Battery cell, battery, and electric device

Abstract

The present application provides a battery cell, a battery, and an electric device, and belong to the technical field of batteries. The battery cell comprises a housing, an electrode assembly, and electrode terminal. The housing is provided with a wall portion, and an installation hole is formed on the wall portion. The electrode assembly is accommodated within the housing. The electrode terminal is arranged as passing through the installation hole; the electrode terminal comprises a first terminal portion and a second terminal portion in a split arrangement; the first terminal portion and the second terminal portion are arranged in the thickness direction of the wall portion and are interconnected; at least part of the first terminal portion is located on the side of the wall portion facing the electrode assembly and is electrically connected to the electrode assembly; at least part of the second terminal portion is located on the side of the wall portion away from the electrode assembly, and the first terminal portion and the second terminal portion are configured as cooperatively holding the wall portion. The present battery cell does not need a riveting process to assemble a terminal onto the wall portion, and the sizes of the first terminal portion and the second terminal portion can be increased according to practical requirements, so as to improve the stability the electrode terminal assembled onto the wall portion.

Description

Battery cells, batteries and electrical devices Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. As the core components of new energy vehicles, batteries have high requirements in terms of safety in use and service life. The battery cell of a battery usually includes a shell and an electrode assembly housed in the shell, and the shell is provided with electrode terminals. By electrically connecting the electrode terminals to the electrode assembly, the input or output of electrical energy of the battery cell can be realized. However, the structural stability of the electrode terminals of existing battery cells installed on the shell is poor, which makes the electrode terminals prone to falling off during use, resulting in poor stability in the use of the battery cell and a short service life.

[0003] Summary of the Invention

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the stability and service life of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell comprising a shell, an electrode assembly and an electrode terminal; the shell has a wall portion, the wall portion is provided with a mounting hole, and the mounting hole passes through the wall portion along the thickness direction of the wall portion; the electrode assembly is accommodated in the shell; the electrode terminal is passed through the mounting hole, and the electrode terminal comprises a first terminal portion and a second terminal portion which are separately provided, the first terminal portion and the second terminal portion are arranged and connected along the thickness direction of the wall portion, at least a portion of the first terminal portion is located on a side of the wall portion facing the electrode assembly, and is electrically connected to the electrode assembly, and at least a portion of the second terminal portion is located on a side of the wall portion away from the electrode assembly, and the first terminal portion and the second terminal portion are configured to cooperate and clamp the wall portion.

[0006] In the above technical solution, the electrode terminal is provided with a first terminal portion and a second terminal portion which are arranged and connected along the thickness direction of the wall portion, and at least a portion of the first terminal portion is located on the side of the wall portion facing the electrode assembly, and at least a portion of the second terminal portion is located on the side of the wall portion away from the electrode assembly, so that the first terminal portion and the second terminal portion can cooperate to clamp the wall portion, thereby realizing the electrode terminal being assembled to the wall portion to limit the electrode terminal from being separated from the wall portion along the thickness direction of the wall portion. The battery cell adopting this structure does not need to assemble the electrode terminal on the wall portion through a riveting process, and can increase the radial dimensions of the separately arranged first terminal portion and the second terminal portion according to actual needs, which is conducive to improving the structural strength of the first terminal portion and the second terminal portion, thereby effectively improving the structural strength and structural stability of the electrode terminal assembled on the wall portion, so as to reduce the risk of the electrode terminal falling off during use, and thus is conducive to improving the use stability and service life of the battery cell.

[0007] In some embodiments, the first terminal portion includes a first limiting portion and a first protrusion; along the thickness direction of the wall portion, the first limiting portion is located on the side of the wall portion facing the electrode assembly, and the first limiting portion is configured to cooperate with the second terminal portion to clamp the wall portion; the first protrusion is protruded on the side of the first limiting portion away from the electrode assembly, and the first protrusion is passed through the mounting hole along the thickness direction of the wall portion and connected to the second terminal portion.

[0008] In the above technical solution, the first terminal portion is provided with a first limiting portion and a first protrusion, and the first limiting portion is located on the side of the wall portion facing the electrode assembly, so that the first limiting portion can cooperate with the second terminal portion to clamp the wall portion, and the first protrusion is protruded on the side of the first limiting portion away from the electrode assembly, and is passed through the mounting hole, so that the first terminal portion can be connected to the second terminal portion through the first protrusion passed through the mounting hole, so as to realize that the first terminal portion and the second terminal portion are arranged and connected along the thickness direction of the wall portion, which is conducive to reducing the difficulty of connecting the first terminal portion and the second terminal portion.

[0009] In some embodiments, the second terminal portion includes a second limiting portion and a second protrusion; along the thickness direction of the wall portion, the second limiting portion is located on the side of the wall portion away from the electrode assembly, at least part of the wall portion is located between the second limiting portion and the first limiting portion, and the second limiting portion is configured to cooperate with the first limiting portion to clamp the wall portion; the second protrusion is protruding from the side of the second limiting portion facing the electrode assembly, and the second protrusion is connected to the first protrusion.

[0010] In the above technical solution, the second terminal portion is provided with a second limiting portion and a second protrusion, and the second limiting portion is located on the side of the wall portion away from the electrode assembly, so that the second limiting portion can cooperate with the first limiting portion to clamp the wall portion, and the second protrusion is protruding on the side of the second limiting portion facing the electrode assembly, thereby facilitating the mutual connection between the first terminal portion and the second terminal portion through the structure in which the first protrusion and the second protrusion are interconnected. The structure is simple, easy to assemble, and conducive to optimizing the size of the first protrusion protruding from the first limiting portion, so as to reduce the processing difficulty of the first terminal portion.

[0011] In some embodiments, along the thickness direction of the wall portion, a first groove is formed on a side of the first terminal portion facing the electrode assembly and corresponding to a position of the first protrusion.

[0012] In the above technical solution, by forming a first groove on the side of the first terminal portion facing the electrode assembly and in an area corresponding to the first protrusion, the first terminal portion is formed by stamping, thereby forming the first protrusion and the first groove on both sides of the first terminal portion, which helps to reduce the difficulty of manufacturing the first terminal portion. In addition, by providing the first groove on the first terminal portion, the thickness of the area of ​​the first terminal portion provided with the first protrusion can be reduced, thereby reducing the difficulty of assembling and connecting the first protrusion to the second terminal portion.

[0013] In some embodiments, the first protrusion is welded to the second terminal portion to form a first weld mark, and at least a portion of the first weld mark is formed on the bottom surface of the first groove.

[0014] In the above technical solution, the first protrusion and the second terminal portion are arranged to be welded to each other, and at least a portion of the first weld mark formed by the mutual welding between the first protrusion and the second terminal portion is formed on the bottom surface of the first groove, so that the first weld mark is a structure extending into the first groove. The battery cell adopting this structure can be welded and assembled to the first protrusion and the second terminal portion from the side where the first groove is provided on the first terminal portion, so that the first terminal portion and the second terminal portion are welded to each other from the side where the first groove is formed in the thinned area of ​​the first terminal portion, thereby reducing the difficulty of welding the first terminal portion and the second terminal portion to each other and the power required for the welding connection.

[0015] In some embodiments, the battery cell further includes a current collecting member; the current collecting member is disposed between the wall portion and the electrode assembly, the current collecting member connects the first terminal portion and the electrode assembly to electrically connect the first terminal portion and the electrode assembly; wherein the current collecting member is spaced apart from the first weld mark.

[0016] In the above technical solution, the battery cell is further provided with a current collecting member, which connects the first terminal portion and the electrode assembly via the current collecting member to achieve electrical connection between the electrode assembly and the electrode terminal, thereby reducing the difficulty of connecting the electrode assembly to the first terminal portion. Furthermore, by spacing the current collecting member from the first weld mark, the current collecting member and the first weld mark do not contact each other in the thickness direction of the wall portion, thereby reducing the interference effect of the first weld mark on the current collecting member and improving the connection quality between the current collecting member and the first terminal portion.

[0017] In some embodiments, along the thickness direction of the wall portion, the first limiting portion has a first surface facing the electrode assembly, the first groove is recessed from the first surface toward a direction away from the electrode assembly, and the first surface is connected to the current collecting member.

[0018] In the above technical solution, the first groove is recessed from the first surface of the first limiting portion in a direction away from the electrode assembly, so that the current collecting member is connected to the first surface of the first limiting portion where the first groove is provided, so that the first weld mark formed on the bottom surface of the first groove can be spaced apart from the current collecting member in the thickness direction of the wall portion through the first groove, thereby realizing the spacing between the current collecting member and the first weld mark, so that the current collecting member can not contact the first weld mark in the thickness direction of the wall portion, the structure is simple, and the difficulty of connecting the current collecting member and the first terminal portion can be reduced.

[0019] In some embodiments, along the thickness direction of the wall portion, a first protrusion is provided on the side of the current collecting member facing away from the electrode assembly, and the first protrusion extends into the first groove and is connected to the bottom surface of the first groove; wherein, the end of the first protrusion facing the bottom surface of the first groove is provided with a first avoidance groove for avoiding the first weld mark.

[0020] In the above technical solution, a first protrusion is provided on the side of the current collecting member facing away from the electrode assembly, allowing the first protrusion to be inserted into the first groove of the first terminal portion and connected to the bottom surface of the first groove. This structure of the current collecting member allows the first protrusion to provide a certain positioning function, thereby improving the assembly accuracy between the current collecting member and the first terminal portion. Furthermore, the interconnection between the first protrusion and the bottom surface of the first groove can reduce the impact of the connection between the current collecting member and the first terminal portion on other components. Furthermore, a first avoidance groove is provided at one end of the first protrusion facing the bottom surface of the first groove, for avoiding the first weld mark. This allows the first weld mark formed on the bottom surface of the first groove to be spaced apart from the current collecting member in the thickness direction of the wall portion through the first avoidance groove, thereby achieving a spacing between the current collecting member and the first weld mark, so that the current collecting member and the first weld mark do not contact each other in the thickness direction of the wall portion.

[0021] In some embodiments, along the thickness direction of the wall portion, the groove depth of the first avoidance groove is H1, which satisfies 0.1 mm ≤ H1 ≤ 0.5 mm.

[0022] In the above technical solution, the groove depth of the first avoidance groove in the thickness direction of the wall is set to be greater than or equal to 0.1 mm, so as to improve the avoidance effect of the first avoidance groove on the first weld mark, thereby alleviating the interference effect of the first weld mark on the mutual connection between the first convex portion and the groove bottom surface of the first groove of the current collecting component, which is beneficial to improving the quality of the mutual connection between the first convex portion and the groove bottom surface of the first groove. By setting the groove depth of the first avoidance groove in the thickness direction of the wall to be less than or equal to 0.5 mm, the phenomenon of excessive waste of the first avoidance groove is reduced. On the one hand, the structural strength of the first convex portion can be improved to improve the connection stability between the first convex portion and the groove bottom surface of the first groove. On the other hand, the processing difficulty of the first avoidance groove can be reduced to improve the processing efficiency of the current collecting component.

[0023] In some embodiments, along the thickness direction of the wall portion, a first protrusion is provided on the side of the current collecting component facing away from the electrode assembly, and the first protrusion extends into the first groove and is connected to the bottom surface of the first groove; wherein the first weld mark surrounds the outer side of the first protrusion.

[0024] In the above technical solution, a first protrusion is provided on the side of the current collecting member facing away from the electrode assembly, allowing the first protrusion to be inserted into the first groove of the first terminal portion and connected to the bottom surface of the first groove. This structure of the current collecting member allows the first protrusion to provide a certain positioning effect, thereby improving the assembly accuracy between the current collecting member and the first terminal portion. Furthermore, the interconnection between the first protrusion and the bottom surface of the first groove reduces the impact of the connection between the current collecting member and the first terminal portion on other components. Furthermore, by configuring the first weld mark to surround the outside of the first protrusion, the first weld mark formed on the bottom surface of the first groove can be spaced apart from the current collecting member, thereby ensuring that the current collecting member and the first weld mark do not contact each other in the thickness direction of the wall.

[0025] In some embodiments, along the thickness direction of the wall portion, a second groove is formed on a side of the current collecting member facing the electrode assembly and corresponding to a position of the first protrusion.

[0026] In the above technical solution, a second groove is formed on the side of the current collecting component facing the electrode assembly and in the area corresponding to the first convex portion, so that the current collecting component is a structure that can be formed by stamping, so that the first convex portion and the second groove are respectively formed on both sides of the current collecting component, which is conducive to reducing the manufacturing difficulty of the current collecting component.

[0027] In some embodiments, the second terminal portion includes a second limiting portion and a second protrusion; along the thickness direction of the wall portion, the second limiting portion is located on the side of the wall portion away from the electrode assembly, and the second limiting portion is configured to cooperate with the first terminal portion to clamp the wall portion; the second protrusion is protruded on the side of the second limiting portion facing the electrode assembly, and the second protrusion is passed through the mounting hole along the thickness direction of the wall portion and connected to the first terminal portion.

[0028] In the above technical solution, the second terminal portion is provided with a second limiting portion and a second protrusion, and the second limiting portion is located on the side of the wall portion facing away from the electrode assembly, so that the second limiting portion can cooperate with the first terminal portion to clamp the wall portion, and the second protrusion is protruded on the side of the second limiting portion facing the electrode assembly, and is passed through the mounting hole, so that the second terminal portion can be connected to the first terminal portion through the second protrusion passed through the mounting hole, so as to realize that the first terminal portion and the second terminal portion are arranged and connected along the thickness direction of the wall portion, which is conducive to reducing the difficulty of connecting the first terminal portion and the second terminal portion.

[0029] In some embodiments, along the thickness direction of the wall portion, the first terminal portion is entirely located on a side of the wall portion facing the electrode assembly.

[0030] In the above technical solution, by setting the first terminal part as a structure that is located as a whole on the side of the wall part facing the electrode assembly, the first terminal part is easily assembled, and there is no need to set a protruding structure inserted into the mounting hole on the first terminal part, which is beneficial to reducing the processing difficulty of the first terminal part.

[0031] In some embodiments, along a thickness direction of the wall portion, the first terminal portion has a second surface facing away from the electrode assembly, and the second surface is connected to the second protrusion.

[0032] In the above technical solution, by connecting the second surface of the first terminal part facing away from the electrode assembly with the second protrusion, the second protrusion is made to be a structure that is interconnected with the surface of the first terminal part facing away from the electrode assembly. The structure is simple and easy to assemble, and there is no need to provide a protrusion structure on the first terminal part to be inserted into the mounting hole, which is beneficial to reducing the processing difficulty of the first terminal part.

[0033] In some embodiments, the second surface is a continuously arranged plane and is perpendicular to the thickness direction of the wall portion.

[0034] In the above technical solution, by setting the second surface as a planar structure that is perpendicular to the thickness direction of the wall portion and continuously arranged, the second protrusion of the second terminal portion is facilitated to be connected to the first terminal portion, and it is beneficial to improve the connection quality between the second terminal portion and the first terminal portion.

[0035] In some embodiments, the electrode assembly has a tab, and along the thickness direction of the wall portion, the tab is connected to a side of the first terminal portion facing the electrode assembly to electrically connect the electrode assembly and the first terminal portion.

[0036] In the above technical solution, since the second surface of the first terminal portion facing away from the electrode assembly is a plane, the first terminal portion can be set as a plate-like structure, so that the electrode tab of the electrode assembly can be directly connected to the side of the first terminal portion facing the electrode assembly, without the need to set a current collecting component, which is conducive to optimizing the production process and production rhythm of the battery cell, thereby improving the production efficiency of the battery cell and reducing the production cost of the battery cell.

[0037] In some embodiments, along the thickness direction of the wall portion, the first terminal portion has a third surface facing the electrode assembly, and the third surface is provided with a third groove; wherein the second protrusion is welded to the second surface and forms a first weld mark, and at least a portion of the first weld mark is formed on the bottom surface of the third groove.

[0038] In the above technical solution, a third groove is provided on the third surface of the first terminal part facing the electrode assembly, and at least a portion of the first weld mark formed by the second protrusion and the second surface being welded to each other is formed on the bottom surface of the third groove, so that the first weld mark is a structure extending into the third groove. The battery cell adopting this structure can be welded and assembled to the second protrusion and the second surface of the first terminal part from the side where the third groove is provided on the first terminal part, so that the first terminal part and the second terminal part are welded to each other from the side where the third groove is formed on the first terminal part, and there is no need to penetrate the second limiting part and the second protrusion from the side of the second terminal part away from the electrode assembly and then weld to the first terminal part, which is beneficial to reducing the difficulty of welding the first terminal part and the second terminal part to each other and the power required for the welding connection.

[0039] In some embodiments, the battery cell further includes a current collecting member; the current collecting member is disposed between the wall portion and the electrode assembly, and the current collecting member connects the first terminal portion and the electrode assembly to electrically connect the first terminal portion and the electrode assembly; wherein, along the thickness direction of the wall portion, the current collecting member is connected to the third surface, and the current collecting member is spaced apart from the bottom surface of the third groove.

[0040] In the above technical solution, the battery cell is further provided with a current collecting member, which connects the first terminal portion and the electrode assembly via the current collecting member to achieve electrical connection between the electrode assembly and the electrode terminal, thereby reducing the difficulty of connecting the electrode assembly to the first terminal portion. Furthermore, by connecting the current collecting member to the third surface of the first terminal, where the third groove is provided, the first weld mark formed on the bottom surface of the third groove can be spaced apart from the current collecting member in the thickness direction of the wall portion via the third groove. The third groove also serves to avoid the first weld mark for the current collecting member, thereby achieving a spacing between the current collecting member and the first weld mark in the thickness direction of the wall portion, preventing the current collecting member from contacting the first weld mark in the thickness direction of the wall portion. This reduces the interference effect of the first weld mark on the current collecting member, thereby improving the connection quality between the current collecting member and the first terminal portion.

[0041] In some embodiments, along the thickness direction of the wall portion, the groove depth of the third groove is H2, which satisfies 0.1 mm ≤ H2 ≤ 0.5 mm.

[0042] In the above technical solution, by setting the groove depth of the third groove in the thickness direction of the wall portion to be greater than or equal to 0.1 mm, the avoidance effect of the third groove on the first weld mark is improved, thereby alleviating the interference effect of the first weld mark on the mutual connection between the third surface of the current collecting component and the first terminal portion, which is beneficial to improving the connection quality between the current collecting component and the first terminal portion. By setting the groove depth of the third groove in the thickness direction of the wall portion to be less than or equal to 0.5 mm, the phenomenon of excessive waste of the third groove is reduced. On the one hand, the overall structural strength of the first terminal portion can be improved, and on the other hand, the processing difficulty of the third groove can be reduced, thereby improving the processing efficiency of the first terminal portion.

[0043] In some embodiments, along the thickness direction of the wall portion, the first terminal portion has a second surface facing away from the electrode assembly, the second surface is provided with a fourth groove, and the second protrusion is inserted into the fourth groove and connected to the bottom surface of the fourth groove.

[0044] In the above technical solution, a fourth groove is provided on the second surface of the first terminal part facing away from the electrode assembly, and the second protrusion is inserted into the fourth groove and connected to the bottom surface of the fourth groove, so that this structure can play a certain positioning role in the mutual assembly of the first terminal part and the second terminal part, which is beneficial to improving the assembly accuracy between the first terminal part and the second terminal part, and can reduce the difficulty of assembly between the first terminal part and the second terminal part.

[0045] In some embodiments, the second protrusion is welded to the bottom surface of the fourth groove to form a first weld mark, and the first weld mark extends to a side of the first terminal portion facing the electrode assembly.

[0046] In the above technical solution, the second protrusion and the bottom surface of the fourth groove are welded together, and the first weld mark formed by the welding connection between the second protrusion and the bottom surface of the fourth groove extends to the side of the first terminal part facing the electrode assembly. The battery cell adopting this structure can weld and assemble the second protrusion and the bottom surface of the fourth groove from the side of the first terminal part facing the electrode assembly, thereby eliminating the need to penetrate the second limiting portion and the second protrusion from the side of the second terminal part away from the electrode assembly and then weld them to the first terminal part, which is beneficial to reducing the difficulty of welding the first terminal part and the second terminal part to each other and the power required for the welding connection.

[0047] In some embodiments, the battery cell further includes a current collecting member; the current collecting member is disposed between the wall portion and the electrode assembly, and the current collecting member connects the first terminal portion and the electrode assembly to electrically connect the first terminal portion and the electrode assembly; wherein, along the thickness direction of the wall portion, the first terminal portion has a third surface facing the electrode assembly, the current collecting member is connected to the third surface, and a second avoidance groove for avoiding the first weld mark is provided on the side of the current collecting member facing away from the electrode assembly.

[0048] In the above technical solution, the first terminal portion and the electrode assembly are connected via a current collecting member to achieve electrical connection between the electrode assembly and the electrode terminal, thereby reducing the difficulty of connecting the electrode assembly to the first terminal portion. Furthermore, by connecting the current collecting member to the third surface of the first terminal portion facing the electrode assembly, and providing a second avoidance groove on the side of the current collecting member facing away from the electrode assembly for avoiding the first weld mark, the first weld mark formed on the side of the first terminal portion facing the electrode assembly can be spaced apart from the current collecting member in the thickness direction of the wall portion via the second avoidance groove. This ensures that the current collecting member and the first weld mark do not contact each other in the thickness direction of the wall portion, thereby reducing the interference effect of the first weld mark on the current collecting member and improving the connection quality between the current collecting member and the third surface of the first terminal portion.

[0049] In some embodiments, a third protrusion is provided on the third surface, and the first weld mark extends to one end of the third protrusion facing the electrode assembly; wherein, along the thickness direction of the wall portion, the third protrusion is inserted into the second avoidance groove, and the third protrusion is spaced apart from the bottom surface of the second avoidance groove.

[0050] In the above technical solution, a third protrusion is provided on the third surface of the first terminal portion and is inserted into the second avoidance groove of the current collecting component, and the third protrusion and the bottom surface of the second avoidance groove are spaced apart in the thickness direction of the wall portion, so that the first weld mark extending to the third protrusion and the current collecting component are spaced apart in the thickness direction of the wall portion. At the same time, the third protrusion and the second avoidance groove can cooperate to play a certain positioning role for the current collecting component and the first terminal portion, which is beneficial to improving the assembly accuracy between the current collecting component and the first terminal portion.

[0051] In some embodiments, along the thickness direction of the wall portion, the distance between the third protrusion and the bottom surface of the second avoidance groove is H3, satisfying 0.1 mm ≤ H3 ≤ 0.5 mm.

[0052] In the above technical solution, by setting the interval between the third protrusion and the bottom surface of the second avoidance groove to be greater than or equal to 0.1 mm, the avoidance effect of the second avoidance groove on the first weld mark can be improved, thereby alleviating the interference effect of the first weld mark on the mutual connection between the current collecting component and the first terminal part, which is beneficial to improving the connection quality between the current collecting component and the first terminal part. By setting the interval between the third protrusion and the bottom surface of the second avoidance groove to be less than or equal to 0.5 mm, the space occupied by the current collecting component and the first terminal part in the thickness direction of the wall can be optimized, and the phenomenon of excessive waste of the second avoidance groove can be reduced. On the one hand, the structural strength of the current collecting component can be improved, and on the other hand, the processing difficulty of the second avoidance groove can be reduced, so as to improve the processing efficiency of the current collecting component.

[0053] In some embodiments, along the thickness direction of the wall portion, a second protrusion is formed on a side of the current collecting member facing the electrode assembly and corresponding to a position of the second avoidance groove.

[0054] In the above technical solution, a second convex portion is formed on the side of the current collecting component facing the electrode assembly and in the area corresponding to the second avoidance groove, so that the current collecting component is a structure that can be formed by stamping, so as to form the second avoidance groove and the second convex portion on both sides of the current collecting component respectively, which is conducive to reducing the manufacturing difficulty of the current collecting component.

[0055] In some embodiments, the first terminal portion and the second terminal portion are connected by welding.

[0056] In the above technical solution, by configuring the first and second terminal portions to be welded to each other, the connection strength between the first and second terminal portions is improved, thereby enhancing the structural stability of the electrode terminal when assembled to the wall portion. In addition, the structure of welding the first and second terminal portions can replace the riveting process to assemble the electrode terminal to the wall portion, thereby increasing the radial dimensions of the first and second terminal portions that are separately provided according to actual needs, which is beneficial to improving the structural strength of the first and second terminal portions.

[0057] In some embodiments, the first terminal portion has a first limiting portion, and along the thickness direction of the wall portion, the first limiting portion is located on the side of the wall portion facing the electrode assembly, and the first limiting portion is configured to cooperate with the second terminal portion to clamp the wall portion to limit the electrode terminal from detaching from the wall portion along the thickness direction of the wall portion; wherein, the battery cell also includes a current collecting component, which is arranged between the wall portion and the electrode assembly, and the current collecting component connects the electrode assembly and the first limiting portion.

[0058] In the above technical solution, the first terminal portion is provided with a first limiting portion, and the first limiting portion is located on the side of the wall portion facing the electrode assembly, so that the first limiting portion can cooperate with the second terminal portion to clamp the wall portion, and a current collecting component is also provided in the battery cell. The first limiting portion of the first terminal portion and the electrode assembly are connected through the current collecting component to achieve electrical connection between the electrode assembly and the electrode terminal. This structure can reduce the difficulty of electrical connection between the electrode assembly and the electrode terminal on the one hand, and reduce the difficulty of assembly between the current collecting component and the first terminal portion on the other hand.

[0059] In some embodiments, the first terminal portion is welded to the second terminal portion, and the current collecting member is welded to the first limiting portion; wherein, along the thickness direction of the wall portion, the thickness of the first limiting portion is greater than the thickness of the area where the first terminal portion and the second terminal portion are welded.

[0060] In the above technical solution, since the first limiting portion is located on the side of the wall portion facing the electrode assembly, the thickness of the first limiting portion is set to be greater than the thickness of the area where the first terminal portion and the second terminal portion are welded together, so as to realize a structure in which the first terminal portion is thickened in the area of ​​the first limiting portion, thereby alleviating the phenomenon of welding through the first limiting portion when the current collecting component is welded to the first limiting portion, thereby reducing the impact on the wall portion or other components of the battery cell when the current collecting component and the first limiting portion are welded to each other.

[0061] In some embodiments, the current collecting member is welded to the first limiting portion to form a second weld mark; the battery cell also includes a seal, which is arranged between the wall portion and the electrode terminal, and at least a portion of the seal is located in the mounting hole to seal the gap between the electrode terminal and the hole wall of the mounting hole, and along the thickness direction of the wall portion, the seal has a resting surface, and the resting surface rests on the side of the first limiting portion away from the electrode assembly; wherein, the projection of the second weld mark in the thickness direction of the wall portion does not overlap with the resting surface.

[0062] In the above technical solution, the second weld mark formed by welding the current collecting component to the first limiting portion is set so that the projection in the thickness direction of the wall portion does not overlap with the abutting surface of the seal, so that the second weld mark and the abutting surface of the seal against the first limiting portion are structures staggered in the thickness direction of the wall portion, thereby reducing the impact of the current collecting component and the first limiting portion on the seal when they are welded to each other, which is beneficial to alleviating the phenomenon of the seal being burned, and further effectively improving the sealing effect of the seal on the electrode terminal and the hole wall of the mounting hole.

[0063] In some embodiments, the current collecting member is welded to the first limiting portion; the battery cell also includes a seal, which is arranged between the wall portion and the electrode terminal, and at least a portion of the seal is located in the mounting hole to seal the gap between the electrode terminal and the hole wall of the mounting hole; wherein, along the thickness direction of the wall portion, the seal and the first limiting portion are spaced apart.

[0064] In the above technical solution, by arranging the first limiting portion and the sealing member at intervals in the thickness direction of the wall portion, the impact of the current collecting component and the first limiting portion on the sealing member when they are welded to each other can be reduced, which is beneficial to alleviate the phenomenon of the sealing member being burned out, and further can effectively improve the sealing effect of the sealing member on the electrode terminal and the hole wall of the mounting hole.

[0065] In some embodiments, the battery cell also includes a first insulating member; along the thickness direction of the wall portion, at least a portion of the first insulating member is located between the first limiting portion and the wall portion to insulate and isolate the first limiting portion and the wall portion; wherein the first insulating member extends between the sealing member and the first limiting portion to separate the sealing member from the first limiting portion.

[0066] In the above technical solution, a first insulating member for insulating and isolating the first limiting portion and the wall portion is further provided in the battery cell to reduce the risk of short circuit between the first limiting portion and the wall portion, and by setting the first insulating member to extend between the sealing member and the first limiting portion, the first insulating member can separate the sealing member and the first limiting portion, so that the sealing member and the first limiting portion are respectively located on both sides of the first insulating member in the thickness direction of the wall portion, thereby further reducing the impact of the current collecting component and the first limiting portion on the sealing member when they are welded to each other, which is conducive to further alleviating the phenomenon of the sealing member being burned out.

[0067] In some embodiments, the current collecting member is welded to the first limiting portion to form a second weld mark; the battery cell also includes a seal, which is arranged between the wall portion and the electrode terminal, and at least a portion of the seal is located in the mounting hole to seal the gap between the electrode terminal and the hole wall of the mounting hole, and along the thickness direction of the wall portion, the seal abuts against the side of the first limiting portion away from the electrode assembly; wherein, along the thickness direction of the wall portion, the distance between the second weld mark and the seal is L, satisfying 0.1mm≤L≤1.3mm.

[0068] In the above technical solution, by setting the spacing between the second weld mark formed by the mutual welding of the first limiting portion and the current collecting member and the seal in the thickness direction of the wall to be greater than or equal to 0.1 mm, the impact of the welding of the current collecting member and the first limiting portion on the seal is reduced, which helps alleviate the phenomenon of the seal burning, thereby effectively improving the sealing effect of the seal between the electrode terminal and the hole wall of the mounting hole. By setting the spacing between the second weld mark formed by the mutual welding of the first limiting portion and the current collecting member and the seal in the thickness direction of the wall to be less than or equal to 1.3 mm, the phenomenon of excessive spacing between the second weld mark and the seal resulting in excessive space occupied by the second weld mark and the seal is reduced, which helps improve the energy density of the battery cell and reduces the difficulty of sealing assembly.

[0069] In some embodiments, the first terminal portion and the second terminal portion do not overlap along a direction perpendicular to a thickness direction of the wall portion.

[0070] In the above technical solution, by arranging the first terminal portion and the second terminal portion so as not to overlap each other in a direction perpendicular to the thickness direction of the wall portion, the first terminal portion and the second terminal portion are arranged along the thickness direction of the wall portion and are not embedded in each other, thereby facilitating the connection of the first terminal portion and the second terminal portion, and being able to optimize the overall weight of the electrode terminal to improve the energy density of the battery cell.

[0071] In some embodiments, the first terminal portion has a first limiting portion, and the second terminal portion has a second limiting portion; wherein, along the thickness direction of the wall portion, the first limiting portion is located on the side of the wall portion facing the electrode assembly, and the second limiting portion is located on the side of the wall portion away from the electrode assembly, and the first limiting portion and the second limiting portion are configured to cooperate to clamp the wall portion.

[0072] In the above technical solution, the first terminal portion has a first limiting portion located on the side of the wall portion facing the electrode assembly, and the second terminal portion has a second limiting portion located on the side of the wall portion away from the electrode assembly, so that at least part of the wall portion is located between the first limiting portion and the second limiting portion, so that the first limiting portion and the second limiting portion can cooperate to clamp the wall portion. Therefore, through this structure, the first terminal portion and the second terminal portion can cooperate to clamp the wall portion to limit the electrode terminal from detaching from the wall portion along the thickness direction of the wall portion. The structure is simple and easy to assemble.

[0073] In some embodiments, the battery cell further includes a first insulating member; along the thickness direction of the wall portion, at least a portion of the first insulating member is located between the first limiting portion and the wall portion to insulate and isolate the first limiting portion and the wall portion.

[0074] In the above technical solution, the battery cell is also provided with a first insulating member, and at least part of the first insulating member is located between the first limiting portion and the wall portion, so that the first insulating member can play the role of insulating and isolating the first limiting portion and the wall portion, thereby reducing the risk of short circuit between the first limiting portion and the wall portion, which is beneficial to improving the reliability of the battery cell.

[0075] In some embodiments, the battery cell further includes a second insulating member; along the thickness direction of the wall portion, at least a portion of the second insulating member is located between the second limiting portion and the wall portion to insulate and isolate the second limiting portion and the wall portion.

[0076] In the above technical solution, the battery cell is also provided with a second insulating member, and at least part of the second insulating member is located between the second limiting portion and the wall portion, so that the second insulating member can play the role of insulating and isolating the second limiting portion and the wall portion, thereby reducing the risk of short circuit between the second limiting portion and the wall portion, which is beneficial to improving the reliability of the battery cell.

[0077] In some embodiments, a receiving groove is provided on the side of the wall portion facing away from the electrode assembly along the thickness direction of the wall portion, the mounting hole is provided on the bottom surface of the receiving groove, and at least a portion of the second insulating member is received in the receiving groove.

[0078] In the above technical solution, by providing a receiving groove for accommodating the second insulating part on the side of the wall portion away from the electrode assembly, it is convenient to assemble the second insulating part between the second limiting portion and the wall portion, which can play a role in assembly positioning of the second insulating part, which is beneficial to reducing the difficulty of assembling the second insulating part, and can play a certain protective role for the second insulating part, so as to reduce the wear or damage of the second insulating part during use.

[0079] In some embodiments, the second terminal portion includes a first material layer and a second material layer that are composited with each other, the first material layer is connected to the first terminal portion, and the second material layer is used to be connected to the busbar component; wherein, the material of the first material layer and the material of the second material layer are different, the material of the first material layer is the same as the material of the first terminal portion, and the material of the second material layer is the same as the material of the busbar component.

[0080] In the above technical solution, the second terminal portion is arranged to be composed of a first material layer and a second material layer that are compositely connected to each other, and the material of the first material layer is the same as the material of the first terminal portion, and the material of the second material layer is the same as the material of the convergence component, so that the first terminal portion can be connected to the pole ear of the electrode assembly with the same material, and the second material layer of the second terminal portion can be connected to the convergence component with the same material, so that the electrode terminal of this structure can realize the connection between the pole ear of the electrode assembly of different materials and the convergence component, which is beneficial to improving the overcurrent effect and can alleviate the quality problems caused by the mutual assembly and connection between different materials.

[0081] In some embodiments, the first material layer and the second material layer are stacked along the thickness direction of the wall portion, and the first material layer is located on a side of the second material layer facing the electrode assembly.

[0082] In the above technical solution, the first material layer and the second material layer of the second terminal part are arranged as a stacked structure along the thickness direction of the wall part, and the first material layer is located on the side of the second material layer facing the electrode assembly. The second terminal part adopting this structure can, on the one hand, realize the facing arrangement of the first material layer and the first terminal part, so as to facilitate the mutual assembly and connection of the first material layer and the first terminal part, and on the other hand, facilitate the composite connection of the first material layer and the second material layer, which is beneficial to reduce the difficulty of composite connection of the first material layer and the second material layer.

[0083] In some embodiments, the housing includes a shell and an end cover; a receiving cavity with an opening is formed inside the shell, and the receiving cavity is used to receive the electrode assembly; the end cover closes the opening; wherein the end cover is the wall portion.

[0084] In the above technical solution, by setting the wall portion of the shell as the end cover for closing the opening of the shell, the battery cell adopting this structure is convenient for assembling the electrode terminal on the end cover, and is convenient for assembling and connecting the electrode terminal and the electrode assembly with each other, which is beneficial to reducing the difficulty of assembling the battery cell and improving the production efficiency of the battery cell.

[0085] In some embodiments, the outer shell includes a shell and an end cover; the shell includes an integrally formed side wall and the wall portion, the side wall is arranged around the wall portion, and along the thickness direction of the wall portion, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a accommodating cavity for accommodating the electrode assembly; the end cover closes the opening.

[0086] In the above technical solution, by setting the wall portion of the shell as a wall arranged opposite to the end cover in the thickness direction of the wall portion of the shell, the battery cell adopting this structure can make the area of ​​the shell where the electrode terminal is installed away from the end cover, and make there no direct connection relationship between the wall portion and the end cover, thereby alleviating the phenomenon that the force generated when the electrode terminal and other components pull or twist the wall portion acts on the end cover, thereby reducing the risk of connection failure between the end cover and the shell, and further helping to reduce the risk of leakage of the battery cell during use.

[0087] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0088] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0090] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0091] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0092] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0093] FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0094] FIG5 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0095] FIG6 is a cross-sectional view of an electrode terminal of a battery cell provided in some embodiments of the present application;

[0096] FIG7 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0097] FIG8 is a partial cross-sectional view of a battery cell provided in other embodiments of the present application;

[0098] FIG9 is a partial cross-sectional view of a battery cell provided in some further embodiments of the present application;

[0099] FIG10 is a cross-sectional view of an electrode terminal of a battery cell provided in some further embodiments of the present application;

[0100] FIG11 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0101] FIG12 is a cross-sectional view of an electrode terminal of a battery cell provided in some other embodiments of the present application;

[0102] FIG13 is a partial cross-sectional view of a battery cell provided in yet other embodiments of the present application;

[0103] FIG14 is a partial cross-sectional view of a battery cell provided in yet other embodiments of the present application;

[0104] FIG15 is a cross-sectional view of an electrode terminal of a battery cell provided in some embodiments of the present application in another embodiment;

[0105] FIG16 is an exploded view of the structure of the electrode terminal of the battery cell provided in some embodiments of the present application in other embodiments.

[0106] Icons: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery cell; 21-housing; 211-wall; 2111-mounting hole; 2112-accommodating groove; 212-housing; 2121-opening; 213-end cover; 22-electrode assembly; 221-ear; 23-electrode terminal; 231-first terminal portion; 2311-first limiting portion; 2311a-first surface; 2312-first protrusion; 2313-first groove; 2314-second surface; 2314a-fourth groove; 2315-third Surface; 2315a-third groove; 2315b-third protrusion; 232-second terminal portion; 2321-second limiting portion; 2322-second protrusion; 233-first weld mark; 234-first material layer; 235-second material layer; 24-current collecting component; 241-first convex portion; 2411-first avoidance groove; 242-second groove; 243-second avoidance groove; 244-second convex portion; 25-first insulating member; 26-second insulating member; 27-sealing member; 271-rest surface; 28-second weld mark; 200-controller; 300-motor; X-thickness direction of the wall. DETAILED DESCRIPTION

[0107] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0108] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0109] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0110] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0111] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0112] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0113] The term "plurality" used in this application refers to two or more (including two).

[0114] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0115] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0116] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0117] 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.

[0118] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0119] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, 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. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may 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.).

[0120] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional 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. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and at least one of its modified compounds, etc.

[0121] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0122] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0123] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. may be used. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, etc. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may 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.).

[0124] 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.

[0125] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0126] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. 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, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0127] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0128] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0129] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0130] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0131] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0132] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0133] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0134] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0135] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0136] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0137] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0138] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0139] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0140] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0141] In some embodiments, the electrode assembly is a laminate structure.

[0142] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0143] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0144] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0145] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0146] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0147] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0148] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0149] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0150] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include but are not limited to square-shell, blade-shaped, and polygonal batteries, such as hexagonal batteries.

[0151] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0152] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0153] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0154] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0155] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0156] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a vital component of today's new energy development. The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the battery's operational stability must also be considered.

[0157] For a typical battery cell, the outer shell of the battery cell typically includes a housing and an end cap, with the end cap being fitted over the opening of the housing. To facilitate assembly of the battery cell, the electrode terminal is typically riveted to the end cap of the battery cell, i.e., the electrode terminal is an integral structure. The riveted assembly forms a flange structure on the electrode terminal to facilitate assembly of the electrode terminal to the end cap. This allows the electrode terminal to be welded to the electrode assembly's tabs via a current collecting member disposed within the housing when the end cap is assembled with the housing, thereby achieving electrical connection between the electrode terminal and the electrode assembly. The electrode terminal then serves as the output terminal of the battery cell, enabling electrical energy to be input or output from the battery cell. Finally, the end cap is connected to the housing. However, in battery cells with this structure, the riveted flange of the electrode terminal is relatively short, resulting in a weak structural strength of the riveted flange structure. This results in low structural strength and poor structural stability when the electrode terminal is assembled to the end cap of the housing, making it prone to falling off during use. This, in turn, leads to poor stability and a short service life for the battery cell.

[0158] Based on the above considerations, in order to solve the problem of poor stability and short service life of battery cells, an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly and an electrode terminal. The shell has a wall portion, and the wall portion is provided with a mounting hole, and the mounting hole penetrates the wall portion along the thickness direction of the wall portion. The electrode assembly is accommodated in the shell. The electrode terminal is passed through the mounting hole, and the electrode terminal includes a first terminal portion and a second terminal portion which are separately provided. The first terminal portion and the second terminal portion are arranged and connected along the thickness direction of the wall portion, and at least a part of the first terminal portion is located on the side of the wall portion facing the electrode assembly, and the first terminal portion is electrically connected to the electrode assembly, and at least a part of the second terminal portion is located on the side of the wall portion away from the electrode assembly, and the first terminal portion and the second terminal portion are configured to cooperate with the clamping wall portion to limit the electrode terminal from detaching from the wall portion along the thickness direction of the wall portion.

[0159] In a battery cell of this structure, the electrode terminal is provided with a first terminal portion and a second terminal portion which are arranged and connected along the thickness direction of the wall portion, and at least a portion of the first terminal portion is located on the side of the wall portion facing the electrode assembly, and at least a portion of the second terminal portion is located on the side of the wall portion away from the electrode assembly, so that the first terminal portion and the second terminal portion can cooperate to clamp the wall portion, thereby realizing the assembly of the electrode terminal to the wall portion. A battery cell adopting this structure does not require the electrode terminal to be assembled on the wall portion through a riveting process, and the radial dimensions of the separately arranged first terminal portion and the second terminal portion can be increased according to actual needs, which is conducive to improving the structural strength of the first terminal portion and the second terminal portion, thereby effectively improving the structural strength and structural stability of the electrode terminal assembled on the wall portion, so as to reduce the risk of the electrode terminal falling off during use, and thus is conducive to improving the stability and service life of the battery cell.

[0160] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This helps alleviate the problem of electrode terminals easily falling off during use, thereby improving the stability and service life of the battery cells.

[0161] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0162] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0163] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000. The battery 100 can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can be used as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0164] In some embodiments of the present application, the battery 100 can not only serve as the operating power source or usage power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0165] 2 and 3 , FIG2 is an exploded view of a battery 100 according to some embodiments of the present invention, and FIG3 is a schematic diagram of a battery cell 20 according to some embodiments of the present invention. The battery 100 includes a housing 10 and a battery cell 20 , wherein the battery cell 20 is accommodated in the housing 10 .

[0166] The housing 10 is used to provide assembly space for the battery cells 20 and can adopt a variety of structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 cover each other, and the first housing body 11 and the second housing body 12 jointly define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open, and the first housing body 11 can be a plate-like structure. The first housing body 11 covers the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define the assembly space. The first housing body 11 and the second housing body 12 can also be hollow structures with one end open, and the open side of the first housing body 11 covers the open side of the second housing body 12.

[0167] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid or a cube, etc. For example, in FIG2 , the box body 10 is in the shape of a cuboid.

[0168] In the battery 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, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel configurations within the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 10.

[0169] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20. The busbar component plays the role of connecting multiple battery cells 20 in series, in parallel, or in hybrid connection. The material of the busbar component can be copper, iron, aluminum, steel, aluminum alloy, etc.

[0170] 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 thereto. The battery cell 20 can be a rectangular parallelepiped, a cylinder, a prism, or other shapes. For example, in FIG3 , the battery cell 20 is a rectangular parallelepiped.

[0171] According to some embodiments of the present application, referring to FIG3 and further referring to FIG4, FIG5 and FIG6, FIG4 is an exploded view of the structure of a battery cell 20 provided in some embodiments of the present application, FIG5 is a partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application, and FIG6 is a cross-sectional view of an electrode terminal 23 of a battery cell 20 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22 and an electrode terminal 23. The housing 21 has a wall portion 211, and the wall portion 211 is provided with a mounting hole 2111. The mounting hole 2111 passes through the wall portion 211 along the thickness direction X of the wall portion. The electrode assembly 22 is accommodated in the housing 21. The electrode terminal 23 is inserted into the mounting hole 2111. The electrode terminal 23 includes a first terminal portion 231 and a second terminal portion 232 which are separately arranged. The first terminal portion 231 and the second terminal portion 232 are arranged and connected along the thickness direction X of the wall portion. At least a portion of the first terminal portion 231 is located on the side of the wall portion 211 facing the electrode assembly 22 and is electrically connected to the electrode assembly 22. At least a portion of the second terminal portion 232 is located on the side of the wall portion 211 away from the electrode assembly 22. The first terminal portion 231 and the second terminal portion 232 are configured to cooperate with the clamping wall portion 211.

[0172] The housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms. The housing 21 can also be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloys.

[0173] In some embodiments, the housing 21 may include a shell 212 and an end cover 213, wherein a accommodating cavity is formed inside the shell 212, and the accommodating cavity has an opening 2121, that is, the shell 212 is a hollow structure with one end open, and the end cover 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0174] Optionally, the wall portion 211 for mounting the electrode terminal 23 and having the mounting hole 2111 may be the end cap 213, or may be one of the multiple walls of the housing 212. For example, in Figures 3 and 4, the wall portion 211 is the end cap 213 of the housing 21. Of course, in other embodiments, the wall portion 211 may also be the bottom wall of the housing 212 disposed opposite the end cap 213 in the thickness direction X of the wall portion, or a side wall adjacent to and abutting the end cap 213.

[0175] When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 212 , and the housing 212 may be filled with electrolyte. The end cap 213 may then be placed on the opening 2121 of the housing 212 to seal the opening 2121 of the housing 212 .

[0176] The mounting hole 2111 penetrates the wall portion 211 along the thickness direction X of the wall portion. That is, the mounting hole 2111 extends along the thickness direction X of the wall portion and penetrates the surfaces of both sides of the wall portion 211 .

[0177] The housing 212 can have a variety of shapes, such as a cylinder or a rectangular parallelepiped. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, the housing 212 can have a cylindrical structure; if the electrode assembly 22 has a rectangular parallelepiped structure, the housing 212 can have a rectangular parallelepiped structure. Of course, the end cap 213 can also have a variety of structures, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 4, the housing 212 has a rectangular parallelepiped structure.

[0178] It is understandable that the shell 21 is not limited to the above structure. The shell 21 can also be other structures. For example, the shell 21 includes a shell 212 and two end covers 213. The shell 212 is a hollow structure with openings 2121 on opposite sides. One end cover 213 corresponds to an opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0179] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet, or it can be a stacked structure formed by stacking the positive electrode sheet, the separator and the negative electrode sheet.

[0180] Exemplarily, the separator is an isolation membrane, and the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0181] The electrode assembly 22 has a tab 221 formed at one end near the wall 211 in the thickness direction X of the wall. The tab 221 is used to input or output the positive or negative electrode of the electrode assembly 22. The tab 221 is used to connect to the electrode terminal 23 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23. It should be noted that the tab 221 of the electrode assembly 22 is formed by the stacked connection of the regions of the positive electrode sheet not coated with the positive electrode active material layer, or the stacked connection of the regions of the negative electrode sheet not coated with the negative electrode active material layer. If the tab 221 is used to output the positive electrode of the electrode assembly 22, the tab 221 is formed by the stacked connection of the regions of the positive electrode sheet not coated with the positive electrode active material layer; if the tab 221 is used to output the negative electrode of the electrode assembly 22, the tab 221 is formed by the stacked connection of the regions of the negative electrode sheet not coated with the negative electrode active material layer.

[0182] For example, the material of the tab 221 may be copper or aluminum.

[0183] Optionally, the number of electrode assemblies 22 housed in the housing 21 may be one or more. For example, in FIG4 , the housing 21 of the battery cell 20 is provided with two electrode assemblies 22 , which are stacked along the thickness direction thereof. In other words, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the number of electrode assemblies 22 housed in the housing 21 may be one, three, four, five, six, seven, or eight, etc.

[0184] The electrode terminal 23 serves to output or input the electrical energy of the battery cell 20 . One end of the electrode terminal 23 is used to connect to the tab 221 of the electrode assembly 22 , and the other end is used to connect to the busbar component to realize the input or output of the electrical energy of the battery cell 20 .

[0185] For example, the electrode terminal 23 can be made of a variety of materials, for example, copper, iron, aluminum, steel, aluminum alloy, etc. Of course, in some embodiments, the electrode terminal 23 can also be made of a composite material, that is, the electrode terminal 23 is formed by connecting two metals of different materials together, for example, by hot pressing or cold pressing.

[0186] The electrode terminal 23 is inserted into the mounting hole 2111, that is, the electrode terminal 23 passes through the mounting hole 2111, and the mounting holes 2111 are extended from both ends of the electrode terminal 23 in the thickness direction X of the wall, so that part of the electrode terminal 23 is located in the mounting hole 2111, so that the electrode terminal 23 can be connected to the electrode assembly 22 located in the outer shell 21, and can also be connected to the busbar component located outside the battery cell 20 to realize the input or output of electrical energy of the battery cell 20.

[0187] The electrode terminal 23 includes a first terminal portion 231 and a second terminal portion 232 which are separately arranged. The first terminal portion 231 and the second terminal portion 232 are arranged and connected along the thickness direction X of the wall portion. That is, the electrode terminal 23 is composed of two parts, the first terminal portion 231 and the second terminal portion 232 which are separately arranged. The first terminal portion 231 and the second terminal portion 232 are structures which are arranged along the thickness direction X of the wall portion. By connecting the first terminal portion 231 and the second terminal portion 232 to each other, the electrode assembly 22 can be electrically connected to the second terminal portion 232 through the first terminal portion 231, thereby realizing the input or output of electrical energy of the electrode assembly 22.

[0188] The first terminal portion 231 is used to be electrically connected to the electrode assembly 22 , and the second terminal portion 232 is used to be electrically connected to the busbar component to implement input or output of electrical energy of the battery cell 20 .

[0189] It should be noted that the first terminal portion 231 and the second terminal portion 232 are structures arranged along the thickness direction X of the wall portion. The first terminal portion 231 and the second terminal portion 232 can be structures that are independent of each other and arranged in sequence along the thickness direction X of the wall portion, or they can be structures that are partially embedded in each other, that is, part of the first terminal portion 231 can be inserted into the second terminal portion 232, or part of the second terminal portion 232 can be inserted into the first terminal portion 231.

[0190] Optionally, the connection structure between the first terminal portion 231 and the second terminal portion 232 can be various, such as welding, clamping, or bolting.

[0191] At least a portion of the first terminal portion 231 is located on the side of the wall portion 211 facing the electrode assembly 22. The first terminal portion 231 is electrically connected to the electrode assembly 22, that is, the first terminal portion 231 serves to connect the electrode assembly 22, and the first terminal portion 231 has a portion located on the side of the wall portion 211 facing the electrode assembly 22. In other words, at least a portion of the first terminal portion 231 overlaps with the wall portion 211 in the thickness direction X of the wall portion, and this portion is located on the side of the wall portion 211 facing the electrode assembly 22. It should be noted that the first terminal portion 231 is connected to the tab 221 of the electrode assembly 22 to achieve electrical connection between the first terminal portion 231 and the electrode assembly 22. The first terminal portion 231 can be directly connected to the tab 221 of the electrode assembly 22, for example, by welding or abutment, or can be indirectly connected to the tab 221 of the electrode assembly 22 through other components.

[0192] In some embodiments, in Figures 4 and 5, the battery cell 20 may further include a current collecting member 24, which is disposed in the outer shell 21 and connects the first terminal portion 231 and the tab 221 of the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23.

[0193] Illustratively, the current collecting member 24 is welded to the first terminal portion 231 and is also welded to the tab 221. Of course, in other embodiments, the current collecting member 24 may also be in contact with or bonded to the first terminal portion 231, and similarly, the current collecting member 24 may also be in contact with or bonded to the tab 221.

[0194] At least a portion of the second terminal portion 232 is located on the side of the wall portion 211 away from the electrode assembly 22, that is, the second terminal portion 232 has a portion located on the side of the wall portion 211 away from the electrode assembly 22, that is, at least a portion of the second terminal portion 232 overlaps with the wall portion 211 in the thickness direction X of the wall portion, and the portion is located on the side of the wall portion 211 away from the electrode assembly 22.

[0195] The electrode terminal 23 is insulated and mounted on the wall portion 211, i.e., no electrical connection is formed between the electrode terminal 23 and the wall portion 211. In some embodiments, as shown in Figures 4 and 5, the battery cell 20 may further include a first insulating member 25 and a second insulating member 26. The first insulating member 25 is located on the side of the wall portion 211 facing the electrode assembly 22, and at least a portion of the first insulating member 25 is located between the wall portion 211 and the first terminal portion 231 to insulate and separate the wall portion 211 and the first terminal portion 231. The second insulating member 26 is located on the side of the wall portion 211 facing away from the electrode assembly 22, and at least a portion of the second insulating member 26 is located between the wall portion 211 and the second terminal portion 232 to insulate and separate the wall portion 211 and the second terminal portion 232.

[0196] Optionally, the first insulating member 25 and the second insulating member 26 may be made of various materials. For example, the first insulating member 25 and the second insulating member 26 may be made of rubber, silicone, plastic, or the like.

[0197] The first terminal portion 231 and the second terminal portion 232 are configured to cooperate with the clamping wall portion 211, that is, the portion of the first terminal portion 231 located on the side of the wall portion 211 facing the electrode assembly 22 and the portion of the second terminal portion 232 located on the side of the wall portion 211 away from the electrode assembly 22 can cooperate with each other to clamp the wall portion 211 to assemble the electrode terminal 23 to the wall portion 211, thereby limiting the electrode terminal 23 from detaching from the wall portion 211 along the thickness direction X of the wall portion.

[0198] It should be noted that the first terminal portion 231 and the second terminal portion 232 can be directly matched with the clamping wall portion 211, that is, the portion of the first terminal portion 231 located on the side of the wall portion 211 facing the electrode assembly 22 and the portion of the second terminal portion 232 located on the side of the wall portion 211 away from the electrode assembly 22 directly abut against the wall portion 211. Of course, the first terminal portion 231 and the second terminal portion 232 can be indirectly matched with the clamping wall portion 211, that is, the portion of the first terminal portion 231 located on the side of the wall portion 211 facing the electrode assembly 22 and the portion of the second terminal portion 232 located on the side of the wall portion 211 away from the electrode assembly 22 indirectly abut against the wall portion 211 through other components. For example, in FIG5 , the first terminal portion 231 is indirectly abutted against the wall portion 211 through the first insulating member 25. Similarly, the second terminal portion 232 is indirectly abutted against the wall portion 211 through the second insulating member 26.

[0199] In some embodiments, the battery cell 20 may further include a seal 27, which is disposed between the wall portion 211 and the electrode terminal 23, and at least a portion of the seal 27 is located within the mounting hole 2111. The seal 27 is configured to seal the gap between the electrode terminal 23 and the wall surface of the mounting hole 2111.

[0200] For example, the sealing member 27 may be made of rubber, silicone, plastic, or the like.

[0201] In Figure 4, the battery cell 20 includes two electrode terminals 23 and two current collecting members 24. Correspondingly, each electrode assembly 22 has two pole tabs 221, and the polarities of the two pole tabs 221 are opposite. The two electrode terminals 23 are electrically connected to the two pole tabs 221 of the electrode assembly 22 through the two current collecting members 24 to realize the input or output of the positive and negative electrodes of the battery cell 20.

[0202] Optionally, both electrode terminals 23 are mounted on the wall portion 211, and each electrode terminal 23 is electrically connected to a tab 221 of the electrode assembly 22 to output the positive and negative electrodes of the battery cell 20. Of course, in other embodiments, the two electrode terminals 23 can also be mounted on different walls of the housing 21.

[0203] In some embodiments, the battery cell 20 may further include a pressure relief mechanism disposed on the housing 21 , and configured to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0204] Optionally, the pressure relief mechanism may be provided on the end cover 213 of the housing 21, or may be provided on the shell 212 of the housing 21. Similarly, the pressure relief mechanism and the housing 21 may be an integrally formed structure, or may be a separate structure. If the pressure relief mechanism and the housing 21 are a separate structure, the pressure relief mechanism may be connected to the housing 21 by welding or the like. Correspondingly, the pressure relief mechanism may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, an air valve, a pressure relief valve, or a safety valve. If the pressure relief mechanism and the housing 21 are an integrally formed structure, the pressure relief mechanism is an area on the housing 21 where a weak structure is formed, for example, an area on the housing 21 where a notch groove is provided.

[0205] The electrode terminal 23 is provided with a first terminal portion 231 and a second terminal portion 232 arranged and connected along the thickness direction X of the wall portion, and at least a portion of the first terminal portion 231 is located on the side of the wall portion 211 facing the electrode assembly 22, and at least a portion of the second terminal portion 232 is located on the side of the wall portion 211 away from the electrode assembly 22, so that the first terminal portion 231 and the second terminal portion 232 can cooperate to clamp the wall portion 211, thereby realizing the assembly of the electrode terminal 23 to the wall portion 211, so as to limit the electrode terminal 23 from being separated from the wall portion 211 along the thickness direction X of the wall portion. The battery cell 20 adopting this structure does not need to assemble the electrode terminal 23 on the wall portion 211 through a riveting process. The radial dimensions of the first terminal portion 231 and the second terminal portion 232 that are separately arranged can be increased according to actual needs, which is beneficial to improving the structural strength of the first terminal portion 231 and the second terminal portion 232, thereby effectively improving the structural strength and structural stability of the electrode terminal 23 assembled on the wall portion 211, so as to reduce the risk of the electrode terminal 23 falling off during use, which is beneficial to improving the stability and service life of the battery cell 20.

[0206] According to some embodiments of the present application, as shown in Figures 5 and 6, the first terminal portion 231 may include a first limiting portion 2311 and a first protrusion 2312. Along the thickness direction X of the wall portion, the first limiting portion 2311 is located on the side of the wall portion 211 facing the electrode assembly 22, and the first limiting portion 2311 is configured to cooperate with the second terminal portion 232 to clamp the wall portion 211. The first protrusion 2312 is provided on the side of the first limiting portion 2311 facing away from the electrode assembly 22, and the first protrusion 2312 is provided along the thickness direction X of the wall portion to penetrate the mounting hole 2111 and connect to the second terminal portion 232.

[0207] Among them, the first limiting portion 2311 is located on the side of the wall portion 211 facing the electrode assembly 22, that is, the first limiting portion 2311 of the first terminal portion 231 is located on the side of the wall portion 211 facing the inside of the shell 21, so that the first limiting portion 2311 is located inside the shell 21.

[0208] The first protrusion 2312 is protruded from the side of the first limiting portion 2311 away from the electrode assembly 22 , that is, the first protrusion 2312 is a structure extending and protruding from the side of the first limiting portion 2311 away from the electrode assembly 22 in a direction away from the electrode assembly 22 .

[0209] The first protrusion 2312 passes through the mounting hole 2111 along the thickness direction X of the wall portion and is connected to the second terminal portion 232 . That is, the first protrusion 2312 is inserted into the mounting hole 2111 of the wall portion 211 and is connected to the second terminal portion 232 .

[0210] The first terminal portion 231 is provided with a first limiting portion 2311 and a first protrusion 2312. The first limiting portion 2311 is located on the side of the wall portion 211 facing the electrode assembly 22, so that the first limiting portion 2311 can cooperate with the second terminal portion 232 to clamp the wall portion 211, and the first protrusion 2312 is protruded on the side of the first limiting portion 2311 away from the electrode assembly 22, and is passed through the mounting hole 2111, so that the first terminal portion 231 can be connected to the second terminal portion 232 through the first protrusion 2312 passed through the mounting hole 2111, so that the first terminal portion 231 and the second terminal portion 232 are arranged and connected along the thickness direction X of the wall portion, which is conducive to reducing the difficulty of connecting the first terminal portion 231 and the second terminal portion 232 to each other.

[0211] In some embodiments, referring to Figures 5 and 6 , the second terminal portion 232 may include a second limiting portion 2321 and a second protrusion 2322. Along the thickness direction X of the wall portion, the second limiting portion 2321 is located on the side of the wall portion 211 facing away from the electrode assembly 22, and at least a portion of the wall portion 211 is located between the second limiting portion 2321 and the first limiting portion 2311. The second limiting portion 2321 is configured to cooperate with the first limiting portion 2311 to clamp the wall portion 211. The second protrusion 2322 is provided on the side of the second limiting portion 2321 facing the electrode assembly 22, and the second protrusion 2322 is connected to the first protrusion 2312.

[0212] Among them, the second limiting portion 2321 is located on the side of the wall portion 211 away from the electrode assembly 22, that is, the second limiting portion 2321 of the second terminal portion 232 is located on the side of the wall portion 211 away from the inside of the shell 21, so that the second limiting portion 2321 is located outside the shell 21.

[0213] At least a portion of the wall portion 211 is located between the second limiting portion 2321 and the first limiting portion 2311, that is, at least a portion of the wall portion 211 is clamped between the first limiting portion 2311 and the second limiting portion 2321 to enable the electrode terminal 23 to be assembled to the wall portion 211, that is, in the thickness direction X of the wall portion, at least a portion of the wall portion 211 overlaps with the first limiting portion 2311 and the second limiting portion 2321.

[0214] The second protrusion 2322 is protruding from the side of the second limiting portion 2321 facing the electrode assembly 22, and the second protrusion 2322 is connected to the first protrusion 2312, that is, the first protrusion 2312 of the first terminal portion 231 is connected to the second protrusion 2322 of the second terminal portion 232, so as to realize that the first terminal portion 231 and the second terminal portion 232 are arranged and connected along the thickness direction X of the wall portion. Of course, in other embodiments, the second terminal portion 232 may not be provided with the second protrusion 2322, that is, the first protrusion 2312 may be directly connected to the side of the second limiting portion 2321 facing the electrode assembly 22.

[0215] The second terminal portion 232 is provided with a second limiting portion 2321 and a second protrusion 2322. The second limiting portion 2321 is located on the side of the wall portion 211 away from the electrode assembly 22, so that the second limiting portion 2321 can cooperate with the first limiting portion 2311 to clamp the wall portion 211, and the second protrusion 2322 is protruded on the side of the second limiting portion 2321 facing the electrode assembly 22, so as to facilitate the mutual connection between the first terminal portion 231 and the second terminal portion 232 through the structure in which the first protrusion 2312 and the second protrusion 2322 are interconnected. The structure is simple and easy to assemble, and it is beneficial to optimize the size of the first protrusion 2312 protruding from the first limiting portion 2311, so as to reduce the processing difficulty of the first terminal portion 231.

[0216] According to some embodiments of the present application, as shown in FIG. 5 and FIG. 6 , along the thickness direction X of the wall portion, a first groove 2313 is formed on a side of the first terminal portion 231 facing the electrode assembly 22 and corresponding to a position of the first protrusion 2312 .

[0217] Illustratively, the first protrusion 2312 disposed on the side of the first limiting portion 2311 facing away from the electrode assembly 22 is formed by a stamping process, so that the first protrusion 2312 is formed on the side of the first limiting portion 2311 facing away from the electrode assembly 22, and the first groove 2313 is formed on the side of the first limiting portion 2311 facing the electrode assembly 22 and at a position corresponding to the first protrusion 2312. Of course, the processing method of the first protrusion 2312 disposed on the side of the first limiting portion 2311 facing away from the electrode assembly 22 is not limited to this. In other embodiments, the first protrusion 2312 disposed on the side of the first limiting portion 2311 facing away from the electrode assembly 22 can also be formed by a processing process such as casting or milling.

[0218] By forming the first groove 2313 on the side of the first terminal portion 231 facing the electrode assembly 22 and in the area corresponding to the first protrusion 2312, the first terminal portion 231 is configured to be formed by stamping, thereby forming the first protrusion 2312 and the first groove 2313 on both sides of the first terminal portion 231, respectively. This helps to reduce the difficulty of manufacturing the first terminal portion 231. In addition, by providing the first groove 2313 on the first terminal portion 231, the thickness of the first terminal portion 231 in the area where the first protrusion 2312 is provided can be reduced, thereby reducing the difficulty of assembling and connecting the first protrusion 2312 and the second terminal portion 232.

[0219] According to some embodiments of the present application, as shown in Figures 5 and 6, the first protrusion 2312 is welded to the second terminal portion 232 to form a first weld mark 233, and at least a portion of the first weld mark 233 is formed on the bottom surface of the first groove 2313.

[0220] Among them, the first protrusion 2312 is welded to the second terminal portion 232 to form a first weld mark 233, that is, the first protrusion 2312 of the first terminal portion 231 and the second terminal portion 232 are structures connected to each other by welding, and a first weld mark 233 is formed between the first protrusion 2312 of the first terminal portion 231 and the second terminal portion 232.

[0221] At least part of the first weld mark 233 is formed on the bottom surface of the first groove 2313, that is, the first weld mark 233 formed by welding the first protrusion 2312 and the second terminal portion 232 of the first terminal portion 231 to each other extends to the bottom surface of the first groove 2313, that is, the first protrusion 2312 and the second terminal portion 232 of the first terminal portion 231 are a structure that is welded from one side of the bottom surface of the first groove 2313.

[0222] For example, the first protrusion 2312 of the first terminal portion 231 and the second terminal portion 232 may be welded to each other by a welding process such as laser welding or ultrasonic welding.

[0223] It should be noted that, in an embodiment in which the second terminal portion 232 includes a second limiting portion 2321 and a second protrusion 2322, as shown in Figure 6, the first protrusion 2312 is a structure welded to the second protrusion 2322, and the first weld mark 233 is formed between the first protrusion 2312 and the second protrusion 2322.

[0224] By setting the first protrusion 2312 and the second terminal portion 232 as a structure that is welded to each other, and at least a portion of the first weld mark 233 formed by welding the first protrusion 2312 and the second terminal portion 232 to each other is formed on the bottom surface of the first groove 2313, so that the first weld mark 233 is a structure extending into the first groove 2313, the battery cell 20 adopting this structure can weld and assemble the first protrusion 2312 and the second terminal portion 232 from the side where the first groove 2313 is provided on the first terminal portion 231, so that the first terminal portion 231 and the second terminal portion 232 are welded to each other from the side where the first groove 2313 is formed on the first terminal portion 231 and the thinned area is formed, thereby reducing the difficulty of welding the first terminal portion 231 and the second terminal portion 232 to each other and the power required for the welding connection.

[0225] According to some embodiments of the present application, as shown in Figures 4 and 5 , the battery cell 20 may further include a current collecting member 24. The current collecting member 24 is disposed between the wall portion 211 and the electrode assembly 22. The current collecting member 24 connects the first terminal portion 231 and the electrode assembly 22 to electrically connect the first terminal portion 231 and the electrode assembly 22. The current collecting member 24 is spaced apart from the first weld mark 233.

[0226] The current collecting member 24 connects the first terminal portion 231 of the electrode terminal 23 to the tab 221 of the electrode assembly 22, thereby achieving electrical connection between the electrode assembly 22 and the electrode terminal 23. The current collecting member 24 can be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloy.

[0227] Alternatively, in FIG. 4 and FIG. 5 , there are two electrode terminals 23 and two current collecting members 24 , and each electrode terminal 23 is connected to the electrode assembly 22 via one current collecting member 24 to output the positive and negative electrodes of the battery cell 20 .

[0228] In FIG5 , a portion of the current collecting member 24 is located between the first terminal portion 231 and the electrode assembly 22 to connect the first terminal portion 231 to the tab 221 of the electrode assembly 22. The current collecting member 24 is spaced apart from the first weld mark 233. That is, the first weld mark 233 formed by the weld connection between the current collecting member 24 and the first and second terminal portions 231 and 232 does not contact each other, and a gap is formed between the current collecting member 24 and the first weld mark 233.

[0229] The battery cell 20 is also provided with a current collecting member 24, which connects the first terminal portion 231 and the electrode assembly 22 via the current collecting member 24 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23, thereby reducing the difficulty of connecting the electrode assembly 22 and the first terminal portion 231. In addition, by spacing the current collecting member 24 and the first weld mark 233, the current collecting member 24 and the first weld mark 233 do not contact each other in the thickness direction X of the wall portion. This reduces the interference effect of the first weld mark 233 on the current collecting member 24, thereby improving the connection quality between the current collecting member 24 and the first terminal portion 231.

[0230] According to some embodiments of the present application, as shown in Figures 5 and 6, along the thickness direction X of the wall, the first limiting portion 2311 has a first surface 2311a facing the electrode assembly 22, and the first groove 2313 is recessed from the first surface 2311a in a direction away from the electrode assembly 22, and the first surface 2311a is connected to the current collecting component 24.

[0231] Among them, the first surface 2311a is the surface of the first limiting portion 2311 facing the electrode assembly 22 in the thickness direction X of the wall portion, and the first groove 2313 is recessed from the first surface 2311a in the direction away from the electrode assembly 22, that is, the first groove 2313 is arranged on the first surface 2311a of the first limiting portion 2311, and extends along the thickness direction X of the wall portion to the inside of the first protrusion 2312.

[0232] The first surface 2311a is connected to the current collecting member 24, that is, the current collecting member 24 is connected to the side of the first limiting portion 2311 facing the electrode assembly 22. Exemplarily, the current collecting member 24 is welded to the first limiting portion 2311. Of course, in other embodiments, the current collecting member 24 and the first surface 2311a may also abut against each other.

[0233] The first groove 2313 is recessed from the first surface 2311a of the first limiting portion 2311 in a direction away from the electrode assembly 22, so that the current collecting component 24 is connected to the first surface 2311a of the first limiting portion 2311 on which the first groove 2313 is provided, so that the first weld mark 233 formed on the bottom surface of the first groove 2313 can be spaced apart from the current collecting component 24 in the thickness direction X of the wall through the first groove 2313, thereby realizing the spaced arrangement of the current collecting component 24 and the first weld mark 233, so that the current collecting component 24 can not contact the first weld mark 233 in the thickness direction X of the wall, the structure is simple, and the difficulty of connecting the current collecting component 24 and the first terminal portion 231 can be reduced.

[0234] According to some embodiments of the present application, referring to FIG. 7 , which is a partial cross-sectional view of a battery cell 20 provided in yet other embodiments of the present application, a first protrusion 241 is provided on the side of the current collecting member 24 facing away from the electrode assembly 22, along the thickness direction X of the wall. The first protrusion 241 extends into the first groove 2313 and connects to the bottom surface of the first groove 2313. A first avoidance groove 2411 is provided on the end of the first protrusion 241 facing the bottom surface of the first groove 2313 to avoid the first weld mark 233.

[0235] Among them, along the thickness direction X of the wall portion, a first protrusion 241 is protruded from the side of the current collecting member 24 away from the electrode assembly 22, that is, the first protrusion 241 is a structure protruding from the side of the current collecting member 24 away from the electrode assembly 22 toward the direction away from the electrode assembly 22.

[0236] The first protrusion 241 extends into the first groove 2313 and is connected to the bottom surface of the first groove 2313. That is, the first protrusion 241 of the current collecting member 24 is inserted into the first groove 2313 of the first terminal portion 231 and is connected to the bottom surface of the first groove 2313, thereby electrically connecting the current collecting member 24 to the first terminal portion 231. Exemplarily, the first protrusion 241 of the current collecting member 24 is welded to the first terminal portion 231. Of course, in other embodiments, the first protrusion 241 may also abut against the bottom surface of the first groove 2313.

[0237] A first avoidance groove 2411 for avoiding the first weld mark 233 is provided at one end of the first convex portion 241 facing the bottom surface of the first groove 2313, that is, the first avoidance groove 2411 is provided at one end of the first convex portion 241 facing the bottom surface of the first groove 2313 in the thickness direction X of the wall portion, and the first weld mark 233 is accommodated in the first avoidance groove 2411, so that the first weld mark 233 can be spaced apart from the first convex portion 241 of the current collecting component 24 without contacting each other.

[0238] By protruding the first protrusion 241 on the side of the current collecting component 24 away from the electrode assembly 22, the first protrusion 241 can be inserted into the first groove 2313 of the first terminal portion 231 and connected to the bottom surface of the first groove 2313. On the one hand, the current collecting component 24 with this structure can play a certain positioning role through the first protrusion 241 to improve the assembly accuracy between the current collecting component 24 and the first terminal portion 231. On the other hand, the structure in which the first protrusion 241 and the bottom surface of the first groove 2313 are interconnected can reduce the impact of the mutual connection between the current collecting component 24 and the first terminal portion 231 on other components. In addition, by setting a first avoidance groove 2411 for avoiding the first weld mark 233 at one end of the first protrusion 241 facing the bottom surface of the first groove 2313, the first weld mark 233 formed on the bottom surface of the first groove 2313 can be spaced apart from the current collecting component 24 in the thickness direction X of the wall through the first avoidance groove 2411, thereby realizing the spacing between the current collecting component 24 and the first weld mark 233, so that the current collecting component 24 can not contact the first weld mark 233 in the thickness direction X of the wall.

[0239] In some embodiments, please continue to refer to FIG. 7 , along the thickness direction X of the wall, the groove depth of the first avoidance groove 2411 is H1, which satisfies 0.1 mm ≤ H1 ≤ 0.5 mm.

[0240] Illustratively, the groove depth H1 of the first avoidance groove 2411 may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, or 0.5 mm, etc.

[0241] By setting the groove depth of the first avoidance groove 2411 in the thickness direction X of the wall to be greater than or equal to 0.1 mm, the avoidance effect of the first avoidance groove 2411 on the first weld mark 233 can be improved, thereby alleviating the interference effect of the first weld mark 233 on the mutual connection between the first convex portion 241 and the groove bottom surface of the first groove 2313 of the current collecting component 24, which is beneficial to improving the quality of the mutual connection between the first convex portion 241 and the groove bottom surface of the first groove 2313. By setting the groove depth of the first avoidance groove 2411 in the thickness direction X of the wall to be less than or equal to 0.5 mm, the phenomenon of excessive waste of the first avoidance groove 2411 can be reduced. On the one hand, the structural strength of the first convex portion 241 can be improved to improve the connection stability between the first convex portion 241 and the groove bottom surface of the first groove 2313. On the other hand, the processing difficulty of the first avoidance groove 2411 can be reduced to improve the processing efficiency of the current collecting component 24.

[0242] According to some embodiments of the present application, referring to FIG8 , which is a partial cross-sectional view of a battery cell 20 according to yet other embodiments of the present application, a first protrusion 241 is provided on the side of the current collecting member 24 facing away from the electrode assembly 22 along the thickness direction X of the wall. The first protrusion 241 extends into the first groove 2313 and connects to the bottom surface of the first groove 2313. The first weld mark 233 surrounds the outer side of the first protrusion 241.

[0243] Among them, along the thickness direction X of the wall portion, a first protrusion 241 is protruded from the side of the current collecting member 24 away from the electrode assembly 22, that is, the first protrusion 241 is a structure protruding from the side of the current collecting member 24 away from the electrode assembly 22 toward the direction away from the electrode assembly 22.

[0244] The first protrusion 241 extends into the first groove 2313 and is connected to the bottom surface of the first groove 2313. That is, the first protrusion 241 of the current collecting member 24 is inserted into the first groove 2313 of the first terminal portion 231 and is connected to the bottom surface of the first groove 2313, thereby electrically connecting the current collecting member 24 to the first terminal portion 231. Exemplarily, the first protrusion 241 of the current collecting member 24 is welded to the first terminal portion 231. Of course, in other embodiments, the first protrusion 241 may also abut against the bottom surface of the first groove 2313.

[0245] The first weld mark 233 surrounds the outside of the first protrusion 241, that is, the first weld mark 233 is a structure arranged around the first protrusion 241, so that the first protrusion 241 is located on the inner side of the first weld mark 233, so that the first weld mark 233 can be spaced apart from the first protrusion 241 in the radial direction of the first protrusion 241 without contacting each other.

[0246] By providing a first protrusion 241 on the side of the current collecting member 24 facing away from the electrode assembly 22, the first protrusion 241 can be inserted into the first groove 2313 of the first terminal portion 231 and connected to the bottom surface of the first groove 2313. This structure of the current collecting member 24 allows the first protrusion 241 to provide a certain positioning effect, thereby improving the assembly accuracy between the current collecting member 24 and the first terminal portion 231. Furthermore, the interconnection between the first protrusion 241 and the bottom surface of the first groove 2313 can reduce the impact of the connection between the current collecting member 24 and the first terminal portion 231 on other components. Furthermore, by configuring the first weld mark 233 to surround the outside of the first protrusion 241, the first weld mark 233 formed on the bottom surface of the first groove 2313 can be spaced apart from the current collecting member 24, thereby ensuring that the current collecting member 24 and the first weld mark 233 do not contact each other in the thickness direction X of the wall.

[0247] In some embodiments, as shown in FIG. 7 and FIG. 8 , along the thickness direction X of the wall portion, a second groove 242 is formed on a side of the current collecting member 24 facing the electrode assembly 22 and corresponding to a position of the first protrusion 241 .

[0248] Exemplarily, the first protrusion 241 provided on one side of the current collecting member 24 is formed by a stamping process, so that the first protrusion 241 is formed on one side of the current collecting member 24, and the second groove 242 is formed on the side of the current collecting member 24 away from the first protrusion 241 and at a position corresponding to the first protrusion 241. Of course, the processing method for forming the first protrusion 241 on one side of the current collecting member 24 is not limited to this. In other embodiments, the first protrusion 241 provided on one side of the current collecting member 24 can also be formed by a processing process such as casting or milling.

[0249] By forming a second groove 242 on the side of the current collecting component 24 facing the electrode assembly 22 and in the area corresponding to the first protrusion 241, the current collecting component 24 is a structure that can be formed by stamping, so that the first protrusion 241 and the second groove 242 are respectively formed on both sides of the current collecting component 24, which is conducive to reducing the manufacturing difficulty of the current collecting component 24.

[0250] According to some embodiments of the present application, referring to Figures 9 and 10, Figure 9 is a partial cross-sectional view of a battery cell 20 provided in still further embodiments of the present application, and Figure 10 is a cross-sectional view of an electrode terminal 23 of a battery cell 20 provided in still further embodiments of the present application. The second terminal portion 232 may include a second stopper 2321 and a second protrusion 2322. Along the thickness direction X of the wall portion, the second stopper 2321 is located on the side of the wall portion 211 facing away from the electrode assembly 22. The second stopper 2321 is configured to cooperate with the first terminal portion 231 to clamp the wall portion 211. The second protrusion 2322 is provided protrudingly on the side of the second stopper 2321 facing the electrode assembly 22. The second protrusion 2322 is provided along the thickness direction X of the wall portion to penetrate into the mounting hole 2111 and connect to the first terminal portion 231.

[0251] Among them, the second limiting portion 2321 is located on the side of the wall portion 211 away from the electrode assembly 22, that is, the second limiting portion 2321 of the second terminal portion 232 is located on the side of the wall portion 211 away from the inside of the shell 21, so that the second limiting portion 2321 is located outside the shell 21.

[0252] The second protrusion 2322 is protruded from the side of the second limiting portion 2321 facing the electrode assembly 22 , that is, the second protrusion 2322 is a structure extending and protruding from the side of the second limiting portion 2321 facing the electrode assembly 22 toward the electrode assembly 22 .

[0253] The second protrusion 2322 passes through the mounting hole 2111 along the thickness direction X of the wall portion and is connected to the first terminal portion 231 . That is, the second protrusion 2322 is inserted into the mounting hole 2111 of the wall portion 211 and is connected to the first terminal portion 231 .

[0254] It should be noted that, in an embodiment in which a second protrusion 2322 is formed on the second terminal portion 232 and the second protrusion 2322 is passed through the mounting hole 2111, the first terminal portion 231 can be a structure that is entirely located on the side of the wall portion 211 facing the electrode assembly 22. For example, the first terminal portion 231 is a plate-like structure. Of course, the first terminal portion 231 can also be a structure including a first limiting portion 2311 and a first protrusion 2312, and the first protrusion 2312 and the second protrusion 2322 are connected to each other.

[0255] The second terminal portion 232 is provided with a second limiting portion 2321 and a second protrusion 2322. The second limiting portion 2321 is located on the side of the wall portion 211 away from the electrode assembly 22, so that the second limiting portion 2321 can cooperate with the first terminal portion 231 to clamp the wall portion 211, and the second protrusion 2322 is protruded on the side of the second limiting portion 2321 facing the electrode assembly 22, and is passed through the mounting hole 2111, so that the second terminal portion 232 can be connected to the first terminal portion 231 through the second protrusion 2322 passed through the mounting hole 2111, so that the first terminal portion 231 and the second terminal portion 232 are arranged and connected along the thickness direction X of the wall portion, which is conducive to reducing the difficulty of connecting the first terminal portion 231 and the second terminal portion 232.

[0256] In some embodiments, as shown in FIG. 9 and FIG. 10 , along the thickness direction X of the wall portion, the first terminal portion 231 is entirely located on a side of the wall portion 211 facing the electrode assembly 22 .

[0257] Among them, the first terminal portion 231 is located as a whole on the side of the wall portion 211 facing the electrode assembly 22, that is, the first terminal portion 231 does not extend into the mounting hole 2111 of the wall portion 211, and the first terminal portion 231 is located as a whole inside the outer shell 21. For example, in Figure 10, the first terminal portion 231 is a plate-like structure.

[0258] By setting the first terminal portion 231 as a structure that is located as a whole on the side of the wall portion 211 facing the electrode assembly 22, it is convenient to assemble the first terminal portion 231, and there is no need to set a protruding structure on the first terminal portion 231 to be inserted into the mounting hole 2111, which is beneficial to reducing the processing difficulty of the first terminal portion 231.

[0259] According to some embodiments of the present application, please continue to refer to Figures 9 and 10. Along the thickness direction X of the wall, the first terminal portion 231 has a second surface 2314 facing away from the electrode assembly 22, and the second surface 2314 is connected to the second protrusion 2322.

[0260] Among them, the second surface 2314 is the surface of the first terminal portion 231 on the side away from the electrode assembly 22 in the thickness direction X of the wall portion, and the second surface 2314 is connected to the second protrusion 2322, that is, the second protrusion 2322 is directly connected to the surface of the first terminal portion 231 of the plate-like structure on the side away from the electrode assembly 22.

[0261] By connecting the second surface 2314 of the first terminal portion 231 facing away from the electrode assembly 22 with the second protrusion 2322, the second protrusion 2322 is made into a structure that is interconnected with the surface of the first terminal portion 231 facing away from the electrode assembly 22. The structure is simple and easy to assemble, and there is no need to provide a protrusion structure on the first terminal portion 231 to be inserted into the mounting hole 2111, which is beneficial to reducing the processing difficulty of the first terminal portion 231.

[0262] In some embodiments, as shown in FIG. 10 , the second surface 2314 is a continuously arranged plane and is perpendicular to the thickness direction X of the wall portion.

[0263] The second surface 2314 is a continuously arranged plane, that is, the second surface 2314 is a complete and continuously arranged plane, and no protrusion or groove structure is arranged on the second surface 2314 .

[0264] By setting the second surface 2314 as a planar structure that is perpendicular to and continuously arranged in the thickness direction X of the wall portion, the second protrusion 2322 of the second terminal portion 232 is facilitated to connect with the first terminal portion 231, and it is beneficial to improve the connection quality between the second terminal portion 232 and the first terminal portion 231.

[0265] It should be noted that, in an embodiment where the first terminal portion 231 is a plate-like structure, the electrode tab 221 of the electrode assembly 22 may be directly connected to the side of the first terminal portion 231 facing the electrode assembly 22. For example, the electrode assembly 22 has a tab 221, and along the thickness direction X of the wall portion, the tab 221 is connected to the side of the first terminal portion 231 facing the electrode assembly 22 to electrically connect the electrode assembly 22 and the first terminal portion 231.

[0266] For example, the tab 221 and the first terminal portion 231 may be directly welded or directly abutted.

[0267] Since the second surface 2314 of the first terminal portion 231 facing away from the electrode assembly 22 is a plane, the first terminal portion 231 can be set as a plate-like structure, so that the pole ear 221 of the electrode assembly 22 can be directly connected to the side of the first terminal portion 231 facing the electrode assembly 22, without the need to set the current collecting component 24, which is conducive to optimizing the production process and production rhythm of the battery cell 20, thereby improving the production efficiency of the battery cell 20 and reducing the production cost of the battery cell 20.

[0268] According to some embodiments of the present application, as shown in Figures 9 and 10, along the thickness direction X of the wall portion, the first terminal portion 231 has a third surface 2315 facing the electrode assembly 22, and the third surface 2315 is provided with a third groove 2315a. The second protrusion 2322 is welded to the second surface 2314 to form a first weld mark 233, and at least a portion of the first weld mark 233 is formed on the bottom surface of the third groove 2315a.

[0269] The third surface 2315 is a surface of the first terminal portion 231 of the plate-like structure facing the electrode assembly 22 in the thickness direction X of the wall portion.

[0270] The second protrusion 2322 is welded to the second surface 2314 to form a first weld mark 233, that is, the second protrusion 2322 of the second terminal portion 232 and the first terminal portion 231 are structures connected to each other by welding, and a first weld mark 233 is formed between the second protrusion 2322 of the second terminal portion 232 and the first terminal portion 231.

[0271] At least part of the first weld mark 233 is formed on the bottom surface of the third groove 2315a, that is, the first weld mark 233 formed by the second protrusion 2322 of the second terminal portion 232 and the first terminal portion 231 welding each other extends to the bottom surface of the third groove 2315a, that is, the second protrusion 2322 of the second terminal portion 232 and the first terminal portion 231 are a structure that is welded from one side of the bottom surface of the third groove 2315a.

[0272] For example, the second protrusion 2322 of the second terminal portion 232 and the first terminal portion 231 may be welded to each other by a welding process such as laser welding or ultrasonic welding.

[0273] The third groove 2315a is provided on the third surface 2315 of the first terminal portion 231 facing the electrode assembly 22, and at least a portion of the first weld mark 233 formed by welding the second protrusion 2322 and the second surface 2314 to each other is formed on the bottom surface of the third groove 2315a, so that the first weld mark 233 is a structure extending into the third groove 2315a. The battery cell 20 with this structure can be connected to the second protrusion 2322 and the second surface 2314 of the first terminal portion 231 from the side where the third groove 2315a is provided. 314 is welded and assembled so that the first terminal part 231 and the second terminal part 232 are welded together from the side of the first terminal part 231 where the third groove 2315a is formed and the thinned area is formed, and there is no need to penetrate the second limiting part 2321 and the second protrusion 2322 from the side of the second terminal part 232 away from the electrode assembly 22 and then weld together with the first terminal part 231, thereby reducing the difficulty of welding the first terminal part 231 and the second terminal part 232 to each other and the power required for the welding connection.

[0274] According to some embodiments of the present application, as shown in Figures 9 and 10, the battery cell 20 may further include a current collecting member 24. The current collecting member 24 is disposed between the wall portion 211 and the electrode assembly 22. The current collecting member 24 connects the first terminal portion 231 and the electrode assembly 22 to electrically connect the first terminal portion 231 and the electrode assembly 22. Along the thickness direction X of the wall portion, the current collecting member 24 is connected to the third surface 2315 and is spaced apart from the bottom surface of the third groove 2315a.

[0275] The current collecting member 24 connects the first terminal portion 231 of the electrode terminal 23 to the tab 221 of the electrode assembly 22, thereby achieving electrical connection between the electrode assembly 22 and the electrode terminal 23. The current collecting member 24 can be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloy.

[0276] The current collecting member 24 is connected to the third surface 2315, and the current collecting member 24 is spaced apart from the bottom surface of the third groove 2315a. That is, the current collecting member 24 is connected to the surface of the first terminal portion 231 facing the electrode assembly 22, so that the current collecting member 24 and the first weld mark 233 formed on the bottom surface of the third groove 2315a are spaced apart in the thickness direction X of the wall through the third groove 2315a and do not contact each other.

[0277] The battery cell 20 is also provided with a current collecting member 24 , which connects the first terminal portion 231 and the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23 , thereby reducing the difficulty of connecting the electrode assembly 22 and the first terminal portion 231 . In addition, by connecting the current collecting component 24 to the third surface 2315 of the first terminal on which the third groove 2315a is provided, the first weld mark 233 formed on the bottom surface of the third groove 2315a can be spaced apart from the current collecting component 24 in the thickness direction X of the wall through the third groove 2315a, so that the third groove 2315a can also play a role in avoiding the first weld mark 233 for the current collecting component 24, thereby enabling the current collecting component 24 and the first weld mark 233 to be spaced apart in the thickness direction X of the wall, so that the current collecting component 24 can not contact the first weld mark 233 in the thickness direction X of the wall, thereby reducing the interference effect of the first weld mark 233 on the current collecting component 24, which is beneficial to improving the connection quality between the current collecting component 24 and the first terminal portion 231.

[0278] In some embodiments, as shown in FIG. 10 , along the thickness direction X of the wall portion, the depth of the third groove 2315 a is H2 , satisfying 0.1 mm ≤ H2 ≤ 0.5 mm.

[0279] Illustratively, the groove depth H2 of the third groove 2315a can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm or 0.5 mm, etc.

[0280] By setting the groove depth of the third groove 2315a in the thickness direction X of the wall to be greater than or equal to 0.1 mm, the avoidance effect of the third groove 2315a on the first weld mark 233 can be improved, thereby alleviating the interference effect of the first weld mark 233 on the mutual connection between the current collecting component 24 and the third surface 2315 of the first terminal portion 231, which is beneficial to improving the connection quality between the current collecting component 24 and the first terminal portion 231. By setting the groove depth of the third groove 2315a in the thickness direction X of the wall to be less than or equal to 0.5 mm, the phenomenon of excessive waste of the third groove 2315a can be reduced. On the one hand, the overall structural strength of the first terminal portion 231 can be improved, and on the other hand, the processing difficulty of the third groove 2315a can be reduced, thereby improving the processing efficiency of the first terminal portion 231.

[0281] According to some embodiments of the present application, referring to Figures 11 and 12, Figure 11 is a partial cross-sectional view of a battery cell 20 provided in other embodiments of the present application, and Figure 12 is a cross-sectional view of an electrode terminal 23 of a battery cell 20 provided in other embodiments of the present application. Along the thickness direction X of the wall portion, the first terminal portion 231 has a second surface 2314 facing away from the electrode assembly 22. The second surface 2314 is provided with a fourth groove 2314a. The second protrusion 2322 is inserted into the fourth groove 2314a and connected to the bottom surface of the fourth groove 2314a.

[0282] The second surface 2314 is a surface of the first terminal portion 231 that is away from the electrode assembly 22 in the thickness direction X of the wall portion.

[0283] The second protrusion 2322 is inserted into the fourth groove 2314a and connected to the bottom surface of the fourth groove 2314a, that is, the second protrusion 2322 of the second terminal portion 232 extends into the fourth groove 2314a of the first terminal portion 231 and is connected to the bottom surface of the fourth groove 2314a.

[0284] By arranging a fourth groove 2314a on the second surface 2314 of the first terminal portion 231 away from the electrode assembly 22, and the second protrusion 2322 is inserted into the fourth groove 2314a and interconnected with the bottom surface of the fourth groove 2314a, this structure can play a certain positioning role in the mutual assembly of the first terminal portion 231 and the second terminal portion 232, which is beneficial to improving the assembly accuracy between the first terminal portion 231 and the second terminal portion 232, and can reduce the difficulty of assembly between the first terminal portion 231 and the second terminal portion 232.

[0285] According to some embodiments of the present application, please continue to refer to Figures 11 and 12, the second protrusion 2322 is welded to the bottom surface of the fourth groove 2314a to form a first weld mark 233, and the first weld mark 233 extends to the side of the first terminal portion 231 facing the electrode assembly 22.

[0286] Among them, the second protrusion 2322 is welded to the bottom surface of the fourth groove 2314a to form a first weld mark 233, that is, the second protrusion 2322 of the second terminal part 232 and the bottom surface of the fourth groove 2314a of the first terminal part 231 are structures connected to each other by welding, and a first weld mark 233 is formed between the second protrusion 2322 of the second terminal part 232 and the first terminal part 231.

[0287] The first weld mark 233 extends to the side of the first terminal portion 231 facing the electrode assembly 22, that is, the first weld mark 233 formed by welding the second protrusion 2322 of the second terminal portion 232 and the bottom surface of the fourth groove 2314a to each other extends to the side of the first terminal portion 231 facing the electrode assembly 22 in the thickness direction X of the wall portion, that is, the second protrusion 2322 of the second terminal portion 232 and the first terminal portion 231 are a structure that is welded from the side of the first terminal portion 231 facing the electrode assembly 22.

[0288] For example, the second protrusion 2322 of the second terminal portion 232 and the bottom surface of the fourth groove 2314 a of the first terminal portion 231 may be welded to each other by a welding process such as laser welding or ultrasonic welding.

[0289] The second protrusion 2322 and the bottom surface of the fourth groove 2314a are welded together, and the first weld mark 233 formed by the welding connection between the second protrusion 2322 and the bottom surface of the fourth groove 2314a extends to the side of the first terminal part 231 facing the electrode assembly 22. The battery cell 20 adopting this structure can weld and assemble the second protrusion 2322 and the bottom surface of the fourth groove 2314a from the side of the first terminal part 231 facing the electrode assembly 22, thereby eliminating the need to penetrate the second limiting part 2321 and the second protrusion 2322 from the side of the second terminal part 232 away from the electrode assembly 22 and then weld them to the first terminal part 231, which is beneficial to reducing the difficulty of welding the first terminal part 231 and the second terminal part 232 to each other and the power required for the welding connection.

[0290] According to some embodiments of the present application, as shown in Figures 11 and 12, the battery cell 20 may further include a current collecting member 24. The current collecting member 24 is disposed between the wall portion 211 and the electrode assembly 22. The current collecting member 24 connects the first terminal portion 231 and the electrode assembly 22 to electrically connect the first terminal portion 231 and the electrode assembly 22. Along the thickness direction X of the wall portion, the first terminal portion 231 has a third surface 2315 facing the electrode assembly 22. The current collecting member 24 is connected to the third surface 2315. A second avoidance groove 243 for avoiding the first weld mark 233 is provided on the side of the current collecting member 24 facing away from the electrode assembly 22.

[0291] The current collecting member 24 connects the first terminal portion 231 of the electrode terminal 23 to the tab 221 of the electrode assembly 22, thereby achieving electrical connection between the electrode assembly 22 and the electrode terminal 23. The current collecting member 24 can be made of various materials, such as copper, iron, aluminum, steel, and aluminum alloy.

[0292] The current collecting member 24 is connected to the third surface 2315 , that is, the current collecting member 24 is connected to the surface of the first terminal portion 231 on the side facing the electrode assembly 22 .

[0293] A second avoidance groove 243 for avoiding the first weld mark 233 is provided on the side of the current collecting component 24 facing away from the electrode assembly 22, that is, a second avoidance groove 243 is provided on the side of the current collecting component 24 facing away from the electrode assembly 22 in the thickness direction X of the wall, and the first weld mark 233 is accommodated in the second avoidance groove 243, so that the first weld mark 233 can be spaced apart from the current collecting component 24 and do not contact each other.

[0294] The current collecting member 24 connects the first terminal portion 231 and the electrode assembly 22 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23, thereby reducing the difficulty of connecting the electrode assembly 22 and the first terminal portion 231. Furthermore, by connecting the current collecting member 24 to the third surface 2315 of the first terminal portion 231 facing the electrode assembly 22 and providing a second avoidance groove 243 on the side of the current collecting member 24 facing away from the electrode assembly 22 for avoiding the first weld mark 233, the first weld mark 233 formed on the side of the first terminal portion 231 facing the electrode assembly 22 can be spaced apart from the current collecting member 24 in the thickness direction X of the wall portion via the second avoidance groove 243. This ensures that the current collecting member 24 and the first weld mark 233 do not contact each other in the thickness direction X of the wall portion, thereby reducing the interference of the first weld mark 233 on the current collecting member 24 and improving the connection quality between the current collecting member 24 and the third surface 2315 of the first terminal portion 231.

[0295] According to some embodiments of the present application, as shown in Figures 11 and 12 , a third protrusion 2315b is provided on the third surface 2315, and the first weld mark 233 extends to the end of the third protrusion 2315b facing the electrode assembly 22. Along the thickness direction X of the wall portion, the third protrusion 2315b is inserted into the second avoidance groove 243, and the third protrusion 2315b is spaced apart from the bottom surface of the second avoidance groove 243.

[0296] Among them, the third surface 2315 is protruded with a third protrusion 2315b, that is, the third protrusion 2315b is formed on the third surface 2315 of the first terminal portion 231 facing the electrode assembly 22, that is, the third protrusion 2315b is a structure protruding from the third surface 2315 of the first terminal portion 231 toward the direction close to the electrode assembly 22.

[0297] Optionally, the third protrusion 2315b is arranged corresponding to the fourth groove 2314a of the first terminal portion 231 in the thickness direction X of the wall portion, so that the first terminal portion 231 can be a structure formed by a stamping process to form a fourth groove 2314a on the second surface 2314 of the first terminal portion 231 away from the electrode assembly 22, and form a third protrusion 2315b on the third surface 2315 of the first terminal portion 231 facing the electrode assembly 22.

[0298] It should be noted that in an embodiment in which a third protrusion 2315b is formed on the third surface 2315 of the first terminal portion 231 facing the electrode assembly 22, the first weld mark 233 formed by welding the bottom surface of the fourth groove 2314a of the first terminal portion 231 to the second protrusion 2322 of the second terminal portion 232 extends to the side of the third protrusion 2315b facing the electrode assembly 22, so that the first terminal portion 231 and the second terminal portion 232 are a structure that is welded and connected from the side of the third protrusion 2315b facing the electrode assembly 22.

[0299] The third protrusion 2315b is inserted into the second avoidance groove 243, and the third protrusion 2315b is spaced apart from the bottom surface of the second avoidance groove 243. That is, the third protrusion 2315b of the first terminal portion 231 extends into the second avoidance groove 243 of the current collecting component 24 in the thickness direction X of the wall portion, and is spaced apart from the bottom surface of the second avoidance groove 243, so that the first weld mark 233 extending to the side of the third protrusion 2315b facing the electrode assembly 22 can be spaced apart from the current collecting component 24 in the thickness direction X of the wall portion without contacting each other.

[0300] By protruding a third protrusion 2315b on the third surface 2315 of the first terminal portion 231 and inserting it into the second avoidance groove 243 of the current collecting component 24, and the third protrusion 2315b and the groove bottom surface of the second avoidance groove 243 are spaced apart in the thickness direction X of the wall portion, so that the first weld mark 233 extending to the third protrusion 2315b and the current collecting component 24 are spaced apart in the thickness direction X of the wall portion, the third protrusion 2315b and the second avoidance groove 243 can play a certain positioning role on the current collecting component 24 and the first terminal portion 231 through the cooperation, which is beneficial to improving the assembly accuracy between the current collecting component 24 and the first terminal portion 231.

[0301] In some embodiments, as shown in FIG. 11 , along the thickness direction X of the wall portion, the distance between the third protrusion 2315 b and the bottom surface of the second avoidance groove 243 is H3, satisfying 0.1 mm ≤ H3 ≤ 0.5 mm.

[0302] Exemplarily, the distance H3 between the third protrusion 2315b and the bottom surface of the second avoidance groove 243 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm or 0.5mm, etc.

[0303] By setting the interval between the third protrusion 2315b and the bottom surface of the second avoidance groove 243 to be greater than or equal to 0.1 mm, the avoidance effect of the second avoidance groove 243 on the first weld mark 233 can be improved, thereby alleviating the interference effect of the first weld mark 233 on the mutual connection between the current collecting component 24 and the first terminal part 231, which is beneficial to improving the connection quality between the current collecting component 24 and the first terminal part 231. By setting the interval between the third protrusion 2315b and the bottom surface of the second avoidance groove 243 to be less than or equal to 0.5 mm, the space occupied by the current collecting component 24 and the first terminal part 231 in the thickness direction X of the wall can be optimized, and the phenomenon of excessive waste of the second avoidance groove 243 can be reduced. On the one hand, the structural strength of the current collecting component 24 can be improved, and on the other hand, the processing difficulty of the second avoidance groove 243 can be reduced, thereby improving the processing efficiency of the current collecting component 24.

[0304] According to some embodiments of the present application, please continue to refer to FIG. 11 , along the thickness direction X of the wall, a second protrusion 244 is formed on the side of the current collecting member 24 facing the electrode assembly 22 and corresponding to the position of the second avoidance groove 243 .

[0305] Exemplarily, the second avoidance groove 243 provided on one side of the current collecting member 24 is formed by a stamping process, so that the second avoidance groove 243 is formed on one side of the current collecting member 24, and a second protrusion 244 is formed at a position of the current collecting member 24 away from the second avoidance groove 243 and corresponding to the second avoidance groove 243. Of course, the processing method for forming the second avoidance groove 243 on one side of the current collecting member 24 is not limited to this. In other embodiments, the second avoidance groove 243 provided on one side of the current collecting member 24 can also be formed by laser etching, engraving, or casting.

[0306] By forming a second protrusion 244 on the side of the current collecting component 24 facing the electrode assembly 22 and in the area corresponding to the second avoidance groove 243, the current collecting component 24 is a structure that can be formed by stamping, so that the second avoidance groove 243 and the second protrusion 244 are respectively formed on both sides of the current collecting component 24, which is conducive to reducing the manufacturing difficulty of the current collecting component 24.

[0307] According to some embodiments of the present application, referring to FIG. 6 , FIG. 10 and FIG. 12 , the first terminal portion 231 and the second terminal portion 232 are welded together.

[0308] The first terminal portion 231 and the second terminal portion 232 are welded to each other to form a first weld mark 233 , and the first weld mark 233 passes through the contact surface between the first terminal portion 231 and the second terminal portion 232 .

[0309] Optionally, the first terminal portion 231 and the second terminal portion 232 may be welded to each other by a welding process such as laser welding or ultrasonic welding.

[0310] By configuring the first terminal portion 231 and the second terminal portion 232 to be welded to each other, the connection strength between the first terminal portion 231 and the second terminal portion 232 is improved, thereby improving the structural stability of the electrode terminal 23 when assembled on the wall portion 211. In addition, the structure of connecting the first terminal portion 231 and the second terminal portion 232 by welding can replace the structure of assembling the electrode terminal 23 on the wall portion 211 through a riveting process, thereby increasing the radial dimensions of the first terminal portion 231 and the second terminal portion 232 that are separately provided according to actual needs, which is beneficial to improving the structural strength of the first terminal portion 231 and the second terminal portion 232.

[0311] According to some embodiments of the present application, as shown in Figures 5, 9, and 11, the first terminal portion 231 has a first limiting portion 2311. The first limiting portion 2311 is located on the side of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion. The first limiting portion 2311 is configured to cooperate with the second terminal portion 232 to clamp the wall portion 211 to limit the electrode terminal 23 from separating from the wall portion 211 along the thickness direction X of the wall portion. The battery cell 20 may further include a current collecting member 24, which is disposed between the wall portion 211 and the electrode assembly 22 and connects the electrode assembly 22 and the first limiting portion 2311.

[0312] Among them, the first limiting portion 2311 is located on the side of the wall portion 211 facing the electrode assembly 22, that is, the first limiting portion 2311 overlaps with at least part of the wall portion 211 in the thickness direction X of the wall portion, so that the first limiting portion 2311 and the second terminal portion 232 can cooperate to clamp the wall portion 211 to assemble the electrode terminal 23 to the wall portion 211.

[0313] The current collecting member 24 connects the electrode assembly 22 and the first limiting portion 2311, that is, at least a portion of the current collecting member 24 is located between the first limiting portion 2311 and the electrode assembly 22, and the current collecting member 24 electrically connects the electrode terminal 23 and the electrode assembly 22 by connecting the first limiting portion 2311 and the electrode assembly 22. For example, the current collecting member 24 and the first limiting portion 2311 can be welded or abutted.

[0314] The first terminal portion 231 is provided with a first limiting portion 2311, and the first limiting portion 2311 is located on the side of the wall portion 211 facing the electrode assembly 22, so that the first limiting portion 2311 can cooperate with the second terminal portion 232 to clamp the wall portion 211, and a current collecting component 24 is also provided in the battery cell 20. The first limiting portion 2311 of the first terminal portion 231 and the electrode assembly 22 are connected through the current collecting component 24 to achieve electrical connection between the electrode assembly 22 and the electrode terminal 23. This structure can reduce the difficulty of electrical connection between the electrode assembly 22 and the electrode terminal 23 on the one hand, and can reduce the difficulty of assembly between the current collecting component 24 and the first terminal portion 231 on the other hand.

[0315] In some embodiments, referring to Figures 5, 9, and 11, the first terminal portion 231 is welded to the second terminal portion 232, and the current collecting member 24 is welded to the first limiting portion 2311. Along the thickness direction X of the wall portion, the thickness of the first limiting portion 2311 is greater than the thickness of the region where the first terminal portion 231 and the second terminal portion 232 are welded.

[0316] Among them, the thickness of the first limiting portion 2311 is greater than the thickness of the area where the first terminal portion 231 and the second terminal portion 232 are welded together, that is, the thickness of the first limiting portion 2311 in the thickness direction X of the wall portion is greater than the thickness of the part of the first terminal portion 231 used for welding connection with the second terminal portion 232 in the thickness direction X of the wall portion.

[0317] Since the first limiting portion 2311 is located on the side of the wall portion 211 facing the electrode assembly 22, the thickness of the first limiting portion 2311 is set to be greater than the thickness of the area where the first terminal portion 231 and the second terminal portion 232 are welded together, so as to realize a structure in which the first terminal portion 231 is thickened in the area of ​​the first limiting portion 2311, thereby alleviating the phenomenon of welding through the first limiting portion 2311 when the current collecting component 24 and the first limiting portion 2311 are welded together, thereby reducing the impact on the wall portion 211 or other components of the battery cell 20 when the current collecting component 24 and the first limiting portion 2311 are welded together.

[0318] According to some embodiments of the present application, as shown in Figures 5, 9, and 11, the current collecting member 24 is welded to the first stopper 2311, forming a second weld mark 28. The battery cell 20 may further include a seal 27 disposed between the wall portion 211 and the electrode terminal 23, with at least a portion of the seal 27 located within the mounting hole 2111 to seal the gap between the electrode terminal 23 and the wall surface of the mounting hole 2111. Along the thickness direction X of the wall portion, the seal 27 has an abutment surface 271, which abuts against the side of the first stopper 2311 facing away from the electrode assembly 22. The projection of the second weld mark 28 in the thickness direction X of the wall portion does not overlap with the abutment surface 271.

[0319] Among them, the current collecting component 24 is welded to the first limiting portion 2311 and forms a second weld mark 28, that is, the current collecting component 24 and the first limiting portion 2311 are connected by welding, and a second weld mark 28 is formed between the current collecting component 24 and the first limiting portion 2311.

[0320] Illustratively, the second weld mark 28 extends along the thickness direction X of the wall portion to the side of the current collecting member 24 facing the electrode assembly 22 , so that the current collecting member 24 and the first limiting portion 2311 are welded together from the side of the current collecting member 24 facing the electrode assembly 22 .

[0321] The sealant 27 serves to seal the gap between the electrode terminal 23 and the wall surface of the mounting hole 2111 of the wall portion 211. The sealant 27 is arranged between the wall portion 211 and the electrode terminal 23, and at least part of the sealant 27 is located in the mounting hole 2111, so that the sealant 27 can seal the electrode terminal 23 and the wall surface of the mounting hole 2111 of the wall portion 211.

[0322] The sealing member 27 has a resting surface 271, which rests against the side of the first limiting portion 2311 away from the electrode assembly 22, that is, the sealing member 27 rests against the side of the first limiting portion 2311 away from the electrode assembly 22 along the thickness direction X of the wall, and the surface of the sealing member 27 resting against the first limiting portion 2311 is the resting surface 271.

[0323] The projection of the second weld mark 28 in the thickness direction X of the wall portion does not overlap with the abutment surface 271, that is, the second weld mark 28 formed by welding the current collecting component 24 to the first limiting portion 2311 and the abutment surface 271 of the sealing member 27 against the second limiting portion 2321 do not overlap in the thickness direction X of the wall portion, that is, the first weld mark 233 and the abutment surface 271 are structures that are staggered in the thickness direction X of the wall portion.

[0324] For example, in Figures 5, 9 and 11, the seal 27 includes a first part, a second part and a third part connected in sequence, the first part is located between the second limiting portion 2321 of the second terminal portion 232 and the wall portion 211 along the thickness direction X of the wall portion, the second part is located between the hole wall surface of the mounting hole 2111 and the electrode terminal 23, and the third part is located between the first limiting portion 2311 of the first terminal portion 231 and the wall portion 211 along the thickness direction X of the wall portion, so that the seal 27 forms a "C" shape structure, wherein the third part abuts against the side of the first limiting portion 2311 away from the electrode assembly 22, so that the surface of the third part facing the electrode assembly 22 is the abutting surface 271.

[0325] Of course, in other embodiments, the seal 27 may also have other structures. Referring to FIG13 , which is a partial cross-sectional view of a battery cell 20 provided in yet another embodiment of the present application, the seal 27 only includes a first portion and a second portion connected in sequence. The first portion is located between the second limiting portion 2321 of the second terminal portion 232 and the wall portion 211 along the thickness direction X of the wall portion, and the second portion is located between the hole wall surface of the mounting hole 2111 and the electrode terminal 23, so that the seal 27 forms an "L"-shaped structure. The second portion abuts against the side of the first limiting portion 2311 facing away from the electrode assembly 22, so that the end surface of the second portion facing the electrode assembly 22 serves as the abutting surface 271.

[0326] By setting the second weld mark 28 formed by welding the current collecting component 24 to the first limiting portion 2311 so that its projection in the thickness direction X of the wall does not overlap with the abutment surface 271 of the seal 27, the abutment surface of the second weld mark 28 and the seal 27 against the first limiting portion 2311 is a structure staggered in the thickness direction X of the wall, thereby reducing the impact of the current collecting component 24 and the first limiting portion 2311 on the seal 27 when they are welded to each other, which is beneficial to alleviating the phenomenon of the seal 27 being burned, and further effectively improving the sealing effect of the seal 27 on the electrode terminal 23 and the hole wall of the mounting hole 2111.

[0327] According to some embodiments of the present application, referring to FIG14 , FIG14 is a partial cross-sectional view of a battery cell 20 provided in yet other embodiments of the present application. The current collecting member 24 is welded to the first limiting portion 2311. The battery cell 20 may further include a seal 27, which is disposed between the wall portion 211 and the electrode terminal 23, and at least a portion of the seal 27 is located within the mounting hole 2111 to seal the gap between the electrode terminal 23 and the hole wall surface of the mounting hole 2111. Along the thickness direction X of the wall portion, the seal 27 is spaced apart from the first limiting portion 2311.

[0328] Among them, the current collecting component 24 is welded to the first limiting portion 2311 and forms a second weld mark 28, that is, the current collecting component 24 and the first limiting portion 2311 are connected by welding, and a second weld mark 28 is formed between the current collecting component 24 and the first limiting portion 2311.

[0329] Illustratively, the second weld mark 28 extends along the thickness direction X of the wall portion to the side of the current collecting member 24 facing the electrode assembly 22 , so that the current collecting member 24 and the first limiting portion 2311 are welded together from the side of the current collecting member 24 facing the electrode assembly 22 .

[0330] The sealant 27 serves to seal the gap between the electrode terminal 23 and the wall surface of the mounting hole 2111 of the wall portion 211. The sealant 27 is arranged between the wall portion 211 and the electrode terminal 23, and at least part of the sealant 27 is located in the mounting hole 2111, so that the sealant 27 can seal the electrode terminal 23 and the wall surface of the mounting hole 2111 of the wall portion 211.

[0331] Along the thickness direction X of the wall, the seal 27 and the first limiting portion 2311 are spaced apart, that is, the seal 27 and the first limiting portion 2311 are spaced apart in the thickness direction X of the wall, so that the seal 27 and the first limiting portion 2311 do not contact each other, so that the seal 27 and the first weld mark 233 are spaced apart in the thickness direction X of the wall.

[0332] Illustratively, in FIG14 , the seal 27 includes a first portion and a second portion connected in sequence, the first portion being located between the second limiting portion 2321 of the second terminal portion 232 and the wall portion 211 along the thickness direction X of the wall portion, and the second portion being located between the hole wall surface of the mounting hole 2111 and the electrode terminal 23, so that the seal 27 forms an "L"-shaped structure, wherein the second portion and the second limiting portion 2321 are spaced apart in the thickness direction X of the wall portion.

[0333] By arranging the first limiting portion 2311 and the sealing member 27 at intervals in the thickness direction X of the wall, the impact of the current collecting component 24 and the first limiting portion 2311 on the sealing member 27 when they are welded to each other can be reduced, which is beneficial to alleviate the phenomenon of the sealing member 27 being burned out, and further effectively improves the sealing effect of the sealing member 27 on the electrode terminal 23 and the hole wall of the mounting hole 2111.

[0334] In some embodiments, as shown in FIG14 , the battery cell 20 may further include a first insulating member 25. Along the thickness direction X of the wall portion, at least a portion of the first insulating member 25 is located between the first limiting portion 2311 and the wall portion 211 to insulate and isolate the first limiting portion 2311 from the wall portion 211. The first insulating member 25 extends between the sealing member 27 and the first limiting portion 2311 to separate the sealing member 27 from the first limiting portion 2311.

[0335] In which, at least part of the first insulating member 25 is located between the first limiting portion 2311 and the wall portion 211, that is, the first insulating member 25 extends between the first limiting portion 2311 and the wall portion 211, so that the wall portion 211 and the first limiting portion 2311 are separated by the first insulating member 25, thereby realizing insulation isolation between the wall portion 211 and the first limiting portion 2311.

[0336] The first insulating member 25 extends between the sealing member 27 and the first limiting portion 2311 to separate the sealing member 27 from the first limiting portion 2311. That is, a portion of the first insulating member 25 is located between the first limiting portion 2311 and the first limiting portion 2311 in the thickness direction X of the wall portion, so that the first limiting portion 2311 and the sealing member 27 are respectively located on both sides of the first insulating member 25. Exemplarily, a portion of the first insulating member 25 extends between the first limiting portion 2311 and the second portion of the sealing member 27.

[0337] A first insulating member 25 is also provided in the battery cell 20 for insulating and isolating the first limiting portion 2311 and the wall portion 211 to reduce the risk of short circuit between the first limiting portion 2311 and the wall portion 211, and by setting the first insulating member 25 to extend between the seal 27 and the first limiting portion 2311, the first insulating member 25 can separate the seal 27 and the first limiting portion 2311, so that the seal 27 and the first limiting portion 2311 are respectively located on both sides of the first insulating member 25 in the thickness direction X of the wall, thereby further reducing the impact of the current collecting component 24 and the first limiting portion 2311 on the seal 27 when they are welded to each other, which is conducive to further alleviating the phenomenon of the seal 27 being burned.

[0338] According to some embodiments of the present application, as shown in FIG11 , the current collecting member 24 is welded to the first limiting portion 2311 to form a second weld mark 28. The battery cell 20 may further include a seal 27, which is disposed between the wall portion 211 and the electrode terminal 23, with at least a portion of the seal 27 located within the mounting hole 2111 to seal the gap between the electrode terminal 23 and the wall surface of the mounting hole 2111. Along the thickness direction X of the wall portion, the seal 27 abuts against the side of the first limiting portion 2311 facing away from the electrode assembly 22. Along the thickness direction X of the wall portion, the distance L between the second weld mark 28 and the seal 27 is such that 0.1 mm ≤ L ≤ 1.3 mm is satisfied.

[0339] Exemplarily, the distance L between the second weld mark 28 and the seal 27 can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm or 1.3 mm, etc.

[0340] By setting the spacing between the second weld mark 28 formed by the mutual welding of the first limiting portion 2311 and the current collecting member 24 and the seal 27 in the wall thickness direction X to be greater than or equal to 0.1 mm, the impact of the welding of the current collecting member 24 and the first limiting portion 2311 on the seal 27 is reduced, which helps alleviate the phenomenon of burnout of the seal 27 and effectively improves the sealing effect of the seal 27 between the electrode terminal 23 and the wall surface of the mounting hole 2111. By setting the spacing between the second weld mark 28 formed by the mutual welding of the first limiting portion 2311 and the current collecting member 24 and the seal 27 in the wall thickness direction X to be less than or equal to 1.3 mm, the phenomenon of excessive spacing between the second weld mark 28 and the seal 27 resulting in excessive space occupied by the second weld mark 28 and the seal 27 is reduced, which helps improve the energy density of the battery cell 20 and reduces the difficulty of assembling the seal 27.

[0341] According to some embodiments of the present application, as shown in Figures 6 and 10, the first terminal portion 231 and the second terminal portion 232 do not overlap in a direction perpendicular to the thickness direction X of the wall portion. In other words, in the radial direction of the electrode terminal 23, the first terminal portion 231 and the second terminal portion 232 do not overlap each other.

[0342] By arranging the first terminal portion 231 and the second terminal portion 232 so as not to overlap each other in a direction perpendicular to the thickness direction X of the wall portion, the first terminal portion 231 and the second terminal portion 232 are arranged along the thickness direction X of the wall portion and are not embedded in each other, thereby facilitating the connection of the first terminal portion 231 and the second terminal portion 232, and optimizing the overall weight of the electrode terminal 23 to improve the energy density of the battery cell 20.

[0343] According to some embodiments of the present application, as shown in Figures 5 and 6, the first terminal portion 231 has a first limiting portion 2311, and the second terminal portion 232 has a second limiting portion 2321. Along the thickness direction X of the wall portion, the first limiting portion 2311 is located on the side of the wall portion 211 facing the electrode assembly 22, and the second limiting portion 2321 is located on the side of the wall portion 211 facing away from the electrode assembly 22. The first limiting portion 2311 and the second limiting portion 2321 are configured to cooperate with each other to clamp the wall portion 211.

[0344] Among them, the first limiting portion 2311 is located on the side of the wall portion 211 facing the electrode assembly 22, and the second limiting portion 2321 is located on the side of the wall portion 211 away from the electrode assembly 22. That is, the first limiting portion 2311 and the second limiting portion 2321 are respectively located on both sides of the wall portion 211 in the thickness direction X of the wall portion, and the first limiting portion 2311 and the second limiting portion 2321 overlap with at least part of the wall portion 211, so that the first limiting portion 2311 and the second limiting portion 2321 can cooperate to clamp the wall portion 211 to assemble the electrode terminal 23 to the wall portion 211.

[0345] It should be noted that, referring to Figures 9 and 11, in the embodiment where the first terminal portion 231 is located as a whole on the side of the wall portion 211 facing the electrode assembly 22, the first terminal portion 231 is located on the side of the wall portion 211 facing the electrode assembly 22 and the area overlapping with the wall portion 211 is the first limiting portion 2311.

[0346] The first terminal portion 231 has a first limiting portion 2311 located on the side of the wall portion 211 facing the electrode assembly 22, and the second terminal portion 232 has a second limiting portion 2321 located on the side of the wall portion 211 away from the electrode assembly 22, so that at least a portion of the wall portion 211 is located between the first limiting portion 2311 and the second limiting portion 2321, so that the first limiting portion 2311 and the second limiting portion 2321 can cooperate with the clamping wall portion 211. Therefore, through this structure, the first terminal portion 231 and the second terminal portion 232 can cooperate with the clamping wall portion 211 to limit the electrode terminal 23 from detaching from the wall portion 211 along the thickness direction X of the wall portion. The structure is simple and easy to assemble.

[0347] According to some embodiments of the present application, as shown in Figures 5, 9, and 11, the battery cell 20 may further include a first insulating member 25. Along the thickness direction X of the wall portion, at least a portion of the first insulating member 25 is located between the first limiting portion 2311 and the wall portion 211 to insulate and isolate the first limiting portion 2311 from the wall portion 211.

[0348] In which, at least part of the first insulating member 25 is located between the first limiting portion 2311 and the wall portion 211, that is, the first insulating member 25 extends between the first limiting portion 2311 and the wall portion 211, so that the first limiting portion 2311 and the wall portion 211 are insulated and isolated by the first insulating member 25.

[0349] The battery cell 20 is also provided with a first insulating member 25, and at least part of the first insulating member 25 is located between the first limiting portion 2311 and the wall portion 211, so that the first insulating member 25 can play the role of insulating and isolating the first limiting portion 2311 and the wall portion 211, thereby reducing the risk of short circuit between the first limiting portion 2311 and the wall portion 211, which is beneficial to improving the reliability of the battery cell 20.

[0350] According to some embodiments of the present application, as shown in Figures 5, 9, and 11, the battery cell 20 may further include a second insulating member 26. Along the thickness direction X of the wall portion, at least a portion of the second insulating member 26 is located between the second limiting portion 2321 and the wall portion 211 to insulate and isolate the second limiting portion 2321 from the wall portion 211.

[0351] Among them, at least part of the second insulating member 26 is located between the second limiting portion 2321 and the wall portion 211, that is, the second insulating member 26 extends between the second limiting portion 2321 and the wall portion 211, so that the second limiting portion 2321 and the wall portion 211 are insulated and isolated by the second insulating member 26.

[0352] The battery cell 20 is also provided with a second insulating member 26, and at least part of the second insulating member 26 is located between the second limiting portion 2321 and the wall portion 211, so that the second insulating member 26 can play the role of insulating and isolating the second limiting portion 2321 and the wall portion 211, thereby reducing the risk of short circuit between the second limiting portion 2321 and the wall portion 211, which is beneficial to improving the reliability of the battery cell 20.

[0353] In some embodiments, referring to Figures 4, 5, 7, 9 and 11, a receiving groove 2112 is provided on the side of the wall portion 211 facing away from the electrode assembly 22 along the thickness direction X of the wall portion, the mounting hole 2111 is provided on the bottom surface of the receiving groove 2112, and at least a portion of the second insulating member 26 is accommodated in the receiving groove 2112.

[0354] Illustratively, a portion of the second insulating member 26 is accommodated in the accommodation groove 2112 . Of course, in other embodiments, the second insulating member 26 may also be entirely located in the accommodation groove 2112 .

[0355] By providing an accommodating groove 2112 for accommodating the second insulating member 26 on the side of the wall portion 211 away from the electrode assembly 22, it is convenient to assemble the second insulating member 26 between the second limiting portion 2321 and the wall portion 211, which can play a role in assembly positioning of the second insulating member 26, which is beneficial to reducing the difficulty of assembling the second insulating member 26, and can play a certain protective role for the second insulating member 26, so as to reduce the wear or damage of the second insulating member 26 during use.

[0356] According to some embodiments of the present application, referring to Figures 15 and 16, Figure 15 is a cross-sectional view of the electrode terminal 23 of the battery cell 20 provided in some embodiments of the present application in other embodiments, and Figure 16 is a structural explosion diagram of the electrode terminal 23 of the battery cell 20 provided in some embodiments of the present application in other embodiments. The second terminal portion 232 includes a first material layer 234 and a second material layer 235 that are composited with each other. The first material layer 234 is connected to the first terminal portion 231, and the second material layer 235 is used to connect to the conduit component. The material of the first material layer 234 is different from the material of the second material layer 235. The material of the first material layer 234 is the same as the material of the first terminal portion 231, and the material of the second material layer 235 is the same as the material of the conduit component.

[0357] Among them, the second terminal portion 232 includes a first material layer 234 and a second material layer 235 that are composited with each other. The material of the first material layer 234 and the material of the second material layer 235 are different. That is, the second terminal portion 232 is composed of a first material layer 234 and a second material layer 235 of different materials composited and connected with each other. Optionally, the first material layer 234 and the second material layer 235 of the second terminal portion 232 can be connected by a composite process such as hot pressing or cold pressing.

[0358] The first material layer 234 is connected to the first terminal portion 231. The material of the first material layer 234 is the same as the material of the first terminal portion 231. That is, the first material layer 234 and the first terminal portion 231 are interconnected in the second terminal portion 232, and the material of the first material layer 234 is the same as the material of the first terminal portion 231. This ensures that the portion of the second terminal portion 232 used for welding to the first terminal portion 231 is made of the same material, which helps reduce welding difficulty and improve welding quality. Correspondingly, the material of the first terminal portion 231 is the same as the material of the tab 221 of the electrode assembly 22, so that the first terminal portion 231 and the tab 221 of the electrode assembly 22 are connected to each other with the same material.

[0359] The second material layer 235 is used to be connected to the convergence component, and the material of the second material layer 235 is the same as the material of the convergence component, that is, the second material layer 235 and the convergence component are interconnected in the second terminal portion 232, and the material of the second material layer 235 is the same as the material of the convergence component, so as to achieve the same material as the part of the second terminal portion 232 used for welding with the convergence component, which is conducive to reducing the difficulty of welding and improving the welding quality.

[0360] It should be noted that the material of the first material layer 234 is the same as the material of the first terminal portion 231, which means that the main component of the first material layer 234 is the same as the main component of the first terminal portion 231. For example, if the first material layer 234 and the first terminal portion 231 are both made of a single material, such as copper or aluminum, then the first material layer 234 and the first terminal portion 231 are composed of the same metal elements; if the first material layer 234 and the first terminal portion 231 are alloy materials or mixed materials, such as aluminum alloy or steel, then the material of the first material layer 234 and the first terminal portion 231 is the same as the main component of the first material layer 234 and the first terminal portion 231. If the first material layer 234 and the first terminal portion 231 are only different in the content of the components, they are also the same material. Similarly, the material of the second material layer 235 is the same as the material of the convergence component, which means that the main component of the second material layer 235 is the same as the main component of the convergence component. For example, if the second material layer 235 and the convergence component are both made of a single material, such as copper or aluminum, then the second material layer 235 and the convergence component are composed of the same metal elements; if the second material layer 235 and the convergence component are alloy materials or mixed materials, such as aluminum alloy or steel, then the material of the second material layer 235 and the convergence component is the same, which means that the main components of the second material layer 235 and the convergence component are the same. If the second material layer 235 and the convergence component are different only in the content of the components, they are also the same material.

[0361] By setting the second terminal portion 232 to be composed of a first material layer 234 and a second material layer 235 that are compositely connected to each other, and the material of the first material layer 234 is the same as the material of the first terminal portion 231, and the material of the second material layer 235 is the same as the material of the convergence component, so that the first terminal portion 231 can be connected to the pole ear 221 of the electrode assembly 22 of the same material, and the second material layer 235 of the second terminal portion 232 can be connected to the convergence component of the same material, so that the electrode terminal 23 of this structure can realize the connection between the pole ear 221 of the electrode assembly 22 of different materials and the convergence component, which is beneficial to improving the overcurrent effect and can alleviate the quality problems caused by the mutual assembly and connection between different materials.

[0362] In some embodiments, please continue to refer to Figures 15 and 16 , the first material layer 234 and the second material layer 235 are stacked along the thickness direction X of the wall, and the first material layer 234 is located on the side of the second material layer 235 facing the electrode assembly 22.

[0363] Among them, in the embodiment where the second terminal portion 232 includes the second limiting portion 2321 and the second protrusion 2322, the connection interface between the first material layer 234 and the second material layer 235 can be within the second limiting portion 2321 or within the second protrusion 2322. Of course, in some embodiments, the second terminal portion 232 can also be that the second limiting portion 2321 is entirely the second material layer 235, and correspondingly, the second protrusion 2322 is entirely the first material layer 234.

[0364] For example, in FIG. 15 , the connection interface between the first material layer 234 and the second material layer 235 is located within the second limiting portion 2321 , that is, the second limiting portion 2321 includes both the first material layer 234 and the second material layer 235 .

[0365] It should be noted that the first material layer 234 and the second material layer 235 are not limited to being stacked along the thickness direction X of the wall. In other embodiments, the second material layer 235 may also be a structure surrounding the outer periphery of the first material layer 234 .

[0366] By setting the first material layer 234 and the second material layer 235 of the second terminal portion 232 as a structure stacked along the thickness direction X of the wall portion, and the first material layer 234 is located on the side of the second material layer 235 facing the electrode assembly 22, the second terminal portion 232 with such a structure can, on the one hand, realize the facing arrangement of the first material layer 234 and the first terminal portion 231, so that the first material layer 234 and the first terminal portion 231 are assembled and connected to each other, and on the other hand, it is convenient to compositely connect the first material layer 234 and the second material layer 235 together, which is beneficial to reduce the difficulty of compositely connecting the first material layer 234 and the second material layer 235.

[0367] According to some embodiments of the present application, as shown in Figures 3 and 4, the housing 21 may include a shell 212 and an end cap 213. The shell 212 has an interior formed with an accommodating cavity having an opening 2121, which is used to accommodate the electrode assembly 22. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0368] The end cover 213 is a wall portion 211 , that is, the electrode terminal 23 is mounted on the end cover 213 , and the mounting hole 2111 is provided on the end cover 213 .

[0369] By setting the wall portion 211 of the outer shell 21 as the end cover 213 of the outer shell 21 for closing the opening 2121 of the shell 212, the battery cell 20 adopting this structure is convenient for assembling the electrode terminal 23 on the end cover 213, and is convenient for assembling and connecting the electrode terminal 23 and the electrode assembly 22 with each other, which is beneficial to reducing the assembly difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0370] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 may also have other structures. For example, the outer shell 21 may include a shell 212 and an end cap 213. The shell 212 includes an integrally formed side wall and a wall portion 211. The side wall is arranged around the wall portion 211. Along the thickness direction X of the wall portion, one end of the side wall is connected to the wall portion 211, and the other end is enclosed to form an opening 2121. The side wall and the wall portion 211 jointly define a receiving cavity for accommodating the electrode assembly 22, and the end cap 213 closes the opening 2121. In other words, the wall portion 211 is the bottom wall of the shell 212 arranged opposite the end cap 213 in the thickness direction X of the wall portion, that is, the electrode terminal 23 is mounted on the bottom wall of the shell 212, and the mounting hole 2111 is provided on the bottom wall of the shell 212.

[0371] The shell 212 includes an integrally formed side wall and wall portion 211 , that is, the shell 212 is manufactured using an integral molding process, such as an integral molding process such as stamping, casting or extrusion molding. In other words, the side wall and wall portion 211 of the shell 212 are an integral structure.

[0372] By setting the wall portion 211 of the outer shell 21 as a wall arranged opposite to the end cover 213 in the thickness direction X of the wall portion of the shell 212, the battery cell 20 adopting this structure can make the area of ​​the outer shell 21 where the electrode terminal 23 is installed away from the end cover 213, and make there no direct connection relationship between the wall portion 211 and the end cover 213, thereby alleviating the phenomenon that the force generated when the electrode terminal 23 and other components pull or twist the wall portion 211 acts on the end cover 213, thereby reducing the risk of connection failure between the end cover 213 and the shell 212, and further helping to reduce the risk of leakage of the battery cell 20 during use.

[0373] According to some embodiments of the present application, the present application further provides a battery 100 , which includes the battery cell 20 of any of the above solutions.

[0374] As shown in FIG. 2 , the battery 100 may further include a box body 10 , in which the battery cells 20 are accommodated.

[0375] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12 . The first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20 .

[0376] 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, and 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 jointly define an 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.

[0377] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a rectangular parallelepiped, etc. For example, in FIG2 , the box body 10 is a rectangular parallelepiped structure.

[0378] Optionally, the number of battery cells 20 disposed within the housing 10 may be one or more. For example, in FIG2 , the housing 10 of the battery 100 includes multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a configuration in which multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery 100 may comprise multiple battery cells 20 that are first connected in series, in parallel, or in a hybrid configuration to form a battery module, which is then connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 10.

[0379] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component that connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0380] It should be noted that in some embodiments, the battery 100 may not be provided with a housing 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of multiple battery cells 20 can be directly assembled on an electrical device to provide electrical energy to the electrical device through the multiple battery cells 20. In other words, the housing 10 can serve as part of the electrical device. Taking the vehicle 1000 as an example, the housing 10 can serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can form at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 can form at least a portion of the crossbeam and longitudinal beam of the vehicle 1000.

[0381] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0382] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0383] According to some embodiments of the present application, as shown in Figures 3 to 6, the present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22, an electrode terminal 23, a current collecting member 24, a seal 27, a first insulating member 25, and a second insulating member 26. The shell 21 has a wall portion 211, and the wall portion 211 is provided with a mounting hole 2111. The mounting hole 2111 passes through the wall portion 211 along the thickness direction X of the wall portion. The shell 21 includes a shell 212 and an end cover 213. The interior of the shell 212 forms a receiving cavity with an opening 2121. The end cover 213 closes the opening 2121, and the end cover 213 is the wall portion 211. The electrode assembly 22 is accommodated in the receiving cavity of the shell 212, and the electrode assembly 22 has a tab 221. The electrode terminal 23 is inserted into the mounting hole 2111 and includes a first terminal portion 231 and a second terminal portion 232, which are arranged and connected along the wall thickness direction X. The first terminal portion 231 includes a first stopper 2311 and a first protrusion 2312. Along the wall thickness direction X, the first stopper 2311 is located on the side of the wall 211 facing the electrode assembly 22, while the first protrusion 2312 is located on the side of the first stopper 2311 facing away from the electrode assembly 22. The first protrusion 2312 extends through the mounting hole 2111 along the wall thickness direction X. The second terminal portion 232 includes a second stopper 2321 and a second protrusion 2322. Along the wall thickness direction X, the second stopper 2321 is located on the side of the wall 211 facing away from the electrode assembly 22, with at least a portion of the wall 211 located between the second stopper 2321 and the first stopper 2311. A second protrusion 2322 is provided on the side of the second stopper 2321 facing the electrode assembly 22 and is connected to the first protrusion 2312. The first and second stopper portions 2311 and 2321 are configured to cooperate with the clamping wall portion 211 to restrict the electrode terminal 23 from separating from the wall portion 211 along the wall portion's thickness direction X. Along the wall portion's thickness direction X, a first groove 2313 is formed on the side of the first terminal portion 231 facing the electrode assembly 22, corresponding to the position of the first protrusion 2312. The first protrusion 2312 and the second protrusion 2322 are welded together to form a first weld mark 233. At least a portion of the first weld mark 233 is formed on the bottom surface of the first groove 2313. The current collecting member 24 is disposed between the wall portion 211 and the electrode assembly 22. The current collecting member 24 connects the first stopper 2311 of the first terminal portion 231 and the tab 221 of the electrode assembly 22 to electrically connect the first terminal portion 231 and the electrode assembly 22. The current collecting member 24 is spaced apart from the first weld mark 233. The current collecting member 24 is welded to the first stopper 2311 to form a second weld mark 28.Along the wall's thickness direction X, the first stopper 2311 has a first surface 2311a facing the electrode assembly 22. The first groove 2313 is recessed from the first surface 2311a in a direction away from the electrode assembly 22. The first surface 2311a is connected to the current collecting member 24. A seal 27 is disposed between the wall 211 and the electrode terminal 23, with at least a portion of the seal 27 located within the mounting hole 2111 to seal the gap between the electrode terminal 23 and the wall surface of the mounting hole 2111. Along the wall's thickness direction X, the seal 27 has an abutment surface 271, which abuts against the side of the first stopper 2311 facing away from the electrode assembly 22. The projection of the second weld mark 28 in the wall's thickness direction X does not overlap with the abutment surface 271. Along the thickness direction X of the wall, at least a portion of the first insulating member 25 is located between the first limiting portion 2311 and the wall portion 211 to insulate and isolate the first limiting portion 2311 and the wall portion 211, and at least a portion of the second insulating member 26 is located between the second limiting portion 2321 and the wall portion 211 to insulate and isolate the second limiting portion 2321 and the wall portion 211.

[0384] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0385] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, comprising: The housing has a wall portion, the wall portion is provided with a mounting hole, and the mounting hole penetrates the wall portion along the thickness direction of the wall portion; an electrode assembly housed in the housing; as well as The electrode terminal is inserted into the mounting hole, and includes a first terminal portion and a second terminal portion which are separately arranged, the first terminal portion and the second terminal portion are arranged and connected along the thickness direction of the wall portion, at least a portion of the first terminal portion is located on a side of the wall portion facing the electrode assembly, and is electrically connected to the electrode assembly, and at least a portion of the second terminal portion is located on a side of the wall portion away from the electrode assembly, and the first terminal portion and the second terminal portion are configured to cooperate and clamp the wall portion.

2. The battery cell according to claim 1, wherein: The first terminal portion includes: a first limiting portion, along a thickness direction of the wall portion, the first limiting portion being located at a side of the wall portion facing the electrode assembly, the first limiting portion being configured to cooperate with the second terminal portion to clamp the wall portion; The first protrusion is protrudingly provided on a side of the first limiting portion away from the electrode assembly. The first protrusion penetrates the mounting hole along the thickness direction of the wall portion and is connected to the second terminal portion.

3. The battery cell according to claim 2, wherein: The second terminal portion includes: a second limiting portion, along the thickness direction of the wall portion, the second limiting portion is located at a side of the wall portion away from the electrode assembly, at least a portion of the wall portion is located between the second limiting portion and the first limiting portion, and the second limiting portion is configured to cooperate with the first limiting portion to clamp the wall portion; The second protrusion is protrudingly disposed on a side of the second limiting portion facing the electrode assembly, and the second protrusion is connected to the first protrusion.

4. The battery cell according to claim 2 or 3, wherein: Along the thickness direction of the wall portion, a first groove is formed at a side of the first terminal portion facing the electrode assembly and corresponding to a position of the first protrusion.

5. The battery cell according to claim 4, wherein: The first protrusion is welded to the second terminal portion to form a first weld mark, and at least a portion of the first weld mark is formed on the bottom surface of the first groove.

6. The battery cell according to claim 5, wherein: The battery cell further comprises: a current collecting member disposed between the wall portion and the electrode assembly, the current collecting member connecting the first terminal portion and the electrode assembly to electrically connect the first terminal portion and the electrode assembly; Wherein, the current collecting component is spaced apart from the first weld mark.

7. The battery cell according to claim 6, wherein: Along the thickness direction of the wall portion, the first limiting portion has a first surface facing the electrode assembly, the first groove is recessed from the first surface toward a direction away from the electrode assembly, and the first surface is connected to the current collecting member.

8. The battery cell according to claim 6, wherein: Along the thickness direction of the wall portion, a first convex portion is protruded on a side of the current collecting member away from the electrode assembly, and the first convex portion extends into the first groove and is connected to the groove bottom surface of the first groove; Wherein, a first avoidance groove for avoiding the first weld mark is provided at one end of the first convex portion facing the bottom surface of the first concave groove.

9. The battery cell according to claim 8, wherein: Along the thickness direction of the wall portion, the groove depth of the first avoidance groove is H1, which satisfies 0.1 mm≤H1≤0.5 mm.

10. The battery cell according to claim 6, wherein: Along the thickness direction of the wall portion, a first convex portion is protruded on a side of the current collecting member away from the electrode assembly, and the first convex portion extends into the first groove and is connected to the groove bottom surface of the first groove; Wherein, the first weld mark surrounds the outer side of the first protrusion.

11. The battery cell according to any one of claims 8 to 10, wherein: A second groove is formed on a side of the current collecting member facing the electrode assembly and corresponding to a position of the first protrusion along a thickness direction of the wall portion.

12. The battery cell according to claim 1, wherein: The second terminal portion includes: a second limiting portion, along the thickness direction of the wall portion, the second limiting portion is located at a side of the wall portion away from the electrode assembly, and the second limiting portion is configured to cooperate with the first terminal portion to clamp the wall portion; The second protrusion is protrudingly provided on a side of the second limiting portion facing the electrode assembly. The second protrusion penetrates the mounting hole along the thickness direction of the wall portion and is connected to the first terminal portion.

13. The battery cell according to claim 12, wherein: Along the thickness direction of the wall portion, the first terminal portion is entirely located on a side of the wall portion facing the electrode assembly.

14. The battery cell according to claim 12 or 13, wherein: The first terminal portion has a second surface facing away from the electrode assembly along a thickness direction of the wall portion, and the second surface is connected to the second protrusion.

15. The battery cell according to claim 14, wherein: The second surface is a plane and is perpendicular to the thickness direction of the wall portion.

16. The battery cell according to claim 15, wherein: The electrode assembly has a tab, and along the thickness direction of the wall portion, the tab is connected to a side of the first terminal portion facing the electrode assembly to electrically connect the electrode assembly and the first terminal portion.

17. The battery cell according to any one of claims 14 to 16, wherein: Along the thickness direction of the wall portion, the first terminal portion has a third surface facing the electrode assembly, and the third surface is provided with a third groove; The second protrusion is welded to the second surface to form a first weld mark, and at least a portion of the first weld mark is formed on the bottom surface of the third groove.

18. The battery cell according to claim 17, wherein: The battery cell further comprises: A current collecting member is disposed between the wall portion and the electrode assembly, and the current collecting member connects the first terminal portion and the electrode assembly to electrically connect connecting the first terminal portion and the electrode assembly; Wherein, along the thickness direction of the wall portion, the current collecting component is connected to the third surface, and the current collecting component is spaced apart from the bottom surface of the third groove.

19. The battery cell according to claim 18, wherein: Along the thickness direction of the wall portion, the groove depth of the third groove is H2, which satisfies 0.1 mm ≤ H2 ≤ 0.5 mm.

20. The battery cell according to claim 12 or 13, wherein: Along the thickness direction of the wall portion, the first terminal portion has a second surface away from the electrode assembly, the second surface is provided with a fourth groove, and the second protrusion is inserted into the fourth groove and connected to the groove bottom surface of the fourth groove.

21. The battery cell according to claim 20, wherein: The second protrusion is welded to the bottom surface of the fourth groove to form a first weld mark, and the first weld mark extends to a side of the first terminal portion facing the electrode assembly.

22. The battery cell according to claim 21, wherein: The battery cell further comprises: a current collecting member disposed between the wall portion and the electrode assembly, the current collecting member connecting the first terminal portion and the electrode assembly to electrically connect the first terminal portion and the electrode assembly; Among them, along the thickness direction of the wall portion, the first terminal portion has a third surface facing the electrode assembly, the current collecting component is connected to the third surface, and a second avoidance groove for avoiding the first weld mark is provided on the side of the current collecting component away from the electrode assembly.

23. The battery cell according to claim 22, wherein: The third surface is provided with a third protrusion, and the first weld mark extends to an end of the third protrusion facing the electrode assembly; Wherein, along the thickness direction of the wall portion, the third protrusion is inserted into the second avoidance groove, and the third protrusion is spaced apart from the bottom surface of the second avoidance groove.

24. The battery cell according to claim 23, wherein: Along the thickness direction of the wall portion, a distance between the third protrusion and the bottom surface of the second avoidance groove is H3, satisfying 0.1 mm ≤ H3 ≤ 0.5 mm.

25. The battery cell according to any one of claims 22 to 24, wherein: A second convex portion is formed on a side of the current collecting member facing the electrode assembly and at a position corresponding to the second avoidance groove along a thickness direction of the wall portion.

26. The battery cell according to any one of claims 1 to 25, wherein: The first terminal portion and the second terminal portion are connected by welding.

27. The battery cell according to any one of claims 1 to 26, wherein: The first terminal portion has a first limiting portion, and along the thickness direction of the wall portion, the first limiting portion is located on a side of the wall portion facing the electrode assembly, and the first limiting portion is configured to cooperate with the second terminal portion to clamp the wall portion; The battery cell further includes a current collecting component, which is disposed between the wall portion and the electrode assembly, and connects the electrode assembly and the first limiting portion to electrically connect the first terminal portion and the electrode assembly.

28. The battery cell according to claim 27, wherein: The first terminal portion is welded to the second terminal portion, and the current collecting component is welded to the first limiting portion; Wherein, along the thickness direction of the wall portion, the thickness of the first limiting portion is greater than the thickness of a region where the first terminal portion and the second terminal portion are welded and connected.

29. The battery cell according to claim 27 or 28, wherein: The current collecting component is welded to the first limiting portion to form a second weld mark; The battery cell further includes a sealing member, the sealing member is disposed between the wall portion and the electrode terminal, and at least a portion of the sealing member is located in the mounting hole to seal a gap between the electrode terminal and a hole wall surface of the mounting hole, and the sealing member has a contact surface along a thickness direction of the wall portion, the contact surface contacts a side of the first limiting portion away from the electrode assembly; Wherein, a projection of the second weld mark in the thickness direction of the wall portion does not overlap with the abutment surface.

30. The battery cell according to claim 27 or 28, wherein: The current collecting component is welded to the first limiting portion; The battery cell further includes a sealant, which is disposed between the wall portion and the electrode terminal, and at least a portion of the sealant is located in the mounting hole to seal a gap between the electrode terminal and a hole wall surface of the mounting hole; Wherein, along the thickness direction of the wall portion, the sealing component and the first limiting portion are arranged at a distance.

31. The battery cell according to claim 30, wherein: The battery cell further comprises: a first insulating member, wherein at least a portion of the first insulating member is located between the first limiting portion and the wall portion along a thickness direction of the wall portion, so as to insulate and isolate the first limiting portion and the wall portion; Wherein, the first insulating member extends between the sealing member and the first limiting portion to separate the sealing member from the first limiting portion.

32. The battery cell according to claim 27 or 28, wherein: The current collecting component is welded to the first limiting portion to form a second weld mark; The battery cell further includes a sealing member, which is disposed between the wall portion and the electrode terminal, and at least a portion of the sealing member is located in the mounting hole to seal a gap between the electrode terminal and a hole wall surface of the mounting hole, and along a thickness direction of the wall portion, the sealing member abuts against a side of the first limiting portion away from the electrode assembly; Wherein, along the thickness direction of the wall portion, the distance between the second weld mark and the sealing member is L, satisfying 0.1 mm ≤ L ≤ 1.3 mm.

33. The battery cell according to any one of claims 1 to 32, wherein: The first terminal portion and the second terminal portion do not overlap in a direction perpendicular to a thickness direction of the wall portion.

34. The battery cell according to any one of claims 1 to 33, wherein: The first terminal portion has a first limiting portion, and the second terminal portion has a second limiting portion; Among them, along the thickness direction of the wall portion, the first limiting portion is located on the side of the wall portion facing the electrode assembly, and the second limiting portion is located on the side of the wall portion away from the electrode assembly, and the first limiting portion and the second limiting portion are configured to cooperate to clamp the wall portion.

35. The battery cell according to claim 34, wherein: The battery cell further comprises: A first insulating member is provided, along a thickness direction of the wall portion, wherein at least a portion of the first insulating member is located between the first limiting portion and the wall portion to insulate and isolate the first limiting portion and the wall portion.

36. The battery cell according to claim 34 or 35, wherein: The battery cell further comprises: A second insulating member is provided along the thickness direction of the wall portion, wherein at least a portion of the second insulating member is located between the second limiting portion and the wall portion to insulate and isolate the second limiting portion from the wall portion.

37. The battery cell according to claim 36, wherein: Along the thickness direction of the wall portion, a receiving groove is provided on one side of the wall portion away from the electrode assembly, the mounting hole is provided on the bottom surface of the receiving groove, and at least a portion of the second insulating member is received in the receiving groove.

38. The battery cell according to any one of claims 1 to 36, wherein: The second terminal portion includes a first material layer and a second material layer that are composited with each other, the first material layer is connected to the first terminal portion, and the second material layer is used to be connected to the current collecting component; The material of the first material layer is different from the material of the second material layer, the material of the first material layer is the same as the material of the first terminal portion, and the material of the second material layer is the same as the material of the confluence component.

39. The battery cell according to claim 38, wherein: The first material layer and the second material layer are stacked along the thickness direction of the wall portion, and the first material layer is located on a side of the second material layer facing the electrode assembly.

40. The battery cell according to any one of claims 1 to 39, wherein: The housing comprises: A shell body, wherein a receiving cavity with an opening is formed inside, and the receiving cavity is used to receive the electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion.

41. The battery cell according to any one of claims 1 to 39, wherein: The housing comprises: A shell, comprising an integrally formed side wall and the wall portion, wherein the side wall is disposed around the wall portion, and along the thickness direction of the wall portion, one end of the side wall is connected to the wall portion, and the other end is enclosed to form an opening, and the side wall and the wall portion jointly define a housing cavity for housing the electrode assembly; An end cap closes the opening.

42. A battery comprising the battery cell according to any one of claims 1 to 41.

43. An electrical device, comprising a battery cell as claimed in any one of claims 1 to 41, wherein the battery cell is used to provide electrical energy.

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