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. Wherein the battery monomer comprises a shell and an electrode assembly. The electrode assembly is housed within the housing. The wall portion of the shell is provided with a first surface, the first surface is provided with a first groove, a reinforcing piece is arranged on the groove bottom face of the first groove in a protruding mode, the reinforcing piece is connected with the groove side face of the first groove, and the wall portion and the reinforcing piece are integrally formed. According to the battery monomer, the overall weight of the shell is reduced, and meanwhile, the structural strength of the wall part of the shell is not excessively influenced; therefore, while the mass energy density of the battery monomer is improved, the phenomena that the wall part of the shell is subjected to external impact in the use process or the battery monomer is subjected to fatigue cracking or deformation damage during expansion can be relieved, so that the risk of burst damage of the battery monomer is reduced; and thus, the use stability and reliability of the battery monomer are improved while the use performance of the battery monomer is improved.

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 housing and an electrode assembly housed within the housing. The housing has a casing and end caps, which together define an assembly cavity for housing the electrode assembly. However, the existing battery cell housings have low structural strength, making them prone to fatigue cracking or deformation damage 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 and an electrode assembly; the housing has a wall portion; the electrode assembly is housed within the housing; wherein, along the thickness direction of the wall portion, one side of the wall portion has a first surface, the first surface is provided with a first groove, a reinforcing member is protruding from the bottom surface of the first groove, the reinforcing member is connected to the side surface of the first groove, and the wall portion and the reinforcing member are integrally formed.

[0006] In the above technical solution, a first groove is provided on the first surface of the wall to reduce the weight of the wall. A reinforcing member is provided on the bottom surface of the first groove, and the reinforcing member is connected to the side surface of the first groove. The reinforcing member and the wall are integrally formed. The battery cell with this structure can reduce the overall weight of the battery cell casing without excessively affecting the structural strength of the casing wall. This can effectively alleviate the phenomenon of fatigue cracking or deformation damage of the casing wall when subjected to external impact or expansion of the battery cell during use, while improving the mass energy density of the battery cell. This reduces the risk of the battery cell bursting during use, thereby improving the performance of the battery cell and also improving the stability and reliability of the battery cell.

[0007] In some embodiments, the reinforcement is configured to divide the first groove into a plurality of sub-grooves.

[0008] In the above technical solution, by setting the reinforcing member to be connected to the side of the first groove and dividing the first groove into multiple sub-grooves, the reinforcing member is a structure that is connected to at least two positions of the side of the first groove at intervals in the circumferential direction of the side of the first groove. This can further enhance the reinforcing effect of the reinforcing member on the structural strength of the wall, thereby improving the mass energy density of the battery cell and further mitigating the phenomenon of fatigue cracking or deformation damage of the wall of the casing when subjected to external impact or expansion of the battery cell during use, so as to reduce the risk of the battery cell bursting during use.

[0009] In some embodiments, the reinforcing member includes a plurality of first reinforcing portions spaced apart along a first direction, the first reinforcing portions protruding from the bottom surface of the first groove, the groove side surface of the first groove including a first side surface and a second side surface disposed opposite to each other in a second direction, the thickness direction of the wall portion being perpendicular to the first direction and the second direction; wherein, the first reinforcing portion extends along the second direction, and the two ends of the first reinforcing portion in the second direction are respectively connected to the first side surface and the second side surface.

[0010] In the above technical solution, the reinforcing member is provided with a plurality of first reinforcing parts arranged at intervals along the first direction. The first reinforcing parts extend along the second direction, and the two ends of the first reinforcing parts in the second direction are respectively connected to the first side and the second side of the first groove. This can improve the reinforcing effect of the reinforcing member on the structural strength of the wall, so as to 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. This can effectively reduce the risk of battery cell bursting during use, thereby improving the stability and reliability of the battery cell.

[0011] In some embodiments, along the first direction, the width of the first reinforcing portion is W1, satisfying 0.5mm≤W1≤3mm.

[0012] In the above technical solution, the width of the first reinforcing part in the first direction is 0.5mm to 3mm. On the one hand, setting the width of the first 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 first reinforcing part on the 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 first reinforcing part in the first direction to be less than or equal to 3mm saves the space occupied by the first reinforcing part in the first direction, which is beneficial to reduce the weight of the shell and can reduce the molding difficulty of the first reinforcing part.

[0013] In some embodiments, the reinforcing member further includes a second reinforcing portion, which protrudes from the bottom surface of the first groove; wherein, along the first direction, a second reinforcing portion is provided between every two adjacent first reinforcing portions, and the second reinforcing portion connects two adjacent first reinforcing portions.

[0014] In the above technical solution, the reinforcing member is also provided with a second reinforcing part. By providing a second reinforcing part between each two adjacent first reinforcing parts and connecting the second reinforcing part with the two adjacent first reinforcing parts, it is possible to connect the multiple first reinforcing parts of the reinforcing member into a whole. This is beneficial to further enhance the reinforcing effect of the reinforcing member on 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. This can further reduce the risk of battery cell bursting damage during use, and further improve the stability and reliability of the battery cell.

[0015] In some embodiments, the second reinforcing portion connects the first side and the second side.

[0016] In the above technical solution, by connecting the second reinforcing part to the first side and the second side of the first groove, the strengthening effect of the second reinforcing part on the structural strength of the wall can be improved, and the stability and reliability of the second reinforcing part protruding from the bottom surface of the first groove can be improved.

[0017] In some embodiments, the second reinforcing portion includes a main body region and a plurality of connecting ribs, the plurality of connecting ribs being arranged at circumferential intervals along the main body region; wherein, both the first side and the second side are connected to the main body region by at least one of the connecting ribs, and two adjacent first reinforcing portions are connected to the main body region by at least one of the connecting ribs.

[0018] In the above technical solution, the second reinforcing part is provided with a main body area and a plurality of connecting ribs arranged around the main body area. The first side and the second side are both connected to the main body area through at least one connecting rib, and two adjacent first reinforcing parts are both connected to the main body area through at least one connecting rib, so as to realize that the second reinforcing part connects two adjacent first reinforcing parts, the first side and the second side. The second reinforcing part with this structure can further improve the overall structural strength of the reinforcing member, which is conducive to further improving the reinforcing effect of the reinforcing member on the structural strength of the wall.

[0019] In some embodiments, the main body region of at least one of the second reinforcing portions is provided with an electrode lead-out hole, and the battery cell further includes an electrode lead-out member. Along the thickness direction of the wall portion, at least a portion of the electrode lead-out member passes through the electrode lead-out hole, and the electrode lead-out member is electrically connected to the electrode assembly.

[0020] In the above technical solution, by setting the electrode lead-out hole of the wall portion for mounting the electrode lead-out component to a structure located on the main body area of ​​the second reinforcing part, the area of ​​the wall portion for mounting the electrode lead-out component is the structure corresponding to the main body area of ​​the second reinforcing part. This can improve the structural strength of the area of ​​the wall portion for mounting the electrode lead-out component, which is beneficial to improving the structural stability of the electrode lead-out component assembled on the wall portion. It can also reduce the risk of deformation or cracking in the area of ​​the wall portion where the electrode lead-out hole is located during use, thereby improving the stability and reliability of the battery cell.

[0021] In some embodiments, at least one of the main body regions of the second reinforcing portion is provided with a liquid injection hole.

[0022] In the above technical solution, by setting the liquid injection hole of the wall portion for liquid injection as a structure located on the main body area of ​​the second reinforcing part, the area of ​​the wall portion for liquid injection hole is the structure of the main body area of ​​the second reinforcing part, thereby improving the structural strength of the area of ​​the wall portion for liquid injection hole, which helps to reduce the risk of deformation or cracking in the area of ​​the wall portion for liquid injection hole during use, thereby improving the stability and reliability of the battery cell.

[0023] In some embodiments, there are multiple second reinforcing portions, and each of the main body regions of two second reinforcing portions is provided with an electrode lead-out hole. The battery cell also includes two electrode leads with opposite polarities. Along the thickness direction of the wall portion, at least a portion of each electrode lead-out hole passes through one of the electrode lead-out holes, and both electrode leads are electrically connected to the electrode assembly. In this embodiment, along the first direction, the second reinforcing portion provided with the liquid injection hole is located between the two second reinforcing portions provided with the electrode lead-out hole.

[0024] In the above technical solution, two electrode lead-out holes are provided on the wall portion, and in the first direction, the second reinforcing portion with the liquid injection hole is located between the two second reinforcing portions with the electrode lead-out holes. On the one hand, this can optimize the layout of the area on the wall portion with the liquid injection hole and the two electrode lead-out holes, which is beneficial to improving the regularity of the battery cell. On the other hand, it can realize that the area on the wall portion with the liquid injection hole and the two electrode lead-out holes is separated by the first reinforcing portion, thereby reducing the stress influence between the area on the wall portion with the liquid injection hole and the two electrode lead-out holes, which is beneficial to improving the stability of the battery cell in use.

[0025] In some embodiments, the width of the connecting rib is W2, satisfying 0.5mm≤W2≤3mm.

[0026] 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 structural strength of the wall by the connecting rib, 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 connecting rib to be less than or equal to 3mm saves the space occupied by the connecting rib, which is beneficial to reduce the weight of the shell and can reduce the molding difficulty of the connecting rib.

[0027] 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 first reinforcing portions are located between the third side and the fourth side in the first direction; wherein, the reinforcing member further includes a plurality of third reinforcing portions, the third reinforcing portions protruding from the groove bottom surface of the first groove, and the third reinforcing portions extending along the first direction, and along the first direction, the first reinforcing portion closest to the third side among the plurality of first reinforcing portions is connected to the third side through at least one of the third reinforcing portions, and the first reinforcing portion closest to the fourth side among the plurality of first reinforcing portions is connected to the fourth side through at least one of the third reinforcing portions.

[0028] In the above technical solution, the reinforcing member is further provided with multiple third reinforcing parts. By setting the first reinforcing part closest to the third side among the multiple first reinforcing parts spaced apart along the first direction to be connected to the third side through at least one third reinforcing part, and setting the first reinforcing part closest to the fourth side among the multiple first reinforcing parts spaced apart along the first direction to be connected to the fourth side through at least one third reinforcing part, it is possible to achieve that the two first reinforcing parts located on both sides in the first direction are connected to the groove side of the first groove to form a whole. This is beneficial to further improve the reinforcing effect of the reinforcing member on 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, thereby further reducing the risk of battery cell bursting damage during use, and further improving the stability and reliability of the battery cell.

[0029] In some embodiments, along the second direction, the width of the third reinforcing portion is W3, satisfying 0.5mm≤W3≤3mm.

[0030] In the above technical solution, the width of the third reinforcing part in the second direction is 0.5mm to 3mm. On the one hand, setting the width of the third reinforcing part in the second 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 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 second direction to be less than or equal to 3mm saves the space occupied by the third reinforcing part in the second direction, which is beneficial to reduce the weight of the shell and can reduce the molding difficulty of the third reinforcing part.

[0031] 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.

[0032] 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 the multiple first reinforcing portions, and the width direction of the wall portion is the extension direction of the first reinforcing portions, the battery cell with this structure can reduce the difficulty of setting multiple first reinforcing portions arranged at intervals along the first direction on the bottom surface of the first groove, and can improve the reinforcing effect of the multiple first reinforcing portions on the structural strength of the wall portion.

[0033] In some embodiments, along the thickness direction of the wall portion, the side of the wall portion opposite to the first surface also has a second surface, the distance between the second surface and the first surface is D, and the groove depth of the first groove is H, satisfying 0.05≤H / D≤0.875.

[0034] In the above technical solution, by setting the ratio of the groove depth of the first groove to the distance between the first surface and the second surface to 0.05 to 0.875, the groove depth of the first groove is 0.05 to 0.875 of the wall thickness of the area where the first groove is set in the wall. On the one hand, this can improve the weight reduction effect of the first groove on the wall, which is conducive to reducing the overall weight of the casing and increasing the weight energy density of the battery cell. On the other hand, it can alleviate the phenomenon of weak structural strength in the area where the first groove is set in the wall, which is conducive to improving the structural strength of the area where the first groove is set in the wall, thereby reducing the risk of deformation or cracking of the wall during use.

[0035] In some embodiments, 1mm ≤ D ≤ 4mm.

[0036] 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 area of ​​the wall portion used to set the first groove is 1mm to 4mm. On the one hand, it can improve the structural strength of the wall portion, reduce the risk of deformation or cracking during use, and reduce the difficulty of opening the first groove on the first surface of the wall portion. On the other hand, it can save the space occupied by the wall portion and reduce the weight of the wall portion.

[0037] In some embodiments, the reinforcement does not extend beyond the first surface along the thickness direction of the wall portion.

[0038] In the above technical solution, by setting the reinforcing member to be a structure that does not extend beyond the first surface in the thickness direction of the wall, the reinforcing member is integrally housed in the first groove, thereby reducing the interference between the reinforcing member and other components inside the battery cell, and the first groove can provide a certain degree of protection for the reinforcing member to reduce the wear and tear on the reinforcing member during use.

[0039] In some embodiments, along the thickness direction of the wall portion, the groove depth of the first groove is H, and the thickness of the reinforcing member protruding from the bottom surface of the first groove is T, satisfying that T≥0.15H.

[0040] In the above technical solution, by setting the thickness of the reinforcing member protruding from the bottom surface of the first groove in the wall thickness direction to be greater than or equal to 0.15 times the groove depth of the first groove, it is beneficial to improve the structural strength of the reinforcing member itself, thereby further improving the reinforcing effect of the reinforcing member on the structural strength of the wall.

[0041] In some embodiments, the housing includes a shell and an end cap. The shell has an internal cavity, and the shell has an opening at one end in the thickness direction of the wall portion, the opening communicating with the cavity. At least a portion of the electrode assembly is accommodated in the cavity, and at least a portion of the end cap is inserted into the cavity through the opening. The end cap has a first outer peripheral surface that abuts against the inner peripheral surface of the shell, and the end cap is welded to the shell. The wall portion is the end cap, and the minimum distance between the groove side of the first groove and the first outer peripheral surface is L1, satisfying 1mm ≤ L1 ≤ 5mm.

[0042] In the above technical solution, the wall portion is an end cap in the outer shell used to close the opening and weld it to the shell. By setting the minimum distance between the side of the first groove and the first outer peripheral surface of the end cap to 1mm to 5mm, on the one hand, the thickness of the part of the end cap located between the side of the first groove and the first outer peripheral surface can be increased, so as to reduce the influence of the first groove on the welding position of the end cap and the shell, thereby effectively improving the welding penetration between the end cap and the shell, which is beneficial to improving the welding stability and welding quality between the end cap and the shell. On the other hand, it can alleviate the phenomenon that the area where the first groove is set on the end cap is limited due to the excessive minimum distance between the side of the first groove and the first outer peripheral surface of the end cap, thereby reducing the difficulty of setting the first groove on the first surface of the end cap and alleviating the phenomenon of poor weight reduction effect of the end cap.

[0043] In some embodiments, 1.5mm ≤ L1 ≤ 4mm.

[0044] In the above technical solution, by further setting the minimum distance between the side of the first groove and the first outer peripheral surface of the end cap to 1.5mm to 4mm, on the one hand, the thickness of the part of the end cap located between the side of the first groove and the first outer peripheral surface can be further increased, so as to further reduce the influence of the first groove on the welding position of the end cap and the shell, thereby further improving the welding penetration between the end cap and the shell, which is conducive to further improving the welding stability and welding quality between the end cap and the shell. On the other hand, it can further alleviate the phenomenon of the limited area of ​​the end cap where the first groove is set, thereby further reducing the difficulty of setting the first groove on the first surface of the end cap, and further alleviating the phenomenon of poor weight reduction effect of the end cap.

[0045] In some embodiments, the end cap includes a body portion and an edge portion; along the thickness direction of the wall portion, a portion of the body portion is inserted into the receiving cavity through the opening, the body portion having a first outer peripheral surface and the body portion having a first surface; the edge portion protrudes from the first outer peripheral surface, and the edge portion abuts against the end of the housing having the opening along the thickness direction of the wall portion.

[0046] In the above technical solution, the end cap is provided with a body part and an edge part. The body part has a first outer peripheral surface that abuts against the inner peripheral surface of the housing and a first surface for providing a first groove. By setting the edge part of the end cap to be protruding from the first outer peripheral surface and abutting against the end of the housing with an opening along the thickness direction of the wall part, the body part of the end cap can close the opening and provide the first groove, while the edge part can also play a certain limiting and positioning role on the body part. This helps to reduce the assembly difficulty between the end cap and the housing and improve the assembly quality between the end cap and the housing.

[0047] In some embodiments, the edge portion is an annular structure surrounding the body portion.

[0048] 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.

[0049] In some embodiments, the Vickers hardness of the area of ​​the wall portion on the first surface where the first groove is not provided is HV1, and the Vickers hardness of the area of ​​the wall portion on the first surface where the first groove is provided is HV2, satisfying that 1≤HV2-HV1≤10.

[0050] In the above technical solution, by setting the Vickers hardness of the area where the first groove is formed on the first surface of the wall to be 1 to 10 greater than the Vickers hardness of the area where the first groove is not formed on the first surface of the wall, the structure of the area where the first groove is formed on the wall can be formed by stamping. The battery cell with this structure can reduce the forming difficulty of the wall, thereby reducing the manufacturing difficulty of the battery cell. On the other hand, it can effectively improve the structural strength of the area where the wall is thinned, thereby reducing the risk of deformation or cracking in the area where the first groove is set on the wall during use.

[0051] In some embodiments, the first surface is disposed facing the electrode assembly along the thickness direction of the wall portion.

[0052] In the above technical solution, the first surface is the surface of the wall facing the electrode assembly, so that the first groove is formed on the side of the wall facing the electrode assembly. The battery cell with this structure can reduce the accumulation of external impurities in the first groove and realize the structure of the reinforcing member located inside the shell, which is beneficial to reduce the wear of the reinforcing member during use. On the other hand, it can realize the connection between the first groove and 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.

[0053] In some embodiments, the electrode assembly includes a main body and a tab, the tab being connected to one end of the main body facing the wall in the thickness direction of the wall; the battery cell further includes an electrode lead and a first insulating member, the electrode lead being disposed in the wall and including a first connecting portion connected to the tab, the first insulating member being disposed within the housing, and at least a portion of the first insulating member being 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 having a second groove, the fourth surface having a first protrusion formed at a position corresponding to the second groove, at least a portion of the first protrusion being accommodated in the first groove, and at least a portion of the first connecting portion and at least a portion of the tab being accommodated in the second groove.

[0054] In the above technical solution, a second groove is provided on the third surface of the first insulating member away from the wall, and a first protrusion is provided on the fourth surface of the first insulating member facing the wall 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, as well as the effect of the first insulating member to be insulating and isolating the first connecting portion and the wall, while also realizing that the first insulating member and the wall share a portion of space in the thickness direction of the wall. In addition, while ensuring that there is sufficient space between the first insulating member and the main body 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 and the first insulating member and the electrode tab share a portion of space in the thickness direction of the wall. 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, 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.

[0055] 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.

[0056] 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.

[0057] In some embodiments, the limiting portion is an annular structure extending circumferentially along the first connecting portion.

[0058] 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.

[0059] 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; wherein at least a portion of the first connecting portion is accommodated in the first groove, at least a portion of the electrode tab is accommodated in the second groove, and the second groove is disposed around the first groove.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In some embodiments, the battery cell includes two electrode leads, which are spaced apart on the wall portion along a first direction; the electrode assembly includes two tabs of opposite polarity, each tab being connected to one end of the main body portion facing the wall portion in the thickness direction, and the two tabs are spaced apart along the first direction, with each tab connected to the first connecting portion of one of the electrode leads; wherein the bending region 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.

[0066] In the above technical solution, the battery cell is further provided with two electrode leads arranged at intervals along a first direction, 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 leads 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 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.

[0067] In some embodiments, the first protrusion abuts against the reinforcement along the thickness direction of the wall portion.

[0068] In the above technical solution, by setting the first protrusion on the fourth surface of the first insulating member as a structure that abuts against the reinforcing member on the bottom surface of the first groove 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.

[0069] 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.

[0070] 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.

[0071] In some embodiments, the wall portion is provided with an electrode lead-out hole, which penetrates the wall portion along its thickness direction. 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 opposite to 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 through hole, which is correspondingly provided with the electrode lead-out hole along the thickness direction of the wall portion, and the second connecting portion passes through the through hole.

[0072] In the above technical solution, by setting electrode lead-out holes on the wall and setting through 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 through 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.

[0073] In some embodiments, the wall portion is provided with an electrode lead-out hole, which penetrates the wall portion along its thickness direction; wherein, the battery cell further includes an electrode lead-out member, at least a portion of which passes through the electrode lead-out hole, and the electrode lead-out member is electrically connected to the electrode assembly.

[0074] In the above technical solution, by providing an electrode lead-out hole that penetrates the wall along the thickness direction of the wall, and at least a portion of the electrode lead-out member is inserted into the electrode lead-out hole, the electrode lead-out member can be electrically connected to the electrode assembly, and the input or output of electrical energy of the battery cell can be realized through the electrode lead-out member.

[0075] In some embodiments, the electrode lead-out member includes a lead-out portion, a first connecting portion, and a second connecting portion; the lead-out portion is located on the side of the wall portion away from the electrode assembly; at least a portion of 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 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.

[0076] In the above technical solution, the electrode lead-out member is provided with a lead-out portion located on the side of the wall away from the electrode assembly and a first connecting portion located at least partially on the side of the wall facing the electrode assembly. The first connecting portion is electrically connected to the electrode assembly. The electrode lead-out member is also provided with a second connecting portion passing through the electrode lead-out hole. The second connecting portion connects the lead-out portion and the first connecting portion to realize the input or output of electrical energy of the battery cell. The structure is simple and easy to assemble.

[0077] 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.

[0078] 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.

[0079] In some embodiments, along the thickness direction of the wall portion, the first surface faces the electrode assembly, and the wall portion further has a second surface facing away from the electrode assembly. The second surface is provided with a mounting groove, and the mounting groove and the first groove are correspondingly provided along the thickness direction of the wall portion. The electrode lead-out hole communicates with the mounting groove and the first groove. In this embodiment, along the thickness direction of the wall portion, at least a portion of the second insulating member is accommodated in the mounting groove.

[0080] In the above technical solution, by providing an assembly groove on the second surface of the wall, and at least a portion of the second insulating member being accommodated in the assembly groove along the thickness direction of the wall, the battery cell with this structure can, on the one hand, limit and position the second insulating member through the assembly groove, which helps to reduce the difficulty of assembling the second insulating member between the wall and the lead-out part, and 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 wall share part of the space in the thickness direction of the wall, which helps to optimize the volume of the battery cell.

[0081] In some embodiments, the reinforcing member includes a main body region protruding from the bottom surface of the first groove, the main body region having a fifth surface facing the electrode assembly in the thickness direction of the wall portion; wherein, along the thickness direction of the wall portion, the bottom surface of the first groove is positioned corresponding to the mounting groove to form the main body region, and both ends of the electrode lead-out hole penetrate the fifth surface and the bottom surface of the mounting groove, respectively.

[0082] In the above technical solution, by protruding the main body area of ​​the reinforcing member at the position corresponding to the assembly groove on the bottom surface of the first groove, the reinforcing member can not only strengthen the structural strength of the wall but also improve the structural strength of the part of the wall located between the bottom surface of the assembly groove and the bottom surface of the first groove. This helps to alleviate the deformation or cracking of the area of ​​the wall used for assembling electrode leads, thereby improving the reliability of the battery cell.

[0083] In some embodiments, along the thickness direction of the wall portion, the minimum distance between the fifth surface and the bottom surface of the mounting groove is L2, satisfying 0.5mm≤L2≤3mm.

[0084] In the above technical solution, by setting the minimum distance between the bottom surface of the assembly groove and the fifth surface of the main body area 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 improved, which helps to alleviate the deformation or cracking of the area of ​​the wall used for assembling electrode leads, thereby improving the reliability of the battery cell. On the other hand, it can save the space occupied by the area between the bottom surface of the assembly groove and the fifth surface of the main body area used for setting electrode lead holes in the thickness direction of the wall, thereby optimizing the length dimension of the second connecting part of the electrode lead in the thickness direction of the wall, so as to facilitate the second connecting part to be inserted into the electrode lead hole, and reduce the manufacturing cost of the second connecting part.

[0085] In some embodiments, the second connecting portion is riveted to the lead-out portion.

[0086] 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.

[0087] In some embodiments, the first connecting portion and the second connecting portion are integrally formed.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] In some embodiments, the first connecting portion and the second connecting portion are separately disposed.

[0092] 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.

[0093] In some embodiments, the first connecting portion and the second connecting portion are welded together.

[0094] 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.

[0095] In some embodiments, the battery cell further includes a seal; the seal is disposed between the second connection portion and the wall portion, and the seal is configured to seal the gap between the second connection portion and the wall surface of the electrode lead-out hole.

[0096] 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 second connecting part of the electrode lead and the hole wall of the electrode lead, thereby reducing the risk of leakage at the electrode lead of the battery cell and improving the stability and reliability of the battery cell.

[0097] In some embodiments, the outer casing is made of metal.

[0098] 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.

[0099] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0100] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0101] 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.

[0102] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0103] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0104] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0105] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0106] Figure 5 A schematic diagram of the end cap structure of a battery cell provided in some embodiments of this application;

[0107] Figure 6 A front view of the end cap of a battery cell provided in some embodiments of this application, facing the first surface in the thickness direction of the wall portion;

[0108] Figure 7 A cross-sectional view of the end cap of a battery cell provided in some embodiments of this application, perpendicular to a first direction;

[0109] Figure 8 A partial cross-sectional view of a battery cell perpendicular to a first direction, provided for some embodiments of this application;

[0110] Figure 9 for Figure 8 A magnified view of part A of the shown battery cell;

[0111] Figure 10 This is a schematic diagram of the structure of the first insulating element provided in some embodiments of this application;

[0112] Figure 11 Axonal view of a first insulating element provided for some embodiments of this application;

[0113] 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.

[0114] Icons: 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Battery cell; 20a - Outer casing; 21 - Housing; 211 - Receiving cavity; 212 - Opening; 22 - End cap; 22a - Wall; 221 - Body; 2211 - First surface; 2212 - First groove; 2212a - First side; 2212b - Second side; 2212c - Third side; 2212d - Fourth side; 2212e - Sub-groove; 2213 - Second surface; 2214 - Injection hole; 2215 - Electrode lead-out hole; 2216 - First outer peripheral surface; 2217 - Assembly groove; 222 - Edge; 23 - Electrode assembly; 231 - Main body; 232 - Tab; 2321 - Connection area; 2322 - Bending Area; 2322a-Bending section; 24-Reinforcing member; 241-First reinforcing part; 242-Second reinforcing part; 2421-Main body area; 2421a-Fifth surface; 2422-Connecting rib; 243-Third reinforcing part; 25-Electrode lead-out member; 251-First connecting part; 252-Lead-out part; 2521-Rivet hole; 253-Second connecting part; 26-First insulating member; 261-Third surface; 2611-Second groove; 2611a-First groove; 2611b-Second groove; 2612-Second protrusion; 2613-Through hole; 262-Fourth surface; 2621-First protrusion; 263-Limiting part; 27-Second insulating member; 28-Sealing member; 200-Controller; 300-Motor; X-Thickness direction of the wall; Y-First direction; Z-Second direction. Detailed Implementation

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] In this application, "multiple" means two or more (including two).

[0122] 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.).

[0128] 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 Mn1 / 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.

[0129] 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.

[0130] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0131] 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.).

[0132] 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.

[0133] 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.

[0134] 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.

[0135] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0136] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0144] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0145] 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.

[0146] 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.

[0147] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0148] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0149] In some implementations, the electrode assembly has a stacked structure.

[0150] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0151] 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.

[0152] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0153] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0154] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0155] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0156] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0157] 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.

[0158] 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.

[0159] The battery apparatus 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 connected in series, parallel, or mixed connections via a busbar.

[0160] 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 together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0161] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0162] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0163] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0164] 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.

[0165] 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.

[0166] 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.

[0167] 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.

[0168] 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.

[0169] For a typical battery cell, it usually includes a casing and an electrode assembly. The casing includes a housing and end caps. The housing is a hollow structure with an opening at one end. The electrode assembly is housed inside the housing, and the end caps close to the opening of the housing and are connected to the housing. In related technologies, in order to improve the gravimetric energy density of the battery cell, the end caps or housing of the casing are usually thinned to reduce the overall weight of the battery cell, thereby increasing the gravimetric energy density. However, this structure weakens the structural strength of the end caps or housing, making the casing more susceptible to fatigue cracking or deformation damage when subjected to external impacts or the expansion of the battery cell during use. It also results in insufficient connection strength between the end caps and housing, making the battery cell more prone to bursting damage during use, which is detrimental to improving the stability and reliability of the battery cell.

[0170] 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 and an electrode assembly. The casing has a wall. The electrode assembly is housed within the casing. Along the thickness direction of the wall, one side of the wall has a first surface, and the first surface is provided with a first groove. A reinforcing member is protruding from the bottom surface of the first groove, and the reinforcing member is connected to the side surface of the first groove. The wall and the reinforcing member are integrally formed.

[0171] In this type of battery cell, a first groove is provided on the first surface of the wall to reduce the weight of the wall. A reinforcing member is provided on the bottom surface of the first groove, and the reinforcing member is connected to the side surface of the first groove. The reinforcing member and the wall are integrally formed. This type of battery cell can reduce the overall weight of the battery cell casing without excessively affecting the structural strength of the casing wall. This can improve the mass energy density of the battery cell and effectively mitigate the phenomenon of fatigue cracking or deformation damage of the casing wall when subjected to external impact or expansion of the battery cell during use. This reduces the risk of the battery cell bursting during use, thereby improving the performance of the battery cell and also improving its stability and reliability.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] Please refer to Figure 1 , Figure 1This 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 and Figure 6 , 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 schematic diagram of the structure of the end cap 22 of the battery cell 20 provided in some embodiments of this application. Figure 6 This is a front view of the end cap 22 of a battery cell 20 provided in some embodiments of this application, facing the first surface 2211 in the thickness direction X of the wall portion. This application provides a battery cell 20, which includes a housing 20a and an electrode assembly 23. The housing 20a has a wall portion 22a. The electrode assembly 23 is housed within the housing 20a. Along the thickness direction X of the wall portion, one side of the wall portion 22a has a first surface 2211. The first surface 2211 is provided with a first groove 2212. A reinforcing member 24 protrudes from the bottom surface of the groove 2212. The reinforcing member 24 is connected to the side surface of the groove 2212, and the wall portion 22a and the reinforcing member 24 are integrally formed.

[0184] The outer shell 20a can also be used to contain electrolytes, such as electrolyte solution. The outer shell 20a can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 20a can be made of various materials, such as metallic or non-metallic materials. In this embodiment, the outer shell 20a is made of metallic materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0185] In some embodiments, the housing 20a can be a sealed structure or a non-sealed structure. As an example, when the housing 20a is a sealed structure, it can protect the electrode assembly 23 and prevent, to some extent, electrolyte leakage. When the housing 20a is a non-sealed structure, it can still protect the electrode assembly 23. A sealing bag may also be included between the housing 20a and the electrode assembly 23 to encapsulate the electrode assembly 23 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0186] Optionally, the housing 20a may include a housing 21 and an end cap 22. The housing 21 has an internal cavity 211 for accommodating the electrode assembly 23 and has an opening 212. That is, the housing 21 is a hollow structure with an opening 212 at one end. The end cap 22 covers the opening 212 of the housing 21 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte.

[0187] The housing 21 includes a bottom wall and a side wall. The bottom wall and the end cap 22 are disposed opposite each other along the thickness direction X of the wall portion. The side wall surrounds the bottom wall, and one end of the side wall in the thickness direction X of the wall portion is connected to the bottom wall, while the other end forms an opening 212.

[0188] It should be noted that the wall portion 22a with the first groove 2212 and the reinforcing member 24 can be the end cap 22 of the outer casing 20a, or it can be a wall of the housing 21 of the outer casing 20a. For example, in Figure 3 and Figure 4 In this embodiment, the wall portion 22a is the end cap 22. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 22a can also be the bottom wall of the housing 21 and the end cap 22 disposed opposite to each other, or the wall portion 22a can also be the side wall of the housing 21 and the end cap 22 that are adjacent to each other and connected to each other.

[0189] When assembling the battery cell 20, the electrode assembly 23 can be placed into the housing 21 first, and the electrolyte can be filled into the housing 21. Then, the end cap 22 can be closed onto the opening 212 of the housing 21 to complete the assembly of the battery cell 20.

[0190] The outer shell 20a can be of various shapes, such as a cylinder, cuboid, or prism. The shape of the outer shell 20a can be determined according to the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 is a cylindrical structure, then a cylindrical outer shell 20a can be selected; if the electrode assembly 23 is a cuboid structure, then a cuboid outer shell 20a can be selected.

[0191] For example, in Figure 3 and Figure 4 In the middle, the outer shell 20a is in the shape of a cuboid, the height direction of the outer shell 20a is the thickness direction X of the wall, correspondingly, the projection of the wall 22a on the thickness direction X of the wall is rectangular, the length direction of the outer shell 20a is the first direction Y, the first direction Y is also the length direction of the wall 22a, the thickness direction of the outer shell 20a is the second direction Z, the second direction Z is also the width direction of the wall 22a.

[0192] 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 casing 20a can include a casing 21 and two end caps 22. The casing 21 is a hollow structure with openings 212 formed on both opposite sides in the thickness direction X of the wall. One end cap 22 is fitted onto one opening 212 of the casing 21 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte. That is, the casing 21 has openings 212 on both opposite sides, and the two end caps 22 are fitted onto both sides of the casing 21 to close the corresponding openings 212.

[0193] The end cap 22 covers the opening 212 and is connected to the housing 21, that is, the end cap 22 and the housing 21 are connected to each other, and the end cap 22 serves to close the opening 212. Optionally, the connection structure between the end cap 22 and the housing 21 can be various, such as welding connection or snap-fit ​​connection.

[0194] Along the thickness direction X of the wall portion, one side of the wall portion 22a has a first surface 2211. Correspondingly, the first surface 2211 can be the inner surface of the wall portion 22a facing the electrode assembly 23 in the thickness direction X of the wall portion, or it can be the outer surface of the wall portion 22a facing away from the electrode assembly 23 in the thickness direction X of the wall portion.

[0195] For example, in this embodiment of the application, the first surface 2211 is the inner surface of the wall portion 22a on the side facing the electrode assembly 23 in its thickness direction.

[0196] Among them, reference Figure 6 Please refer to further details. Figure 7 , Figure 8 and Figure 9 , Figure 7This is a cross-sectional view of the end cap 22 of the battery cell 20 provided in some embodiments of this application, perpendicular to the first direction Y. Figure 8 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 9 for Figure 8 The diagram shows a partial enlarged view of point A of the battery cell 20. The end cap 22 may include a body portion 221 and an edge portion 222. Along the thickness direction X of the wall portion, a portion of the body portion 221 is inserted into the receiving cavity 211 through the opening 212, and the outer peripheral surface of the body portion 221 abuts against the inner peripheral surface of the housing 21. The inner surface of the body portion 221 facing the electrode assembly 23 is the first surface 2211. The edge portion 222 protrudes from the outer peripheral surface of the body portion 221 and abuts against the end of the housing 21 where the opening 212 is provided along the thickness direction X of the wall portion.

[0197] The bottom surface of the first groove 2212 is provided with a reinforcing member 24, that is, the reinforcing member 24 is a structure that is connected to the bottom surface of the first groove 2212 and protrudes from the bottom surface of the first groove 2212.

[0198] In this embodiment, the reinforcing member 24 and the wall portion 22a are integrally formed. Specifically, the wall portion 22a is integrally formed using processes such as stamping, casting, or milling to create the first groove 2212, and the reinforcing member 24 is formed on the bottom surface of the first groove 2212. For example, in this embodiment, the first groove 2212 and the reinforcing member 24 are formed on the wall portion 22a using a stamping process, allowing the first groove 2212 to be stamped on the first surface 2211 of the wall portion 22a while simultaneously forming the reinforcing member 24 on the bottom surface of the first groove 2212. Of course, in other embodiments, the reinforcing member 24 and the wall portion 22a can also be separate components, with the reinforcing member 24 connected to the bottom surface of the first groove 2212 via welding or bonding.

[0199] See Figure 3 and Figure 4 As shown, the wall portion 22a, on the side facing away from the first surface 2211 in the thickness direction X, also has a second surface 2213. The second surface 2213 and the first surface 2211 are the two sides of the wall portion 22a in the thickness direction X, respectively. Exemplarily, the second surface 2213 is the outer surface of the wall portion 22a facing away from the electrode assembly 23 in the thickness direction X. A liquid injection hole 2214 may also be provided on the second surface 2213 of the wall portion 22a. The liquid injection hole 2214 communicates with the receiving cavity 211 of the housing 21, so that electrolyte can be injected into the receiving cavity 211 of the housing 21 through the liquid injection hole 2214. It should be noted that in embodiments where the wall portion 22a is an end cap 22 and the end cap 22 includes a body portion 221 and an edge portion 222, the liquid injection hole 2214 is provided on the body portion 221.

[0200] In the embodiments of this application, the structure of the electrode assembly 23 can be various. The electrode assembly 23 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.

[0201] 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.

[0202] The electrode assembly 23 includes a main body 231 and tabs 232. The main body 231 is the primary component of the electrode assembly 23 for electrochemical reactions to occur within the battery cell 20. For example, in... Figure 4 In the middle, the tab 232 is connected to one end of the main body 231 facing the wall 22a in the thickness direction X of the wall, that is, in the thickness direction X of the wall, the tab 232 is located between the main body 231 and the wall 22a.

[0203] It should be noted that the tabs 232 of the electrode assembly 23 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 232 is the positive tab of the electrode assembly 23, then the tab 232 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 232 is the negative tab of the electrode assembly 23, then the tab 232 is formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer.

[0204] Optionally, the electrode assembly 23 housed within the receiving cavity 211 of the housing 21 can be one or more. For example, in... Figure 4 In this embodiment, the receiving cavity 211 of the housing 21 is provided with only one electrode assembly 23. Of course, in other embodiments, multiple electrode assemblies 23 can also be provided in the receiving cavity 211 of the housing 21. The multiple electrode assemblies 23 are stacked along the thickness direction of the battery cell 20, that is, the multiple electrode assemblies 23 are stacked along the second direction Z. For example, the number of electrode assemblies 23 contained in the receiving cavity 211 of the housing 21 can be two, three, four, five or six, etc.

[0205] In some embodiments, see Figure 3 and Figure 4As shown, the battery cell 20 may further include an electrode lead-out member 25, which is insulatedly mounted on the wall portion 22a and electrically connected to the electrode assembly 23 to output or input electrical energy from the battery cell 20. It should be noted that in embodiments where the wall portion 22a is an end cap 22 and the end cap 22 includes a body portion 221 and an edge portion 222, an electrode lead-out hole 2215 is provided on the body portion 221.

[0206] The wall portion 22a is also provided with an electrode lead-out hole 2215, which penetrates the wall portion 22a along the thickness direction X. At least a portion of the electrode lead-out member 25 is inserted into the electrode lead-out hole 2215 along the thickness direction X of the wall portion, so as to facilitate the electrical connection between the electrode lead-out hole 2215 and the electrode assembly 23.

[0207] It should be noted that the electrode lead-out 25 is insulated and mounted on the wall portion 22a, meaning that no electrical connection is formed between the electrode lead-out 25 and the wall portion 22a.

[0208] exist Figure 3 and Figure 4 In this battery cell 20, there are two electrode leads 25. Both electrode leads 25 are insulatedly mounted on the wall portion 22a and are spaced apart along the first direction Y. Correspondingly, the wall portion 22a is provided with two electrode lead holes 2215 arranged at intervals along the first direction Y. Each electrode lead 25 passes through one electrode lead hole 2215. Each electrode assembly 23 has two tabs 232 with opposite polarities. Both tabs 232 are connected to the end of the main body portion 231 facing the wall portion 22a in the thickness direction X of the wall portion and are spaced apart along the first direction Y. The two electrode leads 25 are electrically connected to the two tabs 232 of the electrode assembly 23 respectively to realize the input or output of electrical energy of the battery cell 20.

[0209] In some embodiments, the battery cell 20 may further include a pressure relief component for releasing the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0210] Optionally, the pressure relief component can be disposed on the end cap 22 or on the housing 21. Similarly, the pressure relief component and the housing 21 or end cap 22 can be integrally formed or separately disposed. If the pressure relief component and the housing 21 or end cap 22 are separately disposed, the pressure relief component can be connected to the housing 21 or end cap 22 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 housing 21 or end cap 22 are integrally formed, the pressure relief component is an area on the housing 21 or end cap 22 with a weak structure, such as an area on the housing 21 or end cap 22 with a groove.

[0211] In this embodiment, a first groove 2212 is provided on the first surface 2211 of the wall portion 22a to reduce the weight of the wall portion 22a. A reinforcing member 24 is provided on the bottom surface of the groove 2212, and the reinforcing member 24 is connected to the side surface of the groove 2212. The reinforcing member 24 and the wall portion 22a are integrally formed. The battery cell 20 with this structure can reduce the overall weight of the outer shell 20a of the battery cell 20 while not excessively affecting the structural strength of the wall portion 22a of the outer shell 20a. This can effectively alleviate the phenomenon of fatigue cracking or deformation damage of the wall portion 22a of the outer shell 20a when subjected to external impact or expansion of the battery cell 20 during use, thereby reducing the risk of the battery cell 20 bursting during use. In this way, the performance of the battery cell 20 is improved, and the stability and reliability of the battery cell 20 are also improved.

[0212] According to some embodiments of this application, see Figure 5 and Figure 6 As shown, the reinforcement 24 is configured to divide the first groove 2212 into a plurality of sub-grooves 2212e.

[0213] The reinforcing member 24 is connected to the side surface of the first groove 2212, and the reinforcing member 24 is configured to divide the first groove 2212 into multiple sub-grooves 2212e. That is, in the circumferential direction of the side surface of the first groove 2212, the reinforcing member 24 protruding from the bottom surface of the first groove 2212 is also connected to multiple positions of the side surface of the first groove 2212, so that the first groove 2212 is divided by the reinforcing member 24 to form multiple independent and spaced sub-grooves 2212e.

[0214] It should be noted that, see Figure 5As shown, along the thickness direction X of the wall portion, the groove depths of the multiple sub-grooves 2212e can be the same or different. Similarly, the groove depth of the sub-grooves 2212e can be the same as the groove depth of the first groove 2212 or less than the groove depth of the first groove 2212. For example, if the area of ​​the sidewall of a sub-grooves 2212e corresponding to the reinforcing member 24 is a structure that protrudes from the first surface 2211 in the thickness direction X of the wall portion or has one end face flush with the first surface 2211, then the groove depth of the sub-grooves 2212e is the same as the groove depth of the first groove 2212. If the area of ​​the sidewall of a sub-grooves 2212e corresponding to the reinforcing member 24 is a structure that does not exceed the first surface 2211 in the thickness direction X of the wall portion and is spaced apart from the first surface 2211, then the groove depth of the sub-grooves 2212e is less than the groove depth of the first groove 2212.

[0215] In this embodiment, by configuring the reinforcing member 24 to be connected to the groove side of the first groove 2212 and dividing the first groove 2212 into multiple sub-grooves 2212e, the reinforcing member 24 is configured to be connected to at least two positions of the groove side of the first groove 2212 at intervals along the circumferential direction. This further enhances the reinforcing effect of the reinforcing member 24 on the structural strength of the wall portion 22a. Consequently, while increasing the mass energy density of the battery cell 20, it can further alleviate the phenomenon of fatigue cracking or deformation damage of the wall portion 22a of the outer casing 20a when subjected to external impact or expansion of the battery cell 20 during use, thereby reducing the risk of the battery cell 20 bursting during use.

[0216] According to some embodiments of this application, see Figure 5 and Figure 6 As shown, the reinforcing member 24 may include a plurality of first reinforcing portions 241 arranged at intervals along the first direction Y. The first reinforcing portions 241 protrude from the bottom surface of the first groove 2212. The groove side surface of the first groove 2212 includes a first side surface 2212a and a second side surface 2212b arranged opposite to each other in 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. The first reinforcing portions 241 extend along the second direction Z, and the two ends of the first reinforcing portions 241 in the second direction Z are respectively connected to the first side surface 2212a and the second side surface 2212b.

[0217] The reinforcing member 24 may include a plurality of first reinforcing parts 241 arranged at intervals along the first direction Y. The first reinforcing parts 241 protrude from the bottom surface of the first groove 2212. That is, the second reinforcing part 242 is a part of the reinforcing member 24 used to strengthen the strength of the wall 22a, and each first reinforcing part 241 is a strip-shaped structure extending along the second direction Z.

[0218] The groove sides of the first groove 2212 include a first side 2212a and a second side 2212b disposed opposite to each other in the second direction Z. For example, the first groove 2212 is a rectangular groove structure. Correspondingly, the first side 2212a and the second side 2212b are two groove sides of the first groove 2212 disposed facing each other in the second direction Z.

[0219] The wall portion 22a 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 2212 onto a projection plane perpendicular to the thickness direction X of the wall portion is rectangular, with the length direction of the first groove 2212 being the first direction Y and the width direction of the first groove 2212 being the second direction Z.

[0220] The first reinforcing part 241 is connected to the first side surface 2212a and the second side surface 2212b at its two ends in the second direction Z, respectively. That is, the two opposite ends of the first reinforcing part 241 in the second direction Z are connected to the two groove sides of the first groove 2212 facing in the second direction Z.

[0221] For example, in Figure 5 and Figure 6 In the first groove 2212, four first reinforcing parts 241 are protruding on the bottom surface of the groove. The four first reinforcing parts 241 are arranged at intervals along the first direction Y. Of course, in other embodiments, the number of first reinforcing parts 241 protruding on the bottom surface of the first groove 2212 can also be two, three, five or six, etc.

[0222] In this embodiment, the reinforcing member 24 is provided with a plurality of first reinforcing portions 241 arranged at intervals along the first direction Y. The first reinforcing portions 241 extend along the second direction Z, and the two ends of the first reinforcing portions 241 in the second direction Z are respectively connected to the first side surface 2212a and the second side surface 2212b of the first groove 2212. This can improve the reinforcing effect of the reinforcing member 24 on the structural strength of the wall portion 22a, so as to alleviate the phenomenon of fatigue cracking or deformation damage when the wall portion 22a is subjected to external impact or expansion of the battery cell 20 during use. This can effectively reduce the risk of the battery cell 20 bursting during use, thereby improving the stability and reliability of the battery cell 20.

[0223] According to some embodiments of this application, see Figure 6 As shown, along the first direction Y, the width of the first reinforcing part 241 is W1, which satisfies 0.5mm≤W1≤3mm.

[0224] The width of the first reinforcing part 241 in the first direction Y is W1, that is, W1 is the width dimension of the first reinforcing part 241 in the plane perpendicular to the thickness direction X of the wall part in the direction perpendicular to its extension.

[0225] For example, the width W1 of the first reinforcing part 241 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.

[0226] In this embodiment, the width of the first reinforcing part 241 in the first direction Y is 0.5mm to 3mm. On the one hand, setting the width of the first reinforcing part 241 in the first direction Y to be greater than or equal to 0.5mm is beneficial to further enhance the reinforcing effect of the first reinforcing part 241 on the structural strength of the wall part 22a, so as to alleviate the phenomenon of fatigue cracking or deformation damage of the wall part 22a during use. On the other hand, setting the width of the first reinforcing part 241 in the first direction Y to be less than or equal to 3mm saves the space occupied by the first reinforcing part 241 in the first direction Y, which is beneficial to reduce the weight of the outer shell 20a and can reduce the molding difficulty of the first reinforcing part 241.

[0227] According to some embodiments of this application, please refer to Figure 5 and Figure 6 As shown, the reinforcing member 24 may further include a second reinforcing part 242, which protrudes from the bottom surface of the first groove 2212. Along the first direction Y, a second reinforcing part 242 is provided between every two adjacent first reinforcing parts 241, and the second reinforcing part 242 connects the two adjacent first reinforcing parts 241.

[0228] Along the first direction Y, a second reinforcing part 242 is provided between every two adjacent first reinforcing parts 241. That is, a second reinforcing part 242 protrudes from the bottom surface of the first groove 2212 in the area between every two adjacent first reinforcing parts 241.

[0229] The second reinforcing part 242 connects to two adjacent first reinforcing parts 241. That is, in the first direction Y, each reinforcing part is connected to its two adjacent first reinforcing parts 241.

[0230] In this embodiment, the reinforcing member 24 is further provided with a second reinforcing part 242. By providing a second reinforcing part 242 between each two adjacent first reinforcing parts 241, and the second reinforcing part 242 being connected to the two adjacent first reinforcing parts 241, it is possible to connect the multiple first reinforcing parts 241 of the reinforcing member 24 into a whole. This is beneficial to further enhance the reinforcing effect of the reinforcing member 24 on the structural strength of the wall 22a, so as to further alleviate the phenomenon of fatigue cracking or deformation damage when the wall 22a is subjected to external impact or expansion of the battery cell 20 during use. This can further reduce the risk of the battery cell 20 bursting during use, thereby further improving the stability and reliability of the battery cell 20.

[0231] According to some embodiments of this application, see Figure 6 As shown, the second reinforcing part 242 connects the first side surface 2212a and the second side surface 2212b. That is, the second reinforcing part 242 is connected to both sides of the first groove 2212 facing in the second direction Z.

[0232] In this embodiment, by connecting the second reinforcing part 242 to the first side surface 2212a and the second side surface 2212b of the first groove 2212, the reinforcing effect of the second reinforcing part 242 on the structural strength of the wall part 22a can be improved, and the stability and reliability of the second reinforcing part 242 protruding from the bottom surface of the first groove 2212 can be improved.

[0233] According to some embodiments of this application, see Figure 5 and Figure 6 As shown, the second reinforcing part 242 may include a main body region 2421 and a plurality of connecting ribs 2422, which are arranged at intervals along the circumference of the main body region 2421. The first side surface 2212a and the second side surface 2212b are both connected to the main body region 2421 through at least one connecting rib 2422, and two adjacent first reinforcing parts 241 are both connected to the main body region 2421 through at least one connecting rib 2422.

[0234] In the projection plane perpendicular to the thickness direction X of the wall, the area of ​​the orthographic projection of the main body area 2421 is greater than the area of ​​the orthographic projection of the connecting rib 2422.

[0235] Multiple connecting ribs 2422 are arranged at intervals along the circumference of the main body area 2421, that is, the multiple connecting ribs 2422 are a structure surrounding the main body area 2421, and the multiple connecting ribs 2422 are all connected to the outer circumferential surface of the main body area 2421.

[0236] For example, the connecting rib 2422 is a strip structure, a portion of the connecting ribs 2422 are structures that extend along the first direction Y, and another portion of the connecting ribs 2422 are structures that extend along the second direction Z.

[0237] Both the first side 2212a and the second side 2212b are connected to the main body area 2421 through at least one connecting rib 2422. That is, the first side 2212a is a structure that is connected to the main body area 2421 through at least one connecting rib 2422 so as to realize the connection between the second reinforcing part 242 and the first side 2212a. Similarly, the second side 2212b is a structure that is connected to the main body area 2421 through at least one connecting rib 2422 so as to realize the connection between the second reinforcing part 242 and the second side 2212b.

[0238] Optionally, the first side 2212a may be connected to the main body area 2421 by a connecting rib 2422 or by multiple connecting ribs 2422. Similarly, the second side 2212b may be connected to the main body area 2421 by a connecting rib 2422 or by multiple connecting ribs 2422.

[0239] Each of the two adjacent first reinforcing parts 241 is connected to the main body area 2421 by at least one connecting rib 2422. That is, each of the two first reinforcing parts 241 adjacent to the second reinforcing part 242 is a structure that is connected to the main body area 2421 by at least one connecting rib 2422, so as to realize the connection between the second reinforcing part 242 and the adjacent first reinforcing part 241.

[0240] Optionally, the first reinforcing part 241 may be connected to the main body area 2421 by a connecting rib 2422 or by multiple connecting ribs 2422.

[0241] In this embodiment, the second reinforcing part 242 is provided with a main body area 2421 and a plurality of connecting ribs 2422 arranged around the main body area 2421. The first side 2212a and the second side 2212b are both connected to the main body area 2421 through at least one connecting rib 2422, and two adjacent first reinforcing parts 241 are both connected to the main body area 2421 through at least one connecting rib 2422, so that the second reinforcing part 242 connects two adjacent first reinforcing parts 241, the first side 2212a and the second side 2212b. The second reinforcing part 242 with this structure can further improve the overall structural strength of the reinforcing member 24, which is conducive to further improving the reinforcing effect of the reinforcing member 24 on the structural strength of the wall part 22a.

[0242] According to some embodiments of this application, see Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, at least one second reinforcing part 242 has an electrode lead-out hole 2215 in its main body area 2421. The battery cell 20 also includes an electrode lead-out member 25. Along the thickness direction X of the wall, at least a portion of the electrode lead-out member 25 passes through the electrode lead-out hole 2215, and the electrode lead-out member 25 is electrically connected to the electrode assembly 23.

[0243] In this embodiment, at least one of the main body regions 2421 of the second reinforcing part 242 is provided with an electrode lead-out hole 2215, that is, an electrode lead-out hole 2215 is provided on the wall part 22a that penetrates the wall part 22a along the thickness direction X of the wall part, and the electrode lead-out hole 2215 is a structure provided corresponding to the main body region 2421 of the second reinforcing part 242. In other words, the main body region 2421 has a fifth surface 2421a facing the electrode assembly 23 in the thickness direction X of the wall part, and the electrode lead-out hole 2215 penetrates the fifth surface 2421a of the main body region 2421.

[0244] In an embodiment where the wall portion 22a has two electrode lead-out holes 2215, the bottom surface of the first groove 2212 of the wall portion 22a is provided with at least two second reinforcing portions 242, and each electrode lead-out hole 2215 passes through the main body area 2421 of a second reinforcing portion 242, so that the electrode lead-out member 25 is installed in the area where the bottom surface of the first groove 2212 of the wall portion 22a is provided with the main body area 2421 of the second reinforcing portion 242.

[0245] In this embodiment, by setting the electrode lead-out hole 2215 of the wall portion 22a for mounting the electrode lead-out member 25 to a structure located on the main body region 2421 of the second reinforcing portion 242, the area of ​​the wall portion 22a for mounting the electrode lead-out member 25 corresponds to the structure of the main body region 2421 of the second reinforcing portion 242. This improves the structural strength of the area of ​​the wall portion 22a for mounting the electrode lead-out member 25, which is beneficial to improving the structural stability of the electrode lead-out member 25 assembled on the wall portion 22a. It also reduces the risk of deformation or cracking in the area of ​​the wall portion 22a where the electrode lead-out hole 2215 is located during use, thereby improving the stability and reliability of the battery cell 20.

[0246] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 6 As shown, at least one of the main body regions 2421 of the second reinforcing part 242 is provided with a liquid injection hole 2214.

[0247] The wall portion 22a is provided with a liquid injection hole 2214 that penetrates the wall portion 22a along the thickness direction X. The liquid injection hole 2214 corresponds to the structure provided in the main body region 2421 of the second reinforcing portion 242. That is, the main body region 2421 has a fifth surface 2421a facing the electrode assembly 23 in the thickness direction X of the wall portion, and the liquid injection hole 2214 penetrates the fifth surface 2421a of the main body region 2421.

[0248] The electrolyte injection hole 2214 communicates with the receiving cavity 211 of the housing 21 to enable the injection of electrolyte into the receiving cavity 211 of the housing 21. In some embodiments, the battery cell 20 may also include an injection plug (not shown in the figure), which is disposed on the wall 22a and blocks the injection hole 2214.

[0249] 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 22a can be various, such as welded connection, snap-fit, or interference fit.

[0250] It should be noted that in the embodiment where both electrode lead-out holes 2215 and liquid injection holes 2214 are provided on the wall portion 22a, the electrode lead-out holes 2215 and liquid injection holes 2214 are respectively provided on the main body area 2421 of different second reinforcing portions 242.

[0251] In this embodiment, by setting the liquid injection hole 2214 of the wall portion 22a for liquid injection to a structure located on the main body region 2421 of the second reinforcing portion 242, the area of ​​the wall portion 22a where the liquid injection hole 2214 is provided corresponds to the structure of the main body region 2421 of the second reinforcing portion 242. This can improve the structural strength of the area of ​​the wall portion 22a where the liquid injection hole 2214 is provided, which helps to reduce the risk of deformation or cracking in the area of ​​the wall portion 22a where the liquid injection hole 2214 is provided during use, thereby improving the stability and reliability of the battery cell 20.

[0252] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 6 As shown, there are multiple second reinforcing portions 242. Each of the main body regions 2421 of two second reinforcing portions 242 is provided with an electrode lead-out hole 2215. The battery cell 20 also includes two electrode leads 25 with opposite polarities. Along the thickness direction X of the wall, at least a portion of each electrode lead 25 passes through an electrode lead-out hole 2215, and both electrode leads 25 are electrically connected to the electrode assembly 23. Along the first direction Y, a second reinforcing portion 242 with an injection hole 2214 is located between the two second reinforcing portions 242 with electrode lead-out holes 2215.

[0253] In this embodiment, three second reinforcing parts 242 are protruding from the bottom surface of the first groove 2212 of the wall portion 22a. The three second reinforcing parts 242 are arranged at intervals along the first direction Y. One second reinforcing part 242 is provided between every two adjacent first reinforcing parts 241 in the first direction Y. Correspondingly, the liquid injection hole 2214 and the two electrode lead-out holes 2215 are respectively provided on the main body area 2421 of the three second reinforcing parts 242. Of course, in other embodiments, the number of second reinforcing parts 242 protruding from the bottom surface of the first groove 2212 of the wall portion 22a can also be four, five, six or seven, etc.

[0254] The two electrode lead-out holes 2215 are used to install two electrode lead-out pieces 25 with opposite polarities, and the two electrode lead-out pieces 25 are respectively connected to the two tabs 232 of the electrode assembly 23 to realize the input or output of electrical energy of the battery cell 20.

[0255] Along the first direction Y, a second reinforcing part 242 with an injection hole 2214 is located between two second reinforcing parts 242 with electrode lead-out holes 2215. That is, the injection hole 2214 and the two electrode lead-out holes 2215 are arranged at intervals along the first direction Y, and the injection hole 2214 is located between the two electrode lead-out holes 2215 in the first direction Y, so that the second reinforcing part 242 with an injection hole 2214 is located between the two second reinforcing parts 242 with electrode lead-out holes 2215 in the first direction Y.

[0256] In this embodiment, two electrode lead-out holes 2215 are provided on the wall portion 22a, and in the first direction Y, a second reinforcing portion 242 with an injection hole 2214 is located between the two second reinforcing portions 242 with electrode lead-out holes 2215. On the one hand, this optimizes the layout of the areas with injection holes 2214 and two electrode lead-out holes 2215 on the wall portion 22a, which is beneficial to improving the regularity of the battery cell 20. On the other hand, it enables the areas with injection holes 2214 and two electrode lead-out holes 2215 on the wall portion 22a to be separated by the first reinforcing portion 241, thereby reducing the stress influence between the areas with injection holes 2214 and two electrode lead-out holes 2215 on the wall portion 22a, which is beneficial to improving the stability of the battery cell 20 in use.

[0257] According to some embodiments of this application, see Figure 6 As shown, the width of the connecting rib 2422 is W2, which satisfies 0.5mm≤W2≤3mm.

[0258] The connecting rib 2422 is a strip-shaped structure. Correspondingly, the width W2 of the connecting rib 2422 is the width dimension of the connecting rib 2422 perpendicular to its extension direction in a plane perpendicular to the thickness direction X of the wall. If the connecting rib 2422 is a strip-shaped structure extending along the first direction Y, then W2 is the width dimension of the connecting rib 2422 in the second direction Z; if the connecting rib 2422 is a strip-shaped structure extending along the second direction Z, then W2 is the width dimension of the connecting rib 2422 in the first direction Y.

[0259] For example, the width W2 of the connecting rib 2422 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.

[0260] In this embodiment, the width of the connecting rib 2422 is 0.5mm to 3mm. On the one hand, setting the width of the connecting rib 2422 to be greater than or equal to 0.5mm is beneficial to further enhance the structural strength of the wall 22a by the connecting rib 2422, so as to alleviate the phenomenon of fatigue cracking or deformation damage of the wall 22a during use. On the other hand, setting the width of the connecting rib 2422 to be less than or equal to 3mm saves the space occupied by the connecting rib 2422, which is beneficial to reduce the weight of the outer shell 20a and can reduce the molding difficulty of the connecting rib 2422.

[0261] According to some embodiments of this application, see Figure 5 and Figure 6 As shown, the groove side of the first groove 2212 also includes a third side surface 2212c and a fourth side surface 2212d disposed opposite each other in the first direction Y. A plurality of first reinforcing portions 241 are located between the third side surface 2212c and the fourth side surface 2212d in the first direction Y. The reinforcing member 24 also includes a plurality of third reinforcing portions 243, which protrude from the bottom surface of the first groove 2212 and extend along the first direction Y. Along the first direction Y, the first reinforcing portion 241 closest to the third side surface 2212c is connected to the third side surface 2212c via at least one third reinforcing portion 243, and the first reinforcing portion 241 closest to the fourth side surface 2212d is connected to the fourth side surface 2212d via at least one third reinforcing portion 243.

[0262] The groove side of the first groove 2212 also includes a third side 2212c and a fourth side 2212d disposed opposite to each other in the first direction Y. For example, the first groove 2212 is a rectangular groove structure. Correspondingly, the third side 2212c and the fourth side 2212d are two groove side surfaces of the first groove 2212 disposed facing each other in the first direction Y.

[0263] It should be noted that in embodiments where the groove side of the first groove 2212 also includes a first side surface 2212a and a second side surface 2212b arranged opposite to each other along the second direction Z, the first side surface 2212a, the third side surface 2212c, the second side surface 2212b and the fourth side surface 2212d are connected end to end in sequence. Optionally, the first side surface 2212a and the third side surface 2212c, the third side surface 2212c and the second side surface 2212b, the second side surface 2212b and the fourth side surface 2212d, and the fourth side surface 2212d and the first side surface 2212a can be directly connected or indirectly connected. In the embodiments of this application, the first side surface 2212a and the third side surface 2212c, the third side surface 2212c and the second side surface 2212b, the second side surface 2212b and the fourth side surface 2212d, and the fourth side surface 2212d and the first side surface 2212a are all connected by rounded corner surfaces.

[0264] Multiple first reinforcing parts 241 are located between the third side surface 2212c and the fourth side surface 2212d in the first direction Y. That is, the multiple first reinforcing parts 241 are arranged at intervals between the third side surface 2212c and the fourth side surface 2212d along the first direction Y, and both the third side surface 2212c and the fourth side surface 2212d are spaced apart from the first reinforcing parts 241.

[0265] Along the first direction Y, the first reinforcing part 241 closest to the third side 2212c among the plurality of first reinforcing parts 241 is connected to the third side 2212c through at least one third reinforcing part 243, and the first reinforcing part 241 closest to the fourth side 2212d among the plurality of first reinforcing parts 241 is connected to the fourth side 2212d through at least one third reinforcing part 243. That is, the two first reinforcing parts 241 located on both sides of the plurality of first reinforcing parts 241 in the first direction Y are respectively connected to the third side 2212c and the fourth side 2212d through at least one third reinforcing part 243.

[0266] For example, in Figure 6In this embodiment, the first reinforcing part 241 closest to the third side 2212c among the plurality of first reinforcing parts 241 is connected to the third side 2212c through a third reinforcing part 243, and the first reinforcing part 241 closest to the fourth side 2212d among the plurality of first reinforcing parts 241 is connected to the fourth side 2212d through a third reinforcing part 243. Of course, in other embodiments, the first reinforcing part 241 closest to the third side 2212c among the plurality of first reinforcing parts 241 can also be connected to the third side 2212c through a plurality of third reinforcing parts 243, and the plurality of third reinforcing parts 243 located between the third side 2212c and the first reinforcing part 241 are arranged at intervals along the second direction Z. Similarly, the first reinforcing part 241 closest to the fourth side 2212d among the plurality of first reinforcing parts 241 can also be connected to the fourth side 2212d through a plurality of third reinforcing parts 243, and the plurality of third reinforcing parts 243 located between the fourth side 2212d and the first reinforcing part 241 are arranged at intervals along the second direction Z.

[0267] In this embodiment, the reinforcing member 24 is further provided with a plurality of third reinforcing parts 243. By setting the first reinforcing part 241 closest to the third side 2212c among the plurality of first reinforcing parts 241 arranged at intervals along the first direction Y to be connected to the third side 2212c through at least one third reinforcing part 243, and setting the first reinforcing part 241 closest to the fourth side 2212d among the plurality of first reinforcing parts 241 arranged at intervals along the first direction Y to be connected to the fourth side 2212d through at least one third reinforcing part 243, it is possible to achieve that the two first reinforcing parts 241 located on both sides in the first direction Y are connected to the groove side of the first groove 2212 to form a whole. This is beneficial to further improve the reinforcing effect of the reinforcing member 24 on the structural strength of the wall 22a, so as to further alleviate the phenomenon of fatigue cracking or deformation damage when the wall 22a 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.

[0268] According to some embodiments of this application, see Figure 6 As shown, along the second direction Z, the width of the third reinforcing part 243 is W3, which satisfies 0.5mm≤W3≤3mm.

[0269] The width of the third reinforcing part 243 in the second direction Z is W3, that is, W3 is the width dimension of the third reinforcing part 243 in the plane perpendicular to the thickness direction X of the wall part in the direction perpendicular to its extension.

[0270] For example, the width W3 of the third reinforcing part 243 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.

[0271] In this embodiment, the width of the third reinforcing part 243 in the second direction Z is 0.5mm to 3mm. On the one hand, setting the width of the third reinforcing part 243 in the second direction Z to be greater than or equal to 0.5mm is beneficial to further enhance the reinforcing effect of the third reinforcing part 243 on the structural strength of the wall part 22a, so as to alleviate the phenomenon of fatigue cracking or deformation damage of the wall part 22a during use. On the other hand, setting the width of the third reinforcing part 243 in the second direction Z to be less than or equal to 3mm saves the space occupied by the third reinforcing part 243 in the second direction Z, which is beneficial to reduce the weight of the outer shell 20a and can reduce the molding difficulty of the third reinforcing part 243.

[0272] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 6 As shown, in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the wall portion 22a is rectangular, and the dimension of the orthographic projection of the wall portion 22a in the first direction Y is greater than the dimension of the orthographic projection of the wall portion 22a 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 22a is the first direction Y, and the width direction of the orthographic projection of the wall portion 22a is the second direction Z. That is to say, the wall portion 22a is a rectangular plate-like structure, and correspondingly, the first direction Y is the length direction of the wall portion 22a, and the second direction Z is the width direction of the wall portion 22a.

[0273] In this embodiment, by setting the projection of the wall portion 22a on the thickness direction X of the wall portion as a rectangular structure, and the length direction of the wall portion 22a is the arrangement direction of the plurality of first reinforcing portions 241, and the width direction of the wall portion 22a is the extension direction of the first reinforcing portions 241, the battery cell 20 with this structure can reduce the difficulty of setting the plurality of first reinforcing portions 241 arranged at intervals along the first direction Y on the bottom surface of the first groove 2212, and can improve the reinforcing effect of the plurality of first reinforcing portions 241 on the structural strength of the wall portion 22a.

[0274] According to some embodiments of this application, see Figure 5 , Figure 6 and Figure 7 As shown, along the thickness direction X of the wall portion, the side of the wall portion 22a away from the first surface 2211 also has a second surface 2213, the distance between the second surface 2213 and the first surface 2211 is D, and the groove depth of the first groove 2212 is H, satisfying 0.05≤H / D≤0.875.

[0275] Wherein, the first surface 2211 and the second surface 2213 are respectively the two sides of the wall portion 22a in its thickness direction. For example, in the embodiment of this application, the first surface 2211 is the inner surface of the wall portion 22a facing the electrode assembly 23 in the thickness direction X of the wall portion, and correspondingly, the second surface 2213 is the outer surface of the wall portion 22a away from the electrode assembly 23 in the thickness direction X of the wall portion.

[0276] Along the thickness direction X of the wall portion, the distance between the second surface 2213 and the first surface 2211 is D. That is, the wall thickness of the area of ​​the wall portion 22a used to provide the first groove 2212 is D. In an embodiment where the wall portion 22a is an end cap 22 and the end cap 22 includes a body portion 221 and an edge portion 222, then D is the wall thickness of the body portion 221. Wherein, 0.05≤H / D≤0.875, that is, the groove depth of the first groove 2212 provided on the first surface 2211 is 0.05 to 0.875 of the wall thickness of the body portion 221 of the end cap 22.

[0277] For example, H / 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.

[0278] In this embodiment, by setting the ratio of the groove depth of the first groove 2212 to the distance between the first surface 2211 and the second surface 2213 to 0.05 to 0.875, the groove depth of the first groove 2212 is 0.05 to 0.875 of the wall thickness of the area of ​​the wall portion 22a where the first groove 2212 is located. On the one hand, this can improve the weight reduction effect of the first groove 2212 on the wall portion 22a, which is beneficial to reduce the overall weight of the outer casing 20a and improve the weight energy density of the battery cell 20. On the other hand, it can alleviate the phenomenon of weak structural strength in the area of ​​the wall portion 22a where the first groove 2212 is located, which is beneficial to improve the structural strength of the area of ​​the wall portion 22a where the first groove 2212 is located, thereby reducing the risk of deformation or cracking of the wall portion 22a during use.

[0279] In some embodiments, see Figure 7 As shown, 1mm≤D≤4mm.

[0280] 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.

[0281] In this embodiment, by setting the distance between the first surface 2211 and the second surface 2213 to 1mm to 4mm, the wall thickness of the area of ​​the wall portion 22a used to set the first groove 2212 is 1mm to 4mm. On the one hand, this can improve the structural strength of the wall portion 22a, thereby reducing the risk of deformation or cracking of the wall portion 22a during use, and also reduce the difficulty of opening the first groove 2212 on the first surface 2211 of the wall portion 22a. On the other hand, it can save the space occupied by the wall portion 22a and reduce the weight of the wall portion 22a.

[0282] According to some embodiments of this application, see Figure 5 , Figure 6 and Figure 7 As shown, along the thickness direction X of the wall portion, the reinforcing member 24 does not extend beyond the first surface 2211. That is to say, the reinforcing member 24 does not extend the first groove 2212 in the thickness direction X of the wall portion, so that the reinforcing member 24 is a structure that is entirely located within the first groove 2212.

[0283] In this embodiment, by setting the reinforcing member 24 to not extend beyond the first surface 2211 in the thickness direction X of the wall, the reinforcing member 24 is integrally housed within the first groove 2212, thereby reducing the interference between the reinforcing member 24 and other components inside the battery cell 20. Furthermore, the first groove 2212 provides a certain degree of protection for the reinforcing member 24, thereby reducing the wear and tear on the reinforcing member 24 during use.

[0284] In some embodiments, see Figure 7 As shown, along the thickness direction X of the wall, the groove depth of the first groove 2212 is H, and the thickness of the reinforcing member 24 protruding from the bottom surface of the first groove 2212 is T, satisfying that T≥0.15H.

[0285] Wherein, T is the thickness dimension of the reinforcing member 24 protruding from the bottom surface of the first groove 2212 in the thickness direction X of the wall.

[0286] For example, T 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 H.

[0287] In this embodiment, by setting the thickness of the reinforcing member 24 protruding from the bottom surface of the first groove 2212 in the thickness direction X of the wall portion to be greater than or equal to 0.15 times the groove depth of the first groove 2212, it is beneficial to improve the structural strength of the reinforcing member 24 itself, thereby further improving the reinforcing effect of the reinforcing member 24 on the structural strength of the wall portion 22a.

[0288] According to some embodiments of this application, see Figure 4 , Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, the outer casing 20a includes a housing 21 and an end cap 22. The housing 21 has an internal cavity 211, and one end of the housing 21 in the thickness direction X of the wall has an opening 212 communicating with the cavity 211. At least a portion of the electrode assembly 23 is accommodated within the cavity 211. At least a portion of the end cap 22 is inserted into the cavity 211 through the opening 212. The end cap 22 has a first outer peripheral surface 2216 that abuts against the inner peripheral surface of the housing 21, and the end cap 22 is welded to the housing 21. The wall portion 22a is the end cap 22. The minimum distance between the groove side of the first groove 2212 and the first outer peripheral surface 2216 is L1, satisfying 1mm ≤ L1 ≤ 5mm.

[0289] The first outer peripheral surface 2216 is the surface where the end cap 22 is inserted into the receiving cavity 211 of the housing 21 and abuts against the inner peripheral surface of the housing 21.

[0290] The minimum distance between the side surface of the first groove 2212 and the first outer peripheral surface 2216 is L1, that is, the minimum distance between the part of the end cap 22 inserted into the receiving cavity 211 of the housing 21 and the surface of the inner peripheral surface of the housing 21 that abuts against each other and the side surface of the first groove 2212 in the direction perpendicular to the thickness direction X of the wall is L1.

[0291] It should be noted that in the embodiment where the end cap 22 includes a body portion 221 and an edge portion 222, and the body portion 221 is inserted into the receiving cavity 211, the outer peripheral surface of the body portion 221 is the first outer peripheral surface 2216. Correspondingly, L1 is the minimum distance between the outer peripheral surface of the body portion 221 and the groove side surface of the first groove 2212 in the direction perpendicular to the thickness direction X of the wall portion.

[0292] For example, the minimum distance L1 between the groove side surface of the first groove 2212 and the first outer peripheral surface 2216 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.

[0293] In this embodiment, the wall portion 22a is an end cap 22 in the outer shell 20a used to close the opening 212 and weld it to the shell 21. By setting the minimum distance between the groove side of the first groove 2212 and the first outer peripheral surface 2216 of the end cap 22 to 1mm to 5mm, on the one hand, the thickness of the portion of the end cap 22 located between the groove side of the first groove 2212 and the first outer peripheral surface 2216 can be increased, thereby reducing the influence of the first groove 2212 on the welding position of the end cap 22 and the shell 21. This can effectively improve the welding penetration between the end cap 22 and the shell 21, which is beneficial to improving the welding stability and welding quality between the end cap 22 and the shell 21. On the other hand, it can alleviate the phenomenon that the area where the first groove 2212 is set on the end cap 22 is limited due to the excessive minimum distance between the groove side of the first groove 2212 and the first outer peripheral surface 2216 of the end cap 22. This can reduce the difficulty of setting the first groove 2212 on the first surface 2211 of the end cap 22 and alleviate the phenomenon of poor weight reduction effect of the end cap 22.

[0294] In some embodiments, see Figure 7 As shown, 1.5mm≤L1≤4mm.

[0295] In this embodiment, by further setting the minimum distance between the groove side of the first groove 2212 and the first outer peripheral surface 2216 of the end cap 22 to 1.5mm to 4mm, on the one hand, the thickness of the portion of the end cap 22 located between the groove side of the first groove 2212 and the first outer peripheral surface 2216 can be further increased, thereby further reducing the influence of the first groove 2212 on the welding position of the end cap 22 and the shell 21, thus further improving the welding penetration between the end cap 22 and the shell 21, which is beneficial to further improving the welding stability and welding quality between the end cap 22 and the shell 21. On the other hand, it can further alleviate the phenomenon of limited area for setting the first groove 2212 on the end cap 22, thereby further reducing the difficulty of setting the first groove 2212 on the first surface 2211 of the end cap 22, and further alleviating the phenomenon of poor weight reduction effect of the end cap 22.

[0296] According to some embodiments of this application, see Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, the end cap 22 may include a body portion 221 and an edge portion 222. Along the thickness direction X of the wall portion, a portion of the body portion 221 is inserted into the receiving cavity 211 through the opening 212. The body portion 221 has a first outer peripheral surface 2216 and a first surface 2211. The edge portion 222 protrudes from the first outer peripheral surface 2216 and abuts against the end of the housing 21 where the opening 212 is provided along the thickness direction X of the wall portion.

[0297] The body portion 221 has a first outer peripheral surface 2216, that is, the body portion 221 is the part of the end cap 22 inserted into the receiving cavity 211, and the outer peripheral surface of the body portion 221 is the surface on which the end cap 22 and the inner peripheral surface of the housing 21 abut against each other.

[0298] The body portion 221 has a first surface 2211, that is, the inner surface of the body portion 221 facing the electrode assembly 23 in the thickness direction X of the wall portion is the first surface 2211 of the wall portion 22a. Similarly, the outer surface of the body portion 221 facing away from the electrode assembly 23 in the thickness direction X of the wall portion is the second surface 2213 of the wall portion 22a.

[0299] It should be noted that the first outer peripheral surface 2216 and the first surface 2211 can be directly connected or indirectly connected. For example, in... Figure 7 In the middle, the first outer peripheral surface 2216 and the first surface 2211 are connected by a chamfered surface.

[0300] The edge portion 222 protrudes from the first outer peripheral surface 2216, that is, the edge portion 222 is a structure that is connected to the first outer peripheral surface 2216 of the body portion 221 and protrudes from the first outer peripheral surface 2216.

[0301] The edge portion 222 abuts against the end of the housing 21 with the opening 212 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 21 with the opening 212 abuts against the edge portion 222.

[0302] For example, in Figure 7 In the middle, along the thickness direction X of the wall portion, the body portion 221 has a second surface 2213 that is away from the electrode assembly 23, and the surface of the edge portion 222 that is away from the housing 21 is coplanar with the second surface 2213.

[0303] In this embodiment, the end cap 22 is provided with a body portion 221 and an edge portion 222. The body portion 221 has a first outer peripheral surface 2216 that abuts against the inner peripheral surface of the housing 21 and a first surface 2211 for providing a first groove 2212. By setting the edge portion 222 of the end cap 22 to be protruding on the first outer peripheral surface 2216 and abutting against the end of the housing 21 with an opening 212 along the thickness direction X of the wall portion, the body portion 221 of the end cap 22 can close the opening 212 and provide the first groove 2212, while the edge portion 222 can also play a certain limiting and positioning role for the body portion 221. This helps to reduce the assembly difficulty between the end cap 22 and the housing 21 and improve the assembly quality between the end cap 22 and the housing 21.

[0304] In some embodiments, see Figure 5 , Figure 6 and Figure 7 As shown, the edge portion 222 is a ring-shaped structure surrounding the body portion 221. That is, the edge portion 222 is a ring-shaped structure that extends circumferentially along the body portion 221 and is connected end to end.

[0305] It should be noted that in other embodiments, the edge portion 222 may also be other structures. For example, the edge portion 222 may be a plurality of protruding structures protruding on the first outer peripheral surface 2216, and the plurality of protruding structures are arranged at intervals along the circumferential direction of the body portion 221.

[0306] In this embodiment, by setting the edge portion 222 as an annular structure surrounding the outer side of the body portion 221, the effect of the edge portion 222 in limiting and positioning the body portion 221 can be further improved. On the one hand, the assembly difficulty between the end cap 22 and the housing 21 can be further reduced, and the assembly quality between the end cap 22 and the housing 21 can be further improved. On the other hand, the sealing effect of the end cap 22 on the opening 212 of the housing 21 can be improved, thereby reducing the risk of leakage of the battery cell 20 during use.

[0307] In some embodiments, the Vickers hardness of the area of ​​the wall portion 22a where the first groove 2212 is not provided on the first surface 2211 is HV1, and the Vickers hardness of the area of ​​the wall portion 22a where the first groove 2212 is provided on the first surface 2211 is HV2, satisfying that 1≤HV2-HV1≤10.

[0308] If the reinforcing member 24 and the wall portion 22a are integrally formed, then the reinforcing member 24 is part of the wall portion 22a, such that the area of ​​the wall portion 22a where the reinforcing member 24 is provided is also part of the area of ​​the wall portion 22a where the first groove 2212 is formed on the first surface 2211. Correspondingly, the Vickers hardness of the bottom wall of the first groove 2212 and the Vickers hardness of the area of ​​the wall portion 22a where the reinforcing member 24 is provided are both greater than the Vickers hardness of the area of ​​the wall portion 22a where the first groove 2212 is not formed on the first surface 2211. If the reinforcing member 24 and the wall portion 22a are separate structures, then the Vickers hardness of the bottom wall of the first groove 2212 is greater than the Vickers hardness of the area of ​​the wall portion 22a where the first groove 2212 is not formed on the first surface 2211.

[0309] For example, the Vickers hardness HV1 of the area of ​​the wall portion 22a corresponding to the area of ​​the first surface 2211 where the first groove 2212 is not formed is 32-34.

[0310] For example, in this embodiment of the application, the reinforcing member 24 and the wall portion 22a are integrally formed. Correspondingly, the Vickers hardness of the area of ​​the bottom wall of the first groove 2212 where the reinforcing member 24 is not provided is 36-38; the Vickers hardness of the area of ​​the bottom wall of the first groove 2212 where the first reinforcing part 241 is provided is 34-36; the Vickers hardness of the area of ​​the bottom wall of the first groove 2212 where the connecting rib 2422 of the second reinforcing part 242 is provided is 34-36; the Vickers hardness of the area of ​​the bottom wall of the first groove 2212 where the main body area 2421 of the second reinforcing part 242 is provided is 37-39; and the Vickers hardness of the area of ​​the bottom wall of the first groove 2212 where the third reinforcing part 243 is provided is 34-36. It should be noted that the test method for Vickers hardness of different regions of wall 22a can refer to the test method for Vickers hardness of metals in the national standard GB / T 4340.1-2009. When testing each region, multiple measurement points set at intervals can be selected to measure the Vickers hardness and then the average value is taken.

[0311] In this embodiment, by setting the Vickers hardness of the area of ​​the wall portion 22a corresponding to the first surface 2211 where the first groove 2212 is formed to be 1 to 10 greater than the Vickers hardness of the area of ​​the wall portion 22a corresponding to the first surface 2211 where the first groove 2212 is not formed, the structure of the area of ​​the wall portion 22a where the first groove 2212 is formed can be formed by stamping. The battery cell 20 with this structure can reduce the forming difficulty of the wall portion 22a, thereby reducing the manufacturing difficulty of the battery cell 20. On the other hand, it can effectively improve the structural strength of the thinned area of ​​the wall portion 22a, thereby reducing the risk of deformation or cracking in the area of ​​the wall portion 22a where the first groove 2212 is set during use.

[0312] According to some embodiments of this application, see Figure 8 and Figure 9 As shown, along the thickness direction X of the wall portion, the first surface 2211 is disposed facing the electrode assembly 23. That is, the first surface 2211 is the inner surface of the wall portion 22a facing the electrode assembly 23 in its thickness direction, i.e., the first groove 2212 is disposed on the side of the wall portion 22a facing the electrode assembly 23.

[0313] It should be noted that in other embodiments, the first surface 2211 may also be the outer surface of the wall portion 22a away from the electrode assembly 23, and correspondingly, the first groove 2212 is disposed on the side of the wall portion 22a away from the electrode assembly 23.

[0314] In this embodiment, the first surface 2211 is the surface of the wall portion 22a facing the electrode assembly 23, so that the first groove 2212 is formed on the side of the wall portion 22a facing the electrode assembly 23. The battery cell 20 with this structure can reduce the accumulation of external impurities in the first groove 2212 and realize that the reinforcing member 24 is located inside the outer shell 20a, which is beneficial to reduce the wear of the reinforcing member 24 during use. On the other hand, it can realize the communication between the first groove 2212 and the internal space of the outer shell 20a, thereby effectively utilizing the space in the first groove 2212 and improving the space utilization rate of the battery cell 20.

[0315] According to some embodiments of this application, refer to Figure 4 , Figure 5 , Figure 7 , Figure 8 and Figure 9 Please refer to further details. Figure 10 and Figure 11 , Figure 10 This is a schematic diagram of the structure of the first insulating member 26 provided in some embodiments of this application. Figure 11This is an axial view of the first insulating member 26 provided in some embodiments of this application. The electrode assembly 23 includes a main body 231 and a tab 232, the tab 232 being connected to one end of the main body 231 facing the wall 22a in the thickness direction X of the wall. The battery cell 20 may further include an electrode lead 25 and a first insulating member 26, the electrode lead 25 being disposed in the wall 22a and including a first connecting portion 251 connected to the tab 232, the first insulating member 26 being disposed within the housing 20a, and at least a portion of the first insulating member 26 being located between the wall 22a and the first connecting portion 251. Along the thickness direction X of the wall portion, the first insulating member 26 has a third surface 261 facing away from the wall portion 22a and a fourth surface 262 facing the wall portion 22a. The third surface 261 is provided with a second groove 2611, and the fourth surface 262 is formed with a first protrusion 2621 corresponding to the position of the second groove 2611. At least a portion of the first protrusion 2621 is accommodated in the first groove 2212, and at least a portion of the first connecting portion 251 and at least a portion of the tab 232 are both accommodated in the second groove 2611.

[0316] The tab 232 is connected to the end of the main body 231 facing the wall 22a in the thickness direction X of the wall. That is, the tab 232 is connected to the main body 231, and the tab 232 is located between the wall 22a and the main body 231 in the thickness direction X of the wall.

[0317] In this embodiment, the electrode lead-out member 25 serves to electrically connect to the electrode assembly 23, 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.

[0318] The electrode lead-out member 25 includes a first connecting portion 251, which is connected to the tab 232. That is, part of the electrode lead-out member 25 is a structure that passes through the wall portion 22a, and the part of the electrode lead-out member 25 that is connected to the tab 232 of the electrode assembly 23 is the first connecting portion 251.

[0319] For example, the first connecting portion 251 of the electrode lead-out member 25 is located on the side of the wall portion 22a facing the electrode assembly 23 in the thickness direction X of the wall portion. Of course, in other embodiments, the first connecting portion 251 may also be a structure that is only partially located on the side of the wall portion 22a facing the electrode assembly 23 in the thickness direction X of the wall portion. Correspondingly, the other part of the first connecting portion 251 may be a structure that is inserted into the wall portion 22a.

[0320] Optionally, the connection structure between the first connecting part 251 and the electrode 232 can be various, such as welding connection or abutment connection.

[0321] See Figure 5 and Figure 9 As shown, an electrode lead-out hole 2215 is provided on the wall portion 22a. The electrode lead-out hole 2215 penetrates the wall portion 22a along the thickness direction X. A portion of the electrode lead-out member 25 is inserted into the electrode lead-out hole 2215, such that the electrode lead-out member 25 has a first connecting portion 251 located on the side of the wall portion 22a facing the electrode assembly 23.

[0322] For example, the electrode lead 25 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0323] exist Figure 3 , Figure 4 and Figure 5 In the battery cell 20, there are two electrode leads 25. The two electrode leads 25 are spaced apart on the wall portion 22a along the first direction Y. Correspondingly, each electrode assembly 23 has two tabs 232. The two tabs 232 are connected to the end of the main body portion 231 facing the wall portion 22a in the thickness direction X of the wall portion. The two tabs 232 have opposite polarities and are spaced apart along the first direction Y. That is, the two tabs 232 are the positive tab and the negative tab of the electrode assembly 23, respectively. The two electrode leads 25 are electrically connected to the two tabs 232 of the electrode assembly 23, respectively, so as to realize the input or output of electrical energy of the battery cell 20.

[0324] In this embodiment of the application, a portion of the first insulating member 26 is disposed between the wall portion 22a and the first connecting portion 251 to serve as an insulating barrier between the wall portion 22a and the first connecting portion 251. Furthermore, a portion of the first insulating member 26 is disposed between the wall portion 22a and the tab 232, so that the first insulating member 26 can also serve as an insulating barrier between the wall portion 22a and the tab 232.

[0325] The third surface 261 is the surface of the first insulating member 26 facing the electrode assembly 23 in the thickness direction X of the wall portion, and correspondingly, the fourth surface 262 is the surface of the first insulating member 26 facing away from the electrode assembly 23 in the thickness direction X of the wall portion.

[0326] The third surface 261 is provided with a second groove 2611, and the fourth surface 262 is provided with a first protrusion 2621 corresponding to the position of the second groove 2611. That is, the surface of the first insulating member 26 facing the electrode assembly 23 is provided with a second groove 2611, and the surface of the first insulating member 26 away from the electrode assembly 23 is provided with a first protrusion 2621 corresponding to the position of the second groove 2611, so that the first insulating member 26 has a structure in which the second groove 2611 is formed on one side and the first protrusion 2621 is formed on the other side.

[0327] At least a portion of the first protrusion 2621 is accommodated within the first groove 2212. That is, at least a portion of the first protrusion 2621 protruding from the fourth surface 262 of the first insulating member 26 is inserted into the first groove 2212 along the thickness direction X of the wall. It should be noted that in the embodiment where a reinforcing member 24 protrudes from the bottom surface of the first groove 2212, the reinforcing member 24 can be a structure surrounding the outer periphery of the first protrusion 2621, or a structure that abuts against the first protrusion 2621 along the thickness direction X of the wall.

[0328] For example, in this embodiment of the application, the first protrusion 2621 is inserted into the first groove 2212 along the thickness direction X of the wall portion. A portion of the reinforcing member 24 abuts against the first protrusion 2621 along the thickness direction X of the wall portion, and the portion of the reinforcing member 24 is located on the outer periphery of the first protrusion 2621. The portion of the reinforcing member 24 that abuts against the first protrusion 2621 protruding beyond the bottom surface of the groove 2212 in the thickness direction X of the wall portion is smaller than the portion of the reinforcing member 24 located on the outer periphery of the first protrusion 2621 protruding beyond the bottom surface of the groove 2212 in the thickness direction X of the wall portion.

[0329] Among them, the second reinforcing part 242 of the multiple second reinforcing parts 242 of the reinforcing member 24, which is provided with an electrode lead-out hole 2215, abuts against the first protrusion 2621 along the thickness direction X of the wall.

[0330] At least a portion of the first connecting portion 251 and at least a portion of the tab 232 are both accommodated in the second groove 2611. That is, the first connecting portion 251 of the electrode lead-out member 25 and the electrode assembly 23 are both located on the side of the first insulating member 26 away from the wall portion 22a. At least a portion of the first connecting portion 251 is inserted into the second groove 2611 provided on the third surface 261 of the first insulating member 26 along the thickness direction X of the wall portion. At least a portion of the tab 232 is inserted into the second groove 2611 provided on the third surface 261 of the first insulating member 26 along the thickness direction X of the wall portion.

[0331] It should be noted that, in combination Figure 4 , Figure 5 , Figure 9 , Figure 10 and Figure 11 As shown, in an embodiment where the battery cell 20 is provided with two electrode leads 25 and the electrode assembly 23 is provided with two tabs 232, the first insulating member 26 is provided with two second grooves 2611 and two first protrusions 2621. Each second groove 2611 is used to accommodate at least a portion of the first connecting portion 251 of an electrode lead 25 and at least a portion of a tab 232, and both first protrusions 2621 are inserted into the first groove 2212 along the thickness direction X of the wall.

[0332] In this embodiment, a second groove 2611 is provided on the third surface 261 of the first insulating member 26 facing away from the wall portion 22a, and a first protrusion 2621 is provided on the fourth surface 262 of the first insulating member 26 facing the wall portion 22a and corresponding to the position of the second groove 2611. By setting at least a portion of the first protrusion 2621 to be accommodated in the first groove 2212, and setting at least a portion of the first connecting portion 251 and at least a portion of the tab 232 to be accommodated in the second groove 2611, the structure is such that while satisfying the effect of the first insulating member 26 insulating and isolating the tab 232 and the wall portion 22a, as well as the effect of the first connecting portion 251 and the wall portion 22a, the first insulating member 26 and the wall portion 22a can also achieve the effect of the first insulating member 26 insulating and isolating the tab 232 and the wall portion 22a. 2a shares a portion of the space in the thickness direction X of the wall portion. While ensuring sufficient space between the first insulating member 26 and the main body portion 231 to accommodate the first connecting portion 251 and the electrode tab 232, it also enables the first insulating member 26 and the first connecting portion 251, as well as the first insulating member 26 and the electrode tab 232, to share a portion of the space in the thickness direction X of the wall portion. This reduces the phenomenon of the first insulating member 26 pressing down on the electrode tab 232 and satisfies the insulation isolation effect between the electrode tab 232 and the wall portion 22a. At the same time, it effectively increases the internal space of the battery cell 20 for accommodating the electrode assembly 23, which is beneficial to improving the internal space utilization rate of the battery cell 20 and thus improving the volumetric energy density of the battery cell 20.

[0333] According to some embodiments of this application, see Figure 9 and Figure 11 As shown, a limiting part 263 is protruding from the bottom surface of the second groove 2611, and the limiting part 263 surrounds the outer periphery of the first connecting part 251.

[0334] In this embodiment, the limiting part 263 and the first insulating member 26 are integrally formed. Of course, in other embodiments, the limiting part 263 and the first insulating member 26 can also be separate structures. The limiting part 263 can be connected to the bottom surface of the second groove 2611 by bonding or snap-fitting. Exemplarily, in this embodiment, the first insulating member 26 is formed by injection molding.

[0335] The limiting part 263 surrounds the outer periphery of the first connecting part 251, that is, the limiting part 263 is a structure that surrounds the first connecting part 251. Optionally, the limiting part 263 can be a variety of structures. For example, the limiting part 263 can be an annular structure that surrounds the first connecting part 251 and is connected end to end. Of course, the limiting part 263 can also include multiple convex hull structures that are arranged at intervals along the circumference of the first connecting part 251, and the multiple convex hull structures surround the first connecting part 251.

[0336] In this embodiment, by providing a limiting part 263 protruding from the bottom surface of the second groove 2611, and the limiting part 263 being a structure surrounding the first connecting part 251, the limiting part 263 can play a certain limiting and positioning role for the first connecting part 251. On the one hand, it can reduce the shaking phenomenon of the first connecting part 251 during use, which is conducive to improving the stability of the first connecting part 251 in the second groove 2611. On the other hand, it can reduce the difficulty of assembling at least part of the first connecting part 251 into the second groove 2611, thereby reducing the assembly difficulty between the first insulating member 26 and the electrode lead-out member 25, which is conducive to improving the assembly efficiency of the battery cell 20.

[0337] According to some embodiments of this application, see Figure 11 As shown, the limiting part 263 is a ring structure that extends circumferentially along the first connecting part 251. In other words, the limiting part 263 is a ring structure that surrounds the first connecting part 251 and is connected end to end.

[0338] In this embodiment, by setting the limiting part 263 as an annular structure surrounding the first connecting part 251, the effect of the limiting part 263 in limiting and positioning the first connecting part 251 can be further improved, and the difficulty of protruding the limiting part 263 on the bottom surface of the second groove 2611 can be reduced.

[0339] In some embodiments, see Figure 9 and Figure 11 As shown, the limiting portion 263 is configured to divide the second groove 2611 into a first groove 2611a and a second groove 2611b. The first groove 2611a is located inside the limiting portion 263, and the second groove 2611b is located outside the limiting portion 263, and the second groove 2611b is disposed around the first groove 2611a. At least a portion of the first connecting portion 251 is accommodated in the first groove 2611a, and at least a portion of the tab 232 is accommodated in the second groove 2611b.

[0340] The first groove 2611a is a groove structure formed by the bottom surface of the second groove 2611 and the inner peripheral surface of the limiting part 263. Correspondingly, the first groove 2611a is also the part located inside the limiting part 263 in the internal space of the second groove 2611. Similarly, the second groove 2611b is a groove structure formed by the bottom surface of the second groove 2611, the side surface of the second groove 2611, and the outer peripheral surface of the limiting part 263. Correspondingly, the second groove 2611b is also the part located outside the limiting part 263 in the internal space of the second groove 2611. Thus, the second groove 2611b is an annular groove structure surrounding the outside of the first groove 2611a.

[0341] It should be noted that the second groove 2611 of the first insulating member 26 is a structure provided on the third surface 261 of the first insulating member 26. If the limiting part 263 protrudes from the third surface 261 in the thickness direction X of the wall portion or the end face of the limiting part 263 away from the bottom surface of the groove of the second groove 2611 is flush with the third surface 261, then the groove depth of the first groove 2611a and the groove depth of the second groove 2611b are the same as the groove depth of the second groove 2611. If the limiting part 263 does not exceed the third surface 261 in the thickness direction X of the wall portion and is provided at intervals from the third surface 261, then the groove depth of the first groove 2611a and the groove depth of the second groove 2611b are both less than the groove depth of the second groove 2611.

[0342] At least a portion of the first connecting portion 251 is accommodated in the first groove 2611a, that is, at least a portion of the first connecting portion 251 is inserted into the second groove 2611 along the thickness direction X of the wall and is located on the inner peripheral side of the limiting portion 263.

[0343] At least a portion of the tab 232 is accommodated in the second groove 2611b, that is, at least a portion of the tab 232 is inserted into the second groove 2611 along the thickness direction X of the wall and is located on the outer periphery of the limiting portion 263.

[0344] In this embodiment, the limiting part 263 divides the second groove 2611 into a first groove 2611a located inside the limiting part 263 and a second groove 2611b located outside the limiting part 263, so that the second groove 2611b is a structure surrounding the outside of the first groove 2611a, and at least a portion of the first connecting part 251 and at least a portion of the tab 232 are respectively accommodated in the first groove 2611a and the second groove 2611b, so that the first groove 261a in the second groove 2611 is used to accommodate the first connecting part 251. 1a and the second groove 2611b for accommodating the tab 232 are independent structures. The battery cell 20 with this structure can reduce the interference between the first connecting part 251 and the tab 232. On the other hand, it can facilitate the assembly of at least a part of the first connecting part 251 and at least a part of the tab 232 into the second groove 2611. This helps to reduce the assembly difficulty between the electrode lead 25 and the first insulating part 26 and the electrode assembly 23 and the first insulating part 26, thereby improving the assembly efficiency of the battery cell 20.

[0345] According to some embodiments of this application, see Figure 4 , Figure 8 and Figure 9As shown, the tab 232 may include a connecting region 2321 and a bending region 2322. The connecting region 2321 is located on the side of the first connecting portion 251 opposite to the wall portion 22a in the thickness direction X of the wall portion and is connected to the first connecting portion 251. The bending region 2322 connects the connecting region 2321 and the main body portion 231. At least a portion of the bending region 2322 is accommodated within the second groove 2611 along the thickness direction X of the wall portion.

[0346] The connecting area 2321 is the region of the tab 232 located on the side of the first connecting portion 251 away from the wall portion 22a in the thickness direction X of the wall portion and connected to the first connecting portion 251, while the bending area 2322 is the bending structure of the tab 232 connecting the connecting area 2321 and the main body portion 231 of the electrode assembly 23.

[0347] For example, the connecting area 2321 and the first connecting portion 251 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 2321 and the first connecting portion 251 can also be abutment or snap-fit, etc.

[0348] At least a portion of the bending area 2322 is accommodated in the second groove 2611 along the thickness direction X of the wall portion. That is, the area of ​​the tab 232 bent to form the bending area 2322 is inserted into the second groove 2611 along the thickness direction X of the wall portion. It should be noted that in the embodiment where the first insulating member 26 is provided with a limiting part 263 and the limiting part 263 divides the second groove 2611 into a first groove 2611a and a second groove 2611b, at least a portion of the bending area 2322 of the tab 232 is inserted into the second groove 2611 along the thickness direction X of the wall portion and is located in the second groove 2611b.

[0349] In this embodiment, the tab 232 has a connection region 2321 located on the side of the first connecting portion 251 away from the wall portion 22a in the thickness direction X of the wall portion and connected to the first connecting portion 251. The tab 232 also has a bending region 2322 connecting the connection region 2321 and the main body portion 231 to realize the electrical connection between the electrode assembly 23 and the electrode lead-out member 25. By setting at least a portion of the bending region 2322 of the tab 232 to be accommodated in the second groove 2611 along the thickness direction X of the wall portion, the connection between the tab 232 and the first insulating member 26 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 26 and the main body 231 to accommodate the bending area 2322. This facilitates bending the tab 232 to connect the connection area 2321 of the tab 232 with the first connecting part 251, reducing the difficulty of bending the tab 232 and the assembly difficulty between the tab 232 and the first connecting part 251. On the other hand, it alleviates the phenomenon of the first insulating member 26 pressing down on the bending area 2322 of the tab 232, thus reducing the risk of damage to the bending area 2322 of the tab 232.

[0350] In some embodiments, see Figure 9 As shown, the bending area 2322 is bent to form multiple bending segments 2322a, which are connected in sequence. The bending segments 2322a at both ends of the multiple bending segments 2322a are connected to the connecting area 2321 and the main body 231, respectively.

[0351] The bending area 2322 is bent into multiple bending segments 2322a, which are connected in sequence. In other words, the bending area 2322 is a structure of bending in a local area, so that the bending area 2322 forms multiple bending segments 2322a connected in sequence, and each pair of adjacent bending segments 2322a is set at an acute angle, a right angle or an obtuse angle.

[0352] For example, in Figure 9 In the bending region 2322, four bending segments 2322a are formed by bending in sequence. The two bending segments 2322a at both ends of the four bending segments 2322a are connected to the connecting region 2321 and the main body 231, respectively. Of course, in other embodiments, the number of bending segments 2322a formed by bending in the bending region 2322 can also be two, three, five or six, etc.

[0353] In this embodiment, the bending area 2322 of the tab 232 is configured to be bent to form a plurality of sequentially connected bending segments 2322a, and the bending segments 2322a at both ends of the plurality of bending segments 2322a are respectively connected to the connecting area 2321 and the main body 231 to realize the bending structure of the tab 232. The battery cell 20 with this structure can reduce the difficulty of forming the bending area 2322 of the tab 232, so as to realize that the tab 232 has a connecting area 2321 on the side of the first connecting part 251 away from the wall part 22a in the thickness direction X of the wall part. On the other hand, the bending area 2322 can play a certain buffering role between the connecting area 2321 and the main body 231, which helps to reduce the phenomenon of rigid tension between the connecting area 2321 and the main body 231.

[0354] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 9 As shown, the battery cell 20 may include two electrode leads 25, which are spaced apart on the wall portion 22a along a first direction Y. The electrode assembly 23 includes two tabs 232 with opposite polarities, each tab 232 being connected to one end of the main body portion 231 facing the wall portion 22a in the thickness direction X of the wall portion, and the two tabs 232 are spaced apart along the first direction Y. Each tab 232 is connected to a first connecting portion 251 of an electrode lead 25. The bending region 2322 and the first connecting portion 251 are arranged along a second direction Z, and the thickness direction X of the wall portion, the first direction Y, and the second direction Z are perpendicular to each other.

[0355] The electrode assembly 23 is provided with two tabs 232 of opposite polarity, namely a positive tab and a negative tab. Correspondingly, each tab 232 is connected to the first connection part 251 of an electrode lead-out member 25 to realize the input or output of electrical energy of the battery cell 20.

[0356] For example, in this embodiment of the application, the battery cell 20 is cuboid, and correspondingly, the wall portion 22a is rectangular. The length direction of the wall portion 22a is the first direction Y, and the width direction of the wall portion 22a is the second direction Z. Correspondingly, the two electrode leads 25 and the two tabs 232 are both structures that are spaced apart along the length direction of the wall portion 22a. The bending area 2322 of the tab 232 and the first connecting portion 251 of the corresponding electrode lead 25 are arranged along the width direction of the wall portion 22a. That is, the bending area 2322 of the tab 232 is located on one side of the first connecting portion 251 of the corresponding electrode lead 25 in the second direction Z.

[0357] In this embodiment, the battery cell 20 is further provided with two electrode leads 25 arranged at intervals along the first direction Y, and the electrode assembly 23 is correspondingly provided with two tabs 232 arranged at intervals along the first direction Y. The two tabs 232 are respectively connected to the two electrode leads 25 to realize the input or output of electrical energy of the battery cell 20. In this embodiment, by setting the bending area 2322 of the tab 232 and the first connecting part 251 of the electrode lead 25 to be arranged along the second direction Z, the arrangement direction of the bending area 2322 and the first connecting part 251 is perpendicular to the arrangement direction of the two tabs 232. This facilitates the bending of the tabs 232 to form the bending section 2322a and reduces the assembly difficulty between the tabs 232 and the first connecting part 251. On the other hand, it optimizes the internal space arrangement of the battery cell 20, which is beneficial to improve the internal space utilization of the battery cell 20 and reduces the interference between the bending areas 2322 of the two tabs 232.

[0358] According to some embodiments of this application, in conjunction with Figure 6 and Figure 7 as well as Figure 9 and Figure 10 As shown, along the thickness direction X of the wall, the first protrusion 2621 abuts against the reinforcing member 24.

[0359] For example, among the plurality of second reinforcing portions 242 of the reinforcing member 24, the second reinforcing portion 242 with electrode lead-out holes 2215 abuts against the first protrusion 2621 along the thickness direction X of the wall portion, and among the plurality of first reinforcing portions 241 of the reinforcing member 24, the two first reinforcing portions 241 located on both sides in the first direction Y are respectively located on both sides of the first protrusion 2621 in the first direction Y, and the third reinforcing portion 243 is also a structure located on both sides of the first protrusion 2621 in the first direction Y.

[0360] In this embodiment, by setting the first protrusion 2621 protruding on the fourth surface 262 of the first insulating member 26 to abut against the reinforcing member 24 protruding on the bottom surface of the first groove 2212 along the thickness direction X of the wall portion, the assembly compactness between the wall portion 22a and the first insulating member 26 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 22a and the first insulating member 26 can be improved, so as to reduce the phenomenon of shaking or displacement of the first insulating member 26 inside the outer casing 20a.

[0361] According to some embodiments of this application, see Figure 8 , Figure 10 and Figure 11 As shown, the third surface 261 is provided with a second protrusion 2612, which abuts against the main body 231 along the thickness direction X of the wall portion.

[0362] The third surface 261 is provided with a second protrusion 2612, that is, the second protrusion 2612 protrudes from the surface of the first insulating member 26 where the second groove 2611 is provided.

[0363] Along the thickness direction X of the wall portion, the second protrusion 2612 abuts against the main body portion 231, that is, the second protrusion 2612 and the main body portion 231 of the electrode assembly 23 are arranged along the thickness direction X of the wall portion and abut against each other.

[0364] Optionally, the second protrusion 2612 protruding from the third surface 261 can be one or more. For example, in Figure 11 In the third surface 261, four second protrusions 2612 are provided, and at least some of the four second protrusions 2612 are spaced apart along the first direction Y. Of course, in other embodiments, the second protrusions 2612 on the third surface 261 can also be two, three, five, six, seven or eight, etc.

[0365] In this embodiment, by providing a second protrusion 2612 on the third surface 261 of the first insulating member 26 where the second groove 2611 is provided, and the second protrusion 2612 having a structure that abuts against the main body 231 of the electrode assembly 23 in the thickness direction X of the wall portion, the first insulating member 26 and the main body 231 of the electrode assembly 23 can also play a role in mutual positioning and stabilization, thereby improving the stability of the first insulating member 26 between the main body 231 and the wall portion 22a, and improving the stability of the electrode assembly 23 within the outer casing 20a, which helps to reduce the risk of shaking or displacement of the first insulating member 26 and the electrode assembly 23 during use.

[0366] According to some embodiments of this application, refer to Figure 5 , 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 25 of the battery cell 20 provided in some embodiments of this application. An electrode lead-out hole 2215 is provided in the wall portion 22a, penetrating the wall portion 22a along the thickness direction X. The electrode lead-out member 25 may further include a lead-out portion 252 and a second connecting portion 253. Along the thickness direction X of the wall portion, the lead-out portion 252 is located on the side of the wall portion 22a opposite to the electrode assembly 23. The second connecting portion 253 passes through the electrode lead-out hole 2215 and connects the lead-out portion 252 and the first connecting portion 251. A through hole 2613 is provided on the bottom surface of the second groove 2611. Along the thickness direction X of the wall portion, the through hole 2613 corresponds to the electrode lead-out hole 2215, and the second connecting portion 253 passes through the through hole 2613.

[0367] Along the thickness direction X of the wall portion, the lead-out portion 252 is located on the side of the wall portion 22a opposite to the electrode assembly 23. That is, the lead-out portion 252 and the first connecting portion 251 of the electrode lead-out member 25 are located on opposite sides of the wall portion 22a, respectively. This results in the electrode lead-out member 25 having a first connecting portion 251 located inside the outer casing 20a and connected to the tab 232 of the electrode assembly 23, and the electrode lead-out member 25 having a lead-out portion 252 located outside the outer casing 20a 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 253 is a component in which the electrode lead-out member 25 is inserted into the electrode lead-out hole 2215 along the thickness direction X of the wall portion and connects the lead-out portion 252 and the first connecting portion 251.

[0368] The bottom surface of the second groove 2611 is provided with a through hole 2613, that is, the through hole 2613 provided on the first insulating member 26 is a structure that penetrates the bottom surface of the second groove 2611 along the thickness direction X of the wall portion, and the through hole 2613 penetrates the surface of the first protrusion 2621 away from the electrode assembly 23 along the thickness direction X of the wall portion.

[0369] Along the thickness direction X of the wall portion, the through hole 2613 and the electrode lead-out hole 2215 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 through hole 2613 and the area defined by the orthographic projection of the hole wall surface of the electrode lead-out hole 2215 overlap by at least a portion, thereby facilitating the second connecting portion 253 of the electrode lead-out member 25 to pass through the electrode lead-out hole 2215 and the through hole 2613 sequentially along the thickness direction X of the wall portion.

[0370] It should be noted that in the embodiment where the wall portion 22a is an end cap 22, the end cap 22 includes a body portion 221 and an edge portion 222, and the body portion 221 has a first surface 2211, the electrode lead-out hole 2215 is provided on the body portion 221.

[0371] It should be noted that in an embodiment where a limiting portion 263 is provided on the bottom surface of the second groove 2611 of the first insulating member 26, and the limiting portion 263 is configured to divide the second groove 2611 into a first groove 2611a located inside the limiting portion 263 and a second groove 2611b located outside the limiting portion 263, the through hole 2613 communicates with the first groove 2611a. Correspondingly, the projection of the hole wall surface of the through hole 2613 in the thickness direction X of the wall is located in the first groove 2611a.

[0372] In this embodiment, by providing an electrode lead-out hole 2215 on the wall portion 22a and providing a through hole 2613 corresponding to the electrode lead-out hole 2215 on the bottom surface of the second groove 2611 of the first insulating member 26, the second connecting portion 253 of the electrode lead-out member 25 can pass through the electrode lead-out hole 2215 and the through hole 2613 sequentially along the thickness direction X of the wall portion and connect the lead-out portion 252 and the first connecting portion 251. This enables the electrode lead-out member 25 to be electrically connected to the electrode assembly 23 and to input or output electrical energy of the battery cell 20 through the electrode lead-out member 25. The structure is simple and can reduce the assembly difficulty of the first insulating member 26 and the assembly difficulty between the electrode lead-out member 25 and the tab 232, which is beneficial to improving the assembly efficiency of the battery cell 20.

[0373] According to some embodiments of this application, see Figure 4 , Figure 8 and Figure 9 As shown, the wall portion 22a is provided with an electrode lead-out hole 2215, which penetrates the wall portion 22a along the thickness direction X. The battery cell 20 also includes an electrode lead-out member 25, at least a portion of which passes through the electrode lead-out hole 2215, and the electrode lead-out member 25 is electrically connected to the electrode assembly 23.

[0374] In this embodiment, by providing an electrode lead-out hole 2215 that penetrates the wall portion 22a along the thickness direction X of the wall portion, and at least a portion of the electrode lead-out member 25 is disposed within the electrode lead-out hole 2215, the electrode lead-out member 25 can be electrically connected to the electrode assembly 23, and the input or output of electrical energy of the battery cell 20 can be realized through the electrode lead-out member 25.

[0375] According to some embodiments of this application, see Figure 4 , Figure 8 , Figure 9 and Figure 12As shown, the electrode lead-out member 25 may include a lead-out portion 252, a first connecting portion 251, and a second connecting portion 253. The lead-out portion 252 is located on the side of the wall portion 22a opposite to the electrode assembly 23. At least a portion of the first connecting portion 251 is located on the side of the wall portion 22a facing the electrode assembly 23 and is electrically connected to the electrode assembly 23. The second connecting portion 253 passes through the electrode lead-out hole 2215 along the thickness direction X of the wall portion, and the second connecting portion 253 connects the lead-out portion 252 and the first connecting portion 251.

[0376] The second connecting part 253 is a component of the electrode lead-out member 25 that passes through the electrode lead-out hole 2215 and the through hole 2613 along the thickness direction X of the wall portion, and the second connecting part 253 serves to connect the lead-out part 252 and the first connecting part 251 located on both sides of the wall portion 22a.

[0377] In this embodiment, the electrode lead-out member 25 is provided with a lead-out portion 252 located on the side of the wall portion 22a away from the electrode assembly 23 and a first connecting portion 251 located at least partially on the side of the wall portion 22a facing the electrode assembly 23. The first connecting portion 251 is electrically connected to the electrode assembly 23. The electrode lead-out member 25 is also provided with a second connecting portion 253 passing through the electrode lead-out hole 2215. The second connecting portion 253 connects the lead-out portion 252 and the first connecting portion 251 to realize the input or output of electrical energy of the battery cell 20. The structure is simple and easy to assemble.

[0378] According to some embodiments of this application, see Figure 3 , Figure 4 , Figure 8 and Figure 9 As shown, the battery cell 20 may also include a second insulating member 27, at least a portion of which is disposed between the wall portion 22a and the lead-out portion 252.

[0379] The second insulating member 27 serves as both the insulating isolation wall 22a and the lead-out portion 252 of the electrode lead-out member 25. The material of the second insulating member 27 can be various, such as silicone, rubber, or plastic.

[0380] At least a portion of the second insulating member 27 is disposed between the wall portion 22a and the lead-out portion 252. That is, the second insulating member 27 can be a structure in which the entire portion is located between the wall portion 22a and the lead-out portion 252, or it can be a structure in which only a portion is located between the wall portion 22a and the lead-out portion 252. For example, in Figure 8 and Figure 9 In this configuration, only a portion of the second insulating member 27 is located between the wall portion 22a and the lead-out portion 252, and a portion of the second insulating member 27 surrounds the outer periphery of the lead-out portion 252.

[0381] In this embodiment, the battery cell 20 is further provided with a second insulating member 27, and at least a portion of the second insulating member 27 is disposed between the wall portion 22a and the lead portion 252, so that the second insulating member 27 can achieve insulation isolation between the wall portion 22a and the lead portion 252 of the electrode lead 25, thereby reducing the risk of short circuit between the wall portion 22a and the lead portion 252 during use, which is beneficial to improving the reliability of the battery cell 20.

[0382] According to some embodiments of this application, see Figure 4 , Figure 7 , Figure 8 and Figure 9 As shown, along the thickness direction X of the wall portion, the first surface 2211 faces the electrode assembly 23. The wall portion 22a also has a second surface 2213 facing away from the electrode assembly 23. The second surface 2213 is provided with a mounting groove 2217. The mounting groove 2217 and the first groove 2212 are correspondingly arranged along the thickness direction X of the wall portion, and the electrode lead-out hole 2215 connects the mounting groove 2217 and the first groove 2212. Along the thickness direction X of the wall portion, at least a portion of the second insulating member 27 is accommodated in the mounting groove 2217.

[0383] The second surface 2213 is the outer surface of the wall portion 22a that is away from the electrode assembly 23 in the thickness direction X of the wall portion. Correspondingly, the mounting groove 2217 is provided on the surface of the wall portion 22a that is away from the electrode assembly 23.

[0384] The assembly groove 2217 and the first groove 2212 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 2217 and the orthographic projection of the bottom surface of the first groove 2212 overlap.

[0385] The electrode lead-out hole 2215 connects the assembly groove 2217 and the first groove 2212. That is, the electrode lead-out hole 2215 has a structure in which both ends in the thickness direction X of the wall penetrate the bottom surface of the assembly groove 2217 and the bottom surface of the first groove 2212, respectively.

[0386] Along the thickness direction X of the wall portion, at least a portion of the second insulating member 27 is accommodated within the mounting groove 2217. That is, the second insulating member 27 can be a structure entirely accommodated within the mounting groove 2217, or a structure only partially accommodated within the mounting groove 2217. For example, in... Figure 9 In this process, only a portion of the second insulating element 27 is accommodated within the assembly groove 2217.

[0387] In this embodiment, by providing an assembly groove 2217 on the second surface 2213 of the wall portion 22a, and at least a portion of the second insulating member 27 being accommodated in the assembly groove 2217 along the thickness direction X of the wall portion, the battery cell 20 with this structure can, on the one hand, limit and position the second insulating member 27 through the assembly groove 2217, which helps to reduce the difficulty of assembling the second insulating member 27 between the wall portion 22a and the lead-out portion 252, and can reduce the phenomenon of shaking or displacement of the second insulating member 27 during use, which helps to improve the assembly stability of the second insulating member 27. On the other hand, it can realize that the second insulating member 27 and the wall portion 22a 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.

[0388] In some embodiments, see Figure 5 , Figure 6 and Figure 7 As shown, the second reinforcing part 242 of the reinforcing member 24 includes a main body region 2421, which protrudes from the bottom surface of the first groove 2212. The main body region 2421 has a fifth surface 2421a facing the electrode assembly 23 in the thickness direction X of the wall portion. Along the thickness direction X of the wall portion, the bottom surface of the first groove 2212 forms the main body region 2421 at the position corresponding to the mounting groove 2217, and the two ends of the electrode lead-out hole 2215 respectively penetrate the fifth surface 2421a and the bottom surface of the mounting groove 2217.

[0389] Along the thickness direction X of the wall, the bottom surface of the first groove 2212 forms a main body area 2421 corresponding to the position of the mounting groove 2217. That is, the main body area 2421 of the second reinforcing part 242 of the reinforcing member 24 is provided corresponding to the mounting groove 2217 in the thickness direction X of the wall, such that in the projection plane perpendicular to the thickness direction X of the wall, at least part of the orthographic projection of the main body area 2421 and the orthographic projection of the bottom surface of the mounting groove 2217 overlap.

[0390] For example, in the embodiment of this application, in the projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the bottom surface of the mounting groove 2217 is entirely located in the orthographic projection of the main body area 2421.

[0391] The two ends of the electrode lead-out hole 2215 penetrate the fifth surface 2421a and the bottom surface of the mounting groove 2217, respectively. That is, the electrode lead-out hole 2215 penetrates both the bottom wall of the mounting groove 2217 and the main body area 2421 of the second reinforcing part 242 of the reinforcing member 24 along the thickness direction X of the wall portion. The fifth surface 2421a is the surface of the main body area 2421 of the second reinforcing part 242 of the reinforcing member 24 facing the electrode assembly 23.

[0392] In this embodiment, a main body area 2421 of the reinforcing member 24 is formed by protruding from the bottom surface of the first groove 2212 at a position corresponding to the mounting groove 2217. This allows the reinforcing member 24 to not only strengthen the structural strength of the wall portion 22a, but also to improve the structural strength of the portion of the wall portion 22a located between the bottom surface of the mounting groove 2217 and the bottom surface of the first groove 2212. This helps to alleviate deformation or cracking in the area of ​​the wall portion 22a used for assembling the electrode lead-out member 25, thereby improving the reliability of the battery cell 20.

[0393] According to some embodiments of this application, see Figure 7 As shown, along the thickness direction X of the wall, the minimum distance between the fifth surface 2421a and the bottom surface of the assembly groove 2217 is L2, which satisfies 0.5mm≤L2≤3mm.

[0394] For example, the minimum distance L2 between the bottom surface of the mounting groove 2217 and the fifth surface 2421a 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.

[0395] In this embodiment, by setting the minimum distance between the bottom surface of the assembly groove 2217 and the fifth surface 2421a of the main body region 2421 to 0.5mm to 3mm, on the one hand, the structural strength of the area of ​​the wall portion 22a where the assembly groove 2217 is set can be improved, which helps to alleviate the deformation or cracking of the area of ​​the wall portion 22a used for assembling the electrode lead 25, 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 2217 and the fifth surface 2421a of the main body region 2421 for setting the electrode lead hole 2215 in the thickness direction X of the wall portion can be saved, thereby optimizing the length dimension of the second connecting part 253 of the electrode lead 25 in the thickness direction X of the wall portion, so that the second connecting part 253 can be inserted into the electrode lead hole 2215, and the manufacturing cost of the second connecting part 253 can be reduced.

[0396] According to some embodiments of this application, see Figure 8 , Figure 9 and Figure 12 As shown, the second connecting part 253 is riveted to the lead-out part 252.

[0397] For example, the lead-out portion 252 is provided with a riveting hole 2521, which penetrates the surfaces of both sides of the lead-out portion 252 along the thickness direction X of the wall portion. Correspondingly, the second connecting portion 253 is inserted into the riveting hole 2521 and riveted to the lead-out portion 252.

[0398] It should be noted that in other embodiments, the lead-out portion 252 and the second connecting portion 253 may also be connected to each other by welding or snap-fitting structures.

[0399] In this embodiment, by setting the second connecting part 253 and the lead-out part 252 as a riveted structure, it is beneficial to improve the connection stability between the second connecting part 253 and the lead-out part 252, thereby reducing the risk of connection failure of the electrode lead-out part 25 during use, and also reducing the connection difficulty between the second connecting part 253 and the lead-out part 252, thereby improving the assembly efficiency of the battery cell 20.

[0400] According to some embodiments of this application, please refer to Figure 8 , Figure 9 and Figure 12 As shown, the first connecting portion 251 and the second connecting portion 253 are integrally formed. That is, the first connecting portion 251 and the second connecting portion 253 of the electrode lead-out member 25 are structures manufactured by an integral forming process, such as casting, stamping or milling.

[0401] In this embodiment, by setting the first connecting part 251 and the second connecting part 253 as an integrally formed structure, on the one hand, the connection stability between the first connecting part 251 and the second connecting part 253 can be improved, thereby reducing the risk of connection failure of the electrode lead 25 during use. On the other hand, the assembly and connection process of the first connecting part 251 and the second connecting part 253 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.

[0402] In some embodiments, please continue to see Figure 8 , Figure 9 and Figure 12 As shown, along the thickness direction X of the wall portion, the second connecting portion 253 protrudes from the surface of the first connecting portion 251 facing the wall portion 22a. That is, the second connecting portion 253 and the first connecting portion 251 are arranged along the thickness direction X of the wall portion, and the end of the second connecting portion 253 near the first connecting portion 251 is connected to the surface of the first connecting portion 251 facing the wall portion 22a.

[0403] For example, in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the second connecting portion 253 is located within the orthographic projection of the first connecting portion 251.

[0404] In this embodiment, by setting the second connecting part 253 as a structure that protrudes from the surface of the first connecting part 251 facing the wall part 22a, on the one hand, the assembly difficulty of the second connecting part 253 passing through the electrode lead-out hole 2215 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 251 and the second connecting part 253 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.

[0405] 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 251 and the second connecting part 253 being separately arranged. That is, the first connecting part 251 and the second connecting part 253 of the electrode lead-out member 25 are two independent components, and the first connecting part 251 and the second connecting part 253 are connected to each other. For example, the first connecting part 251 can be an adapter piece or a current collector component disposed between the second connecting part 253 and the tab 232.

[0406] In this embodiment, by setting the first connecting part 251 and the second connecting part 253 as separate structures, it is beneficial to improve the assembly flexibility of the electrode lead 25, so that the positions of the first connecting part 251 and the second connecting part 253 can be adjusted according to the actual assembly situation to meet the assembly application scenarios of different battery cells 20.

[0407] In embodiments where the first connecting portion 251 and the second connecting portion 253 are separately configured, the first connecting portion 251 and the second connecting portion 253 are welded together. Of course, in other embodiments, the first connecting portion 251 and the second connecting portion 253 may also be abutting or snap-fitted together.

[0408] In this embodiment, by setting the first connecting part 251 and the second connecting part 253 to be welded together, the connection stability between the first connecting part 251 and the second connecting part 253 can be improved, thereby reducing the risk of connection failure of the electrode lead 25 during use.

[0409] According to some embodiments of this application, see Figure 4 , Figure 8 and Figure 9 As shown, the battery cell 20 may also include a seal 28, which is disposed between the second connection portion 253 and the wall portion 22a. The seal 28 is configured to seal the gap between the second connection portion 253 and the wall surface of the electrode lead-out hole 2215.

[0410] The sealing element 28 serves to seal the gap between the second connecting part 253 and the hole wall of the electrode lead-out hole 2215. The sealing element 28 can be made of various materials, such as rubber, plastic or silicone.

[0411] For example, in Figure 9 In this process, the sealing member 28 is sleeved on the outside of the second connecting part 253, and a portion of the sealing member 28 is located inside the electrode lead-out hole 2215, such that a portion of the sealing member 28 is located between the second connecting part 253 and the hole wall surface of the electrode lead-out hole 2215.

[0412] In this embodiment, the battery cell 20 is also provided with a sealing member 28. By placing the sealing member 28 between the wall portion 22a and the second connecting portion 253 of the electrode lead-out member 25, the sealing member 28 can seal the gap between the second connecting portion 253 of the electrode lead-out member 25 and the hole wall surface of the electrode lead-out hole 2215, thereby reducing the risk of leakage of the battery cell 20 at the electrode lead-out hole 2215, which is beneficial to improving the stability and reliability of the battery cell 20 in use.

[0413] According to some embodiments of this application, the outer casing 20a is made of metal.

[0414] For example, the material of the outer casing 20a may be copper, iron, aluminum, steel or aluminum alloy, etc.

[0415] In this embodiment, by setting the outer shell 20a to a metal structure, it is easier to form the outer shell 20a and reduce the manufacturing difficulty of the outer shell 20a. On the other hand, it can enhance the overall structural strength of the outer shell 20a, so as to alleviate the phenomenon of fatigue cracking or deformation and collapse when the outer shell 20a 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.

[0416] 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.

[0417] 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.

[0418] 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.

[0419] 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.

[0420] 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.

[0421] 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.

[0422] 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.

[0423] 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.

[0424] 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, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0425] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0426] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0427] 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, including the walls; and Electrode assembly, housed within the housing; Along the thickness direction of the wall portion, one side of the wall portion has a first surface, the first surface is provided with a first groove, the bottom surface of the first groove is provided with a reinforcing member, the reinforcing member is connected to the side surface of the first groove, and the wall portion and the reinforcing member are integrally formed.

2. The battery cell according to claim 1, characterized in that, The reinforcement is configured to divide the first groove into a plurality of sub-grooves.

3. The battery cell according to claim 1, characterized in that, The reinforcing member includes a plurality of first reinforcing parts arranged at intervals along a first direction. The first reinforcing parts protrude from the bottom surface of the first groove. The groove side of the first groove includes a first side and a second side arranged opposite to each other in a second direction. The thickness direction of the wall portion, the first direction, and the second direction are perpendicular to each other. The first reinforcing part extends along the second direction, and the two ends of the first reinforcing part in the second direction are respectively connected to the first side and the second side.

4. The battery cell according to claim 3, characterized in that, Along the first direction, the width of the first reinforcing part is W1, which satisfies 0.5mm≤W1≤3mm.

5. The battery cell according to claim 3, characterized in that, The reinforcing member further includes a second reinforcing part, which protrudes from the bottom surface of the first groove; Along the first direction, a second reinforcing part is provided between every two adjacent first reinforcing parts, and the second reinforcing part connects the two adjacent first reinforcing parts.

6. The battery cell according to claim 5, characterized in that, The second reinforcing part connects the first side and the second side.

7. The battery cell according to claim 6, characterized in that, The second reinforcing part includes a main body area and a plurality of connecting ribs, wherein the plurality of connecting ribs are arranged at intervals along the circumference of the main body area; The first side and the second side are both connected to the main body area by at least one connecting rib, and two adjacent first reinforcing parts are both connected to the main body area by at least one connecting rib.

8. The battery cell according to claim 7, characterized in that, At least one of the main body regions of the second reinforcing portion is provided with an electrode lead-out hole, and the battery cell further includes an electrode lead-out member. Along the thickness direction of the wall portion, at least a portion of the electrode lead-out member passes through the electrode lead-out hole, and the electrode lead-out member is electrically connected to the electrode assembly.

9. The battery cell according to claim 7, characterized in that, At least one of the main body areas of the second reinforcing part is provided with a liquid injection hole.

10. The battery cell according to claim 9, characterized in that, There are multiple second reinforcing parts, and the main body area of ​​each of the two second reinforcing parts is provided with an electrode lead-out hole. The battery cell also includes two electrode leads with opposite polarities. Along the thickness direction of the wall, at least a portion of each electrode lead-out is inserted into one of the electrode lead-out holes, and both electrode leads are electrically connected to the electrode assembly. In this configuration, along the first direction, the second reinforcing portion having the injection hole is located between the two second reinforcing portions having the electrode lead-out hole.

11. The battery cell according to claim 7, characterized in that, The width of the connecting rib is W2, which satisfies the condition 0.5mm≤W2≤3mm.

12. The battery cell according to claim 3, 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 first reinforcing parts are located between the third side and the fourth side in the first direction; The reinforcing member further includes a plurality of third reinforcing parts, each of which protrudes from the bottom surface of the first groove and extends along the first direction. Along the first direction, the first reinforcing part closest to the third side is connected to the third side through at least one of the third reinforcing parts, and the first reinforcing part closest to the fourth side is connected to the fourth side through at least one of the third reinforcing parts.

13. The battery cell according to claim 12, characterized in that, Along the second direction, the width of the third reinforcing part is W3, which satisfies 0.5mm≤W3≤3mm.

14. The battery cell according to claim 3, 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.

15. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, the side of the wall portion opposite to the first surface also has a second surface, the distance between the second surface and the first surface is D, and the groove depth of the first groove is H, satisfying 0.05≤H / D≤0.

875.

16. The battery cell according to claim 15, characterized in that, 1mm≤D≤4mm.

17. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, the reinforcing member does not extend beyond the first surface.

18. The battery cell according to claim 17, characterized in that, Along the thickness direction of the wall portion, the groove depth of the first groove is H, and the thickness of the reinforcing member protruding from the bottom surface of the first groove is T, satisfying that T≥0.15H.

19. The battery cell according to claim 1, characterized in that, The housing includes a shell and an end cap. The shell has an internal cavity, and the shell has an opening at one end in the thickness direction of the wall portion. The opening communicates with the cavity. At least a portion of the electrode assembly is accommodated in the cavity. At least a portion of the end cap is inserted into the cavity through the opening. The end cap has a first outer peripheral surface that abuts against the inner peripheral surface of the shell, and the end cap is welded to the shell. The wall portion is the end cap, and the minimum distance between the side surface of the first groove and the first outer peripheral surface is L1, which satisfies 1mm≤L1≤5mm.

20. The battery cell according to claim 19, characterized in that, 1.5mm≤L1≤4mm.

21. The battery cell according to claim 19, characterized in that, The end cap includes: The body portion, along the thickness direction of the wall portion, is partially inserted into the receiving cavity through the opening, the body portion having the first outer peripheral surface, and the body portion having the first surface; An edge portion protrudes from the first outer peripheral surface, and the edge portion abuts against the end of the housing where the opening is provided along the thickness direction of the wall portion.

22. The battery cell according to claim 21, characterized in that, The edge portion is a ring structure surrounding the body portion.

23. The battery cell according to claim 1, characterized in that, The Vickers hardness of the area of ​​the wall portion on the first surface where the first groove is not provided is HV1, and the Vickers hardness of the area of ​​the wall portion on the first surface where the first groove is provided is HV2, satisfying 1≤HV2-HV1≤10.

24. The battery cell according to any one of claims 1-23, characterized in that, Along the thickness direction of the wall portion, the first surface faces the electrode assembly.

25. The battery cell according to claim 24, characterized in that, The electrode assembly includes a main body and an electrode tab, wherein the electrode tab is connected to one end of the main body facing the wall in the thickness direction of the wall; The battery cell further includes an electrode lead-out member and a first insulating member. The electrode lead-out member is disposed on the wall portion and includes a first connecting portion connected to the electrode tab. The first insulating member 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.

26. The battery cell according to claim 25, 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.

27. The battery cell according to claim 26, characterized in that, The limiting part is a ring structure that extends circumferentially along the first connecting part.

28. The battery cell according to claim 27, 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.

29. The battery cell according to claim 25, 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.

30. The battery cell according to claim 29, 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.

31. The battery cell according to claim 29, characterized in that, The battery cell includes two electrode leads, which are spaced apart on the wall portion along a first direction; 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.

32. The battery cell according to claim 25, characterized in that, Along the thickness direction of the wall portion, the first protrusion abuts against the reinforcing member.

33. The battery cell according to claim 25, 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.

34. The battery cell according to claim 25, characterized in that, The wall portion is provided with an electrode lead-out hole, which penetrates the wall portion along the thickness direction. The electrode lead-out member also 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 is inserted into 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 through hole, and the through hole is provided corresponding to the electrode lead-out hole along the thickness direction of the wall, and the second connecting part passes through the through hole.

35. The battery cell according to any one of claims 1-23, characterized in that, The wall portion is provided with an electrode lead-out hole, which penetrates the wall portion along its thickness direction. The battery cell further includes an electrode lead, at least a portion of which passes through the electrode lead hole and is electrically connected to the electrode assembly.

36. The battery cell according to claim 35, characterized in that, The electrode lead-out component includes: The lead-out portion is located on the side of the wall portion opposite to the electrode assembly; A first connecting portion is at least partially located on the side of the wall facing the electrode assembly and is electrically connected 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.

37. The battery cell according to claim 36, 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.

38. The battery cell according to claim 37, characterized in that, Along the thickness direction of the wall portion, the first surface faces the electrode assembly, and the wall portion also has a second surface facing away from the electrode assembly. The second surface is provided with an assembly groove, and the assembly groove and the first groove are correspondingly provided along the thickness direction of the wall portion. The electrode lead-out hole communicates with the assembly groove and the first groove. Wherein, at least a portion of the second insulating member is accommodated within the assembly groove along the thickness direction of the wall portion.

39. The battery cell according to claim 38, characterized in that, The reinforcing member includes a main body area, which protrudes from the bottom surface of the first groove, and the main body area has a fifth surface facing the electrode assembly in the thickness direction of the wall portion; Along the thickness direction of the wall portion, the bottom surface of the first groove corresponds to the position of the assembly groove to form the main body area, and the two ends of the electrode lead-out hole respectively penetrate the fifth surface and the bottom surface of the assembly groove.

40. The battery cell according to claim 39, characterized in that, Along the thickness direction of the wall portion, the minimum distance between the fifth surface and the bottom surface of the assembly groove is L2, which satisfies 0.5mm≤L2≤3mm.

41. The battery cell according to claim 36, characterized in that, The second connecting part is riveted to the lead-out part.

42. The battery cell according to claim 36, characterized in that, The first connecting part and the second connecting part are integrally formed.

43. The battery cell according to claim 42, 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.

44. The battery cell according to claim 36, characterized in that, The first connecting part and the second connecting part are separately provided.

45. The battery cell according to claim 44, characterized in that, The first connecting part and the second connecting part are welded together.

46. ​​The battery cell according to claim 36, characterized in that, The battery cell also includes: A seal is disposed between the second connecting portion and the wall portion, the seal being configured to seal the gap between the second connecting portion and the wall surface of the electrode lead-out hole.

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

48. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-47.

49. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-47, the battery cell being used to provide electrical energy.

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