part 2117 in the second direction Z to the first side surface 2116a and the second side surface 2116b of the first groove 2116 respectively, the reinforcing effect of the third reinforcing part 2117 on the overall structural strength of the wall part 211 can be improved, and the stability and reliability of the third reinforcing part 2117 protruding on the first surface 2112 of the body part 211a can be improved.

[0325] According to some embodiments of this application, see Figure 8 As shown, along the first direction Y, the width of the third reinforcing part 2117 is W2, which satisfies 0.5mm≤W2≤3mm.

[0326] The width of the third reinforcing part 2117 in the first direction Y is W2, that is, W2 is the width dimension of the third reinforcing part 2117 in the plane perpendicular to the thickness direction X of the wall part in the direction perpendicular to its extension.

[0327] For example, the width W2 of the third reinforcing part 2117 in the first direction Y can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, etc.

[0328] In this embodiment, the width of the third reinforcing part 2117 in the first direction Y is 0.5mm to 3mm. On the one hand, setting the width of the third reinforcing part 2117 in the first direction Y to be greater than or equal to 0.5mm is beneficial to further enhance the reinforcing effect of the third reinforcing part 2117 on the overall structural strength of the wall part 211, so as to alleviate the phenomenon of fatigue cracking or deformation damage of the wall part 211 during use. On the other hand, setting the width of the third reinforcing part 2117 in the first direction Y to be less than or equal to 3mm saves the space occupied by the third reinforcing part 2117 in the first direction Y, and can reduce the molding difficulty of the third reinforcing part 2117.

[0329] According to some embodiments of this application, please refer to Figure 7 and Figure 8As shown, the groove side of the first groove 2116 also includes a third side surface 2116c and a fourth side surface 2116d disposed opposite each other in the first direction Y. A plurality of third reinforcing portions 2117 are located between the third side surface 2116c and the fourth side surface 2116d in the first direction Y. The reinforcing portion 211b also includes a plurality of fourth reinforcing portions 2118, which are located within the first groove 2116 and extend along the first direction Y. Along the first direction Y, the third reinforcing portion 2117 closest to the third side surface 2116c among the plurality of third reinforcing portions 2117 is connected to the third side surface 2116c through at least one fourth reinforcing portion 2118, and the third reinforcing portion 2117 closest to the fourth side surface 2116d among the plurality of third reinforcing portions 2117 is connected to the fourth side surface 2116d through at least one fourth reinforcing portion 2118.

[0330] The groove side of the first groove 2116 also includes a third side 2116c and a fourth side 2116d disposed opposite to each other in the first direction Y. For example, the first groove 2116 is a rectangular groove structure. Correspondingly, the third side 2116c and the fourth side 2116d are two groove side surfaces of the first groove 2116 disposed facing each other in the first direction Y, and are also two side surfaces of the inner peripheral surface of the second reinforcing part 2115 disposed facing each other in the first direction Y.

[0331] It should be noted that in embodiments where the side surface of the first groove 2116 also includes a first side surface 2116a and a second side surface 2116b arranged opposite each other along the second direction Z, the first side surface 2116a, the third side surface 2116c, the second side surface 2116b, and the fourth side surface 2116d are connected end to end in sequence. Correspondingly, the first side surface 2116a, the third side surface 2116c, the second side surface 2116b, and the fourth side surface 2116d are connected end to end in sequence to form the inner peripheral surface of the second reinforcing part 2115. Optionally, the first side surface 2116a and the third side surface 2116c... The structures between the third side 2116c and the second side 2116b, between the second side 2116b and the fourth side 2116d, and between the fourth side 2116d and the first side 2116a can be directly connected or indirectly connected. In the embodiments of this application, the structures between the first side 2116a and the third side 2116c, between the third side 2116c and the second side 2116b, between the second side 2116b and the fourth side 2116d, and between the fourth side 2116d and the first side 2116a are all connected by rounded corner surfaces.

[0332] Multiple third reinforcing parts 2117 are located between the third side surface 2116c and the fourth side surface 2116d in the first direction Y. That is, the multiple third reinforcing parts 2117 are arranged at intervals between the third side surface 2116c and the fourth side surface 2116d along the first direction Y, and the third side surface 2116c and the fourth side surface 2116d are both spaced apart from the third reinforcing parts 2117.

[0333] The fourth reinforcing part 2118 is located inside the first groove 2116, that is, the fourth reinforcing part 2118 is a structure located on the inner periphery of the second reinforcing part 2115, so that the second reinforcing part 2115 is also a structure surrounding the outer side of the fourth reinforcing part 2118.

[0334] Along the first direction Y, the third reinforcing part 2117 closest to the third side 2116c among the plurality of third reinforcing parts 2117 is connected to the third side 2116c through at least one fourth reinforcing part 2118, and the third reinforcing part 2117 closest to the fourth side 2116d among the plurality of third reinforcing parts 2117 is connected to the fourth side 2116d through at least one fourth reinforcing part 2118. That is to say, the two third reinforcing parts 2117 located on both sides of the plurality of third reinforcing parts 2117 in the first direction Y are respectively connected to the third side 2116c and the fourth side 2116d through at least one fourth reinforcing part 2118.

[0335] For example, in Figure 8 In this configuration, the third reinforcing part 2117 closest to the third side surface 2116c among the plurality of third reinforcing parts 2117 is connected to the third side surface 2116c via a fourth reinforcing part 2118, and the third reinforcing part 2117 closest to the fourth side surface 2116d among the plurality of third reinforcing parts 2117 is connected to the fourth side surface 2116d via a fourth reinforcing part 2118. Of course, in other embodiments, the third reinforcing part 2117 closest to the third side surface 2116c among the plurality of third reinforcing parts 2117 may also be connected to the third side surface 2116d via a plurality of fourth reinforcing parts 2118. The three sides 2116c are connected, and the multiple fourth reinforcing parts 2118 located between the third side 2116c and the corresponding third reinforcing part 2117 are arranged at intervals along the second direction Z. Similarly, the third reinforcing part 2117 closest to the fourth side 2116d among the multiple third reinforcing parts 2117 can also be connected to the fourth side 2116d through the multiple fourth reinforcing parts 2118, and the multiple fourth reinforcing parts 2118 located between the fourth side 2116d and the corresponding third reinforcing part 2117 are arranged at intervals along the second direction Z.

[0336] In this embodiment, the reinforcing part 211b is further provided with a plurality of fourth reinforcing parts 2118. By setting the third reinforcing part 2117 closest to the third side 2116c among the plurality of third reinforcing parts 2117 arranged at intervals along the first direction Y to be connected to the third side 2116c through at least one fourth reinforcing part 2118, and setting the third reinforcing part 2117 closest to the fourth side 2116d among the plurality of third reinforcing parts 2117 arranged at intervals along the first direction Y to be connected to the fourth side 2116d through at least one fourth reinforcing part 2118, it is possible to connect the two third reinforcing parts 2117 located on both sides in the first direction Y with the second reinforcing part 2115 to form a whole. This is beneficial to further enhance the structural strength of the wall part 211, so as to further alleviate the phenomenon of fatigue cracking or deformation damage when the wall part 211 is subjected to external impact or expansion of the battery cell 20 during use, thereby further reducing the risk of the battery cell 20 bursting during use, and further improving the stability and reliability of the battery cell 20.

[0337] According to some embodiments of this application, see Figure 8 As shown, along the second direction Z, the width of the fourth reinforcing part 2118 is W3, which satisfies 0.5mm≤W3≤3mm.

[0338] The width of the fourth reinforcing part 2118 in the second direction Z is W3, that is, W3 is the width dimension of the fourth reinforcing part 2118 in the plane perpendicular to the thickness direction X of the wall part in the direction perpendicular to its extension.

[0339] For example, the width W3 of the fourth reinforcing part 2118 in the second direction Z can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, etc.

[0340] In this embodiment, the width of the fourth reinforcing part 2118 in the second direction Z is 0.5mm to 3mm. On the one hand, setting the width of the fourth reinforcing part 2118 in the second direction Z to be greater than or equal to 0.5mm is beneficial to further improve the overall structural strength of the reinforcing part 211b, so as to further improve the strengthening effect on the structural strength of the wall part 211. On the other hand, setting the width of the fourth reinforcing part 2118 in the second direction Z to be less than or equal to 3mm saves the space occupied by the fourth reinforcing part 2118 in the second direction Z, and can reduce the molding difficulty of the fourth reinforcing part 2118.

[0341] According to some embodiments of this application, see Figure 3 and Figure 4 as well as Figure 7 and Figure 8 As shown, in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the wall portion 211 is rectangular, and the dimension of the orthographic projection of the wall portion 211 in the first direction Y is greater than the dimension of the orthographic projection of the wall portion 211 in the second direction Z. Correspondingly, in the projection plane perpendicular to the thickness direction X of the wall portion, the length direction of the orthographic projection of the wall portion 211 is the first direction Y, and the width direction of the orthographic projection of the wall portion 211 is the second direction Z. That is to say, the wall portion 211 is a rectangular plate-like structure, and correspondingly, the first direction Y is the length direction of the wall portion 211, and the second direction Z is the width direction of the wall portion 211.

[0342] In this embodiment, by setting the projection of the wall portion 211 on the thickness direction X of the wall portion as a rectangular structure, and the length direction of the wall portion 211 is the arrangement direction of the plurality of first reinforcing portions 2113, the battery cell 20 with this structure can reduce the difficulty of protruding the plurality of first reinforcing portions 2113 arranged at intervals along the first direction Y on the first surface 2112, and can improve the strengthening effect of the plurality of first reinforcing portions 2113 on the overall structural strength of the wall portion 211.

[0343] According to some embodiments of this application, see Figure 7 , Figure 8 and Figure 9 As shown, along the thickness direction X of the wall, the thickness of the first reinforcing part 2113 protruding from the first surface 2112 is T2, and the thickness of the second reinforcing part 2115 protruding from the first surface 2112 is T3, satisfying that T2 < T3.

[0344] Wherein, T2 is the thickness dimension of the first reinforcing part 2113 protruding on the first surface 2112 in the thickness direction X of the wall portion, T3 is the thickness dimension of the second reinforcing part 2115 protruding on the first surface 2112 in the thickness direction X of the wall portion, and is also the groove depth of the first groove 2116 formed by the inner peripheral surfaces of the first surface 2112 and the second reinforcing part 2115 of the body portion 211a in the thickness direction X of the wall portion.

[0345] T2 < T3, meaning that the thickness of the first reinforcing part 2113 in the thickness direction X of the wall is less than the thickness of the second reinforcing part 2115 in the thickness direction X of the wall. In other words, the first reinforcing part 2113 does not extend beyond the end face of the second reinforcing part 2115 away from the body part 211a in the thickness direction X of the wall. That is, the first reinforcing part 2113 does not extend the first groove 2116 in the thickness direction X of the wall, so that the first reinforcing part 2113 is a structure in which the entire first reinforcing part 2113 is located within the first groove 2116.

[0346] It should be noted that in the embodiment where the first reinforcing part 2113 includes a main body region 2113a and a connecting rib 2113b, if the thickness of the main body region 2113a in the thickness direction X of the wall is greater than or equal to the thickness of the connecting rib 2113b in the thickness direction X of the wall, then the thickness T1 of the main body region 2113a in the thickness direction X of the wall is the thickness T2 of the first reinforcing part 2113 in the thickness direction X of the wall, that is, T1 and T2 are equal; if the thickness of the main body region 2113a in the thickness direction X of the wall is less than the thickness of the connecting rib 2113b in the thickness direction X of the wall, then the thickness of the connecting rib 2113b in the thickness direction X of the wall is the thickness T2 of the first reinforcing part 2113 in the thickness direction X of the wall, correspondingly, the thickness T1 of the main body region 2113a in the thickness direction X of the wall is less than the thickness T2 of the first reinforcing part 2113 in the thickness direction X of the wall.

[0347] For example, in the embodiments of this application, the thickness of the main body region 2113a in the thickness direction X of the wall is equal to the thickness of the connecting rib 2113b in the thickness direction X of the wall, and correspondingly, T1 and T2 are equal.

[0348] In this embodiment, by setting the thickness of the first reinforcing part 2113 to be less than the thickness of the second reinforcing part 2115, the first reinforcing part 2113 is structured such that it does not extend beyond the second reinforcing part 2115 in the thickness direction X of the wall portion, that is, the first reinforcing part 2113 does not extend beyond the first groove 2116 in the thickness direction X of the wall portion, so that the first reinforcing part 2113 is entirely accommodated within the first groove 2116. This reduces the interference between the first reinforcing part 2113 with the electrode lead-out hole 2111 and other components inside the battery cell 20, and facilitates the assembly of the electrode lead-out member 23 at the electrode lead-out hole 2111, which helps to reduce the assembly difficulty of the electrode lead-out member 23. Furthermore, the first groove 2116 can also provide a certain degree of protection for the first reinforcing part 2113, thereby reducing the wear and tear on the first reinforcing part 2113 during use.

[0349] In some embodiments, please continue to see Figure 7 , Figure 8 and Figure 9 As shown, T2≥0.15T3, that is, the thickness dimension of the first reinforcing part 2113 in the thickness direction X of the wall is 0.15 times or more of the thickness dimension of the second reinforcing part 2115 in the thickness direction X of the wall.

[0350] For example, T2 can be 0.15 times, 0.16 times, 0.17 times, 0.18 times, 0.19 times, 0.2 times, 0.21 times, 0.22 times, 0.23 times, 0.24 times, 0.25 times, 0.28 times, 0.3 times, 0.32 times, 0.35 times, 0.38 times, 0.4 times, 0.45 times, 0.5 times, 0.55 times, 0.6 times, 0.65 times, 0.7 times, 0.75 times, 0.8 times, 0.85 times, 0.9 times, 0.95 times, or 1 times of T3.

[0351] In this embodiment, by setting the thickness of the first reinforcing part 2113 to be greater than or equal to 0.15 times the thickness of the second reinforcing part 2115, it is beneficial to improve the structural strength of the first reinforcing part 2113 itself, so that the first reinforcing part 2113 has sufficient thickness and strength to strengthen the area of ​​the wall part 211 where the electrode lead-out hole 2111 is provided, thereby effectively improving the strengthening effect on the structural strength of the area of ​​the wall part 211 where the electrode lead-out hole 2111 is provided.

[0352] In some embodiments, see Figure 9 As shown, 0.2mm≤T2≤2mm.

[0353] For example, T2 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm, etc.

[0354] In this embodiment, by setting the size of the first reinforcing part 2113 protruding from the first surface 2112 in the thickness direction X of the wall to 0.2mm to 2mm, the thickness of the first reinforcing part 2113 in the thickness direction X of the wall is 0.2mm to 2mm. On the one hand, setting the thickness of the first reinforcing part 2113 to be greater than or equal to 0.2mm can improve the structural strength of the first reinforcing part 2113 itself, so that the first reinforcing part 2113 has sufficient thickness and strength to strengthen the area of ​​the wall 211 where the electrode lead-out hole 2111 is provided, which is beneficial to improving the structural strength of the area of ​​the wall 211 where the electrode lead-out hole 2111 is provided. On the other hand, setting the thickness of the first reinforcing part 2113 to be less than or equal to 2mm can reduce the height of the first reinforcing part 2113 protruding from the first surface 2112, thereby reducing the space occupied by the first reinforcing part 2113 in the thickness direction X of the wall, and facilitating the assembly of the electrode lead-out member 23 at the electrode lead-out hole 2111, which is beneficial to reducing the assembly difficulty of the electrode lead-out member 23.

[0355] In some embodiments, see Figure 9As shown, 0.2mm≤T3≤3mm.

[0356] For example, T3 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, etc.

[0357] In this embodiment, by setting the size of the second reinforcing part 2115 protruding from the first surface 2112 in the thickness direction X of the wall to be 0.2mm to 3mm, the thickness of the second reinforcing part 2115 in the thickness direction X of the wall is 0.2mm to 3mm. On the one hand, setting the thickness of the second reinforcing part 2115 to be greater than or equal to 0.2mm can improve the structural strength of the second reinforcing part 2115 itself, thereby enhancing the strengthening effect of the second reinforcing part 2115 on the overall structural strength of the wall 211, which is beneficial to reducing the risk of cracking or deformation and collapse of the wall 211 during use. On the other hand, setting the thickness of the second reinforcing part 2115 to be less than or equal to 3mm can reduce the height of the second reinforcing part 2115 protruding from the first surface 2112, thereby reducing the space occupied by the second reinforcing part 2115 in the thickness direction X of the wall, and reducing the interference between the second reinforcing part 2115 and other components.

[0358] According to some embodiments of this application, see Figure 7 , Figure 8 and Figure 9 As shown, along the thickness direction X of the wall portion, the side of the main body portion 211a away from the reinforcing portion 211b also has a second surface 2119. The distance between the second surface 2119 and the first surface 2112 is D. The thickness of the second reinforcing portion 2115 protruding from the first surface 2112 is T3, which satisfies 0.05≤T3 / (T3+D)≤0.875.

[0359] Wherein, the first surface 2112 and the second surface 2119 are respectively the two sides of the body portion 211a in its thickness direction. For example, in the embodiment of this application, the first surface 2112 is the inner surface of the body portion 211a facing the electrode assembly 22 in the thickness direction X of the wall portion, that is, the reinforcing part 211b protrudes on the side of the body portion 211a facing the electrode assembly 22. Correspondingly, the second surface 2119 is the outer surface of the body portion 211a away from the electrode assembly 22 in the thickness direction X of the wall portion.

[0360] Along the thickness direction X of the wall portion, the distance between the second surface 2119 and the first surface 2112 is D. That is, the thickness dimension of the body portion 211a in the thickness direction X of the wall portion is D, where 0.05≤T3 / (T3+D)≤0.875. That is, in the thickness direction X of the wall portion, the thickness of the second reinforcing portion 2115 is 0.05 to 0.875 times the sum of the thickness of the second reinforcing portion 2115 and the thickness of the body portion 211a. In other words, the thickness of the second reinforcing portion 2115 is 0.05 to 0.875 times the thickness of the entire wall portion 211. Similarly, the groove depth of the first groove 2116 in the thickness direction X of the wall portion is equivalent to 0.05 to 0.875 times the thickness of the entire wall portion 211.

[0361] For example, T3 / (T3+D) can be 0.05, 0.06, 0.08, 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, 0.4, 0.42, 0.45, 0.48, 0.5, 0.52, 0.55, 0.58, 0.6, 0.62, 0.65, 0.68, 0.7, 0.72, 0.75, 0.78, 0.8, 0.81, 0.82, 0.85, 0.86, 0.87, or 0.875, etc.

[0362] In this embodiment, by setting the thickness of the second reinforcing part 2115 to 0.05 to 0.875 of the sum of the distance between the first surface 2112 and the second surface 2119 and the thickness of the second reinforcing part 2115, the thickness of the second reinforcing part 2115 accounts for 0.05 to 0.875 of the total wall thickness of the wall part 211. On the one hand, the second reinforcing part 2115 strengthens the overall structural strength of the wall part 211, thereby improving the overall structural strength of the wall part 211. On the other hand, it can alleviate the phenomenon that the structural strength of the body part 211a of the wall part 211 is weak due to the excessive space occupied by the second reinforcing part 2115. This is beneficial to improving the structural strength of the body part 211a of the wall part 211, thereby reducing the risk of deformation or cracking of the body part 211a during use.

[0363] In some embodiments, see Figure 9 As shown, 1mm≤D≤4mm.

[0364] For example, D can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, or 4mm, etc.

[0365] In this embodiment, by setting the distance between the first surface 2112 and the second surface 2119 to 1mm to 4mm, the wall thickness of the body portion 211a of the wall portion 211 is 1mm to 4mm. On the one hand, this can improve the structural strength of the body portion 211a and the overall structural strength of the wall portion 211, thereby reducing the risk of deformation or cracking of the body portion 211a during use. On the other hand, it can save the space occupied by the wall portion 211 and reduce the overall weight of the wall portion 211.

[0366] According to some embodiments of this application, see Figure 5 and Figure 6 As shown, along the thickness direction X of the wall portion, the first surface 2112 is disposed facing the electrode assembly 22. That is, the first surface 2112 is the inner surface of the body portion 211a facing the electrode assembly 22 in its thickness direction. Correspondingly, the reinforcing portion 211b protrudes from the side of the body portion 211a facing the electrode assembly 22.

[0367] It should be noted that in other embodiments, the first surface 2112 may also be the outer surface of the body portion 211a away from the electrode assembly 22, and correspondingly, the reinforcing portion 211b protrudes from the side of the body portion 211a away from the electrode assembly 22.

[0368] In this embodiment, the first surface 2112 is the surface of the body portion 211a facing the electrode assembly 22, so that the reinforcing portion 211b is a structure that protrudes from the body portion 211a on the side facing the electrode assembly 22. The battery cell 20 with this structure can reduce the accumulation of external impurities in the first groove 2116 formed by the second reinforcing portion 2115, and can realize that the reinforcing portion 211b is located inside the outer shell 21, which is beneficial to reduce the wear of the reinforcing portion 211b during use. On the other hand, it can realize that the first groove 2116 formed by the second reinforcing portion 2115 is connected to the internal space of the outer shell 21, thereby effectively utilizing the space in the first groove 2116 and improving the space utilization rate of the battery cell 20.

[0369] According to some embodiments of this application, refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 9 And further refer to Figure 10 and Figure 11 , Figure 10 This is a schematic diagram of the structure of the first insulating member 24 provided in some embodiments of this application. Figure 11This is an axial view of the first insulating member 24 provided in some embodiments of this application. The electrode lead-out member 23 includes a first connecting portion 231. The electrode assembly 22 includes a main body portion 221 and a tab 222. The tab 222 is connected to one end of the main body portion 221 facing the wall portion 211 in the thickness direction X, and is electrically connected to the first connecting portion 231. The battery cell 20 also includes a first insulating member 24, which is disposed within the housing 21, and at least a portion of the first insulating member 24 is located between the wall portion 211 and the first connecting portion 231. Along the thickness direction X of the wall portion, the first insulating member 24 has a third surface 241 facing away from the wall portion 211 and a fourth surface 242 facing the wall portion 211. The third surface 241 is provided with a second groove 2411, and the fourth surface 242 is formed with a first protrusion 2421 corresponding to the position of the second groove 2411. At least a portion of the first protrusion 2421 is accommodated in the first groove 2116, and at least a portion of the first connecting portion 231 and at least a portion of the tab 222 are both accommodated in the second groove 2411.

[0370] The tab 222 is connected to the end of the main body 221 facing the wall 211 in the thickness direction X of the wall. That is, the tab 222 is connected to the main body 221, and the tab 222 is located between the wall 211 and the main body 221 in the thickness direction X of the wall.

[0371] In this embodiment, the electrode lead-out member 23 serves to electrically connect to the electrode assembly 22, acting as the output or input electrode of the battery cell 20, thereby enabling the output or input of electrical energy from the battery cell 20.

[0372] The electrode lead-out member 23 includes a first connecting part 231, which is connected to the electrode tab 222. That is, part of the electrode lead-out member 23 is a structure that passes through the electrode lead-out hole 2111 of the wall part 211, and the part of the electrode lead-out member 23 that is connected to the electrode tab 222 of the electrode assembly 22 is the first connecting part 231.

[0373] For example, the first connecting portion 231 of the electrode lead-out member 23 is located on the side of the wall portion 211 facing the electrode assembly 22 in the thickness direction X of the wall portion. Of course, in other embodiments, the first connecting portion 231 may also be a structure that is only partially located on the side of the wall portion 211 facing the electrode assembly 22 in the thickness direction X of the wall portion. Correspondingly, the other part of the first connecting portion 231 may be a structure that is inserted into the electrode lead-out hole 2111 of the wall portion 211.

[0374] Optionally, the connection structure between the first connecting part 231 and the electrode 222 can be various, such as welding connection or abutment connection.

[0375] See Figure 6 and Figure 7As shown, an electrode lead-out hole 2111 is provided in the first region of the wall portion 211. The electrode lead-out hole 2111 penetrates the body portion 211a and the reinforcing portion 211b of the wall portion 211 along the thickness direction X. Correspondingly, a portion of the electrode lead-out member 23 is inserted into the electrode lead-out hole 2111, such that the electrode lead-out member 23 has a first connecting portion 231 located on the side of the wall portion 211 facing the electrode assembly 22.

[0376] For example, the electrode lead 23 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0377] exist Figure 3 , Figure 4 and Figure 7 In the battery cell 20, there are two electrode leads 23, and two electrode leads 2111 are provided on the first region of the wall portion 211. The two electrode leads 2111 are spaced apart on the wall portion 211 along the first direction Y. The two electrode leads 23 are respectively inserted into the two electrode leads 2111. Correspondingly, each electrode assembly 22 has two tabs 222. The two tabs 222 are connected to the end of the main body portion 221 facing the wall portion 211 in the thickness direction X of the wall portion. The two tabs 222 have opposite polarities and are spaced apart along the first direction Y. That is, the two tabs 222 are the positive tab and the negative tab of the electrode assembly 22, respectively. The two electrode leads 23 are electrically connected to the two tabs 222 of the electrode assembly 22, respectively, so as to realize the input or output of electrical energy of the battery cell 20.

[0378] In this embodiment of the application, a portion of the first insulating member 24 is disposed between the wall portion 211 and the first connecting portion 231 to serve as an insulating barrier between the wall portion 211 and the first connecting portion 231. A portion of the first insulating member 24 is disposed between the wall portion 211 and the tab 222, so that the first insulating member 24 can also serve as an insulating barrier between the wall portion 211 and the tab 222.

[0379] The third surface 241 is the surface of the first insulating member 24 facing the electrode assembly 22 in the thickness direction X of the wall portion, and correspondingly, the fourth surface 242 is the surface of the first insulating member 24 facing away from the electrode assembly 22 in the thickness direction X of the wall portion.

[0380] The third surface 241 is provided with a second groove 2411, and the fourth surface 242 is provided with a first protrusion 2421 corresponding to the position of the second groove 2411. That is, the surface of the first insulating member 24 facing the electrode assembly 22 is provided with a second groove 2411, and the surface of the first insulating member 24 away from the electrode assembly 22 is provided with a first protrusion 2421 corresponding to the position of the second groove 2411, so that the first insulating member 24 has a structure in which the second groove 2411 is formed on one side and the first protrusion 2421 is formed on the other side.

[0381] At least a portion of the first protrusion 2421 is accommodated within the first groove 2116. That is, at least a portion of the first protrusion 2421 protruding from the fourth surface 242 of the first insulating member 24 is inserted into the first groove 2116 along the thickness direction X of the wall portion, such that the second reinforcing portion 2115 is a structure surrounding the outside of at least a portion of the first protrusion 2421. Correspondingly, the first reinforcing portion 2113 and the first protrusion 2421 are arranged along the thickness direction X of the wall portion.

[0382] For example, in the embodiments of this application, the first protrusion 2421 is inserted into the first groove 2116 along the thickness direction X of the wall portion, and a portion of the first reinforcing portion 2113 abuts against the first protrusion 2421 along the thickness direction X of the wall portion.

[0383] At least a portion of the first connecting portion 231 and at least a portion of the tab 222 are both accommodated in the second groove 2411. That is, the first connecting portion 231 of the electrode lead-out member 23 and the electrode assembly 22 are both located on the side of the first insulating member 24 away from the wall portion 211, and at least a portion of the first connecting portion 231 is inserted into the second groove 2411 provided on the third surface 241 of the first insulating member 24 along the thickness direction X of the wall portion, and at least a portion of the tab 222 is inserted into the second groove 2411 provided on the third surface 241 of the first insulating member 24 along the thickness direction X of the wall portion.

[0384] It should be noted that, in combination Figure 4 , Figure 6 , Figure 7 , Figure 10 and Figure 11 As shown, in an embodiment where the battery cell 20 is provided with two electrode leads 23 and the electrode assembly 22 is provided with two tabs 222, the first insulating member 24 is provided with two second grooves 2411 and two first protrusions 2421. Each second groove 2411 is used to accommodate at least a portion of the first connecting portion 231 of an electrode lead 23 and at least a portion of a tab 222, and both first protrusions 2421 are inserted into the first groove 2116 along the thickness direction X of the wall.

[0385] In this embodiment, a second groove 2411 is provided on the third surface 241 of the first insulating member 24 facing away from the wall portion 211, and a first protrusion 2421 is provided on the fourth surface 242 of the first insulating member 24 facing the wall portion 211 and corresponding to the position of the second groove 2411. By setting at least a portion of the first protrusion 2421 to be accommodated in the first groove 2116, and setting at least a portion of the first connecting portion 231 and at least a portion of the electrode tab 222 to be accommodated in the second groove 2411, the structure is such that while satisfying the effect of the first insulating member 24 insulating and isolating the electrode tab 222 and the wall portion 211, as well as the effect of the first connecting portion 231 and the wall portion 211, the first insulating member 24 and the second reinforcing portion can also be integrated. 2115 shares a portion of space in the thickness direction X of the wall portion, and while ensuring sufficient space between the first insulating member 24 and the main body portion 221 to accommodate the first connecting portion 231 and the electrode tab 222, it also enables the first insulating member 24 and the first connecting portion 231, as well as the first insulating member 24 and the electrode tab 222, to share a portion of space in the thickness direction X of the wall portion. This reduces the phenomenon of the first insulating member 24 pressing down on the electrode tab 222 and satisfies the insulation isolation effect between the electrode tab 222 and the wall portion 211, while effectively increasing the internal space of the battery cell 20 for accommodating the electrode assembly 22. This is beneficial to improving the internal space utilization rate of the battery cell 20 and thus increasing the volumetric energy density of the battery cell 20.

[0386] According to some embodiments of this application, see Figure 6 and Figure 11 As shown, a limiting part 243 is protruding from the bottom surface of the second groove 2411, and the limiting part 243 surrounds the outer periphery of the first connecting part 231.

[0387] In this embodiment, the limiting part 243 and the first insulating member 24 are integrally formed. Of course, in other embodiments, the limiting part 243 and the first insulating member 24 can also be separate structures. The limiting part 243 can be connected to the bottom surface of the second groove 2411 by bonding or snap-fitting. Exemplarily, in this embodiment, the first insulating member 24 is formed by injection molding.

[0388] The limiting part 243 surrounds the outer periphery of the first connecting part 231, that is, the limiting part 243 is a structure that surrounds the first connecting part 231. Optionally, the limiting part 243 can be a variety of structures. For example, the limiting part 243 can be an annular structure that surrounds the first connecting part 231 and is connected end to end. Of course, the limiting part 243 can also include multiple convex hull structures that are arranged at intervals along the circumference of the first connecting part 231, and the multiple convex hull structures surround the first connecting part 231.

[0389] In this embodiment, by providing a limiting part 243 protruding from the bottom surface of the second groove 2411, and the limiting part 243 being a structure surrounding the first connecting part 231, the limiting part 243 can play a certain limiting and positioning role for the first connecting part 231. On the one hand, it can reduce the shaking phenomenon of the first connecting part 231 during use, which is conducive to improving the stability of the first connecting part 231 in the second groove 2411. On the other hand, it can reduce the difficulty of assembling at least part of the first connecting part 231 into the second groove 2411, thereby reducing the assembly difficulty between the first insulating member 24 and the electrode lead-out member 23, which is conducive to improving the assembly efficiency of the battery cell 20.

[0390] According to some embodiments of this application, see Figure 11 As shown, the limiting part 243 is a ring structure that extends circumferentially along the first connecting part 231. In other words, the limiting part 243 is a ring structure that surrounds the first connecting part 231 and is connected end to end.

[0391] In this embodiment, by setting the limiting part 243 as an annular structure surrounding the first connecting part 231, the effect of the limiting part 243 in limiting and positioning the first connecting part 231 can be further improved, and the difficulty of protruding the limiting part 243 on the bottom surface of the second groove 2411 can be reduced.

[0392] In some embodiments, see Figure 6 and Figure 11 As shown, the limiting portion 243 is configured to divide the second groove 2411 into a first groove 2411a and a second groove 2411b. The first groove 2411a is located inside the limiting portion 243, and the second groove 2411b is located outside the limiting portion 243, and the second groove 2411b is disposed around the first groove 2411a. At least a portion of the first connecting portion 231 is accommodated in the first groove 2411a, and at least a portion of the electrode tab 222 is accommodated in the second groove 2411b.

[0393] The first groove 2411a is a groove structure formed by the bottom surface of the second groove 2411 and the inner peripheral surface of the limiting part 243. Similarly, the first groove 2411a is also the part located inside the limiting part 243 in the internal space of the second groove 2411. Correspondingly, the second groove 2411b is a groove structure formed by the bottom surface of the second groove 2411, the side surface of the second groove 2411, and the outer peripheral surface of the limiting part 243. Similarly, the second groove 2411b is also the part located outside the limiting part 243 in the internal space of the second groove 2411. Thus, the second groove 2411b is an annular groove structure surrounding the outside of the first groove 2411a.

[0394] It should be noted that the second groove 2411 of the first insulating member 24 is a structure provided on the third surface 241 of the first insulating member 24. If the limiting part 243 protrudes from the third surface 241 in the thickness direction X of the wall portion or the end face of the limiting part 243 away from the bottom surface of the groove of the second groove 2411 is flush with the third surface 241, then the groove depth of the first groove 2411a and the groove depth of the second groove 2411b are the same as the groove depth of the second groove 2411. If the limiting part 243 does not extend beyond the third surface 241 in the thickness direction X of the wall portion and is provided at intervals from the third surface 241, then the groove depth of the first groove 2411a and the groove depth of the second groove 2411b are both less than the groove depth of the second groove 2411.

[0395] At least a portion of the first connecting portion 231 is accommodated in the first groove 2411a, that is, at least a portion of the first connecting portion 231 is inserted into the second groove 2411 along the thickness direction X of the wall and is located on the inner peripheral side of the limiting portion 243.

[0396] At least a portion of the tab 222 is accommodated in the second groove 2411b, that is, at least a portion of the tab 222 is inserted into the second groove 2411 along the thickness direction X of the wall and is located on the outer periphery of the limiting portion 243.

[0397] In this embodiment, the limiting part 243 divides the second groove 2411 into a first groove 2411a located inside the limiting part 243 and a second groove 2411b located outside the limiting part 243, so that the second groove 2411b is a structure surrounding the outside of the first groove 2411a, and at least a portion of the first connecting part 231 and at least a portion of the tab 222 are respectively accommodated in the first groove 2411a and the second groove 2411b, so that the first groove 241a in the second groove 2411 is used to accommodate the first connecting part 231. 1a and the second groove 2411b for accommodating the tab 222 are independent structures. The battery cell 20 with this structure can reduce the interference between the first connecting part 231 and the tab 222. On the other hand, it can facilitate the assembly of at least a part of the first connecting part 231 and at least a part of the tab 222 into the second groove 2411. This helps to reduce the assembly difficulty between the electrode lead 23 and the first insulating part 24 and the electrode assembly 22 and the first insulating part 24, thereby improving the assembly efficiency of the battery cell 20.

[0398] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 6As shown, the tab 222 may include a connecting region 2221 and a bending region 2222. The connecting region 2221 is located on the side of the first connecting portion 231 opposite to the wall portion 211 in the thickness direction X of the wall portion and is connected to the first connecting portion 231. The bending region 2222 connects the connecting region 2221 and the main body portion 221. At least a portion of the bending region 2222 is accommodated within the second groove 2411 along the thickness direction X of the wall portion.

[0399] The connecting area 2221 is the region of the tab 222 located on the side of the first connecting portion 231 away from the wall portion 211 in the thickness direction X of the wall portion and connected to the first connecting portion 231. The bending area 2222 is the bending structure of the tab 222 connecting the connecting area 2221 and the main body portion 221 of the electrode assembly 22.

[0400] For example, the connecting area 2221 and the first connecting portion 231 are stacked and welded together along the thickness direction X of the wall. Of course, in other embodiments, the connection structure between the connecting area 2221 and the first connecting portion 231 can also be abutment or snap-fit, etc.

[0401] At least a portion of the bending area 2222 is accommodated in the second groove 2411 along the thickness direction X of the wall portion. That is, the area of ​​the tab 222 bent to form the bending area 2222 is inserted into the second groove 2411 along the thickness direction X of the wall portion. It should be noted that in the embodiment where the first insulating member 24 is provided with a limiting part 243 and the limiting part 243 divides the second groove 2411 into a first groove 2411a and a second groove 2411b, at least a portion of the bending area 2222 of the tab 222 is inserted into the second groove 2411 along the thickness direction X of the wall portion and is located in the second groove 2411b.

[0402] In this embodiment, the tab 222 has a connection area 2221 located on the side of the first connecting portion 231 away from the wall portion 211 in the thickness direction X of the wall portion and connected to the first connecting portion 231. The tab 222 also has a bending area 2222 connecting the connection area 2221 and the main body portion 221 to realize the electrical connection between the electrode assembly 22 and the electrode lead 23. By setting at least a portion of the bending area 2222 of the tab 222 to be accommodated in the second groove 2411 along the thickness direction X of the wall portion, the connection between the tab 222 and the first insulating member 24 in the thickness direction of the wall portion is realized. While sharing a portion of the space, X also allows for sufficient space between the first insulating member 24 and the main body 221 to accommodate the bending area 2222. This facilitates bending the tab 222 to connect the connection area 2221 of the tab 222 with the first connecting part 231, reducing the difficulty of bending the tab 222 and the assembly difficulty between the tab 222 and the first connecting part 231. On the other hand, it alleviates the phenomenon of the first insulating member 24 pressing down on the bending area 2222 of the tab 222, thus reducing the risk of damage to the bending area 2222 of the tab 222.

[0403] In some embodiments, see Figure 6 As shown, the bending area 2222 is bent to form multiple bending segments 2222a, which are connected in sequence. The bending segments 2222a at both ends of the multiple bending segments 2222a are connected to the connecting area 2221 and the main body 221, respectively.

[0404] The bending area 2222 is bent into multiple bending segments 2222a, which are connected in sequence. In other words, the bending area 2222 is a structure of bending in a local area, so that the bending area 2222 forms multiple bending segments 2222a connected in sequence, and each pair of adjacent bending segments 2222a is set at an acute angle, a right angle or an obtuse angle.

[0405] For example, in Figure 6 In the bending region 2222, four bending segments 2222a are formed by bending in sequence. The two bending segments 2222a at both ends of the four bending segments 2222a are connected to the connecting region 2221 and the main body 221, respectively. Of course, in other embodiments, the number of bending segments 2222a formed by bending in the bending region 2222 can also be two, three, five or six, etc.

[0406] In this embodiment, the bending area 2222 of the tab 222 is configured to be bent to form a plurality of sequentially connected bending segments 2222a, and the bending segments 2222a at both ends of the plurality of bending segments 2222a are respectively connected to the connecting area 2221 and the main body 221 to realize the bending structure of the tab 222. The battery cell 20 with this structure can reduce the difficulty of forming the bending area 2222 of the tab 222, so as to realize that the tab 222 has a connecting area 2221 on the side of the first connecting part 231 away from the wall part 211 in the thickness direction X of the wall part. On the other hand, the bending area 2222 can play a certain buffering role between the connecting area 2221 and the main body 221, which helps to reduce the phenomenon of rigid tension between the connecting area 2221 and the main body 221.

[0407] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 6 As shown, the wall portion 211 is provided with two electrode lead-out holes 2111, which are arranged at intervals along the first direction Y. The battery cell 20 also includes two electrode leads 23, each electrode lead 23 corresponding to one electrode lead-out hole 2111. The electrode assembly 22 includes two tabs 222 with opposite polarities. Both tabs 222 are connected to one end of the main body portion 221 facing the wall portion 211 in the thickness direction X of the wall portion, and the two tabs 222 are arranged at intervals along the first direction Y. Each tab 222 is connected to the first connecting portion 231 of an electrode lead 23. The bending area 2222 and the first connecting portion 231 are arranged along the second direction Z. The thickness direction X of the wall portion, the first direction Y, and the second direction Z are perpendicular to each other.

[0408] The electrode assembly 22 is provided with two tabs 222 of opposite polarity, namely a positive tab and a negative tab. Correspondingly, each tab 222 is connected to the first connection part 231 of an electrode lead 23 to realize the input or output of electrical energy of the battery cell 20.

[0409] For example, in this embodiment of the application, the battery cell 20 is cuboid. Correspondingly, the orthographic projection of the wall portion 211 in its thickness direction is rectangular. The length direction of the wall portion 211 is the first direction Y, and the width direction of the wall portion 211 is the second direction Z. Correspondingly, the two electrode leads 23 and the two tabs 222 are both structures that are spaced apart along the length direction of the wall portion 211. The bending area 2222 of the tab 222 and the first connecting portion 231 of the corresponding electrode lead 23 are arranged along the width direction of the wall portion 211. That is, the bending area 2222 of the tab 222 is located on one side of the first connecting portion 231 of the corresponding electrode lead 23 in the second direction Z.

[0410] In this embodiment, the wall portion 211 is provided with two electrode lead-out holes 2111 spaced apart along the first direction Y. The battery cell 20 is also provided with two electrode lead-out members 23 spaced apart along the first direction Y. Each electrode lead-out member 23 is correspondingly disposed in one electrode lead-out hole 2111, and the electrode assembly 22 is correspondingly provided with two tabs 222 spaced apart along the first direction Y. The two tabs 222 are respectively connected to the two electrode lead-out members 23 to realize the input or output of electrical energy of the battery cell 20. In this embodiment, by bending the tab 2222 and the electrode lead-out member 23, the battery cell 20 can achieve the input or output of electrical energy. The first connecting portion 231 of the battery cell 3 is configured to be arranged along the second direction Z, such that the arrangement direction of the bending area 2222 and the first connecting portion 231 is perpendicular to the arrangement direction of the two tabs 222. This facilitates bending the tabs 222 to form the bending section 2222a and reduces the assembly difficulty between the tabs 222 and the first connecting portion 231. On the other hand, it optimizes the internal space arrangement of the battery cell 20, which is beneficial to improving the internal space utilization of the battery cell 20 and reducing the interference between the bending areas 2222 of the two tabs 222.

[0411] According to some embodiments of this application, in conjunction with Figure 6 , Figure 8 , Figure 9 and Figure 10 As shown, along the thickness direction X of the wall portion, the first protrusion 2421 abuts against the first reinforcing portion 2113.

[0412] For example, among the plurality of first reinforcing portions 2113 of the reinforcing portion 211b, the first reinforcing portion 2113 with electrode lead-out holes 2111 abuts against the first protrusion 2421 along the thickness direction X of the wall portion, and among the plurality of third reinforcing portions 2117 of the reinforcing portion 211b, the two third reinforcing portions 2117 located on both sides in the first direction Y are respectively located on both sides of the first protrusion 2421 in the first direction Y, and the fourth reinforcing portion 2118 is also a structure located on both sides of the first protrusion 2421 in the first direction Y. Correspondingly, the second reinforcing portion 2115 is a structure that surrounds the outside of the first protrusion 2421.

[0413] In this embodiment, by setting the first protrusion 2421 protruding on the fourth surface 242 of the first insulating member 24 to abut against the first reinforcing part 2113 protruding on the first surface 2112 along the thickness direction X of the wall portion, the assembly compactness between the wall portion 211 and the first insulating member 24 can be improved, which helps to alleviate the phenomenon of wasted internal space of the battery cell 20. On the other hand, the assembly stability between the wall portion 211 and the first insulating member 24 can be improved, so as to reduce the phenomenon of shaking or displacement of the first insulating member 24 inside the outer casing 21.

[0414] According to some embodiments of this application, see Figure 5 , Figure 10 and Figure 11 As shown, the third surface 241 is provided with a second protrusion 2412, which abuts against the main body 221 along the thickness direction X of the wall portion.

[0415] The third surface 241 is provided with a second protrusion 2412, that is, the second protrusion 2412 protrudes from the surface of the first insulating member 24 where the second groove 2411 is provided.

[0416] Along the thickness direction X of the wall portion, the second protrusion 2412 abuts against the main body portion 221, that is, the second protrusion 2412 and the main body portion 221 of the electrode assembly 22 are arranged along the thickness direction X of the wall portion and abut against each other.

[0417] Optionally, the second protrusion 2412 protruding from the third surface 241 can be one or more. For example, in Figure 11 In the third surface 241, four second protrusions 2412 are provided, and at least some of the four second protrusions 2412 are spaced apart along the first direction Y. Of course, in other embodiments, the second protrusions 2412 on the third surface 241 can be two, three, five, six, seven or eight, etc.

[0418] In this embodiment, by providing a second protrusion 2412 on the third surface 241 of the first insulating member 24 where the second groove 2411 is provided, and the second protrusion 2412 having abuts against the main body 221 of the electrode assembly 22 in the thickness direction X of the wall portion, the first insulating member 24 and the main body 221 of the electrode assembly 22 can also play a role in mutual positioning and stabilization, thereby improving the stability of the first insulating member 24 between the main body 221 and the wall portion 211, and improving the stability of the electrode assembly 22 within the housing 21, which helps to reduce the risk of shaking or displacement of the first insulating member 24 and the electrode assembly 22 during use.

[0419] According to some embodiments of this application, refer to Figure 6 , Figure 7 , Figure 9 , Figure 10 and Figure 11 Please refer to further details. Figure 12 , Figure 12This is an exploded view of the structure of the electrode lead-out member 23 of the battery cell 20 provided in some embodiments of this application. The electrode lead-out member 23 may further include a lead-out portion 232 and a second connecting portion 233. Along the thickness direction X of the wall portion, the lead-out portion 232 is located on the side of the wall portion 211 opposite to the electrode assembly 22. The second connecting portion 233 passes through the electrode lead-out hole 2111 and connects the lead-out portion 232 and the first connecting portion 231. The bottom surface of the second groove 2411 is provided with a mounting hole 244. Along the thickness direction X of the wall portion, the mounting hole 244 is correspondingly provided with the electrode lead-out hole 2111, and the second connecting portion 233 passes through the mounting hole 244.

[0420] Along the thickness direction X of the wall portion, the lead-out portion 232 is located on the side of the wall portion 211 opposite to the electrode assembly 22. That is, the lead-out portion 232 and the first connecting portion 231 of the electrode lead-out member 23 are located on opposite sides of the wall portion 211, respectively. This results in the electrode lead-out member 23 having a first connecting portion 231 located inside the outer casing 21 and connected to the tab 222 of the electrode assembly 22, and the electrode lead-out member 23 having a lead-out portion 232 located outside the outer casing 21 and electrically connected to other components, thereby enabling the input or output of electrical energy from the battery cell 20. Correspondingly, the second connecting portion 233 is a component in which the electrode lead-out member 23 is inserted into the electrode lead-out hole 2111 along the thickness direction X of the wall portion and connects the lead-out portion 232 and the first connecting portion 231.

[0421] The bottom surface of the second groove 2411 is provided with a mounting hole 244, that is, the mounting hole 244 provided on the first insulating member 24 is a structure that penetrates the bottom surface of the second groove 2411 along the thickness direction X of the wall, and the mounting hole 244 penetrates the surface of the first protrusion 2421 away from the electrode assembly 22 along the thickness direction X of the wall.

[0422] Along the thickness direction X of the wall portion, the mounting hole 244 and the electrode lead-out hole 2111 are correspondingly provided. That is, in the projection plane perpendicular to the thickness direction X of the wall portion, the area defined by the orthographic projection of the hole wall surface of the mounting hole 244 and the area defined by the orthographic projection of the hole wall surface of the electrode lead-out hole 2111 overlap by at least a portion, thereby facilitating the second connecting portion 233 of the electrode lead-out member 23 to pass through the electrode lead-out hole 2111 and the mounting hole 244 sequentially along the thickness direction X of the wall portion.

[0423] It should be noted that in an embodiment where a limiting portion 243 is provided on the bottom surface of the second groove 2411 of the first insulating member 24, and the limiting portion 243 is configured to divide the second groove 2411 into a first groove 2411a located inside the limiting portion 243 and a second groove 2411b located outside the limiting portion 243, the mounting hole 244 communicates with the first groove 2411a. Correspondingly, the projection of the hole wall surface of the mounting hole 244 in the thickness direction X of the wall is located in the first groove 2411a.

[0424] In this embodiment, by providing an electrode lead-out hole 2111 on the wall portion 211 and providing a mounting hole 244 corresponding to the electrode lead-out hole 2111 on the bottom surface of the second groove 2411 of the first insulating member 24, the second connecting portion 233 of the electrode lead-out member 23 can pass through the electrode lead-out hole 2111 and the mounting hole 244 sequentially along the thickness direction X of the wall portion and connect the lead-out portion 232 and the first connecting portion 231. This enables the electrode lead-out member 23 to be electrically connected to the electrode assembly 22 and to input or output electrical energy of the battery cell 20 through the electrode lead-out member 23. The structure is simple and can reduce the assembly difficulty of the first insulating member 24 and the assembly difficulty between the electrode lead-out member 23 and the tab 222, which is beneficial to improving the assembly efficiency of the battery cell 20.

[0425] According to some embodiments of this application, see Figure 4 , Figure 5 , Figure 6 and Figure 12 As shown, the electrode lead-out member 23 may include a first connecting portion 231, a lead-out portion 232, and a second connecting portion 233. The first connecting portion 231 is located on the side of the wall portion 211 facing the electrode assembly 22 and is electrically connected to the electrode assembly 22. The lead-out portion 232 is located on the side of the wall portion 211 away from the electrode assembly 22. The second connecting portion 233 passes through the electrode lead-out hole 2111 along the thickness direction X of the wall portion, and the second connecting portion 233 connects the lead-out portion 232 and the first connecting portion 231.

[0426] The second connecting part 233 is a component of the electrode lead-out member 23 that passes through the electrode lead-out hole 2111 and the mounting hole 244 along the thickness direction X of the wall portion, and the second connecting part 233 serves to connect the lead-out part 232 and the first connecting part 231 located on both sides of the wall portion 211.

[0427] In this embodiment, the electrode lead-out member 23 is provided with a first connecting part 231 located on the side of the wall portion 211 facing the electrode assembly 22, a lead-out part 232 located on the side of the wall portion 211 away from the electrode assembly 22, and a second connecting part 233 passing through the electrode lead-out hole 2111. The first connecting part 231 is electrically connected to the electrode assembly 22, and the second connecting part 233 connects the lead-out part 232 and the first connecting part 231 to realize the input or output of electrical energy of the battery cell 20. The structure is simple and easy to assemble.

[0428] According to some embodiments of this application, see Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the battery cell 20 may also include a second insulating member 25, at least a portion of which is disposed between the wall portion 211 and the lead-out portion 232.

[0429] The second insulating member 25 serves as both the insulating isolation wall 211 and the lead-out portion 232 of the electrode lead-out member 23. The material of the second insulating member 25 can be various, such as silicone, rubber, or plastic.

[0430] At least a portion of the second insulating member 25 is disposed between the wall portion 211 and the lead-out portion 232. That is, the second insulating member 25 can be a structure in which the entire portion is located between the wall portion 211 and the lead-out portion 232, or it can be a structure in which only a portion is located between the wall portion 211 and the lead-out portion 232. For example, in Figure 5 and Figure 6 In this configuration, only a portion of the second insulating member 25 is located between the wall portion 211 and the lead-out portion 232, and a portion of the second insulating member 25 surrounds the outer periphery of the lead-out portion 232.

[0431] In this embodiment, the battery cell 20 is further provided with a second insulating member 25, and at least a portion of the second insulating member 25 is disposed between the wall portion 211 and the lead portion 232, so that the second insulating member 25 can achieve insulation isolation between the wall portion 211 and the lead portion 232 of the electrode lead 23, thereby reducing the risk of short circuit between the wall portion 211 and the lead portion 232 during use, which is beneficial to improving the reliability of the battery cell 20.

[0432] According to some embodiments of this application, see Figure 4 , Figure 5 , Figure 6 and Figure 9 As shown, along the thickness direction X of the wall portion, the first surface 2112 faces the electrode assembly 22, and the body portion 211a also has a second surface 2119 facing away from the electrode assembly 22. The second surface 2119 is provided with a mounting groove 2119a, and the two ends of the electrode lead-out hole 2111 respectively penetrate the bottom surface of the mounting groove 2119a and the reinforcing portion 211b. Along the thickness direction X of the wall portion, at least a portion of the second insulating member 25 is accommodated within the mounting groove 2119a.

[0433] Along the thickness direction X of the wall portion, the reinforcing portion 211b protrudes from the side of the body portion 211a facing the electrode assembly 22, that is, the reinforcing portion 211b is a structure located inside the outer shell 21.

[0434] The second surface 2119 is the outer surface of the body portion 211a facing away from the electrode assembly 22 in the thickness direction X of the wall portion. Correspondingly, the mounting groove 2119a is provided on the surface of the body portion 211a facing away from the electrode assembly 22, such that in the embodiment where the second reinforcing part 2115 of the reinforcing part 211b and the body portion 211a jointly define the first groove 2116, the first groove 2116 and the mounting groove 2119a are respectively provided on both sides of the wall portion 211 in the thickness direction X of the wall portion, and the first groove 2116 communicates with the internal space of the outer shell 21.

[0435] For example, in Figure 9 In the assembly groove 2119a and the first groove 2116 are respectively arranged along the thickness direction X of the wall. That is, in the projection plane perpendicular to the thickness direction X of the wall, at least part of the orthographic projection of the bottom surface of the assembly groove 2119a and the orthographic projection of the bottom surface of the first groove 2116 overlap.

[0436] The two ends of the electrode lead-out hole 2111 penetrate the bottom surface of the assembly groove 2119a and the reinforcing part 211b, respectively. That is, the two ends of the electrode lead-out hole 2111 in the thickness direction X of the wall penetrate the bottom surface of the assembly groove 2119a and the surface of the reinforcing part 211b facing the electrode assembly 22, so that the electrode lead-out hole 2111 connects the assembly groove 2119a and the first groove 2116.

[0437] Along the thickness direction X of the wall portion, at least a portion of the second insulating member 25 is accommodated within the assembly groove 2119a. That is, the second insulating member 25 can be a structure entirely accommodated within the assembly groove 2119a, or a structure only partially accommodated within the assembly groove 2119a. For example, in... Figure 6 In this process, only a portion of the second insulating element 25 is accommodated within the assembly groove 2119a.

[0438] It should be noted that in embodiments where an assembly groove 2119a is provided on the second surface 2119 of the main body 211a, and the assembly groove 2119a corresponds to the main body region 2113a of the first reinforcing part 2113, the wall thickness of the wall portion 211 in the first region can be greater than, less than, or equal to the wall thickness of the wall portion 211 in the second region. For example, if the groove depth of the assembly groove 2119a in the thickness direction X of the wall portion is greater than the main body region 2113a of the first reinforcing part 2113 protruding from the first surface 211... If the thickness of 2 is greater than the thickness of the wall portion 211 in the first region, then the wall thickness of the wall portion 211 in the second region is greater than the wall thickness of the wall portion 2111 in the second region; if the depth of the mounting groove 2119a in the thickness direction X of the wall portion is less than the thickness of the main body area 2113a of the first reinforcing part 2113 protruding from the first surface 2112, then the wall thickness of the wall portion 211 in the first region is less than the wall thickness of the wall portion 2111 in the second region; if the depth of the mounting groove 2119a in the thickness direction X of the wall portion is equal to the thickness of the main body area 2113a of the first reinforcing part 2113 protruding from the first surface 2112, then the wall thickness of the wall portion 211 in the first region is equal to the wall thickness of the wall portion 211 in the second region.

[0439] In this embodiment, an assembly groove 2119a is provided on the second surface 2119 of the body portion 211a, and the assembly groove 2119a is correspondingly provided with the electrode lead-out hole 2111. By setting at least a portion of the second insulating member 25 to be accommodated in the assembly groove 2119a along the thickness direction X of the wall portion, on the one hand, the assembly groove 2119a can play a certain limiting and positioning role for the second insulating member 25, which helps to reduce the difficulty of assembling the second insulating member 25 between the wall portion 211 and the lead-out portion 232, and can reduce the phenomenon of shaking or displacement of the second insulating member 25 during use, which helps to improve the assembly stability of the second insulating member 25. On the other hand, it can realize that the second insulating member 25 and the body portion 211a of the wall portion 211 share a part of the space in the thickness direction X of the wall portion, which helps to optimize the volume of the battery cell 20.

[0440] In some embodiments, see Figure 7 , Figure 8 and Figure 9 As shown, the reinforcing part 211b includes a first reinforcing part 2113, and an electrode lead-out hole 2111 is correspondingly disposed on the first reinforcing part 2113. In the projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the groove wall surface of the mounting groove 2119a is located within the outer contour of the orthographic projection of the first reinforcing part 2113.

[0441] In the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the groove wall surface of the assembly groove 2119a is located within the outer contour of the orthographic projection of the first reinforcing part 2113. It should be noted that the groove wall surface of the assembly groove 2119a includes the bottom surface and the side surface of the assembly groove 2119a. That is, the groove wall surface of the assembly groove 2119a is the surface of the assembly groove 2119a enclosed by the wall portion 211. In other words, the area defined by the outer contour of the projection of the first reinforcing part 2113 in the thickness direction X of the wall portion is a structure that covers the entire assembly groove 2119a.

[0442] For example, in an embodiment where the first reinforcing part 2113 includes a main body area 2113a and a connecting rib 2113b, the orthographic projection of the groove wall surface of the mounting groove 2119a is located within the outer contour of the orthographic projection of the main body area 2113a of the first reinforcing part 2113 in the projection plane perpendicular to the thickness direction X of the wall.

[0443] In this embodiment, the reinforcing part 211b includes a first reinforcing part 2113, and the electrode lead-out hole 2111 is correspondingly disposed at the first reinforcing part 2113 of the reinforcing part 211b, such that the electrode lead-out hole 2111 has a structure that penetrates the first reinforcing part 2113. By setting the orthographic projection of the groove wall surface of the mounting groove 2119a in the thickness direction X of the wall portion to a structure that lies within the outer contour of the orthographic projection of the first reinforcing part 2113 in the thickness direction X of the wall portion, the mounting groove 2119a is made to correspond to the first reinforcing part 2113 in the thickness direction X of the wall portion. The structure is designed such that the first reinforcing part 2113 of the reinforcing part 211b can strengthen the structural strength of the area where the electrode lead-out hole 2111 is provided in the wall part 211, and at the same time strengthen the structural strength of the area where the assembly groove 2119a is provided in the body part 211a. This improves the structural strength of the area where the assembly groove 2119a is provided in the body part 211a, thereby effectively mitigating the risk of deformation, collapse or cracking of the groove wall surface of the wall part 211 corresponding to the assembly groove 2119a during use, and improving the reliability of the battery cell 20.

[0444] According to some embodiments of this application, see Figure 9 As shown, in the projection plane perpendicular to the thickness direction X of the wall, the minimum distance between the outer contour of the orthographic projection of the groove wall of the assembly groove 2119a and the outer contour of the orthographic projection of the first reinforcing part 2113 is L2, which satisfies L2≥1mm.

[0445] In an embodiment where the first reinforcing part 2113 includes a main body area 2113a and a connecting rib 2113b, and the electrode lead-out hole 2111 passes through the main body area 2113a of the first reinforcing part 2113, and in a projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the groove wall surface of the assembly groove 2119a is located within the orthographic projection of the main body area 2113a of the first reinforcing part 2113, then in a projection plane perpendicular to the thickness direction X of the wall, the minimum distance between the outer contour of the orthographic projection of the groove wall surface of the assembly groove 2119a and the outer contour of the orthographic projection of the main body area 2113a of the first reinforcing part 2113 is L2.

[0446] For example, L2 can be 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.3mm, or 3.5mm, etc.

[0447] In this embodiment, by setting the minimum distance between the outer contour of the orthographic projection of the groove wall surface of the assembly groove 2119a in a projection plane perpendicular to the thickness direction X of the wall portion and the outer contour of the orthographic projection of the first reinforcing part 2113 in a projection plane perpendicular to the thickness direction X of the wall portion to be greater than or equal to 1 mm, the coverage effect of the projection of the first reinforcing part 2113 in the thickness direction X of the wall portion on the assembly groove 2119a can be improved, thereby enhancing the structural strength of the area of ​​the body portion 211a where the assembly groove 2119a is provided by the first reinforcing part 2113. This further mitigates the risk of deformation, collapse or cracking of the area of ​​the wall surface of the wall portion 211 corresponding to the groove wall surface of the assembly groove 2119a during use, thereby further improving the reliability of the battery cell 20.

[0448] In some embodiments, L2 ≥ 2 mm.

[0449] In this embodiment, by further setting the minimum distance between the outer contour of the orthographic projection of the groove wall surface of the assembly groove 2119a in a projection plane perpendicular to the thickness direction X of the wall portion and the outer contour of the orthographic projection of the first reinforcing part 2113 in a projection plane perpendicular to the thickness direction X of the wall portion to be greater than or equal to 1 mm, the coverage effect of the projection of the first reinforcing part 2113 in the thickness direction X of the wall portion on the assembly groove 2119a can be further improved, thereby further enhancing the structural strength of the area of ​​the body portion 211a where the assembly groove 2119a is provided by the first reinforcing part 2113. This can further mitigate the risk of deformation, collapse or cracking of the area of ​​the wall surface of the wall portion 211 corresponding to the groove wall surface of the assembly groove 2119a during use, thereby further improving the reliability of the battery cell 20.

[0450] According to some embodiments of this application, see Figure 7 , Figure 8 and Figure 9 As shown, along the thickness direction X of the wall portion, the first reinforcing portion 2113 has a fifth surface 2113c facing the electrode assembly 22, and both ends of the electrode lead-out hole 2111 penetrate the fifth surface 2113c and the bottom surface of the mounting groove 2119a, respectively. Along the thickness direction X of the wall portion, the minimum distance between the fifth surface 2113c and the bottom surface of the mounting groove 2119a is L3, satisfying 0.5mm ≤ L3 ≤ 3mm.

[0451] In this embodiment, the fifth surface 2113c is the surface of the first reinforcing part 2113 of the reinforcing part 211b facing the electrode assembly 22. If the first reinforcing part 2113 includes a main body region 2113a and a connecting rib 2113b, and the electrode lead-out hole 2111 passes through the main body region 2113a of the first reinforcing part 2113, and in the projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the groove wall surface of the mounting groove 2119a is located within the orthographic projection of the main body region 2113a of the first reinforcing part 2113, then the main body region 2113a has a fifth surface 2113c. Correspondingly, the surface of the main body region 2113a facing the electrode assembly 22 in the thickness direction X of the wall is the fifth surface 2113c.

[0452] For example, along the thickness direction X of the wall portion, the thickness of the main body region 2113a of the first reinforcing part 2113 protruding from the first surface 2112 is equal to the thickness of the connecting rib 2113b of the first reinforcing part 2113 protruding from the first surface 2112, such that in the thickness direction X of the wall portion, the thickness T1 of the main body region 2113a protruding from the first surface 2112 is also equal to the thickness T2 of the first reinforcing part 2113 protruding from the first surface 2112, that is, T1 and T2 are equal.

[0453] The two ends of the electrode lead-out hole 2111 penetrate the fifth surface 2113c and the bottom surface of the assembly groove 2119a, respectively. That is to say, the electrode lead-out hole 2111 penetrates the bottom wall of the assembly groove 2119a along the thickness direction X of the wall portion, and also penetrates the main body area 2113a of the first reinforcing part 2113 of the reinforcing part 211b.

[0454] For example, the minimum distance L3 between the bottom surface of the mounting groove 2119a and the fifth surface 2113c can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm, etc.

[0455] In this embodiment, by setting the minimum distance between the bottom surface of the assembly groove 2119a and the fifth surface 2113c of the first reinforcing part 2113 in the thickness direction X of the wall portion to 0.5mm to 3mm, on the one hand, the structural strength of the area of ​​the wall portion 211 where the assembly groove 2119a is provided can be further improved, which is conducive to further mitigating the deformation, collapse or cracking of the area of ​​the wall portion 211 used for assembling the electrode lead 23, thereby improving the reliability of the battery cell 20. On the other hand, the space occupied by the area between the bottom surface of the assembly groove 2119a and the fifth surface 2113c of the first reinforcing part 2113 used for setting the electrode lead hole 2111 in the thickness direction X of the wall portion can be saved, thereby optimizing the length dimension of the second connecting part 233 of the electrode lead 23 in the thickness direction X of the wall portion, so that the second connecting part 233 can be inserted into the electrode lead hole 2111, and the manufacturing cost of the second connecting part 233 can be reduced.

[0456] According to some embodiments of this application, see Figure 5 , Figure 6 and Figure 12 As shown, the second connecting part 233 is riveted to the lead-out part 232.

[0457] For example, the lead-out portion 232 is provided with a riveting hole 2321, which penetrates the surfaces of both sides of the lead-out portion 232 along the thickness direction X of the wall portion. Correspondingly, the second connecting portion 233 is inserted into the riveting hole 2321 and riveted to the lead-out portion 232.

[0458] It should be noted that in other embodiments, the lead-out portion 232 and the second connecting portion 233 may also be connected to each other by welding or snap-fitting structures.

[0459] In this embodiment, by setting the second connecting part 233 and the lead-out part 232 as a riveted structure, it is beneficial to improve the connection stability between the second connecting part 233 and the lead-out part 232, thereby reducing the risk of connection failure of the electrode lead-out part 23 during use, and also reducing the connection difficulty between the second connecting part 233 and the lead-out part 232, thereby improving the assembly efficiency of the battery cell 20.

[0460] According to some embodiments of this application, please refer to Figure 5 , Figure 6 and Figure 12 As shown, the first connecting portion 231 and the second connecting portion 233 are integrally formed. That is, the first connecting portion 231 and the second connecting portion 233 of the electrode lead-out member 23 are structures manufactured by an integral forming process, such as casting, stamping or milling.

[0461] In this embodiment, by setting the first connecting part 231 and the second connecting part 233 as an integrally formed structure, on the one hand, the connection stability between the first connecting part 231 and the second connecting part 233 can be improved, thereby reducing the risk of connection failure of the electrode lead 23 during use. On the other hand, the assembly and connection process of the first connecting part 231 and the second connecting part 233 can be reduced during the assembly process of the battery cell 20, which is conducive to optimizing the production cycle of the battery cell 20 and improving the assembly efficiency of the battery cell 20.

[0462] In some embodiments, please continue to see Figure 5 , Figure 6 and Figure 12 As shown, along the thickness direction X of the wall portion, the second connecting portion 233 protrudes from the surface of the first connecting portion 231 facing the wall portion 211. That is, the second connecting portion 233 and the first connecting portion 231 are arranged along the thickness direction X of the wall portion, and the end of the second connecting portion 233 near the first connecting portion 231 is connected to the surface of the first connecting portion 231 facing the wall portion 211.

[0463] For example, in the projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the second connecting portion 233 is located within the orthographic projection of the first connecting portion 231.

[0464] In this embodiment, by setting the second connecting part 233 as a structure that protrudes from the surface of the first connecting part 231 facing the wall part 211, on the one hand, the assembly difficulty of the second connecting part 233 passing through the electrode lead hole 2111 can be reduced, thereby reducing the assembly difficulty of the battery cell 20. On the other hand, the space occupied by the first connecting part 231 and the second connecting part 233 in the direction perpendicular to the thickness direction X of the wall part can be saved, which is beneficial to optimizing the internal space layout of the battery cell 20.

[0465] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures, such as the first connecting part 231 and the second connecting part 233 being separately arranged. That is, the first connecting part 231 and the second connecting part 233 of the electrode lead-out member 23 are two independent components, and the first connecting part 231 and the second connecting part 233 are connected to each other. Correspondingly, the first connecting part 231 can be an adapter piece or current collector, etc., disposed between the second connecting part 233 and the tab 222.

[0466] In this embodiment, by setting the first connecting part 231 and the second connecting part 233 as separate structures, it is beneficial to improve the assembly flexibility of the electrode lead 23, so that the positions of the first connecting part 231 and the second connecting part 233 can be adjusted according to the actual assembly situation to meet the assembly application scenarios of different battery cells 20.

[0467] In embodiments where the first connecting portion 231 and the second connecting portion 233 are separately configured, the first connecting portion 231 and the second connecting portion 233 are welded together. Of course, in other embodiments, the first connecting portion 231 and the second connecting portion 233 may also be abutting or snap-fitted together.

[0468] In this embodiment, by setting the first connecting part 231 and the second connecting part 233 to be welded together, the connection stability between the first connecting part 231 and the second connecting part 233 can be improved, thereby reducing the risk of connection failure of the electrode lead 23 during use.

[0469] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 6 As shown, the battery cell 20 may also include a seal 26. The seal 26 is disposed between the electrode lead 23 and the wall portion 211, and the seal 26 is configured to seal the gap between the electrode lead 23 and the wall surface of the electrode lead hole 2111.

[0470] The sealing element 26 serves to seal the gap between the second connecting part 233 of the electrode lead-out part 23 and the hole wall of the electrode lead-out hole 2111. The sealing element 26 can be made of various materials, such as rubber, plastic or silicone.

[0471] For example, in Figure 6 In this process, the sealing member 26 is sleeved on the outside of the second connecting portion 233 of the electrode lead-out member 23, and a portion of the sealing member 26 is located inside the electrode lead-out hole 2111, such that a portion of the sealing member 26 is located between the second connecting portion 233 and the hole wall surface of the electrode lead-out hole 2111, so as to seal the gap between the electrode lead-out member 23 and the hole wall surface of the electrode lead-out hole 2111.

[0472] In this embodiment, the battery cell 20 is also provided with a sealing member 26. By placing the sealing member 26 between the wall portion 211 and the second connecting portion 233 of the electrode lead 23, the sealing member 26 can seal the gap between the electrode lead 23 and the hole wall surface of the electrode lead hole 2111, thereby reducing the risk of leakage of the battery cell 20 at the electrode lead hole 2111, which is beneficial to improving the stability and reliability of the battery cell 20.

[0473] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, the wall portion 211 may also be provided with an injection hole 2114, which penetrates the wall portion 211 along the thickness direction X and is located in the first region.

[0474] The electrolyte injection hole 2114 is connected to the receiving cavity 2121 of the housing 212 so as to enable the injection of electrolyte into the receiving cavity 2121 of the housing 212. In some embodiments, the battery cell 20 may also include an electrolyte injection plug (not shown in the figure), which is disposed on the wall 211 and blocks the electrolyte injection hole 2114.

[0475] For example, the injection plug can be made of metal, such as copper, iron, or aluminum alloy. Of course, the injection plug can also be made of non-metallic material, such as rubber, plastic, or silicone. Similarly, the connection structure between the injection plug and the wall 211 can be various, such as welding, snap-fit, or interference fit.

[0476] The injection hole 2114 penetrates the wall portion 211 along the thickness direction X of the wall portion. The injection hole 2114 is provided in the first region, that is, the injection hole 2114 is provided in the region where the reinforcing portion 211b protrudes from the body portion 211a. This results in the injection hole 2114 having a structure that penetrates both the body portion 211a and the reinforcing portion 211b in the thickness direction X of the wall portion. In other words, in the thickness direction X of the wall portion, a portion of the injection hole 2114 is located inside the body portion 211a, while another portion is located inside the reinforcing portion 211b. Correspondingly, the projection of the hole wall surface of the injection hole 2114 in the thickness direction X of the wall portion is located inside the outer contour of the reinforcing portion 211b, resulting in the reinforcing portion 211b having a structure that at least partially surrounds the electrode lead-out hole 2111.

[0477] It should be noted that in embodiments where both electrode lead-out holes 2111 and liquid injection holes 2114 are provided on the wall portion 211, and the reinforcing portion 211b includes multiple first reinforcing portions 2113, the electrode lead-out holes 2111 and liquid injection holes 2114 are respectively provided on different first reinforcing portions 2113. In embodiments where the liquid injection hole 2114 is provided on the first reinforcing portion 2113, and the first reinforcing portion 2113 includes a main body region 2113a and multiple connecting ribs 2113b, the liquid injection hole 2114 is provided on the main body region 2113a, that is, the liquid injection hole 2114 has a structure that penetrates the main body region 2113a of the first reinforcing portion 2113 along the thickness direction X of the wall portion.

[0478] In this embodiment, by providing an injection hole 2114 for injecting electrolyte into the outer casing 21 on the wall portion 211, and the injection hole 2114 being located in the first region of the wall portion 211, the injection hole 2114 has a structure in which one end of the wall portion 211 penetrates the first region of the wall portion 211 where the reinforcing portion 211b is provided. This strengthens the structural strength of the region of the wall portion 211 where the injection hole 2114 is provided, which helps to reduce the risk of deformation, collapse or cracking in the region of the outer casing 21 where the injection hole 2114 is provided during use, thereby improving the stability and reliability of the battery cell 20.

[0479] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the wall portion 211 is also provided with a pressure relief hole, which penetrates the wall portion 211 along the thickness direction X. The battery cell 20 also includes a pressure relief component, which is connected to the wall portion 211 and blocks the pressure relief hole. The pressure relief component is configured to release the internal pressure of the battery cell 20, and the pressure relief hole is located in the first region. That is to say, the pressure relief hole can also be provided on the wall portion 211. Correspondingly, the pressure relief component is installed on the wall portion 211. Correspondingly, the pressure relief hole is located in the region where the reinforcing portion 211b protrudes from the body portion 211a, so that the pressure relief hole has a structure that penetrates both the body portion 211a and the reinforcing portion 211b in the thickness direction X of the wall portion. That is, in the thickness direction X of the wall portion, a part of the hole is located in the body portion 211a, and another part is located in the reinforcing portion 211b.

[0480] In this embodiment, by providing a pressure relief hole for installing a pressure relief component and for pressure relief on the wall portion 211, and the pressure relief hole being located in the first region of the wall portion 211, the pressure relief hole has one end penetrating through the first region of the wall portion 211 where the reinforcing part 211b is provided. This strengthens the structural strength of the region of the wall portion 211 where the pressure relief hole is provided, which helps to reduce the risk of deformation, collapse, or cracking in the region of the outer casing 21 where the pressure relief component is provided during use. This improves the stability of the pressure relief component and enhances the reliability of the battery cell 20.

[0481] According to some embodiments of this application, the outer casing 21 is made of metal.

[0482] For example, the material of the outer casing 21 may be copper, iron, aluminum, steel or aluminum alloy, etc.

[0483] In this embodiment, by setting the outer shell 21 to a metal structure, it is easier to form the outer shell 21 and reduce the manufacturing difficulty of the outer shell 21. On the other hand, it can enhance the overall structural strength of the outer shell 21, so as to alleviate the phenomenon of fatigue cracking or deformation and collapse when the outer shell 21 is subjected to external impact or expansion of the battery cell 20 during use, thereby reducing the risk of the battery cell 20 bursting and being damaged during use, and improving the stability and reliability of the battery cell 20.

[0484] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 of any of the above schemes.

[0485] Among them, see Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0486] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0487] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0488] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0489] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in... Figure 2 In the battery device 100, multiple battery cells 20 are arranged inside the housing 10. The multiple battery cells 20 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 20 is housed in the housing 10. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 10.

[0490] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0491] It should be noted that in some embodiments, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0492] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 of any of the above schemes or a battery device 100 of any of the above schemes.

[0493] The electrical device can be any of the aforementioned devices or systems that use a single battery cell 20 or a battery device 100.

[0494] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0495] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The outer casing has a wall portion, wherein the wall portion is provided with an electrode lead-out hole, the electrode lead-out hole penetrating the wall portion along the thickness direction; Electrode assembly, housed within the housing; as well as An electrode lead-out member is disposed in the electrode lead-out hole, and the electrode lead-out member is electrically connected to the electrode assembly; The wall portion includes an integrally formed body portion and a reinforcing portion. Along the thickness direction of the wall portion, the reinforcing portion protrudes from a first surface on one side of the body portion. The area on the first surface where the reinforcing portion protrudes is the first area of ​​the wall portion, and the electrode lead-out hole is located in the first area.

2. The battery cell according to claim 1, characterized in that, The reinforcing part includes a first reinforcing part, the first reinforcing part having a main body area, and the electrode lead-out hole is disposed in the main body area; The main body area is arranged around the electrode lead-out hole.

3. The battery cell according to claim 2, characterized in that, In a projection plane perpendicular to the thickness direction of the wall portion, the geometric center of the orthographic projection of the main body area coincides with the geometric center of the orthographic projection of the wall surface of the electrode lead-out hole.

4. The battery cell according to claim 2, characterized in that, Along the thickness direction of the wall portion, the thickness of the main body region protruding from the first surface is T1, which satisfies 0.2mm≤T1≤2mm.

5. The battery cell according to claim 1, characterized in that, The wall portion is provided with two electrode lead-out holes, and the battery cell includes two electrode leads with opposite polarities. Each electrode lead is correspondingly disposed in one electrode lead-out hole, and both electrode leads are electrically connected to the electrode assembly. The reinforcing portion includes a plurality of first reinforcing portions arranged at intervals along a first direction, and each electrode lead-out hole is disposed in one of the first reinforcing portions, wherein the first direction is perpendicular to the thickness direction of the wall portion.

6. The battery cell according to claim 5, characterized in that, The wall portion is also provided with a liquid injection hole, which penetrates the wall portion along the thickness direction. The liquid injection hole is located in the first region, and the liquid injection hole and the two electrode lead-out holes are respectively located in different first reinforcing portions. Wherein, along the first direction, the first reinforcing part with the injection hole is located between the two first reinforcing parts with the electrode lead-out hole.

7. The battery cell according to claim 1, characterized in that, The outer casing includes: The housing has an internal cavity, and an opening is formed at one end of the housing in the thickness direction of the wall, the opening communicating with the cavity, and at least a portion of the electrode assembly is accommodated within the cavity; An end cap, which covers the opening and is connected to the housing; The wall portion is the end cap.

8. The battery cell according to claim 7, characterized in that, Along the thickness direction of the wall portion, at least a portion of the body portion is inserted into the receiving cavity through the opening, the outer peripheral surface of the body portion abuts against the inner peripheral surface of the housing, and the body portion is welded to the housing.

9. The battery cell according to claim 8, characterized in that, The reinforcing portion includes a second reinforcing portion extending circumferentially along the body portion, and the outer peripheral surface of the second reinforcing portion is flush with the outer peripheral surface of the body portion. The outer peripheral surface of the second reinforcing part abuts against the inner peripheral surface of the housing, and the second reinforcing part is welded to the housing.

10. The battery cell according to claim 9, characterized in that, The second reinforcing part is a ring structure extending circumferentially along the main body.

11. The battery cell according to claim 9, characterized in that, The minimum distance between the outer peripheral surface and the inner peripheral surface of the second reinforcing part is L1, which satisfies 1mm≤L1≤5mm.

12. The battery cell according to claim 11, characterized in that, 1.5mm≤L1≤4mm.

13. The battery cell according to claim 8, characterized in that, The wall portion also includes: An edge portion protrudes from the outer peripheral surface of the main body portion, and the edge portion abuts against the end of the housing where the opening is provided along the thickness direction of the wall portion.

14. The battery cell according to claim 13, characterized in that, The edge portion is a ring structure extending circumferentially along the body portion.

15. The battery cell according to any one of claims 1-14, characterized in that, The reinforcing portion includes a first reinforcing portion and a second reinforcing portion. The electrode lead-out hole is disposed in the first reinforcing portion. The second reinforcing portion is disposed around the first reinforcing portion. The inner circumferential surface of the second reinforcing portion and the first surface together define a first groove. The first reinforcing portion is located in the first groove.

16. The battery cell according to claim 15, characterized in that, The first reinforcing part is connected to the side of the first groove.

17. The battery cell according to claim 16, characterized in that, The first reinforcing part is multiple, and the multiple first reinforcing parts are arranged at intervals along the first direction in the first groove, and each electrode lead-out hole is correspondingly disposed on one of the first reinforcing parts; The groove side of the first groove includes a first side and a second side disposed opposite to each other in the second direction. Both the first side and the second side are connected to the first reinforcing part. The thickness direction of the wall part, the first direction and the second direction are perpendicular to each other.

18. The battery cell according to claim 17, characterized in that, The first reinforcing part includes a main body area and a plurality of connecting ribs, the electrode lead-out hole is disposed in the main body area, and the plurality of connecting ribs are arranged at intervals along the circumference of the main body area; Both the first side and the second side are connected to the main body area by at least one of the connecting ribs.

19. The battery cell according to claim 18, characterized in that, The width of the connecting rib is W1, which satisfies the condition 0.5mm≤W1≤3mm.

20. The battery cell according to claim 17, characterized in that, The reinforcing portion further includes a plurality of third reinforcing portions arranged at intervals along the first direction, the third reinforcing portions being located within the first groove, and the second reinforcing portions extending along the second direction; Along the first direction, the first reinforcing part and the third reinforcing part are alternately arranged, and every two adjacent third reinforcing parts are connected through the first reinforcing part.

21. The battery cell according to claim 20, characterized in that, The first reinforcing part includes a main body area and a plurality of connecting ribs, the electrode lead-out hole is disposed in the main body area, and the plurality of connecting ribs are arranged at intervals along the circumference of the main body area; Along the first direction, each pair of adjacent third reinforcing parts is connected to the main body area by at least one connecting rib.

22. The battery cell according to claim 20, characterized in that, Along the second direction, the two ends of the third reinforcing part are respectively connected to the first side and the second side.

23. The battery cell according to claim 20, characterized in that, Along the first direction, the width of the third reinforcing part is W2, which satisfies 0.5mm≤W2≤3mm.

24. The battery cell according to claim 20, characterized in that, The groove side of the first groove also includes a third side and a fourth side disposed opposite to each other in the first direction, and a plurality of the third reinforcing parts are located between the third side and the fourth side in the first direction; The reinforcing portion further includes a plurality of fourth reinforcing portions, which are located within the first groove and extend along the first direction. Along the first direction, the third reinforcing portion closest to the third side surface among the plurality of third reinforcing portions is connected to the third side surface through at least one fourth reinforcing portion, and the third reinforcing portion closest to the fourth side surface among the plurality of third reinforcing portions is connected to the fourth side surface through at least one fourth reinforcing portion.

25. The battery cell according to claim 24, characterized in that, Along the second direction, the width of the fourth reinforcing part is W3, which satisfies 0.5mm≤W3≤3mm.

26. The battery cell according to claim 17, characterized in that, In a projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the wall portion is rectangular, and the size of the orthographic projection of the wall portion in the first direction is greater than the size of the orthographic projection of the wall portion in the second direction.

27. The battery cell according to claim 15, characterized in that, Along the thickness direction of the wall portion, the thickness of the first reinforcing part protruding from the first surface is T2, and the thickness of the second reinforcing part protruding from the first surface is T3, satisfying that T2 < T3.

28. The battery cell according to claim 27, characterized in that, T2≥0.15T3.

29. The battery cell according to claim 27, characterized in that, 0.2mm≤T2≤2mm.

30. The battery cell according to claim 27, characterized in that, 0.2mm≤T3≤3mm.

31. The battery cell according to claim 15, characterized in that, Along the thickness direction of the wall portion, the body portion on the side opposite to the reinforcing portion also has a second surface, the distance between the second surface and the first surface is D, and the thickness of the second reinforcing portion protruding from the first surface is T3, satisfying 0.05≤T3 / (T3+D)≤0.

875.

32. The battery cell according to claim 31, characterized in that, 1mm≤D≤4mm.

33. The battery cell according to claim 15, characterized in that, Along the thickness direction of the wall portion, the first surface faces the electrode assembly.

34. The battery cell according to claim 33, characterized in that, The electrode lead-out includes a first connecting portion, and the electrode assembly includes a main body and an electrode tab. The electrode tab is connected to one end of the main body facing the wall in the thickness direction of the wall, and the electrode tab is electrically connected to the first connecting portion. The battery cell further includes a first insulating member, which is disposed inside the housing, and at least a portion of the first insulating member is located between the wall portion and the first connecting portion; Along the thickness direction of the wall portion, the first insulating member has a third surface facing away from the wall portion and a fourth surface facing the wall portion. The third surface is provided with a second groove, and the fourth surface is formed with a first protrusion at a position corresponding to the second groove. At least a portion of the first protrusion is accommodated in the first groove, and at least a portion of the first connecting portion and at least a portion of the electrode tab are both accommodated in the second groove.

35. The battery cell according to claim 34, characterized in that, The bottom surface of the second groove is provided with a limiting part, which surrounds the outer periphery of the first connecting part.

36. The battery cell according to claim 35, characterized in that, The limiting part is a ring structure that extends circumferentially along the first connecting part.

37. The battery cell according to claim 36, characterized in that, The limiting portion is configured to divide the second groove into a first groove and a second groove, the first groove being located inside the limiting portion and the second groove being located outside the limiting portion, and the second groove being arranged around the first groove; Wherein, at least a portion of the first connecting portion is accommodated in the first groove, and at least a portion of the electrode tab is accommodated in the second groove.

38. The battery cell according to claim 34, characterized in that, The electrode includes: A connecting region is located on the side of the first connecting portion away from the wall portion in the thickness direction of the wall portion and is connected to the first connecting portion; A bending area connects the connecting area and the main body. Wherein, at least a portion of the bending area is accommodated within the second groove along the thickness direction of the wall portion.

39. The battery cell according to claim 38, characterized in that, The bending area is bent into multiple bending segments, which are connected sequentially, and the bending segments at both ends are respectively connected to the connecting area and the main body.

40. The battery cell according to claim 38, characterized in that, The wall portion is provided with two electrode lead-out holes, which are arranged at intervals along a first direction. The battery cell also includes two electrode lead-out members, each of which is correspondingly disposed in one electrode lead-out hole. The electrode assembly includes two tabs with opposite polarities. Both tabs are connected to one end of the main body facing the wall in the thickness direction of the wall. The two tabs are arranged at intervals along the first direction. Each tab is connected to the first connecting portion of an electrode lead-out. The bending area and the first connecting portion are arranged along the second direction, and the thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other.

41. The battery cell according to claim 34, characterized in that, Along the thickness direction of the wall portion, the first protrusion abuts against the first reinforcing portion.

42. The battery cell according to claim 34, characterized in that, The third surface is provided with a second protrusion, which abuts against the main body along the thickness direction of the wall portion.

43. The battery cell according to claim 34, characterized in that, The electrode lead-out component further includes a lead-out portion and a second connecting portion. Along the thickness direction of the wall portion, the lead-out portion is located on the side of the wall portion away from the electrode assembly, and the second connecting portion passes through the electrode lead-out hole, connecting the lead-out portion and the first connecting portion. The second groove has a mounting hole on its bottom surface. Along the thickness direction of the wall, the mounting hole corresponds to the electrode lead-out hole, and the second connecting part passes through the mounting hole.

44. The battery cell according to claim 1, characterized in that, The electrode lead-out component includes: A first connecting portion is located on the side of the wall facing the electrode assembly and is electrically connected to the electrode assembly; The lead-out portion is located on the side of the wall portion opposite to the electrode assembly; The second connecting part is inserted into the electrode lead-out hole along the thickness direction of the wall portion, and the second connecting part connects the lead-out portion and the first connecting part.

45. The battery cell according to claim 44, characterized in that, The battery cell further includes a second insulating member, at least a portion of which is disposed between the wall portion and the lead-out portion.

46. ​​The battery cell according to claim 45, characterized in that, Along the thickness direction of the wall portion, the first surface faces the electrode assembly, and the body portion also has a second surface facing away from the electrode assembly. The second surface is provided with an assembly groove, and the two ends of the electrode lead-out hole respectively penetrate the bottom surface of the assembly groove and the reinforcing portion. Wherein, at least a portion of the second insulating member is accommodated within the assembly groove along the thickness direction of the wall portion.

47. The battery cell according to claim 46, characterized in that, The reinforcing part includes a first reinforcing part, and the electrode lead-out hole is correspondingly disposed on the first reinforcing part; Specifically, in the projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the groove wall of the assembly groove is located within the outer contour of the orthographic projection of the first reinforcing part.

48. The battery cell according to claim 47, characterized in that, In the projection plane perpendicular to the thickness direction of the wall, the minimum distance between the outer contour of the orthographic projection of the groove wall of the assembly groove and the outer contour of the orthographic projection of the first reinforcing part is L2, which satisfies L2≥1mm.

49. The battery cell according to claim 48, characterized in that, L2≥2mm.

50. The battery cell according to claim 49, characterized in that, Along the thickness direction of the wall portion, the first reinforcing portion has a fifth surface facing the electrode assembly, and the two ends of the electrode lead-out hole respectively penetrate the fifth surface and the bottom surface of the mounting groove; Wherein, along the thickness direction of the wall portion, the minimum distance between the fifth surface and the bottom surface of the assembly groove is L3, which satisfies 0.5mm≤L3≤3mm.

51. The battery cell according to claim 44, characterized in that, The second connecting part is riveted to the lead-out part.

52. The battery cell according to claim 44, characterized in that, The first connecting part and the second connecting part are integrally formed.

53. The battery cell according to claim 52, characterized in that, Along the thickness direction of the wall portion, the second connecting portion protrudes from the surface of the first connecting portion facing the wall portion.

54. The battery cell according to claim 44, characterized in that, The first connecting part and the second connecting part are separately provided.

55. The battery cell according to claim 54, characterized in that, The first connecting part and the second connecting part are welded together.

56. The battery cell according to claim 1, characterized in that, The battery cell also includes: A sealing element is disposed between the electrode lead and the wall portion, the sealing element being configured to seal the gap between the electrode lead and the wall surface of the electrode lead hole.

57. The battery cell according to claim 1, characterized in that, The wall portion is also provided with a liquid injection hole, which penetrates the wall portion along the thickness direction of the wall portion; The injection hole is located in the first region.

58. The battery cell according to claim 1, characterized in that, The wall portion is also provided with a pressure relief hole, which penetrates the wall portion along the thickness direction. The battery cell also includes a pressure relief component, which is connected to the wall portion and blocks the pressure relief hole. The pressure relief component is configured to release the internal pressure of the battery cell. The pressure relief hole is located in the first region.

59. The battery cell according to claim 1, characterized in that, The outer shell is made of metal.

60. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-59.

61. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-59 or a battery device as described in claim 60.

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