Shell assembly, battery cell, battery and electric device

Abstract

The invention discloses a shell assembly, a single battery, a battery and a power utilization device, the shell assembly comprises a shell and a first pole, a mounting hole is formed in the shell, the first pole comprises a pole body, a first limiting table and a second limiting table which are integrally formed, and the pole body is arranged in the mounting hole in a penetrating manner; the first limiting table and the second limiting table are arranged at the two ends of the pole body in the axial direction of the mounting hole, the first limiting table is matched with the outer side of the shell in a limiting manner, and the second limiting table is matched with the inner side of the shell in a limiting manner, so that the first pole is riveted to the shell. According to the shell assembly provided by the invention, the assembly is convenient, and the reliability and the stability of the connection between the first pole and the shell can be improved.

Description

Housing components, battery cells, batteries and electrical devices Technical Field

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

[0002] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, batteries, as the power source, play an irreplaceable and crucial role. Typically, batteries consist of multiple cells, which are charged and discharged via terminals. Currently, terminals are typically welded to the cell housing, making installation complex and hindering production efficiency.

[0003] Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the related art. To this end, the present application proposes a housing assembly, a battery cell, a battery and an electrical device that are easy to assemble.

[0005] In a first aspect, an embodiment of the present application provides a shell assembly, comprising: a shell, the shell being formed with a mounting hole; a first pole, the first pole comprising an integrally formed pole body, a first limit platform and a second limit platform, the pole body being passed through the mounting hole, the first limit platform and the second limit platform being arranged at both ends of the pole body along the axial direction of the mounting hole, and the first limit platform being limitedly fitted to the outer side of the shell, and the second limit platform being limitedly fitted to the inner side of the shell, so that the first pole is riveted to the shell.

[0006] In the above technical solution, on the one hand, the structure of the first pole includes a pole body, a first limit platform and a second limit platform, so that the first pole can be riveted to the shell, which facilitates the assembly of the first pole and the shell, simplifies the manufacturing process, and improves the reliability and stability of the connection between the first pole and the shell; at the same time, the pole body, the first limit platform and the second limit platform of the first pole are formed in one piece, which can save parts and costs and ensure the strength of the first pole, so that after the first pole is matched with the shell, it is not easy to separate from the shell due to vibration or external pulling during the charging and discharging process of the battery cell, nor is it easy to crack or be damaged due to vibration or external pulling, which can improve the stability and reliability of the battery cell.

[0007] In some embodiments, with the cross-section of the mounting hole as the projection surface and the axial direction of the mounting hole as the projection direction, at least a portion of the circumferential contour of the projection of the first limit platform on the projection surface is a straight line; and / or, at least a portion of the circumferential contour of the projection of the second limit platform on the projection surface is a straight line.

[0008] In the above technical solution, the first and second limit platforms are the portions of the terminal post that are riveted to the housing after the flanging is formed. After the flanging is riveted, when at least portions of the first and second limit platforms are straight lines, the straight lines are subject to less tension than the curved lines, making them less susceptible to cracking after the flanging is riveted. This ensures the strength of the first terminal post, improving its reliability and stability, and thereby further improving the reliability and stability of the battery cell. Furthermore, when at least portions of the first and second limit platforms are straight lines, they can adapt to the conductive portion of the sheet structure, allowing the conductive portion to fully utilize the space in the first terminal post, thereby fully improving the space utilization of the first terminal post and ensuring the energy density and fast-charging performance of the battery cell.

[0009] In some embodiments, the cross-section of the mounting hole is used as the projection surface, and the axial direction of the mounting hole is used as the projection direction; the circumferential contour of the projection of the first limit platform on the projection surface is composed of a combination of straight lines and arcs; and / or, the circumferential contour of the projection of the second limit platform on the projection surface is composed of a combination of straight lines and arcs.

[0010] In the above technical solution, after the flanging and riveting, the straight parts of the first limit platform and the second limit platform are subjected to less pulling than the arc parts, and are not prone to cracking after the flanging and riveting, which can ensure the strength of the pole, improve the reliability and stability of the pole, and thus further improve the reliability and stability of the battery cell; the arc parts of the first limit platform and the second limit platform are used to ensure that the first limit platform or the second limit platform can be smoothly riveted to the shell, and can also be used as a transition between straight parts to ensure the overall strength of the pole, so as to ensure the reliability and stability of the battery cell.

[0011] In some embodiments, with the cross-section of the mounting hole as the projection surface and the axial direction of the mounting hole as the projection direction, the circumferential profile of the projection of the first limit platform on the projection surface includes two straight lines and two arcs, the two straight lines are opposite and spaced apart, and the opposite ends of the two straight lines are respectively connected by an arc; and / or, the circumferential profile of the projection of the second limit platform on the projection surface includes two straight lines and two arcs, the two straight lines are opposite and spaced apart, and the opposite ends of the two straight lines are respectively connected by an arc.

[0012] In the above technical solution, by setting the circumferential contour of the projection of the first limit platform on the projection surface to include two straight lines and two arcs, and / or setting the circumferential contour of the projection of the second limit platform on the projection surface to include two straight lines and two arcs, it is convenient to make the part of the projection contour corresponding to the first limit platform as a straight line and the part of the projection contour corresponding to the first limit platform as a curve have an appropriate proportion, and / or, making the part of the projection contour corresponding to the second limit platform as a straight line and the part of the projection contour corresponding to the second limit platform as a curve have an appropriate proportion, which is conducive to further taking into account the strength of the first pole and the smoothness of riveting, thereby improving the reliability and stability of the battery cell.

[0013] In some embodiments, the cross-section of the mounting hole is used as the projection surface, and the axial direction of the mounting hole is used as the projection direction; the size of the projection of the first limit platform on the projection surface in the first direction is larger than the size of the projection of the first limit platform on the projection surface in the second direction; and / or, the size of the projection of the second limit platform on the projection surface in the first direction is larger than the size of the projection of the second limit platform on the projection surface in the second direction; wherein the first direction, the second direction and the axial direction are perpendicular to each other.

[0014] In the above technical solution, the first and second limit platforms are set to be long strips, which can increase the length of the first pole and the shell, improve the stability and reliability of riveting, and further improve the stability and reliability of the battery cell.

[0015] In some embodiments, the size of the projection of the first limit platform on the projection surface in the first direction is greater than three times the size of the projection of the first limit platform on the projection surface in the second direction; and / or, the size of the projection of the second limit platform on the projection surface in the first direction is greater than three times the size of the projection of the second limit platform on the projection surface in the second direction.

[0016] In the above technical solution, by setting the size of the projection of the first limit platform and / or the second limit platform on the projection surface in the first direction to be greater than or equal to three times the size of its projection on the projection surface in the second direction, it can be applicable to the situation where the wall of the shell on which the first pole is set is longer in the first direction, and the size of the wall of the shell on which the first pole is set can be fully utilized to increase the riveting area of ​​the first pole and the shell, so as to increase the riveting strength of the first pole and the shell, thereby improving the reliability and stability of the battery cell.

[0017] In some embodiments, the housing has a first wall, the mounting hole is formed in the first wall, the first direction is a length direction of the first wall, and the second direction is a width direction of the first wall.

[0018] In the above technical solution, by setting the first direction as the length direction of the first wall and the second direction as the width direction of the first wall, the length direction of the first wall can be consistent with the length direction of the cross section of the pole, and the width direction of the first wall can be consistent with the width direction of the cross section of the first pole, so as to effectively make the first wall and the first pole on the first wall well matched in both the first direction and the second direction, so that the first pole on the first wall can further make full use of the layout area provided by the first wall, so as to increase the riveting area of ​​the first pole and the shell, so as to increase the riveting strength of the first pole and the shell, thereby improving the reliability and stability of the battery cell.

[0019] In some embodiments, the length dimension of the pole body in the first direction is greater than or equal to 1 / 3 of the length dimension of the first wall in the first direction; and / or, the width dimension of the pole body in the second direction is greater than or equal to 1 / 4 of the width dimension of the first wall in the second direction; and / or, the cross-sectional area of ​​the portion of the pole body that cooperates with the mounting hole is greater than or equal to 4% of the area of ​​the first wall; and / or, along the axial direction of the mounting hole, the ratio of the thickness dimension of the pole body to the thickness dimension of the first wall is greater than 1 and less than 1.5.

[0020] In the above technical solution, when at least one of the length ratio and width ratio of the pole body to the first wall meets the above corresponding range, the pole body accounts for a large proportion in the length and width directions of the first wall, and the size of the matching portion of the pole body and the mounting hole is large, which can improve the stability of the riveting between the first pole and the first wall, ensure the riveting strength of the first pole, and thus improve the reliability and stability of the battery cell; when the cross-sectional area ratio of the pole body to the area of ​​the first wall is within the above range, the flow area of ​​the first pole is large, which can improve the flow and fast charging capabilities of the first pole; when the thickness ratio of the pole body to the thickness of the first wall meets the above corresponding range, it is convenient for the pole body to reliably match the mounting hole, so that the first limit platform and the second limit platform are respectively located on the inner and outer sides of the shell, so as to achieve smooth riveting of the first pole, improve the riveting convenience and riveting reliability. At the same time, when all parameters of the pole body are within the above range, the number of poles of the same polarity on the first wall can be one or more, in particular, two, and the two poles are spaced apart along the second direction.

[0021] In some embodiments, the length dimension of the pole body in the first direction is greater than or equal to 1 / 3 of the length dimension of the first wall in the first direction; and / or, the width dimension of the pole body in the second direction is greater than or equal to 1 / 2 of the width dimension of the first wall in the second direction; and / or, the circumference of the circumference of the pole body in cooperation with the mounting hole is greater than or equal to 25% of the circumference of the first wall; and / or, the cross-sectional area of ​​the portion of the pole body that cooperates with the mounting hole is greater than or equal to 10% of the area of ​​the first wall; and / or, along the axial direction of the mounting hole, the ratio of the thickness dimension of the pole body to the thickness dimension of the first wall is greater than 1 and less than 1.5.

[0022] In the above technical solution, when at least one of the ratio of the length of the pole body to the length of the first wall, the ratio of the width of the pole body to the width of the first wall, and the ratio of the circumference of the pole body and the mounting hole to the circumference of the first wall meets the above corresponding range, the pole body accounts for a large proportion in the length and width directions of the first wall, and the size of the matching part of the pole body and the mounting hole is large, which can improve the stability of the riveting between the first pole and the first wall, ensure the riveting strength of the first pole, and improve the reliability and stability of the battery cell; when the cross-sectional area of ​​the pole body and the area of ​​the first wall are within the above range, the flow area of ​​the first pole is large, which can improve the flow and fast charging capabilities of the first pole; when the thickness of the pole body and the thickness of the first wall meet the above corresponding range, it is convenient for the pole body to be reliably matched with the mounting hole, so that the first limit platform and the second limit platform are respectively located on the inner and outer sides of the shell, so as to achieve smooth riveting of the first pole and improve the riveting convenience and riveting reliability. At the same time, when all parameters of the pole body are within the above range, the number of first poles of the same polarity on the first wall can be one or more, in particular, two, and the two first poles are arranged at intervals along the second direction. Of course, the number of first poles of the same polarity can also be four.

[0023] In some embodiments, the length dimension of the first limit platform in the first direction is greater than or equal to 1 / 3 of the length dimension of the first wall in the first direction; and / or, the width dimension of the first limit platform in the second direction is greater than or equal to 1 / 4 of the width dimension of the first wall in the second direction; and / or, the cross-sectional area of ​​the first limit platform is greater than or equal to 4.5% of the area of ​​the first wall; and / or, along the axial direction of the mounting hole, the thickness dimension of the first limit platform is greater than or equal to 0.6 of the thickness dimension of the first wall, and less than or equal to 1.5 of the thickness dimension of the first wall.

[0024] In the above technical solution, when at least one of the ratio of the length of the first limit platform to the length of the first wall and the ratio of the width of the first limit platform to the width of the first wall meets the above corresponding range, the first limit platform accounts for a large proportion in the length direction and the width direction of the first wall, and the size of the matching part of the first limit platform and the mounting hole is large, which can improve the stability of the riveting between the first pole and the first wall, ensure the riveting strength of the first pole, and thus improve the reliability and stability of the battery cell; when the ratio of the cross-sectional area of ​​the first limit platform to the area of ​​the first wall is within the above range, the flow area of ​​the first pole is large, which can improve the flow and fast charging capabilities of the first pole; when the ratio of the thickness of the first limit platform to the thickness of the first wall meets the above corresponding range, it is easy to avoid the first pole from being easily separated from the first wall, further improve the riveting reliability, and is conducive to reducing the thickness of the part of the first limit platform protruding outside the shell, reducing the space occupied by the first pole outside the shell, and is conducive to improving the volume energy density of the battery. At the same time, when all parameters of the first limit platform are within the above range, the number of first poles of the same polarity on the first wall can be one or more, in particular, two, and the two first poles are arranged at intervals along the second direction. Of course, the number of first poles of the same polarity can also be four.

[0025] In some embodiments, the length dimension of the first limit platform in the first direction is greater than or equal to 1 / 3 of the length dimension of the first wall in the first direction; and / or, the width dimension of the first limit platform in the second direction is greater than or equal to 1 / 2 of the width dimension of the first wall in the second direction; and / or, the first limit platform is columnar, and the circumference dimension of the outer periphery of the first limit platform is greater than or equal to 30% of the circumference dimension of the first wall; and / or, the cross-sectional area of ​​the first limit platform is greater than or equal to 9% of the area of ​​the first wall; and / or, along the axial direction of the mounting hole, the thickness dimension of the first limit platform is greater than or equal to 0.6 of the thickness dimension of the first wall, and less than or equal to 1.5 of the thickness dimension of the first wall.

[0026] In the above technical solution, when at least one of the ratio of the length of the first limit platform to the length of the first wall, the ratio of the width of the first limit platform to the width of the first wall, and the ratio of the circumference of the first limit platform to the circumference of the first wall meets the above corresponding ranges, the first limit platform accounts for a large proportion in the length and width directions of the first wall, and the size of the matching part of the first limit platform and the mounting hole is large, which can improve the stability of the riveting between the first pole and the first wall, ensure the riveting strength of the first pole, and thus improve the reliability and stability of the battery cell; when the ratio of the cross-sectional area of ​​the first limit platform to the area of ​​the first wall is within the above range, the flow area of ​​the first pole is large, which can improve the flow and fast charging capabilities of the first pole; when the ratio of the thickness of the first limit platform to the thickness of the first wall meets the above corresponding range, it is easy to avoid the first pole from being easily separated from the first wall, further improve the riveting reliability, and is conducive to reducing the thickness of the part of the first limit platform protruding outside the shell, reducing the space occupied by the first pole outside the shell, and is conducive to improving the volume energy density of the battery. At the same time, when all parameters of the first limit platform are within the above range, the number of first poles of the same polarity on the first wall can be one or more, in particular, two, and the two first poles are arranged at intervals along the second direction. Of course, the number of first poles of the same polarity can also be four.

[0027] In some embodiments, the length dimension of the second limit platform in the first direction is greater than or equal to 1 / 3 of the length dimension of the first wall in the first direction; and / or, the width dimension of the second limit platform in the second direction is greater than or equal to 1 / 4 of the width dimension of the first wall in the second direction; and / or, the cross-sectional area of ​​the second limit platform is greater than or equal to 4.5% of the area of ​​the first wall; and / or, along the axial direction of the mounting hole, the thickness dimension of the second limit platform is greater than or equal to 0.6 of the thickness dimension of the first wall, and less than or equal to 1.5 of the thickness dimension of the first wall.

[0028] In the above technical solution, when at least one of the ratio of the length of the second limit platform to the length of the first wall and the ratio of the width of the second limit platform to the width of the first wall meets the above corresponding range, the second limit platform accounts for a large proportion in the length direction and the width direction of the first wall, and the size of the second limit platform and the matching part of the mounting hole is large, which can improve the stability of the riveting between the first pole and the first wall, ensure the riveting strength of the first pole, and thus improve the reliability and stability of the battery cell; when the ratio of the cross-sectional area of ​​the second limit platform to the area of ​​the first wall is within the above range, the flow area of ​​the first pole is large, which can improve the flow and fast charging capabilities of the first pole; when the ratio of the thickness of the second limit platform to the thickness of the first wall meets the above corresponding range, it is easy to avoid the first pole from being easily separated from the first wall, further improving the riveting reliability, and is conducive to reducing the thickness of the part of the second limit platform protruding from the shell, reducing the space occupied by the first pole in the shell, and is conducive to improving the volume energy density of the battery cell. At the same time, when all parameters of the second limit platform are within the above range, the number of first poles of the same polarity on the first wall can be one or more, in particular, two, and the two first poles are arranged at intervals along the second direction. Of course, the number of first poles of the same polarity can also be four.

[0029] In some embodiments, the length dimension of the second limit platform in the first direction is greater than or equal to 1 / 3 of the length dimension of the first wall in the first direction; and / or, the width dimension of the second limit platform in the second direction is greater than or equal to 1 / 2 of the width dimension of the first wall in the second direction; and / or, the second limit platform is columnar, and the circumference dimension of the outer periphery of the second limit platform is greater than or equal to 30% of the circumference dimension of the first wall; and / or, the cross-sectional area of ​​the second limit platform is greater than or equal to 9% of the area of ​​the first wall; and / or, along the axial direction of the mounting hole, the thickness dimension of the second limit platform is greater than or equal to 0.6 of the thickness dimension of the first wall, and less than or equal to 1.5 of the thickness dimension of the first wall.

[0030] In the above technical solution, when at least one of the ratio of the length of the second limit platform to the length of the first wall, the ratio of the width of the second limit platform to the width of the first wall, and the ratio of the outer circumference of the second limit platform to the circumference of the first wall meets the above corresponding range, the second limit platform accounts for a large proportion in the length and width directions of the first wall, and the size of the matching part of the second limit platform and the mounting hole is large, which can improve the stability of the riveting between the first pole and the first wall, ensure the riveting strength of the first pole, and thus improve the reliability and stability of the battery cell; when the ratio of the cross-sectional area of ​​the second limit platform to the area of ​​the first wall is within the above range, the flow area of ​​the first pole is large, which can improve the flow and fast charging capabilities of the first pole; when the ratio of the thickness of the second limit platform to the thickness of the first wall meets the above corresponding range, it is easy to avoid the first pole from being easily separated from the first wall, further improve the riveting reliability, and is conducive to reducing the thickness of the part of the second limit platform protruding from the shell, reducing the space occupied by the first pole in the shell, and is conducive to improving the volume energy density of the battery cell. At the same time, when all parameters of the second limit platform are within the above range, the number of first poles of the same polarity on the first wall can be one or more, in particular, two, and the two first poles are arranged at intervals along the second direction. Of course, the number of first poles of the same polarity can also be four.

[0031] In some embodiments, the shell has a first wall, two mounting holes are formed on the first wall, and the two mounting holes are respectively provided with two first poles, and the polarities of the two first poles are opposite; or, the shell has a first wall, four mounting holes are formed on the first wall, and the four mounting holes are respectively provided with four first poles, and the four first poles have the same polarity; or, the shell has a first wall and a second wall, the second wall is angled or opposite to the first wall and spaced apart, the first wall and the second wall are respectively formed with mounting holes, the mounting holes of the first wall and the mounting holes of the second wall are respectively provided with a first pole, and the polarities of the two first poles are opposite; or, the shell has a first wall, two mounting holes are formed on the first wall, and two first poles with the same polarity are respectively provided with the two mounting holes, the shell has a second wall that is angled or opposite to the first wall and spaced apart, the second wall is formed with two mounting holes, and the two mounting holes of the second wall are respectively provided with a first pole, and the polarity of the two first poles of the second wall is the same and opposite to the polarity of the first pole of the first wall.

[0032] In the above technical solution, by arranging poles on the corresponding walls of the shell, the poles can be flexibly arranged, which is conducive to meeting different arrangement requirements of battery cells and facilitating the simplification of power supply connections of battery cells.

[0033] In some embodiments, the housing assembly further includes: an insulating sealing component, which is disposed between the first pole and the housing.

[0034] In the above technical solution, by providing an insulating sealing component between the pole and the shell, the insulation and sealing between the pole and the shell are improved, so as to improve the reliability of the battery cell when the shell assembly is used in the battery cell.

[0035] In some embodiments, the insulating sealing component includes: an insulating member, which is arranged between the first limit platform and the shell; a sealing member, which is arranged between the second limit platform and the shell, and a portion of the insulating member and / or a portion of the sealing member is fitted between the pole body and the peripheral wall of the mounting hole.

[0036] In the above technical solution, by providing the insulating sealing component including the insulating member and the sealing member, the insulation setting between the pole and the shell is facilitated, and the sealing between the pole body and the mounting hole is improved.

[0037] In some embodiments, a first matching groove is formed on the outer side wall of the housing, and the first matching groove is used to accommodate the insulating member.

[0038] In the above technical solution, by providing a first matching groove on the outer side wall of the shell to accommodate the insulating part, it is convenient to achieve the limitation and installation of the insulating part, and to a certain extent, it can avoid the insulating part from being easily misplaced during the riveting process of the pole and the shell. At the same time, under the premise of reliable use of the shell, by providing the first matching groove, it is beneficial to reduce the height of the insulating part protruding from the outer side wall of the shell, which is beneficial to reduce the height of the pole protruding from the outer side wall of the shell, so as to improve the volume energy density of the battery cell.

[0039] In some embodiments, a mating protrusion is formed on the inner side wall of the housing, and the mating protrusion is in abutment with the sealing member.

[0040] In the above technical solution, by arranging a matching protrusion on the inner side wall of the shell to abut against the sealing member, it is beneficial to improve the sealing reliability of the sealing member.

[0041] In a second aspect, an embodiment of the present application further provides a battery cell, comprising a cell assembly and the above-mentioned shell assembly, wherein the cell assembly is disposed in the shell and electrically connected to the first pole.

[0042] In the above technical solution, by adopting the above-mentioned shell assembly, the assembly of the first pole and the shell is facilitated, and the reliability and stability of the connection between the first pole and the shell are improved; at the same time, it can save parts and costs, and ensure the strength of the first pole, so that after the first pole is matched with the shell, it is not easy to separate from the shell due to vibration or external pulling during the charging and discharging process of the battery cell, nor is it easy to crack or be damaged due to vibration or external pulling, which can improve the stability and reliability of the battery cell.

[0043] In some embodiments, the battery cell assembly includes an active material coating portion and a conductive portion, the active material coating portion is accommodated in a shell, and the conductive portion is used to electrically connect the active material coating portion and the first pole; the first pole is provided with a accommodating portion, and at least part of the conductive portion is accommodated in the accommodating portion.

[0044] In the above technical solution, on the one hand, the first electrode is provided with a receiving portion, which can reduce the weight of the first electrode to a certain extent, so as to improve the weight energy density of the battery cell and the battery; on the other hand, by accommodating at least part of the conductive part in the receiving portion to occupy the space in the first electrode, the space occupied by the conductive part in the shell can be reduced. When the size of the shell is fixed, some space can be saved in the shell to accommodate a larger active material coating part, thereby improving the volume energy density of the battery cell; at the same time, accommodating at least part of the conductive part in the receiving portion can reduce the space occupied by the battery cell itself, so that a battery of the same volume can accommodate a larger number of battery cells, thereby also improving the volume energy density of the battery; in addition, accommodating at least part of the conductive part in the receiving portion can also reduce the redundancy of the conductive part in the shell to a certain extent, reduce the probability of short circuit between the conductive part and the active material coating part, reduce the probability of short circuit of the electrode assembly, and thereby improve the working reliability and stability of the battery cell and the battery.

[0045] In some embodiments, the accommodating portion has a first accommodating groove, the surface of the first pole facing the active material coating portion is the inner end face of the pole, the notch of the first accommodating groove is formed on the inner end face of the pole, and at least part of the conductive portion is accommodated in the first accommodating groove.

[0046] In the above technical solution, on the one hand, the first receiving groove is provided on the first pole, which can reduce the weight of the first pole to a certain extent, so as to improve the weight energy density of the battery cell and the battery; on the other hand, since the notch of the first receiving groove is formed on the inner end face of the pole, and the inner end face of the pole is the surface of the first pole close to the active material coating part, the first receiving groove can be opened toward the active material coating part, thereby facilitating the conductive part to extend into the first receiving groove, thereby improving assembly efficiency; at the same time, since the first receiving groove is toward the active material coating part, the first receiving groove can also serve as a buffer and temporary storage structure for the electrolyte, so that the shell can accommodate It can hold more electrolyte. Since the electrolyte will be lost during the charge and discharge process of the battery cell, when there is more electrolyte, the service life of the battery cell can be extended. And because the first holding tank is facing the active material coating part, the first holding tank can also serve as a holding and buffer structure for the gas generated inside the electrode assembly, reducing the expansion of the battery cell and improving the reliability and stability of the battery cell. In addition, the first holding tank is located on the inner side of the pole, and external foreign matter and impurities are not easy to enter the first holding tank, thereby reducing the impact of external foreign matter and impurities on the electrode assembly, ensuring the stability and reliability of the electrode assembly, and thus improving the stability and reliability of the battery cell and the battery.

[0047] In some embodiments, the wall of the first receiving groove has a first sunken groove, and the position where the conductive portion is electrically connected to the first pole is at least partially located in the first sunken groove.

[0048] In the above technical solution, on the one hand, by arranging the first recessed groove on the first end wall, the first recessed groove can be used to achieve pre-positioning of the conductive part, which is beneficial for finding the correct position to achieve electrical connection and improve production efficiency; on the other hand, by arranging the first recessed groove on the first end wall, the local wall thickness of the first end wall can be locally thinned, which is not only beneficial for welding electrical connection, but also beneficial for reducing the weight of the first pole and improving the weight energy density of the battery cell.

[0049] In some embodiments, the first pole has a first groove, a surface of the first pole away from the active material coating portion is an outer end surface of the pole, and a notch of the first groove is formed on the outer end surface of the pole.

[0050] In the above technical solution, on the one hand, the first electrode is provided with a first groove, which can further reduce the weight of the first electrode, thereby improving the weight energy density of the battery cell and the battery. On the other hand, the first groove is located on the outside of the first electrode, and the first groove can be used to accommodate or install structural components in the battery that electrically connect the various battery cells, thereby fully utilizing the space within the first electrode and improving the space utilization rate and volume energy density of the battery. In addition, because the first electrode has both the first receiving groove and the first groove, the first groove is located on the side of the first receiving groove away from the active material coating portion, and the first groove is open in a direction away from the first receiving groove. This facilitates electrical connection between the conductive portion and the groove wall of the first receiving groove from the outside of the first electrode through the first groove. For example, it is convenient to externally weld the first electrode and the conductive portion through the first groove, which facilitates the processing and manufacturing of the battery cell and can save processing and manufacturing costs.

[0051] In some embodiments, the battery cell further includes a slot cover, which is disposed on the first pole and covers the notch of the first groove.

[0052] In the above technical solution, the provision of the slot cover facilitates the electrical connection between adjacent battery cells within the battery. Furthermore, because the location where the battery cells are electrically connected is separated from the location where the conductive portion is electrically connected to the first terminal by the first groove, interference between the two is minimized, further improving the stability and reliability of the battery cells. Furthermore, the slot cover prevents foreign matter from entering the first groove, reducing interference with the battery cell assembly and further improving the reliability and stability of the battery cells.

[0053] In some embodiments, the accommodating portion has a second accommodating groove, the surface of the first pole away from the active material coating portion is the outer end face of the pole, the notch of the second accommodating groove is formed on the outer end face of the pole, the second accommodating groove is connected to the interior of the shell through the first through-hole, the conductive portion is passed through the first through-hole and is at least partially accommodated in the second accommodating groove.

[0054] In the above technical solution, on the one hand, the first electrode is provided with a second receiving groove, which can reduce the weight of the first electrode to a certain extent, so as to improve the weight energy density of the battery cell and the battery; on the other hand, since the notch of the second receiving groove is formed on the outer end face of the electrode, and the outer end face of the electrode is the surface of the first electrode away from the active material coating part, the second receiving groove can be open in the direction away from the active material coating part. In this way, when at least part of the conductive part is accommodated in the second receiving groove, the conductive part can be easily stored and sorted through the notch of the second receiving groove, or the conductive part can be electrically connected to the first electrode, etc., thereby reducing the difficulty of producing the battery cell and improving the production efficiency of the battery cell. At the same time, since the second receiving tank can be connected to the shell through the first perforation, the second receiving tank can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell. Since the electrolyte will be consumed during the charging and discharging process of the battery cell, when there is more electrolyte, the service life of the battery cell can be extended; and because the second receiving tank can be connected to the shell through the first perforation, the second receiving tank can also serve as a receiving and buffer structure for gas production inside the electrode assembly, reducing the expansion of the battery cell and improving the reliability and stability of the battery cell.

[0055] In some embodiments, the second receiving tank has a second sinking groove, and the position where the conductive portion is electrically connected to the first pole is at least partially located in the second sinking groove.

[0056] In the above technical solution, by providing the second receiving groove with a second sink groove, the second sink groove can be used to achieve pre-positioning of the conductive part, which is beneficial for finding the correct position to achieve electrical connection and improve production efficiency.

[0057] In some embodiments, the housing assembly further includes a first cover plate, the first cover plate cooperates with the first pole and closes the notch of the second receiving groove, and the first cover plate is electrically connected to the first pole.

[0058] In the above technical solution, by providing a first cover plate to close the notch of the second receiving tank, the electrolyte in the shell can be prevented from leaking from the notch of the second receiving tank. Moreover, since the first cover plate closes the notch of the second receiving tank and is electrically connected to the first electrode, the first cover plate can be used to easily achieve indirect electrical connection between the first electrode and the busbar of the battery, and it is beneficial to increase the connection area of ​​the electrical connection, thereby helping to reduce the resistance of the electrical connection.

[0059] In some embodiments, the housing assembly further includes a second cover plate, which covers the first through-hole and the conductive portion located in the second receiving groove.

[0060] In the above technical solution, when the electrolyte enters the second containing tank from the first through-hole, the second cover plate can improve the problem of the electrolyte overflowing from the first pole, thereby improving the reliability of the battery cell.

[0061] In some embodiments, the battery cell further includes: a bracket located inside the shell and located on the side of the active material coating portion close to the first pole, the bracket having an avoidance hole for avoiding the conductive portion, and the conductive portion is suitable for extending to the side of the bracket away from the active material coating portion through the avoidance hole.

[0062] In the above technical solution, by setting an avoidance hole on the bracket, the conductive part can be guided and constrained to pass through the avoidance hole to cooperate with the first pole. This not only simplifies the arrangement of the conductive part, saves the material of the conductive part, and reduces the cost, but also supports and guides the conductive part to cooperate with the first pole through the bracket, which can reduce the risk of short-circuit connection between the conductive part and the active material coating part, thereby further improving the reliability of the battery cell.

[0063] In some embodiments, the bracket is provided with a guide portion, the guide portion surrounds at least a portion of the avoidance hole, and the guide portion at least partially extends to the accommodating portion.

[0064] In the above technical solution, since the bracket has a guide portion that at least partially extends into the accommodating portion, and at least a portion of the avoidance hole is formed by the guide portion, at least a portion of the conductive portion can be easily received in the accommodating portion, thereby improving the assembly efficiency of the conductive portion; at the same time, through the provision of the guide portion, the cooperation between the bracket and the pole, and between the bracket and the conductive portion are tighter and more reliable, making the structure of the battery cell more compact, which is more conducive to improving the energy density of the battery cell.

[0065] In some embodiments, the avoidance hole includes a first hole segment and a second hole segment, the second hole segment is located on the side of the first hole segment close to the active material coating portion, and the cross-sectional area of ​​the second hole segment gradually increases along the direction away from the first hole segment, the active material coating portion includes a current collector and an active material layer provided on the current collector, the conductive portion includes a pole ear portion electrically connected to the current collector, the pole ear portion includes a plurality of pole ear sheets, the plurality of pole ear sheets converge at a position close to the current collector to form a first gathering portion, the plurality of pole ear sheets converge and connect at a position away from the current collector to form a second gathering portion, the first gathering portion connects the second gathering portion and the active material coating portion, at least part of the first gathering portion is accommodated in the second hole segment, and the second gathering portion passes through the first hole segment.

[0066] In the above technical solution, by setting the avoidance hole to include a second hole segment that gradually expands in the direction of the active material coating portion, it is convenient for the second hole segment to accommodate more first folded portions, thereby improving the compactness of the fit between the bracket and the battery cell assembly, so that the overall volume of the battery cell is smaller, and the battery can accommodate a larger number of battery cells, thereby improving the volume energy density of the battery.

[0067] In some embodiments, the bracket is an integrated structure; or, the bracket is a split structure and includes a detachable first bracket and a detachable second bracket, and an avoidance hole is defined between the first bracket and the second bracket.

[0068] In the above technical solution, when the bracket is an integrated structure, the bracket is easy to process, has good reliability, and facilitates assembly of the bracket with the housing assembly, improving assembly efficiency and mating stability. When the bracket is a split structure, the first bracket and the second bracket cooperate to define an escape hole. When assembling the bracket with the battery cell assembly, there is no need to pass the conductive part from one end of the escape hole to the other. Instead, the first bracket and the second bracket can be spliced ​​together at the location of the conductive part to clamp the conductive part, so that the escape hole surrounds the conductive part, thereby facilitating assembly of the bracket with the battery cell assembly and improving assembly efficiency.

[0069] In some embodiments, the battery cell further includes: an inner insulating member, which is located inside the shell and wrapped around the active material coating portion, and is connected to the bracket.

[0070] In the above technical solution, on the one hand, by wrapping the inner insulating part outside the active material coating part, the insulation reliability between the active material coating part and the shell can be improved, the corrosion of the shell caused by the contact between the active material coating part and the shell can be reduced or prevented, and the leakage of electrolyte caused by shell corrosion can be reduced, thereby improving the reliability of the battery cell; on the other hand, connecting the inner insulating part to the bracket can reduce the difficulty of fixing the inner insulating part and improve the reliability of the inner insulating part wrapped outside the active material coating part.

[0071] In some embodiments, the housing assembly includes a plurality of poles, at least one of which is a first pole.

[0072] In the above technical solution, at least one of all the poles of the shell assembly is a first pole, so that a part of the entire battery cell can be a first pole with a receiving portion, or all of it can be a first pole with a receiving portion, so that it can be flexibly selected and matched according to actual needs such as energy density and cost to improve the applicability of the battery cell.

[0073] In some embodiments, the housing has a pressure relief portion, and the pressure relief portion and the first pole are located on the same side surface of the housing; or, the pressure relief portion and the first pole are located on two surfaces on different sides of the housing.

[0074] In the above technical solution, when the pole and the pressure relief part are arranged on the same side, processing and assembly are facilitated; and when the pole and the pressure relief part are arranged on different sides, space can be saved, the volume of the pole can be increased, and the adverse effects of the pressure relief part on the pole when releasing pressure can be reduced.

[0075] In some embodiments, the shell has a pressure relief portion, and the shell includes a shell body and a shell cover. One end of the shell body is open, the shell cover is arranged at the open end of the shell body, and the pressure relief portion is arranged on the shell cover.

[0076] In the above technical solution, the pressure relief part is easy to process and has good pressure relief reliability.

[0077] In a third aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0078] In the above technical solution, since the battery is provided with the above-mentioned battery cell, and the structure of the first pole of the battery cell includes the pole body, the first limit platform and the second limit platform, the first pole can be riveted to the shell, which facilitates the assembly of the first pole and the shell, simplifies the manufacturing process, and at the same time improves the reliability and stability of the connection between the first pole and the shell; at the same time, the pole body, the first limit platform and the second limit platform of the first pole are formed in one piece, which can not only save parts and costs, but also ensure the strength of the first pole, so that after the first pole is matched with the shell, it is not easy to separate from the shell due to vibration or external pulling during the charging and discharging process of the battery cell, nor is it easy to crack or be damaged due to vibration or external pulling, which can improve the stability and reliability of the battery cell, and thus improve the stability and reliability of the battery.

[0079] In a fourth aspect, an embodiment of the present application further provides an electrical device comprising the above-mentioned battery.

[0080] In the above technical solution, since the electric device is provided with the above-mentioned battery, the stability and reliability of the battery can be improved, thereby improving the working stability and reliability of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0082] FIG1 is a schematic diagram of an electrical device provided in some embodiments of the present application;

[0083] FIG2 is an exploded view of a battery provided in some embodiments of the present application;

[0084] FIG3 is a schematic diagram of a battery cell provided in some embodiments of the present application;

[0085] FIG4 is a schematic diagram of the battery cell shown in FIG3 ;

[0086] FIG5 is an orthographic view of the battery cell shown in FIG3 ;

[0087] FIG6 is a cross-sectional view along line AA in FIG5 ;

[0088] FIG7 is a cross-sectional view of a housing assembly provided in some embodiments of the present application;

[0089] FIG8 is a schematic diagram of the assembly of a first pole and a first wall provided in some embodiments of the present application;

[0090] FIG9 is another schematic diagram of the assembly of the first pole and the first wall shown in FIG6 ;

[0091] FIG10 is a schematic diagram of the assembly of the first pole and the first wall provided in some embodiments of the present application;

[0092] FIG11 is another schematic diagram of the assembly of the first pole and the first wall shown in FIG8 ;

[0093] FIG12 is a schematic diagram of the assembly of a first pole and a first wall provided in some embodiments of the present application;

[0094] FIG13 is another schematic diagram of the assembly of the first pole and the first wall shown in FIG10 ;

[0095] FIG14 is a schematic diagram of the assembly of the first pole and the first wall provided in some embodiments of the present application;

[0096] FIG15 is a schematic diagram of the assembly of the first pole and the first wall provided in some embodiments of the present application;

[0097] FIG16 is a cross-sectional view taken along line VV in FIG13;

[0098] FIG17 is a schematic diagram of the assembly of the first pole and the first wall provided in some embodiments of the present application;

[0099] FIG18 is another schematic diagram of the assembly of the first pole and the first wall shown in FIG15 ;

[0100] FIG19 is a cross-sectional view of a first pole and a first wall provided in some embodiments of the present application;

[0101] FIG20 is a cross-sectional view of a first pole and a first wall provided in some embodiments of the present application;

[0102] FIG21 is a schematic diagram of the assembly process of the first pole and the first wall provided in some embodiments of the present application;

[0103] FIG22 is a cross-sectional view of a first pole and a first wall provided in some embodiments of the present application;

[0104] FIG23 is a cross-sectional view of a first pole and a first wall provided in one embodiment of the present application;

[0105] FIG24 is a cross-sectional view of a first pole and a housing provided in some embodiments of the present application;

[0106] FIG25 is a cross-sectional view of a first pole and a housing provided in some embodiments of the present application;

[0107] FIG26 is a schematic diagram of a first pole provided in some embodiments of the present application;

[0108] FIG27 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0109] FIG28 is an assembly diagram of a second electrode, a battery cell assembly, and a housing provided in some embodiments of the present application;

[0110] FIG29 is a partial cross-sectional schematic diagram of a battery cell provided by some embodiments of the present application;

[0111] FIG30 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0112] FIG31 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0113] FIG32 is a partial cross-sectional schematic diagram of a battery cell assembly provided in some embodiments of the present application;

[0114] FIG33 is a diagram illustrating various tab folding schemes for battery cell assemblies provided in some embodiments of the present application;

[0115] FIG34 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0116] FIG35 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0117] FIG36 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0118] FIG37 is a partial cross-sectional schematic diagram of a battery cell provided by some embodiments of the present application;

[0119] FIG38 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0120] FIG39 is a partial enlarged view of the W portion of FIG3 ;

[0121] FIG40 is an orthographic projection view of various first poles provided in some embodiments of the present application;

[0122] FIG41 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0123] FIG42 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0124] FIG43 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0125] FIG44 is an exploded view of the structure of a battery cell provided by some embodiments of the present application;

[0126] FIG45 is a partial cross-sectional schematic diagram of a housing assembly provided in some embodiments of the present application;

[0127] FIG46 is an exploded view of the structure of the housing assembly shown in FIG45;

[0128] FIG47 is an exploded view of the structure of the first cover plate shown in FIG46;

[0129] FIG48 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0130] FIG49 is an exploded view of the structure of the battery cell shown in FIG48;

[0131] FIG50 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0132] FIG51 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0133] FIG52 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0134] FIG53 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0135] FIG54 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0136] FIG55 is a schematic diagram of the cooperation between a battery cell assembly and a bracket provided in some embodiments of the present application;

[0137] FIG56 is a cross-sectional view taken along line CC in FIG55;

[0138] FIG57 is a schematic structural diagram of an integrated bracket provided in some embodiments of the present application;

[0139] FIG58 is a schematic structural diagram of a split bracket provided in some embodiments of the present application;

[0140] FIG59 is a partial cross-sectional schematic diagram of a battery cell assembly and a bracket provided in some embodiments of the present application;

[0141] FIG60 is an exploded view of the structure of a battery cell assembly, a bracket, and a housing assembly provided in some embodiments of the present application;

[0142] FIG61 is an exploded view of the structure of the first pole, the housing, and the sealing gasket provided in some embodiments of the present application;

[0143] FIG62 is an assembly diagram of the first pole, housing, and sealing gasket shown in FIG61;

[0144] FIG63 is a schematic structural diagram of a first pole provided in some embodiments of the present application;

[0145] FIG64 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0146] FIG65 is a schematic cross-sectional view of a housing assembly provided in some embodiments of the present application;

[0147] FIG66 is a schematic cross-sectional view of a housing assembly provided in some embodiments of the present application;

[0148] FIG67 is an orthographic view of a battery cell provided by some embodiments of the present application;

[0149] FIG68 is a cross-sectional view taken along line EE in FIG67;

[0150] FIG69 is a partial cross-sectional schematic diagram of a battery cell provided by some embodiments of the present application;

[0151] FIG70 is an orthographic view of a battery cell provided by some embodiments of the present application;

[0152] FIG71 is a cross-sectional view taken along line UU in FIG79;

[0153] FIG72 is an enlarged view of the circled V portion in FIG71;

[0154] Figure 73 is a schematic structural diagram of the shell cover provided in some embodiments of the present application.

[0155] Reference Signs: Electric device 1000; Battery 100; Controller 200; Motor 300; First Direction X; Second Direction Y; Third Direction Z; Battery Cell 10; Housing 20; First Housing Portion 201; Second Housing Portion 202; Housing Assembly 1; Housing 11; First Wall 110; Second Wall 11b; First Matching Groove 11c, Matching Protrusion 11d; Second Matching Groove 11e; Housing 111; Housing Cover 112; Mounting Hole 113; First Post 12; Post Body 12a; First Limiting Platform 12b; Second Limiting Platform 12c; Accommodating Portion 121; First Accommodating Groove 12110; First End Wall 12111; First Concave Groove 12112; First Side Wall 12113; Second Accommodating Groove 12120; Second End Wall 12121; Second Concave Groove 12122; Second Side Wall 12123; First slot section 12124; second slot section 12125; guide slope 12126; stepped surface 12127; first through-hole 12130; third accommodating groove 12140; fourth accommodating groove 12150; second through-hole 12160; third through-hole 12170; pole inner end surface 122; pole outer end surface 123; first pole portion 124; second pole portion 125; first groove 126; spacer 127; stopper 1281; perforation portion 1282; flange portion 1283; first portion 1291; second portion 1292; first cover plate 13; first conductive member 131; second groove 1311; second conductive member 132; stress relief groove 133; second cover plate 14; second pole 15; pressure relief portion 16; liquid injection hole 17; avoidance groove 18; battery cell assembly 2; electrode assembly 2a; Active material coating portion 21; conductive portion 22; current collector 211; active material layer 212; pole ear portion 221; pole ear piece 2211; first gathering portion 2212; second gathering portion 2213; adapter piece 222; bracket 3; avoidance hole 31; first hole section 311; second hole section 312; guide portion 32; first bracket 33; second bracket 34; shell entry guide surface 35; main body portion 36; extension portion 37; inner insulator 4; second sealing member 6; slot cover 7; insulating sealing component 8; insulating member 81; first sealing member 82. DETAILED DESCRIPTION

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] The term "plurality" used in this application refers to two or more (including two).

[0162] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0163] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application can be a battery module or a battery pack. When the battery is a battery module, the battery module is composed of multiple battery cells. When the battery is a battery pack, the battery pack can be directly composed of a box and multiple battery cells disposed in the box, or the battery module can be first composed of battery cells and then the battery module is disposed in the box.

[0164] Specifically, a battery cell typically includes a housing, a cell assembly, and an electrolyte. The housing is used to hold the cell assembly and electrolyte, and is provided with at least one positive electrode post and at least one negative electrode post. The cell assembly includes one or more electrode assemblies, which are formed by stacking or winding positive and negative electrode sheets and a separator.

[0165] Among them, the positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. A plurality of positive electrode tabs are stacked together and electrically connected to the positive electrode column. For example, the plurality of stacked positive electrode tabs can be directly welded to the positive electrode column to form an electrical connection; alternatively, the battery cell assembly may further include a positive electrode adapter sheet, the plurality of stacked positive electrode tabs are welded to one end of the positive electrode adapter sheet, and the other end of the positive electrode adapter sheet is welded to the positive electrode column to form an electrical connection between the positive electrode tab sheet and the positive electrode column.

[0166] A negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. Multiple negative electrode tabs are stacked together and electrically connected to the negative electrode post. For example, the stacked multiple negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection. Alternatively, the battery cell assembly may further include a negative electrode adapter. The stacked multiple negative electrode tabs are welded to one end of the negative electrode adapter, and the other end of the negative electrode adapter is welded to the negative electrode post to form an electrical connection between the negative electrode tab and the negative electrode post.

[0167] The material of the isolation membrane is not limited, for example, it can be polypropylene or polyethylene. The shape of the shell is adjusted according to the type of battery cell. The type of battery cell in the embodiment of the present application is not limited. For example, when the battery cell is a square battery, the shell is square, and when the battery cell is a cylindrical battery, the shell is cylindrical. At the same time, the battery cell mainly relies on the movement of metal ions between the positive electrode plate and the negative electrode plate to work. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc., the material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. During the charge and discharge process, Li+ is intercalated and deintercalated back and forth between the two electrodes: during charging, Li+ is deintercalated from the positive electrode, and is intercalated into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge.

[0168] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, batteries, as the power source of electric vehicles, play an irreplaceable and important role. As core components of new energy vehicles, batteries have high requirements in terms of both energy density and reliability.

[0169] In the related art, the cell assembly of a battery cell is electrically connected to the pole so that the battery cell can be charged and discharged through the pole; however, due to limitations such as pole design, the pole is usually welded to the shell of the battery cell, which makes the installation process of the pole more complicated. In addition, due to the existence of welding defects, there is a risk that the pole may be easily separated from the shell during use of the battery cell, affecting the reliability of the battery cell.

[0170] In view of this, the present application provides a shell assembly, which includes a shell and a first pole, the shell is formed with a mounting hole, the first pole includes an integrally formed pole body, a first limit platform and a second limit platform, the pole body is passed through the mounting hole, the first limit platform and the second limit platform are arranged at both ends of the pole body along the axial direction of the mounting hole, and the first limit platform is limited and matched with the outer side of the shell, and the second limit platform is limited and matched with the inner side of the shell, so that the first pole is riveted to the shell.

[0171] In the shell assembly of the above structure, the structure of the first pole is provided to include a pole body, a first limit platform and a second limit platform, so that the first pole can be riveted to the shell, which facilitates the assembly of the first pole and the shell, simplifies the manufacturing process, and at the same time improves the reliability and stability of the connection between the first pole and the shell; moreover, the pole body, the first limit platform and the second limit platform are formed in one piece, which can not only save parts and costs, but also ensure the strength of the first pole, so that after the first pole is matched with the shell, it is not easy to separate from the shell due to vibration or external pulling during the charging and discharging process of the battery cell, nor is it easy to crack or be damaged due to vibration or external pulling, which can improve the stability and reliability of the battery cell.

[0172] The battery cells disclosed in the embodiments of this application utilize the aforementioned housing assembly, and the battery cells 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 disclosed in this application can be used to construct such electrical devices, thereby broadening the scope of application of the battery cells.

[0173] The present invention provides an electrical device that uses a battery cell as a power source. The electrical 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, and the like. 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, and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0174] The following embodiments take a vehicle as an example of an electrical device to describe in detail the housing assembly, battery cells, batteries, and electrical devices provided in the embodiments of the present application.

[0175] Please refer to Figure 1, which is a schematic structural diagram of a vehicle in which the power-consuming device 1000 provided in some embodiments of the present application is a vehicle. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle, and 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, and the battery 100 can be provided at the bottom, head, or tail of the vehicle. The battery 100 can be used to power the vehicle, for example, the battery 100 can be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle during driving. In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0176] Please refer to Figure 2, which is an exploded view of the structure of the battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a battery cell 10, and the battery cell 10 is accommodated in the housing 20. The housing 20 is used to provide an assembly space for the battery cell 10, and the housing 20 can adopt a variety of structures. In some embodiments, the housing 20 can include a first housing portion 201 and a second housing portion 202, and the first housing portion 201 and the second housing portion 202 cover each other, and the first housing portion 201 and the second housing portion 202 jointly define an assembly space for accommodating the battery cell 10. The second box portion 202 can be a hollow structure with one end open, and the first box portion 201 can be a plate-like structure, with the first box portion 201 covering the open side of the second box portion 202, so that the first box portion 201 and the second box portion 202 jointly define an assembly space; alternatively, the first box portion 201 and the second box portion 202 can also be hollow structures with one end open, with the open side of the first box portion 201 covering the open side of the second box portion 202. Of course, the box 20 formed by the first box portion 201 and the second box portion 202 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0177] In the battery 100, there are one or more battery cells 10. When there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 10 can be housed within the housing 20. Of course, the battery 100 can also be a battery pack composed of multiple battery cells 10 connected in series, in parallel, or in a hybrid connection, and then the battery packs are further connected in series, in parallel, or in a hybrid connection to form an entire battery, which is then housed within the housing 20. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 10.

[0178] Please refer to Figure 3, which is a schematic diagram of a battery cell 10 using a shell assembly 1 provided in some embodiments of the present application. The battery cell 10 is a rectangular parallelepiped, and the length direction of the battery cell is the first direction X, the thickness direction of the battery cell 10 is the second direction Y, and the height direction of the battery cell 10 is the third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. However, this is not limited to the above. In other embodiments of the present application, the battery cell 20 can also be a cylinder, a flat body, or other shapes. In detail, please refer to Figures 3 to 8 again. Figure 3 is a schematic diagram of a battery cell 10 provided in some embodiments of the present application, Figure 4 is a schematic diagram of the battery cell shown in Figure 3, Figure 7 is an orthographic view of the battery cell shown in Figure 3, and Figure 8 is a sectional view along line AA in Figure 7. In the embodiment of the present application, the battery cell 10 includes a cell assembly 2 and a shell assembly 1.

[0179] The housing assembly 1 includes a housing 11 and a first terminal 12. The housing 11 is formed with a mounting hole 113, and the first terminal 12 is disposed at the mounting hole 113 to facilitate electrical connection with the battery cell assembly 2. The housing 11 may have a first wall 110, which is formed with the mounting hole 113 and is provided with the first terminal 12. The axial direction of the mounting hole 113 is the third direction Z.

[0180] The shape of the shell 11 is adjusted according to the type of battery cell 10, and the type of battery cell 10 in the embodiments of the present application is not limited. For example, when the battery cell 10 is a square battery, the shell 11 is square. When the battery cell 10 is a cylindrical battery, the shell 11 is cylindrical. The embodiments of the present application are all described by taking the shell 11 as an example. The shell 11 is provided with a pole, which is used to electrically connect to the battery cell assembly 2 to ensure the normal charging and discharging operation of the battery cell 10. Generally, the number of poles is at least two, specifically at least one positive pole and at least one negative pole. For example, when the number of poles is two, one is a positive pole and the other is a negative pole, and the two are electrically connected to the positive and negative output positions of the battery cell assembly 2 respectively; for another example, when the number of poles is four, two can be positive poles and two can be negative poles. In this case, both positive poles are electrically connected to the positive output position of the battery cell assembly 2, and both negative poles are electrically connected to the negative output position of the battery cell assembly 2.

[0181] The battery cell assembly 2 includes an active material coating portion 21 and a conductive portion 22. The active material coating portion 21 is accommodated in the shell 11. The active material coating portion 21 is the portion of the battery cell assembly 2 coated with active material, which can assist in the deintercalation of metal ions during the charging and discharging process of the battery cell 10. The conductive portion 22 is a metal structure that electrically connects the active material coating portion 21 and the pole, which is not coated with active material. The conductive portion 22 is used to electrically connect the active material coating portion 21 and the first pole 12.

[0182] The active material coating portion 21 is divided into a positive electrode active material coating portion and a negative electrode active material coating portion. The positive electrode active material coating portion includes the portion of the positive electrode current collector coated with the positive electrode active material layer, while the negative electrode active material coating portion includes the portion of the negative electrode current collector coated with the negative electrode active material layer. The conductive portion 22 is divided into a positive electrode conductive portion and a negative electrode conductive portion. The positive electrode conductive portion electrically connects the positive electrode active material coating portion to the positive electrode post, while the negative electrode conductive portion electrically connects the negative electrode active material coating portion to the negative electrode post.

[0183] Please refer to Figure 7, which is a cross-sectional view of the shell assembly 1 provided in some embodiments of the present application. In the embodiments of the present application, the shell assembly 1 includes a shell 11 and a first pole 12. The shell 11 is formed with a mounting hole 113, and the first pole 12 is arranged at the mounting hole 113 to facilitate electrical connection with the conductive part 22 of the battery cell assembly 2. At the same time, the first pole 12 includes a pole body 12a, a first limiting platform 12b and a second limiting platform 12c. The pole body 12a, the first limiting platform 12b and the second limiting platform 12c are integrally formed, that is, the pole body 12a, the first limiting platform 12b and the second limiting platform 12c are an integrally formed part; the pole body 12a is passed through the mounting hole 113, and the first limiting platform 12b and the second limiting platform 12c are arranged at both ends of the pole body 12a along the axial direction of the mounting hole 113, and the first limiting platform 12b is limited to the outer side of the shell 11, and the second limiting platform 12c is limited to the inner side of the shell 11, so that the first pole 12 is riveted to the shell 11.

[0184] It can be seen that the first limiting platform 12b and the second limiting platform 12c respectively extend radially along the mounting hole 113 to the radially outer side of the peripheral wall of the mounting hole 113. The first limiting platform 12b and the second limiting platform 12c can limit the movement of the first pole 12 relative to the housing 11 along the axial direction of the mounting hole 113 (the third direction Z) relative to the housing 11, thereby making it easy for the first pole 12 to be reliably mounted at the mounting hole 113 through the first limiting platform 12b and the second limiting platform 12c, thereby achieving a fixed connection between the first pole 12 and the housing 11 and facilitating the assembly of the first pole 12 and the housing 11. At the same time, by riveting the first pole 12 to the housing 11, it is easy to achieve a reliable connection between the first pole 12 and the housing 11 without adopting other connection methods, which is conducive to simplifying the structure of the housing assembly 1 and simplifying the assembly process of the housing assembly 1.

[0185] Moreover, since the pole body 12a, the first limit platform 12b and the second limit platform 12c are formed as one piece, it can save parts and reduce costs. At the same time, it is convenient to ensure the strength of the first pole 12, so that after the first pole 12 is matched with the shell 11, it is not easy for the first pole 12 to separate from the shell 11 due to vibration or external pulling during the charging and discharging process of the battery cell 10, nor is it easy to crack or be damaged due to vibration or external pulling, which can improve the stability and reliability of the shell assembly 1, thereby improving the stability and reliability of the battery cell 10.

[0186] It should be noted that in the above technical solution, the housing assembly 1 may have one or more poles, at least one of which includes an integrally formed first pole 12. In other words, all poles on the housing 11 may include integrally formed first poles 12 riveted to the housing 11, or some of the poles on the housing 11 may include integrally formed first poles 12 riveted to the housing 11, while the remaining poles may have other non-integrally formed structures.

[0187] In some embodiments of the present application, referring to Figures 7 and 8, Figure 8 is an assembly diagram of the first pole and the first wall provided in some embodiments of the present application, with the cross-section of the mounting hole 113 as the projection surface Ω, and the axial direction Z of the mounting hole 113 as the projection direction, at least a portion of the circumferential profile R1 of the projection of the first limit platform 12b on the projection surface Ω is a straight line (also referred to as a straight line segment); at least a portion of the circumferential profile R2 of the projection of the second limit platform 12c on the projection surface Ω is a straight line (also referred to as a straight line segment).

[0188] Specifically, referring to Figures 7 and 8, the surface shown by the dotted line in Figure 7 is the projection surface Ω, which is perpendicular to the axial direction Z of the mounting hole 113. The first limit platform 12b and the second limit platform 12c can be located on both sides of the projection surface Ω in the axial direction Z, respectively. Then, at least a portion of the circumferential profile R1 of the first limit platform 12b projected on the projection surface Ω and along the direction Z1 is a straight line, and at least a portion of the circumferential profile R2 of the second limit platform 12c projected on the projection surface Ω and along the direction Z2 is a straight line. Wherein, both direction Z1 and direction Z2 are parallel to the axial direction Z, and direction Z1 is opposite to direction Z2. Of course, in other embodiments of the present application, at least a portion of the circumferential profile of the projection of either the first limit platform 12b or the second limit platform 12c can be a straight line, and this embodiment does not limit this.

[0189] It is understood that the circumferential profile R1 of the projection of the first limiting platform 12b on the projection plane Ω can be understood as the outer contour of the projection of the first limiting platform 12b on the projection plane Ω, and this outer contour is a closed contour line. The circumferential profile R2 of the projection of the second limiting platform 12c on the projection plane Ω can be understood as the outer contour of the projection of the second limiting platform 12c on the projection plane Ω, and this outer contour is also a closed contour line. The term "closed contour line" should be understood in a broad sense, and can refer to a curve that is connected end to end.

[0190] If at least a portion of the circumferential profile R1 of the projection of the first limiting platform 12b on the projection surface Ω is a straight line, the circumferential profile R1 may be composed of a combination of multiple straight lines, or the circumferential profile R1 may be composed of a combination of straight lines and curves; wherein, the number of straight lines included in the circumferential profile R1 of the projection of the first limiting platform 12b on the projection surface Ω may be one or more. Similarly, if at least a portion of the circumferential profile R2 of the projection of the second limiting platform 12c on the projection surface Ω is a straight line, the circumferential profile R2 may be composed of a combination of multiple straight lines (e.g., a polygon, etc.), or the circumferential profile R2 may be composed of a combination of straight lines and curves (the curves may include at least one of a circular arc, an elliptical arc, a hyperbola, and a parabola, etc.); wherein, the number of straight lines included in the circumferential profile R2 of the projection of the second limiting platform 12c on the projection surface Ω may be one or more.

[0191] Alternatively, in the examples of Figures 7-11 and 15-18, the outer peripheral wall of the first limiting platform 12b is formed as a cylindrical surface, at least a portion of which is flat; and / or the outer peripheral wall of the second limiting platform 12c is formed as a cylindrical surface, at least a portion of which is flat. Of course, the shapes of the outer peripheral walls of the first limiting platform 12b and the second limiting platform 12c are not limited to these.

[0192] In the above technical solution, since the first limit platform 12b and the second limit platform 12c are the parts that are riveted to the shell 11 after the axial ends of the first pole 12 are flanged, the first limit platform 12b and the second limit platform 12c rivet the first pole 12 to the shell 11. By setting at least a part of the circumferential contour R1 of the projection of the first limit platform 12b on the projection plane Ω to be a straight line, and setting at least a part of the circumferential contour R2 of the projection of the second limit platform 12c on the projection plane Ω to be a straight line, the part of the first limit platform 12b corresponding to the straight line projection contour and the part of the second limit platform 12c corresponding to the straight line projection contour are subjected to less pulling than the curved part, so that the first limit platform 12b and / or the second limit platform 12c are not easy to crack after the first pole 12 is riveted, which is convenient for ensuring the strength of the first pole 12, improving the reliability and stability of the first pole 12, and thus further improving the reliability and stability of the battery cell 10. At the same time, when at least a portion of the first and second limiting platforms 12b, 12c are linear, they can adapt to the sheet-like conductive portion 22, allowing the conductive portion 22 to fully utilize the space of the first terminal 12, thereby fully improving the space utilization of the first terminal 12 and ensuring the energy density and fast charging performance of the battery cell 10. Furthermore, the outer contours of the first and second limiting platforms 12b, 12c are simplified, reducing the difficulty of manufacturing the first and second limiting platforms 12b, 12c.

[0193] In some embodiments of the present application, referring to Figures 12-14, with the cross-section of the mounting hole 113 as the projection surface Ω and the axial direction Z of the mounting hole 113 as the projection direction, the circumferential profile R1 of the projection of the first limit platform 12b on the projection surface Ω is composed of one or more curves.

[0194] For example, in the examples of Figures 7, 12-14, taking the axial direction of the mounting hole 113 as the third direction Z as an example, the plane where the cross section of the mounting hole 113 is located is the projection plane Ω, the projection plane Ω is perpendicular to the third direction Z, and the first limit platform 12b is projected onto the projection plane Ω along the third direction Z, and the circumferential profile R1 of the projection of the first limit platform 12b on the projection plane Ω is only composed of curves, and the dimension L1 of the circumferential profile R1 in the first direction X is greater than its dimension L2 in the second direction Y, for example, the circumferential profile R1 can be an ellipse; and / or, the second limit platform 12c is projected onto the projection plane Ω along the third direction Z, and the circumferential profile R2 of the projection of the second limit platform 12c on the projection plane Ω is only composed of curves, and the dimension L3 of the circumferential profile R2 in the first direction X is greater than its dimension L4 in the second direction Y, for example, the circumferential profile R2 can be an ellipse.

[0195] In some embodiments of the present application, referring to Figures 7 to 11 and Figures 15 to 18, with the cross section of the mounting hole 113 as the projection surface Ω and the axial direction Z of the mounting hole 113 as the projection direction, the circumferential profile R1 of the projection of the first limit platform 12b on the projection surface Ω is composed of a combination of straight lines and arcs; and / or, the circumferential profile R2 of the projection of the second limit platform 12c on the projection surface Ω is composed of a combination of straight lines and arcs.

[0196] It is understood that for the first limiting platform 12b, the circumferential profile R1 projected on the projection surface Ω includes one or more straight lines and one or more arcs, and the number of straight lines and the number of arcs are equal or unequal. For the second limiting platform 12c, the circumferential profile R2 projected on the projection surface Ω includes one or more straight lines and one or more arcs, and the number of straight lines and the number of arcs are equal or unequal. Adjacent straight lines and arcs in the circumferential profiles R1 and R2 may be tangent or intersecting.

[0197] For example, taking the circumferential profile R1 projected by the first limiting platform 12b on the projection surface Ω as an example, circumferential profile R1 can be composed of a combination of a straight line and an arc, for example, the shape enclosed by circumferential profile R1 is an arc; alternatively, circumferential profile R1 can be composed of a combination of two straight lines and an arc, for example, the shape enclosed by circumferential profile R1 is a fan; alternatively, circumferential profile R1 can be composed of a combination of three straight lines and an arc, for example, the shape enclosed by circumferential profile R1 is a combination of a semicircle and a square. The circumferential profile R2 projected by the second limiting platform 12c on the projection surface Ω is not further described herein.

[0198] In the above technical solution, since the first limit platform 12b and the second limit platform 12c are the parts that are riveted to the shell 11 after the axial ends of the first pole 12 are flanged, the first limit platform 12b and the second limit platform 12c rivet the first pole 12 to the shell 11, and the circumferential contour R1 of the projection of the first limit platform 12b on the projection plane Ω is set to be composed of a combination of straight lines and arcs, and / or the circumferential contour R2 of the projection of the second limit platform 12c on the projection plane Ω is set to be composed of a combination of straight lines and arcs, the part of the first limit platform 12b corresponding to the straight line projection contour and / or the part of the second limit platform 12c corresponding to the straight line projection contour are subjected to less pulling than the curved part, so that the first limit platform 12b and / or the second limit platform 12c are not easy to crack after the first pole 12 is riveted, which is convenient for ensuring the strength of the first pole 12, improving the reliability and stability of the first pole 12, and thus further improving the reliability and stability of the battery cell 10. Moreover, the arc-shaped portion of the projected contour corresponding to the first limit platform 12b and / or the arc-shaped portion of the projected contour corresponding to the second limit platform 12c can improve the smoothness of riveting the first pole 12 to the shell 11, and can also be used as a transition between the straight line portion and the arc-shaped portion to further ensure the strength of the first pole 12, thereby further improving the reliability and stability of the battery cell 10.

[0199] In some embodiments of the present application, as shown in Figures 7, 10, 11, and 15, with the cross-section of the mounting hole 113 as the projection surface Ω and the axial direction Z of the mounting hole 113 as the projection direction, the circumferential profile R1 of the projection of the first limit platform 12b on the projection surface Ω includes two straight lines and two arcs, the two straight lines are opposite and spaced apart, and the opposite ends of the two straight lines are respectively connected by an arc; the circumferential profile R2 of the projection of the second limit platform 12c on the projection surface Ω includes two straight lines and two arcs, the two straight lines are opposite and spaced apart, and the opposite ends of the two straight lines are respectively connected by an arc. Of course, in other embodiments, it is also possible that only the circumferential profile of the projection of the first limit platform 12b or the second limit platform 12c on the projection surface Ω includes two straight lines and two arcs, and this embodiment is not limited thereto.

[0200] For example, referring again to FIG. 11 , taking the circumferential profile R1 projected by the first limiting platform 12b onto the projection surface Ω as an example, circumferential profile R1 can be composed of two straight lines and two arcs. The two straight lines are arranged parallel and spaced apart, and their ends are aligned, i.e., the two straight lines are of equal length, one end of one straight line is connected to one end of the other straight line via an arc, and the other end of the one straight line is connected to the other end of the other straight line via another arc, so that circumferential profile R1 forms a closed curve in the shape of a racetrack. Optionally, the radii of the two arcs are equal, and each straight line is tangent to each arc, so that circumferential profile R1 forms a racetrack. Of course, the two straight lines can also be arranged non-parallel; the lengths of the two straight lines can also be unequal; the radii of the two arcs can also be unequal; and each straight line intersects with an arc.

[0201] It is understandable that the circumferential profile R2 of the second limiting platform 12c projected on the projection surface Ω can also be formed into the above-mentioned shape, which will not be described in detail here.

[0202] In the above technical solution, by setting the circumferential contours of the projections of the first limit platform 12b and the second limit platform 12c on the projection surface Ω to include two straight lines and two arcs respectively, it is convenient to make the part of the projection contour corresponding to the first limit platform 12b as a straight line and the part of the projection contour corresponding to the first limit platform 12b as a curve have an appropriate proportion, so that the part of the projection contour corresponding to the second limit platform 12c as a straight line and the part of the projection contour corresponding to the second limit platform 12c as a curve have an appropriate proportion, which is conducive to further taking into account the strength of the first pole 12 and the smoothness of riveting, thereby improving the reliability and stability of the battery cell 10.

[0203] It can be seen that in the embodiment of the present application, as shown in Figures 8 to 18, the circumferential profile R1 of the projection of the first limit platform 12b on the projection surface Ω can be a polygon, a circle, an ellipse, or a shape formed by a combination of straight lines and arcs; the circumferential profile of the projection of the pole body 12a on the projection surface Ω can be a polygon, a circle, an ellipse, or a shape formed by a combination of straight lines and arcs; the circumferential profile R2 of the projection of the second limit platform 12c on the projection surface Ω is a polygon, a circle, an ellipse, or a shape formed by a combination of straight lines and arcs.

[0204] It can be understood that the shapes of the circumferential profile R1 of the projection of the first limiting platform 12b on the projection plane Ω, the circumferential profile of the projection of the pole body 12a on the projection plane Ω and the circumferential profile R2 of the projection of the second limiting platform 12c on the projection plane Ω can be the same or different.

[0205] In the above technical solution, polygons can be understood in a broad sense, and the corners of the polygons can be sharp or rounded.

[0206] In some embodiments of the present application, as shown in Figures 8-18 , with the cross-section of the mounting hole 113 as the projection plane Ω and the axial direction Z of the mounting hole 113 as the projection direction, the dimension L1 of the projection of the first limiting platform 12b on the projection plane Ω in the first direction X is greater than the dimension L2 of the projection of the first limiting platform 12b on the projection plane Ω in the second direction Y; and the dimension L3 of the projection of the second limiting platform 12c on the projection plane Ω in the first direction X is greater than the dimension L4 of the projection of the second limiting platform 12c on the projection plane Ω in the second direction Y. The first direction X, the second direction Y, and the axial direction are mutually perpendicular. Of course, in other embodiments, only one of the conditions L1>L2 and L3>L4 may be satisfied, and this embodiment is not limited thereto.

[0207] Among them, the dimension L1 of the projection of the first limit platform 12b on the projection plane Ω in the first direction X can be understood as the maximum dimension of the projection of the first limit platform 12b on the projection plane Ω in the first direction X; the dimension L2 of the projection of the first limit platform 12b on the projection plane Ω in the second direction Y can be understood as the maximum dimension of the projection of the first limit platform 12b on the projection plane Ω in the second direction Y; the dimension L3 of the projection of the second limit platform 12c on the projection plane Ω in the first direction X can be understood as the maximum dimension of the projection of the second limit platform 12c on the projection plane Ω in the first direction X; the dimension L4 of the projection of the second limit platform 12c on the projection plane Ω in the second direction Y can be understood as the maximum dimension of the projection of the second limit platform 12c on the projection plane Ω in the second direction Y.

[0208] In the above technical solution, by setting the dimension L1 of the projection of the first limit platform 12b on the projection plane Ω in the first direction X to be greater than the dimension L' of the first pole 12 in the second direction Y, and setting the dimension L3 of the projection of the second limit platform 12c on the projection plane Ω in the first direction X to be greater than the dimension L' of the first pole 12 in the second direction Y, the first limit platform 12b and the second limit platform 12c can be made into a long strip shape, which can increase the matching length of the first pole 12 and the shell 11, and increase the riveting length of the first pole 12 and the shell 11, thereby improving the stability and reliability of the riveting of the first pole 12 and the shell 11, thereby further improving the stability and reliability of the battery cell 10.

[0209] It can be understood that in the above technical solution of the present application, with the cross section of the mounting hole 113 as the projection surface Ω and the axial direction Z of the mounting hole 113 as the projection direction, the projection shape of the first limit platform 12b on the projection surface Ω and the projection shape of the second limit platform 12c on the projection surface Ω may be the same or different.

[0210] In some embodiments of the present application, as shown in Figures 8 to 18, the dimension L1 of the projection of the first limiting platform 12b on the projection plane Ω in the first direction is greater than three times the dimension L2 of the projection of the first limiting platform 12b on the projection plane Ω in the second direction; the dimension L3 of the projection of the second limiting platform 12c on the projection plane Ω in the first direction is greater than three times the dimension L4 of the projection of the second limiting platform 12c on the projection plane Ω in the second direction. Wherein, the cross section of the first pole 12 is parallel to the cross section of the mounting hole 113, and the projection plane Ω can also be used as the cross section of the first pole 12. Of course, in other embodiments, only one of the conditions of L1>3*L2 and L3>3*L4 may be satisfied, and this embodiment does not limit this.

[0211] Optionally, L1 can be 3*L2, 3.3*L2, 3.5*L2, 3.8*L2, or 4*L2, etc.; L3 can be 3*L3, 3.2*L3, 3.5*L3, 3.9*L3, or 4*L3, etc.

[0212] In the above technical solution, by ensuring that the size of the projection of the first limiting platform 12b and / or the second limiting platform 12c on the projection plane Ω in the first direction X is greater than or equal to three times the size of the projection of the first limiting platform 12b and / or the second limiting platform 12c on the projection plane Ω in the second direction Y is greater than or equal to three times the size of the projection of the first limiting platform 12 on the projection plane Ω in the second direction Y, it can be applicable to the situation where the wall of the shell 11 on which the first pole 12 is provided is relatively long in the first direction X, and the size of the wall of the shell on which the first pole 12 is provided can be fully utilized, that is, the area provided by the above-mentioned wall on which the first pole 12 can be provided can be fully utilized, so as to increase the riveting area of ​​the first pole 12 and the shell 11, and increase the riveting strength of the first pole 12 and the shell 11, thereby further improving the stability and reliability of the battery cell 10.

[0213] In addition, the above-mentioned setting of the first pole 12 also facilitates increasing the cross-sectional area of ​​the first pole 12 within the limited arrangement area on the corresponding wall of the shell 11, making it convenient to construct the first pole 12 into a "super large pole structure", which is beneficial to further increase the flow area, flow capacity and heat diffusion capacity of the first pole 12 to ensure the fast charging performance of the battery cell 10.

[0214] Obviously, in the above technical solution, the first pole 12 is long and narrow, which is particularly suitable for the battery cell 10 with a thin structure, and is conducive to improving the structural compactness of the battery cell 10.

[0215] In some embodiments of the present application, as shown in FIG3 and FIG4 , the first direction X is the length direction of the first wall 110 , the second direction Y is the width direction of the first wall 110 , and the length a0 of the first wall 110 is greater than the width b0 of the first wall 110 .

[0216] In the above technical solution, by setting the first direction X as the length direction of the first wall 110 and the second direction Y as the width direction of the first wall 110, it is convenient to make the length direction of the first wall 110 consistent with the length direction of the cross section of the first limit platform 12b, the width direction of the first wall 110 can be consistent with the width direction of the cross section of the first limit platform 12b, and / or, the length direction of the first wall 110 is consistent with the length direction of the cross section of the second limit platform 12c, and the width direction of the first wall 110 can be consistent with the width direction of the cross section of the second limit platform 12c, so as to effectively make the first wall 110 and the first pole 12 on the first wall 110 achieve good matching in both the first direction X and the second direction Y, so that the first pole 12 on the first wall 110 can further make full use of the layout area provided by the first wall 110, thereby increasing the riveting area of ​​the first pole 12 and the shell 11, and increasing the riveting strength of the first pole 12 and the shell 11, thereby improving the reliability and stability of the battery cell 10.

[0217] For example, a plurality of first poles 12 may be provided on the first wall 110. The plurality of first poles 12 may be spaced apart along a first direction X, such that the arrangement direction of the plurality of first poles 12 matches the length direction of the first wall 110. The length and width of the first wall 110 may satisfy the requirement that the size of the plurality of first poles 12 in the first direction X is greater than the size in the second direction Y, and facilitates ensuring a suitable spacing between two adjacent first poles 12. For another example, the plurality of first poles 12 on the first wall 110 may be spaced apart along both the first direction X and the second direction Y. In this case, the plurality of first poles 12 spaced apart along the first direction X constitute a pole group, and the pole groups may be multiple groups, each of which is spaced apart along the second direction Y. This also allows the arrangement of the plurality of first poles 12 to match the first wall 110 in both the first direction X and the second direction Y. Of course, a single first pole 12 may also be provided on the first wall 110.

[0218] In some embodiments of the present application, as shown in FIG7 to FIG9 , the length dimension L5 of the pole body 12a in the first direction X is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X, for example, L5 can be a0 / 3, 2*a0 / 5, or 9*a0 / 20, etc.; the width dimension L6 of the pole body 12a in the second direction Y is greater than or equal to 1 / 4 of the width dimension b0 of the first wall 110 in the second direction Y, for example, L6 can be b0 / 4, b0 / 3, or 2*b0 / 5, etc.; the pole body The cross-sectional area of ​​the portion of the pole body 12a that fits in the mounting hole 113 is greater than or equal to 4% of the area of ​​the first wall 110. For example, the cross-sectional area of ​​the portion of the pole body 12a that fits in the mounting hole 113 may be 4%, 4.5%, 5%, or 5.4% of the area of ​​the first wall 110. Along the axial direction Z of the mounting hole 113, the ratio of the thickness dimension t of the pole body 12a to the thickness dimension t0 of the first wall 110 is greater than 1 and less than 1.5. For example, the ratio is 1.1, 1.15, 1.2, 1.3, 1.35, or 1.4. It will be understood that in other embodiments, only some of the above conditions may be met, and this embodiment is not limited thereto.

[0219] In the above technical solution, when at least one of the ratio of the length of the pole body 12a to the length of the first wall 110 and the ratio of the width of the pole body 12a to the width of the first wall 110 satisfies the above corresponding range, the pole body 12a accounts for a large proportion in the length direction and the width direction of the first wall 110, and the size of the matching portion of the pole body 12a and the mounting hole 113 is large, which can improve the stability of the riveting between the first pole 12 and the first wall 110, ensure the riveting strength of the first pole 12, and thus improve the reliability and stability of the battery cell 10; when the cross-sectional area of ​​the pole body 12a is When the area ratio of the first pole body 12a to the first wall 110 is within the above range, the flow area of ​​the first pole 12 is large, which can improve the flow and fast charging capabilities of the first pole 12 and is conducive to increasing the thermal diffusion capacity of the first pole 12; when the thickness ratio of the pole body 12a to the thickness of the first wall 110 meets the above corresponding range, it is convenient for the pole body 12a to be reliably matched with the mounting hole 113, so that the first limit platform 12b and the second limit platform 12c are respectively located on the inner and outer sides of the shell 11, so as to achieve smooth riveting of the first pole 12 and improve the riveting convenience and reliability. At the same time, when all parameters of the pole body 12a are within the above range, the number of first poles 12 of the same polarity on the first wall 110 can be one or more, in particular, two, and the two first poles 12 are arranged at intervals along the second direction Y. Of course, the number of first poles 12 of the same polarity can also be four.

[0220] It can be understood that in the embodiment of the present application, the area S0 of the first wall 110 can be understood as the projected area of ​​the first wall 110 on the projection surface Ω. For example, the first wall 110 is roughly formed into a rectangular structure, and the area S0 of the first wall 110 can be simply understood as (a0*b0-the opening area of ​​all mounting holes 113 on the first wall 110); the thickness dimension t0 of the first wall 110 can be understood as the thickness of the edge portion of the first wall 110 surrounding the mounting hole 113.

[0221] Optionally, the cross-sectional area of ​​the portion of the pole body 12 a that cooperates with the mounting hole 113 is greater than or equal to 5.8% of the area of ​​the first wall 110. For example, the cross-sectional area of ​​the portion of the pole body 12 a that cooperates with the mounting hole 113 is 5.8%, 6%, 6.6%, 7%, or 8.6% of the area of ​​the first wall 110, etc., so as to further ensure the riveting strength between the first pole 12 and the housing 11.

[0222] Optionally, the length L5 of the pole body 12a in the first direction X is greater than or equal to 40 mm, for example, L5 can be 45 mm, 48 mm, 50 mm, or 55 mm; the width L6 of the pole body 12a in the second direction Y is greater than or equal to 7.5 mm, for example, L5 can be 7.5 mm, 8 mm, 8.2 mm, 8.5 mm, or 9 mm; the cross-sectional area of ​​the portion of the pole body 12a that fits the mounting hole 113 is greater than or equal to 600 mm. 2 For example, the cross-sectional area of ​​the portion where the pole body 12a fits in the mounting hole 113 is 600 mm. 2 , 640mm 2 , 660mm 2 , or 700mm 2 wait.

[0223] For example, in the examples of Figures 14 to 18, four mounting holes 113 are formed on the first wall 110, and four first poles 12 are respectively provided in the four mounting holes 113, that is, each mounting hole 113 can be provided with a first pole 12, and the four first poles 12 have the same polarity. Then, two of the first poles 12 are positive poles, and the other two first poles 12 are negative poles; wherein, each first pole 12 satisfies at least one of the following conditions: the length L5 of the pole body 12a in the first direction X is greater than or equal to the first pole body 12a; The length dimension a0 of the wall 110 in the first direction X is 1 / 3; the width dimension L6 of the pole body 12a in the second direction Y is greater than or equal to 1 / 4 of the width dimension b0 of the first wall 110 in the second direction Y; the cross-sectional area of ​​the portion of the pole body 12a that cooperates with the mounting hole 113 is greater than or equal to 4% of the area of ​​the first wall 110; along the axial direction Z of the mounting hole 113, the thickness dimension t of the pole body 12a is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110 and less than or equal to 1.5 of the thickness of the first wall.

[0224] In some embodiments of the present application, as shown in Figures 7 to 9, the length L5 of the pole body 12a in the first direction X is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X, for example, L5 can be a0 / 3, 0.35*a0, or 0.42*a0, etc.; the width dimension L6 of the pole body 12a in the second direction Y is greater than or equal to 1 / 2 of the width dimension b0 of the first wall 110 in the second direction Y, for example, L6 can be b0 / 2, 0.55*b0, or 0.6*b0, or 0.68*b0, etc.; the circumference of the circumference of the pole body 12a and the mounting hole 113 is greater than or equal to 25% of the circumference of the first wall 110, for example, ... The circumferential length of the first wall 110 in the circumferential direction of the mounting hole 113 may be 25%, 25.8%, 26%, or 26.6% of the circumference of the first wall 110; the cross-sectional area of ​​the portion of the pole body 12a that fits the mounting hole 113 is greater than or equal to 10% of the area of ​​the first wall 110, for example, the cross-sectional area of ​​the portion of the pole body 12a that fits the mounting hole 113 may be 10%, 10.6%, 11%, 11.5%, or 12% of the area of ​​the first wall 110; and along the axial direction Z of the mounting hole 113, the ratio of the thickness dimension t of the pole body 12a to the thickness dimension t0 of the first wall 110 is greater than 1 and less than 1.5, for example, the ratio is 1.1, 1.15, 1.2, 1.3, 1.35, or 1.4. It will be understood that in other embodiments, only some of the above conditions may be met, and this embodiment is not limited thereto.

[0225] In the above technical solution, when at least one of the ratio of the length of the pole body 12a to the length of the first wall 110, the ratio of the width of the pole body 12a to the width of the first wall 110, and the ratio of the circumference of the pole body 12a and the mounting hole 113 to the circumference of the first wall 110 meets the above corresponding range, the pole body 12a accounts for a large proportion in the length direction and width direction of the first wall 110, and the size of the matching portion of the pole body 12a and the mounting hole 113 is large, the stability of the riveting between the first pole 12 and the first wall 110 can be improved, the riveting strength of the first pole 12 can be ensured, and the battery cell can be improved. The reliability and stability of the body 10; when the ratio of the cross-sectional area of ​​the pole body 12a to the area of ​​the first wall 110 is within the above range, the flow area of ​​the first pole 12 is large, which can improve the flow and fast charging capabilities of the first pole 12; when the thickness of the pole body 12a to the thickness of the first wall 110 meets the above corresponding range, it is convenient for the pole body 12a to be reliably matched with the mounting hole 113, so that the first limit platform 12b and the second limit platform 12c are respectively located on the inner and outer sides of the shell 11, so as to achieve smooth riveting of the first pole 12, improve the riveting convenience and riveting reliability. At the same time, when all parameters of the pole body 12a are within the above range, the number of first poles 12 of the same polarity on the first wall 110 can be one or more, in particular, two, and the two first poles 12 are arranged at intervals along the second direction Y. Of course, the number of first poles 12 of the same polarity can also be four.

[0226] It can be understood that in the embodiment of the present application, the perimeter of the first wall 110 can be understood as the perimeter of the outer contour of the projection of the first wall 110 on the projection surface Ω. For example, the first wall 110 is roughly formed into a rectangular structure, and the outer contour of the projection of the first wall 110 on the projection surface Ω is also roughly a rectangular structure. The perimeter of the first wall 110 can be simply understood as (2*a0+2*b0).

[0227] Optionally, the circumference of the circumference of the pole body 12a and the mounting hole 113 is greater than or equal to 26.5% of the circumference of the first wall 110. For example, the circumference of the circumference of the pole body 12a and the mounting hole 113 is 26.5%, 27%, 27.2%, 27.7%, or 28% of the circumference of the first wall 110, so as to further ensure the riveting matching length of the first pole 12 and the housing 11 and improve the riveting reliability.

[0228] Optionally, the circumference of the pole body 12a and the mounting hole 113 is less than or equal to 40% of the circumference of the first wall 110, so as to improve the reliability of the riveting between the first pole 12 and the housing 11 while taking into account the reliability of the first wall 110.

[0229] Optionally, the cross-sectional area of ​​the portion where the pole body 12a cooperates with the mounting hole 113 is greater than or equal to 11.6% of the area of ​​the first wall 110. For example, the cross-sectional area of ​​the portion where the pole body 12a cooperates with the mounting hole 113 is 11.6%, 12%, 12.4%, 12.7%, or 13.8% of the area of ​​the first wall 110, etc., so as to further ensure the riveting cooperation area between the first pole 12 and the housing 11 and improve the riveting reliability.

[0230] Optionally, the length L5 of the pole body 12a in the first direction X is greater than or equal to 40 mm, for example, L5 can be 40 mm, 43 mm, 46 mm, 50 mm, or 52 mm; the width L6 of the pole body 12a in the second direction Y is greater than or equal to 15 mm, for example, L5 can be 15 mm, 15.5 mm, 16 mm, 16.2 mm, or 17 mm; the cross-sectional area of ​​the portion of the pole body 12a that cooperates with the mounting hole 113 is greater than or equal to 600 mm. 2 For example, the cross-sectional area of ​​the portion where the pole body 12a fits in the mounting hole 113 is 600 mm. 2 , 630mm 2 , 680mm 2 , or 700mm 2 wait.

[0231] For example, in the examples of Figures 8 to 13, two mounting holes 113 are formed on the first wall 110, and each mounting hole 113 is respectively provided with a first pole 12, and the polarities of the two first poles 12 are opposite; wherein each first pole 12 satisfies at least one of the following conditions: the length L5 of the pole body 12a in the first direction X is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X; the width dimension L6 of the pole body 12a in the second direction Y is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X; The thickness of the pole body 12a is greater than or equal to 1 / 2 of the width dimension b0 of the first wall 110 in the second direction Y; the circumference of the circumference of the pole body 12a and the mounting hole 113 is greater than or equal to 25% of the circumference of the first wall 110; the cross-sectional area of ​​the portion of the pole body 12a that cooperates with the mounting hole 113 is greater than or equal to 10% of the area of ​​the first wall 110; along the axial direction Z of the mounting hole 113, the ratio of the thickness dimension t of the pole body 12a to the thickness dimension t0 of the first wall 110 is greater than 1 and less than 1.5.

[0232] In some embodiments of the present application, as shown in Figures 7 to 9, the length dimension L1 of the first limiting platform 12b in the first direction X is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X, for example, L1 can be a0 / 3, 0.36*a0, 0.41*a0, or 0.44*a0, etc.; the width dimension L2 of the first limiting platform 12b in the second direction Y is greater than or equal to 1 / 4 of the width dimension b0 of the first wall 110 in the second direction Y, for example, L2 can be 0.25*b0, 0.3*b0, or 0.34*b0, or 0.4*b0, etc.; the cross-sectional area of ​​the first limiting platform 12b is greater than or equal to 4.5% of the area of ​​the first wall 110, for example, the cross-sectional area S1 of the first limiting platform 12b is 4.5%, 4.8%, 5%, 6%, or 8% of the area S0 of the first wall 110, and the cross-sectional area of ​​the first limiting platform 12b is perpendicular to the axial direction Z of the mounting hole 113; along the axial direction Z of the mounting hole 113, the thickness dimension t1 of the first limiting platform 12b is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110, and t1 is less than or equal to 1.5 of the thickness dimension t0 of the first wall 110, for example, t1 can be 0.6*t0, 0.7*t0, 0.8*t0, 1*t0, 1.3*t0, or 1.5*t0, etc. It is understandable that in other embodiments, only some of the above conditions may be met, and this embodiment is not limited thereto.

[0233] In the above technical solution, when at least one of the ratio of the length of the first limiting platform 12b to the length of the first wall 110 and the ratio of the width of the first limiting platform 12b to the width of the first wall 110 meets the above corresponding range, the first limiting platform 12b accounts for a large proportion in the length direction and the width direction of the first wall 110, and the size of the matching portion of the first limiting platform 12b and the mounting hole 113 is large, which can improve the stability of the riveting between the first terminal 12 and the first wall 110, ensure the riveting strength of the first terminal 12, and thus improve the reliability and stability of the battery cell 10; when the first limiting platform 12 When the ratio of the cross-sectional area of ​​b to the area of ​​the first wall 110 is within the above range, the flow area of ​​the first pole 12 is large, which can improve the flow and fast charging capabilities of the first pole 12; when the ratio of the thickness of the first limiting platform 12b to the thickness of the first wall 110 meets the above corresponding range, it is convenient to prevent the first pole 12 from easily separating from the first wall 110, further improving the riveting reliability, and facilitating the reduction of the thickness of the portion of the first limiting platform 12b protruding outside the shell 11, reducing the space occupied by the first pole 12 outside the shell 11, and facilitating the improvement of the volume energy density of the battery 100. At the same time, when all parameters of the first limiting platform 12b are within the above range, the number of first poles 12 of the same polarity on the first wall 110 can be one or more, in particular, two, and the two first poles 12 are arranged at intervals along the second direction Y. Of course, the number of first poles 12 of the same polarity can also be four.

[0234] Optionally, a length L1 of the first limiting platform 12b in the first direction X is less than or equal to 1 / 2 of a length a0 of the first wall 110 in the first direction X, that is, a0 / 3≤L1≤a0 / 2. This ensures both the reliability of the first wall 110 and the compatibility of the number of poles 12 required to be arranged on the first wall 110 while improving the stability of the riveting between the first pole 12 and the housing 11. For example, L1 can be 0.35*a0, 0.4*a0, 0.46*a0, 0.5*a0, etc.

[0235] Optionally, a width L2 of the first limiting platform 12b in the second direction Y is less than or equal to 3 / 8 of the width b0 of the first wall 110 in the second direction Y, that is, b0 / 4 ≤ L2 ≤ 3*b0 / 8. This also facilitates improving the stability of the riveting between the first pole 12 and the housing 11 while also ensuring the reliability of the first wall 110 and the compatibility of the number of poles 12 required to be arranged on the first wall 110. For example, L2 can be 0.28*b0, 0.32*b0, 0.35*b0, or 0.375*b0, etc.

[0236] Optionally, the cross-sectional area S1 of the first limiting platform 12b is less than or equal to 12.5% ​​of the area S0 of the first wall 110, that is, 4.5%*S0≤S1≤12.5%*S0, so as to improve the reliability of the riveting between the first pole 12 and the housing 11 while also taking into account the reliability of the first wall 110. For example, S1 can be 4.7%*S0, 5.2%*S0, 6.8%*S0, 7.6%*S0, 9%*S0, 10.5%*S0, 11%*S0, 11.6%*S0, 12%*S0, or 12.5%*S0, etc.

[0237] For example, in the examples of Figures 14 to 18, four mounting holes 113 are formed on the first wall 110, and four first poles 12 are respectively set in the four mounting holes 113, that is, each mounting hole 113 can be respectively set with a first pole 12, and the four first poles 12 have the same polarity, then two of the first poles 12 are positive poles, and the other two first poles 12 are negative poles; wherein, each first pole 12 satisfies at least one of the following conditions: the length dimension L1 of the first limiting platform 12b in the first direction X is greater than or equal to the length dimension L2 of the first wall 110 in the first direction X is 1 / 3 of the length dimension a0 of the first wall 110; the width dimension L2 of the first limit platform 12b in the second direction Y is greater than or equal to 1 / 4 of the width dimension b0 of the first wall 110 in the second direction Y; the cross-sectional area of ​​the first limit platform 12b is greater than or equal to 4.5% of the area of ​​the first wall 110; along the axial direction Z of the mounting hole 113, the thickness dimension t1 of the first limit platform 12b is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110, and t1 is less than or equal to 1.5 of the thickness dimension t0 of the first wall 110.

[0238] In some embodiments of the present application, as shown in Figures 7 to 9, the length dimension L1 of the first limit platform 12b in the first direction X is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X, for example, L1 can be a0 / 3, 0.34*a0, 0.4*a0, or 0.45*a0, etc.; the width dimension L2 of the first limit platform 12b in the second direction Y is greater than or equal to 1 / 2 of the width dimension b0 of the first wall 110 in the second direction Y, for example, L2 can be 0.5*b0, 0.52*b0, or 0.55*b0, or 0.58*b0, etc.; the first limit platform 12b is columnar, and the circumference dimension of the outer periphery of the first limit platform 12b is greater than or equal to 30% of the circumference dimension of the first wall 110, for example, the circumference of the outer periphery of the first limit platform 12b is greater than or equal to 30% of the circumference dimension of the first wall 110, The size is 30%, 35%, 38%, 40%, 42%, 46%, 48%, or 52% of the circumference of the first wall 110; the cross-sectional area S1 of the first limit platform 12b is greater than or equal to 9% of the area S0 of the first wall 110, and the cross-section of the first limit platform 12b is perpendicular to the axial direction Z of the mounting hole 113, for example, the cross-sectional area S1 of the first limit platform 12b is the area S0 of the first wall 110; along the axial direction Z of the mounting hole 113, the thickness dimension t1 of the first limit platform 12b is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110, and t1 is less than or equal to 1.5 of the thickness dimension t0 of the first wall 110, for example, t1 can be 0.6*t0, 0.7*t0, 0.8*t0, 1*t0, 1.3*t0, or 1.5*t0, etc. It is understandable that in other embodiments, only part of the above conditions may be met, and this embodiment does not limit this.

[0239] In the above technical solution, when at least one of the ratio of the length of the first limiting platform 12b to the length of the first wall 110, the ratio of the width of the first limiting platform 12b to the width of the first wall 110, and the ratio of the circumference of the first limiting platform 12b to the circumference of the first wall 110 meets the above corresponding range, the first limiting platform 12b accounts for a large proportion in the length direction and the width direction of the first wall 110, and the size of the matching part of the first limiting platform 12b and the mounting hole 113 is large, which can improve the stability of the riveting between the first pole 12 and the first wall 110, ensure the riveting strength of the first pole 12, thereby improving the reliability and Stability; When the ratio of the cross-sectional area of ​​the first limiting platform 12b to the area of ​​the first wall 110 is within the above range, the flow area of ​​the first pole 12 is large, which can improve the flow and fast charging capabilities of the first pole 12; When the ratio of the thickness of the first limiting platform 12b to the thickness of the first wall 110 meets the above corresponding range, it is convenient to prevent the first pole 12 from being easily separated from the first wall 110, further improving the riveting reliability, and helping to reduce the thickness of the portion of the first limiting platform 12b protruding outside the shell 11, reducing the space occupied by the first pole 12 outside the shell 11, which is conducive to improving the volume energy density of the battery 100. At the same time, when all parameters of the first limiting platform 12b are within the above range, the number of first poles 12 of the same polarity on the first wall 110 can be one or more, in particular, two, and the two first poles 12 are arranged at intervals along the second direction Y. Of course, the number of first poles 12 of the same polarity can also be four.

[0240] In the above technical solution, the first limit platform 12b is columnar, which may refer to the first limit platform 12b being a solid columnar shape or the first limit platform 12b being a hollow columnar shape. At this time, the first limit platform 12b is formed with a through hole passing through the first limit platform 12b along the axial direction Z of the mounting hole 113 (for example, the accommodating portion 121 described later is formed on the first limit platform 12b), which is beneficial to reducing the weight of the first pole 12.

[0241] Optionally, a length L1 of the first limiting platform 12b in the first direction X is less than or equal to 1 / 2 of a length a0 of the first wall 110 in the first direction X, that is, a0 / 3≤L1≤a0 / 2. This ensures both the reliability of the first wall 110 and the compatibility of the number of poles 12 required to be arranged on the first wall 110 while improving the stability of the riveting between the first pole 12 and the housing 11. For example, L1 can be 0.36*a0, 0.43*a0, 0.44*a0, 0.49*a0, etc.

[0242] Optionally, a width L2 of the first limiting platform 12b in the second direction Y is less than or equal to ¾ of the width b0 of the first wall 110 in the second direction Y, that is, b0 / 2 ≤ L2 ≤ 3*b0 / 4. This also facilitates improving the stability of the riveting between the first pole 12 and the housing 11 while also ensuring the reliability of the first wall 110 and the compatibility of the number of poles 12 required to be arranged on the first wall 110. For example, L2 can be 0.54*b0, 0.56*b0, 0.6*b0, 0.62*b0, 0.65*b0, 0.7*b0, 0.75*b0, etc.

[0243] Optionally, the first limiting platform 12b is columnar, and the circumference of the outer periphery of the first limiting platform 12b is less than or equal to 50% of the circumference of the first wall 110. This ensures both the reliability of the first wall 110 and the compatibility of the number of poles 12 required to be arranged on the first wall 110 while improving the reliability of the riveting between the first pole 12 and the housing 11. For example, the circumference of the outer periphery of the first limiting platform 12b can be 32%, 37%, 40%, 45%, 49%, or 50% of the circumference of the first wall 110.

[0244] Optionally, the cross-sectional area S1 of the first limiting platform 12b is less than or equal to 25% of the area S0 of the first wall 110, that is, 9%*S0≤S1≤25%*S0, so as to improve the reliability of the riveting between the first pole 12 and the housing 11 while taking into account the reliability of the first wall 110. For example, S1 can be 9.4%*S0, 10.4%*S0, 13.6%*S0, 15.2%*S0, 18%*S0, 21%*S0, 22%*S0, 23.2%*S0, 24%*S0, or 25%*S0, etc.

[0245] For example, in the examples of Figures 8 to 13, two mounting holes 113 are formed on the first wall 110, and each mounting hole 113 is respectively provided with a first pole 12, and the polarities of the two first poles 12 are opposite; wherein, each first pole 12 satisfies at least one of the following conditions: the length dimension L1 of the first limiting platform 12b in the first direction X is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X; the width dimension L2 of the first limiting platform 12b in the second direction Y is greater than or equal to the width dimension L3 of the first wall 110 in the second direction Y. 1 / 2 of the width dimension b0 in the second direction Y; the first limit platform 12b is columnar, and the circumference dimension of the outer periphery of the first limit platform 12b is greater than or equal to 30% of the circumference dimension of the first wall 110; the cross-sectional area S1 of the first limit platform 12b is greater than or equal to 9% of the area S0 of the first wall 110; along the axial direction Z of the mounting hole 113, the thickness dimension t1 of the first limit platform 12b is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110, and t1 is less than or equal to 1.5 of the thickness dimension t0 of the first wall 110.

[0246] In some embodiments of the present application, as shown in Figures 7 to 9, the length dimension L3 of the second limiting platform 12c in the first direction X is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X, for example, the length dimension L3 of the second limiting platform 12c in the first direction X is a0 / 3, 0.35*a0, 0.36*a0, 0.4*a0, 0.46*a0, or 0.52*a0, etc.; the width dimension L4 of the second limiting platform 12c in the second direction Y is greater than or equal to 1 / 4 of the width dimension b0 of the first wall 110 in the second direction Y, for example, the width dimension L4 of the second limiting platform 12c in the second direction Y is b0 / 4, 0.3*b0, 0.33 *b0, 0.4*b0, 0.48*b0, etc.; the cross-sectional area S2 of the second limiting platform 12c is greater than or equal to 4.5% of the area S0 of the first wall 110, for example, the cross-sectional area S2 of the second limiting platform 12c is 4.5%*S0, 5%*S0, 5.4%*S0, 6%*S0, 7%*S0, etc.; along the axial direction Z of the mounting hole 113, the thickness t2 of the second limiting platform 12c is greater than or equal to 0.6 of the thickness t0 of the first wall 110, and t2 is less than or equal to 1.5 of the thickness t0 of the first wall 110, for example, t2 can be 0.6*t0, 0.7*t0, 0.9*t0, 1*t0, 1.1*t0, or 1.5*t0, etc. It will be understood that in other embodiments, only some of the above conditions may be met, and this embodiment is not limited thereto.

[0247] In the above technical solution, when at least one of the ratio of the length of the second limiting platform 12c to the length of the first wall 110 and the ratio of the width of the second limiting platform 12c to the width of the first wall 110 meets the above corresponding range, the second limiting platform 12c accounts for a large proportion in the length direction and the width direction of the first wall 110, and the size of the matching part of the second limiting platform 12c and the mounting hole 113 is large, which can improve the stability of the riveting between the first pole 12 and the first wall 110, ensure the riveting strength of the first pole 12, and thus improve the reliability and stability of the battery cell 10; when the second limiting platform 12c When the ratio of the cross-sectional area of ​​the second limiting platform 12c to the area of ​​the first wall 110 is within the above range, the flow area of ​​the first pole 12 is large, which can improve the flow and fast charging capabilities of the first pole 12; when the ratio of the thickness of the second limiting platform 12c to the thickness of the first wall 110 meets the above corresponding range, it is convenient to prevent the first pole 12 from being easily separated from the first wall 110, further improving the riveting reliability, and helping to reduce the thickness of the portion of the second limiting platform 122 protruding from the shell 11, reducing the space occupied by the first pole 12 in the shell 11, and helping to improve the volume energy density of the battery cell 10. At the same time, when all parameters of the second limiting platform 12c are within the above range, the number of first poles 12 of the same polarity on the first wall 110 can be one or more, in particular, two, and the two first poles 12 are arranged at intervals along the second direction Y. Of course, the number of first poles 12 of the same polarity can also be four.

[0248] Optionally, a length L3 of the second limiting platform 12c in the first direction X is less than or equal to 1 / 2 of a length a0 of the first wall 110 in the first direction X, that is, a0 / 3≤L3≤a0 / 2. This ensures both the reliability of the first wall 110 and the compatibility of the number of poles 12 required to be arranged on the first wall 110 while improving the stability of the riveting between the first pole 12 and the housing 11. For example, L3 can be 0.35*a0, 0.4*a0, 0.46*a0, or 0.5*a0, etc.

[0249] Optionally, a width L4 of the second limiting platform 12c in the second direction Y is less than or equal to 3 / 8 of the width b0 of the first wall 110 in the second direction Y, that is, b0 / 4 ≤ L4 ≤ 3*b0 / 8. This also facilitates improving the stability of the riveting between the first pole 12 and the housing 11 while also ensuring the reliability of the first wall 110 and the compatibility of the number of poles 12 required to be arranged on the first wall 110. For example, L4 can be 0.28*b0, 0.32*b0, 0.35*b0, or 0.375*b0, etc.

[0250] Optionally, the cross-sectional area S2 of the second limiting platform 12c is less than or equal to 12.5% ​​of the area S0 of the first wall 110, that is, 4.5%*S0≤S2≤12.5%*S0, so as to improve the reliability of the riveting between the first pole 12 and the housing 11 while also taking into account the reliability of the first wall 110. For example, S2 can be 4.7%*S0, 5.2%*S0, 6.8%*S0, 7.6%*S0, 9%*S0, 10.5%*S0, 11%*S0, 11.6%*S0, 12%*S0, or 12.5%*S0, etc.

[0251] For example, in the examples of Figures 14 to 18, four mounting holes 113 are formed on the first wall 110, and four first poles 12 are respectively provided in the four mounting holes 113, that is, each mounting hole 113 can be provided with a first pole 12, and the four first poles 12 have the same polarity, then two of the first poles 12 are positive poles, and the other two first poles 12 are negative poles; wherein each first pole 12 satisfies at least one of the following conditions: the length dimension L3 of the second limiting platform 12c in the first direction X is greater than or equal to the length dimension L3 of the first wall 11 0 is 1 / 3 of the length dimension a0 in the first direction X; the width dimension L4 of the second limit platform 12c in the second direction Y is greater than or equal to 1 / 4 of the width dimension b0 of the first wall 110 in the second direction Y; the cross-sectional area S2 of the second limit platform 12c is greater than or equal to 4.5% of the area S0 of the first wall 110; along the axial direction Z of the mounting hole 113, the thickness dimension t2 of the second limit platform 12c is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110, and t2 is less than or equal to 1.5 of the thickness dimension t0 of the first wall 110.

[0252] In some embodiments of the present application, as shown in Figures 7 to 9, the length L3 of the second limiting platform 12c in the first direction X is greater than or equal to 1 / 3 of the length a0 of the first wall 110 in the first direction X. For example, the length L3 of the second limiting platform 12c in the first direction X is a0 / 3, 0.35*a0, 0.4*a0, 0.42*a0, 0.47*a0, or 0.51*a0, etc.; the width L3 of the second limiting platform 12c in the second direction Y is greater than or equal to 1 / 3 of the length a0 of the first wall 110 in the first direction X. The width dimension L4 is greater than or equal to 1 / 2 of the width dimension b0 of the first wall 110 in the second direction Y. For example, the width dimension L4 of the second limiting platform 12c in the second direction Y is b0 / 2, 0.52*b0, 0.55*b0, 0.58*b0, 0.6*b0, 0.62*b0, 0.67*b0, 0.7*b0, etc. The second limiting platform 12c is cylindrical, and the circumference of the outer periphery of the second limiting platform 12c is greater than or equal to the circumference of the first wall 110. 30% of the long dimension, for example, the circumference of the outer periphery of the second limiting platform 12c is 0.3, 0.32, 0.35, 0.37, 0.4, 0.45, or 0.52 of the circumference of the first wall 110; the cross-sectional area S2 of the second limiting platform 12c is greater than or equal to 9% of the area S0 of the first wall 110, for example, the cross-sectional area S2 of the second limiting platform 12c is 9%*S0, 9.4%*S0, 9.9%*S0, 10.3%*S0, 11% *S0, 11.4%*S0, 12%*S0, 13%*S0, 14%*S0, etc.; along the axial direction Z of the mounting hole 113, the thickness dimension t2 of the second limiting platform 12c is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110, and t2 is less than or equal to 1.5 of the thickness dimension t0 of the first wall 110. For example, t2 can be 0.6*t0, 0.72*t0, 0.8*t0, 1*t0, 1.2*t0, or 1.5*t0, etc. It will be understood that in other embodiments, only some of the above conditions may be met, and this embodiment is not limited thereto.

[0253] In the above technical solution, when at least one of the ratio of the length of the second limit platform 12c to the length of the first wall 110, the ratio of the width of the second limit platform 12c to the width of the first wall 110, and the ratio of the outer circumference of the second limit platform 12c to the circumference of the first wall 110 meets the above corresponding range, the second limit platform 12c accounts for a large proportion in the length direction and width direction of the first wall 110, and the size of the matching part of the second limit platform 12c and the mounting hole 113 is large, which can improve the stability of the riveting between the first pole 12 and the first wall 110, ensure the riveting strength of the first pole 12, and thus improve the reliability of the battery cell 10. and stability; when the ratio of the cross-sectional area of ​​the second limiting platform 12c to the area of ​​the first wall 110 is within the above range, the flow area of ​​the first pole 12 is large, which can improve the flow and fast charging capabilities of the first pole 12; when the ratio of the thickness of the second limiting platform 12c to the thickness of the first wall 110 meets the above corresponding range, it is convenient to avoid the first pole 12 from being easily separated from the first wall 110, further improving the riveting reliability, and helping to reduce the thickness of the portion of the second limiting platform 122 protruding from the shell 11, reducing the space occupied by the first pole 12 in the shell 11, which is conducive to improving the volume energy density of the battery cell 10. At the same time, when all parameters of the second limiting platform 12c are within the above range, the number of first poles 12 of the same polarity on the first wall 110 can be one or more, in particular, two, and the two first poles 12 are arranged at intervals along the second direction Y. Of course, the number of first poles 12 of the same polarity can also be four.

[0254] In the above technical solution, the second limit platform 12c is columnar, which may refer to the second limit platform 12c being a solid columnar shape or a hollow columnar shape. At this time, the second limit platform 12c is formed with a through hole passing through the first limit platform 12b along the axial direction Z of the mounting hole 113 (for example, the accommodating portion 121 described later is formed on the second limit platform 12c), which is beneficial to reducing the weight of the first pole 12.

[0255] Optionally, a length L3 of the second limiting platform 12c in the first direction X is less than or equal to 1 / 2 of a length a0 of the first wall 110 in the first direction X, that is, a0 / 3≤L3≤a0 / 2. This ensures both the reliability of the first wall 110 and the compatibility of the number of poles 12 required to be arranged on the first wall 110 while improving the stability of the riveting between the first pole 12 and the housing 11. For example, L3 can be 0.34*a0, 0.39*a0, 0.43*a0, 0.47*a0, or 0.5*a0, etc.

[0256] Optionally, a width L4 of the second limiting platform 12c in the second direction Y is less than or equal to ¾ of the width b0 of the first wall 110 in the second direction Y, that is, b0 / 2≤L4≤3*b0 / 4. This also facilitates improving the stability of the riveting between the first pole 12 and the housing 11 while also ensuring the reliability of the first wall 110 and the compatibility of the number of poles 12 required to be arranged on the first wall 110. For example, L4 can be 0.52*b0, 0.6*b0, 0.65*b0, 0.72*b0, or 0.75*b0, etc.

[0257] Optionally, the cross-sectional area S2 of the second limiting platform 12c is less than or equal to 12.5% ​​of the area S0 of the first wall 110, that is, 9%*S0≤S2≤25%*S0, so as to improve the reliability of the riveting between the first pole 12 and the housing 11 while taking into account the reliability of the first wall 110. For example, S2 can be 9%*S0, 9.6%*S0, 10%*S0, 11.6%*S0, 12.8%*S0, 13.2%*S0, 14.5%*S0, 15.6%*S0, 16%*S0, 17%*S0, 18.6%*S0, 19.2%*S0, 20%*S0, 25%S0, etc.

[0258] For example, in the examples of Figures 8 to 13, two mounting holes 113 are formed on the first wall 110, and each mounting hole 113 is respectively provided with a first pole 12, and the polarities of the two first poles 12 are opposite, and each first pole 12 respectively satisfies at least one of the following conditions: the length dimension L3 of the second limiting platform 12c in the first direction X is greater than or equal to 1 / 3 of the length dimension a0 of the first wall 110 in the first direction X; the width dimension L4 of the second limiting platform 12c in the second direction Y is greater than or equal to the width dimension L5 of the first wall 110 in the second direction Y. 1 / 2 of the width dimension b0 in the second direction Y; the second limit platform 12c is columnar, and the circumference dimension of the outer periphery of the second limit platform 12c is greater than or equal to 30% of the circumference dimension of the first wall 110; the cross-sectional area S2 of the second limit platform 12c is greater than or equal to 9% of the area S0 of the first wall 110; along the axial direction Z of the mounting hole 113, the thickness dimension t2 of the second limit platform 12c is greater than or equal to 0.6 of the thickness dimension t0 of the first wall 110, and t2 is less than or equal to 1.5 of the thickness dimension t0 of the first wall 110.

[0259] In some embodiments, as shown in FIG7 , in the axial direction Z of the mounting hole 113, the thickness dimension t1 of the first limiting platform 12b satisfies 2 mm ≤ t1 ≤ 3.2 mm, so as to balance the riveting strength between the first terminal 12 and the housing 11 and the space occupied by the first terminal 12 outside the housing 11. For example, t1 can be 2 mm, 2.3 mm, 2.5 mm, 2.8 mm, 3 mm, or 3.2 mm.

[0260] In some embodiments, as shown in FIG7 , in the axial direction Z of the mounting hole 113, the thickness dimension t2 of the first limiting platform 12b satisfies t2 ≤ 2 mm, so as to balance the riveting strength between the first terminal 12 and the housing 11 and the space occupied by the first terminal 12 within the housing 11. For example, t2 can be 2 mm, 1.8 mm, 1.7 mm, or 1.6 mm.

[0261] In some embodiments, as shown in FIG7 , in the radial direction of the mounting hole 113, the width of the portion of the first limiting platform 12b extending beyond the outer peripheral wall of the pole body 12a is x, where x ≥ 1 mm, to further enhance the riveting strength between the first pole 12 and the housing 11. For example, x can be 1 mm, 1.5 mm, 1.8 mm, or 2 mm, etc.

[0262] In some embodiments of the present application, as shown in Figures 8 to 13, the shell 11 has a first wall 110, and two mounting holes 113 are formed on the first wall 110. The two mounting holes 113 are respectively provided with two first poles 12, that is, each mounting hole 113 is respectively provided with a first pole 12, and the polarities of the two first poles 12 are opposite, so one of the first poles 12 is a positive pole and the other first pole 12 is a negative pole.

[0263] Exemplarily, all the first poles 12 of the housing assembly 1 are provided on the first wall 110 . Two first poles 12 with opposite polarities are provided on the first wall 110 , and the two first poles 12 are spaced apart along the first direction X.

[0264] In the above technical solution, the two first poles 12 of different polarities are both arranged on the first wall 110, which facilitates the assembly of the shell 11 and the first pole 12, and the two first poles 12 of the first wall 110 can be used to realize the power supply connection of the battery cell 10, which is conducive to simplifying the power supply connection of the battery cell 10.

[0265] Of course, the arrangement of the first pole 12 is not limited to this; in some embodiments, as shown in Figures 14 to 18, the shell 11 has a first wall 110, and four mounting holes 113 are formed on the first wall 110. The four mounting holes 113 are respectively provided with four first poles 12, that is, each mounting hole 113 is respectively provided with a first pole 12, and the four first poles 12 have the same polarity, then two of the first poles 12 are positive poles, and the other two first poles 12 are negative poles.

[0266] Exemplarily, all the first poles 12 of the shell assembly 1 are arranged on the first wall 110, and four first poles 12 are provided on the first wall 110, wherein two positive poles are arranged at intervals along the second direction Y, two negative poles are arranged at intervals along the second direction Y, and a pole group consisting of two positive poles and a pole group consisting of two negative poles are arranged at intervals along the first direction X.

[0267] In the above technical solution, by arranging the four first poles 12 on the first wall 110, and the four first poles 12 are identical, the assembly of the shell 11 and the multiple first poles 12 is facilitated, and the four first poles 12 of the first wall 110 can be used to realize the power supply connection of the battery cell 10, which is also conducive to simplifying the power supply connection of the battery cell 10.

[0268] Of course, the arrangement of the first pole 12 is not limited to this; in some embodiments, the shell 11 has a first wall 110 and a second wall 11b, the second wall 11b is at an angle to or opposite to the first wall 110 and is spaced apart, the first wall 110 and the second wall 11b are respectively formed with mounting holes 113, and the mounting holes 113 of the first wall 110 and the mounting holes 113 of the second wall 11b are respectively provided with a first pole 12, and the polarities of the two first poles 12 are opposite.

[0269] For example, as shown in FIG70 , the second wall 11b is opposite to and spaced from the first wall 110. A first pole 12 is provided on each of the second wall 11b and the first wall 110, so that the two first poles 12 of the housing assembly 1 are arranged opposite each other, that is, the first poles 12 of the housing assembly 1 are respectively provided on two opposite walls of the housing 1. In this case, the second wall 11b and the first wall 110 can be parallel or at a non-zero angle. Of course, the second wall 11b can also be adjacent to the first wall 110, as shown in FIG3 and FIG4 , in which case the second wall 11b and the first wall 110 form a non-zero angle.

[0270] In the above technical solution, by respectively arranging two first poles 12 with opposite polarities on the first wall 110 and the second wall 11b, the second wall 11b is arranged at an angle to the first wall 110 or opposite to and spaced apart from each other, so that the two first poles 12 with opposite polarities can be arranged relative to each other or at an angle, and the two first poles 12 can be used to realize the power supply connection of the battery cell 10, so that the battery cell 10 can be suitable for different power supply connection usage scenarios, which is beneficial to improving the applicability of the battery cell 10.

[0271] Of course, the arrangement of the first pole 12 is not limited to this; in some other embodiments, the shell 11 has a first wall 110, and two mounting holes 113 are formed on the first wall 110. The two mounting holes 113 are respectively provided with two first poles 12 with the same polarity. The shell 11 further has a second wall 11b that is angled or opposite to the first wall 110 and spaced apart. The second wall 11b is formed with two mounting holes 113, and the two mounting holes 113 of the second wall 11b are respectively provided with a first pole 12. The polarity of the two first poles 12 of the second wall 11b is the same, and the polarity of the two first poles 12 of the second wall 11b is opposite to the polarity of the first pole 12 of the first wall 110.

[0272] Exemplarily, the second wall 11b is opposite to and spaced from the first wall 110. The second wall 11b and the first wall 110 are each provided with two first poles 12. The first poles 12 on the first wall 110 are positive poles, and the first poles 12 on the second wall 11b are negative poles. This allows the positive and negative poles of the housing assembly 1 to be arranged opposite each other, with the first poles 12 of the housing assembly 1 being provided on two opposing walls of the housing 1. In this case, the second wall 11b and the first wall 110 can be parallel or at a non-zero angle. Of course, the second wall 11b can also be adjacent to the first wall 110, in which case the second wall 11b and the first wall 110 form a non-zero angle.

[0273] In the above technical solution, by arranging two first poles 12 with the same polarity on the first wall 110 and two first poles 12 with the same polarity on the second wall 11b, and making the polarity of the first pole 12 on the first wall 110 opposite to the polarity of the first pole 12 on the second wall 11b, it is also possible to make the two first poles 12 with opposite polarities be arranged relative to each other or at an angle, and the four first poles 12 can be used to realize the power supply connection of the battery cell 10, so that the battery cell 10 is suitable for different power supply connection usage scenarios, which is beneficial to improving the applicability of the battery cell 10.

[0274] In some embodiments, as shown in Figures 3 and 4, there are multiple first poles 12, and all first poles 12 are arranged on the same wall of the shell 11. The shell 11 includes multiple walls, one of the multiple walls is provided with all the first poles 12, and the other walls are not provided with first poles 12; when the shell assembly 1 is used for the battery cell 10, the electrical connection between the battery cell assembly 2 of the battery cell 10 and the corresponding first pole 12 can be performed on the same side of the shell 11, which facilitates improving the assembly convenience of the battery cell 10.

[0275] For example, the housing 11 has a first wall 110, and the mounting hole 113 is formed on the first wall 110. In this case, all the first poles 12 are arranged on the first wall 110. The first wall 110 can be the wall with the largest area of ​​the housing 11, or the area of ​​the first wall 110 is smaller than the area of ​​the wall with the largest area of ​​the housing 11.

[0276] In some embodiments, as shown in Figure 3, the shell 11 includes a shell body 111 and a shell cover 112. One end of the shell body 111 is open, and the shell cover 112 is matched with the open end of the shell 11. The first poles 12 are all arranged at the end of the shell body 111 away from the shell cover 112.

[0277] It can be understood that when the battery cells 10 are used to form a battery pack, the first poles 12 of the two battery cells 10 are electrically connected to each other. Since the first poles 12 are arranged on the shell body 111, when the two battery cells 10 are pulled (for example, the battery cells 10 are deformed so that the two battery cells 10 move relative to each other), the pulling force between the two battery cells 10 acts on the shell body 111, and does not act on the lower shell cover 112. In this case, it is not easy to have a pulling force between the shell cover 112 and the shell body 111, so as to effectively reduce the probability of cracking between the shell cover 112 and the shell body 111, and improve the reliability of the battery cells 10.

[0278] Illustratively, the bottom of the shell body 111 is open, and the shell cover 112 is arranged at the bottom end of the shell body 111. When multiple battery cells 10 form a battery pack, the bottom of the shell 11 is fixed on the bracket, that is, at least the shell cover 112112 is fixed on the bracket; when the battery pack vibrates during use, the amplitude of the vibration received by the shell cover 112 is relatively large, which facilitates further reducing the probability of cracking of the shell cover 112 and the shell body 111, thereby improving the reliability of the battery cells 10.

[0279] Optionally, the shell cover 112 may be formed as a flat plate structure, or may be formed as a cover structure that is open toward one end of the shell body 111 .

[0280] In some embodiments, there are multiple first poles 12, and all first poles 12 are respectively arranged on different walls of the shell 11. The shell 11 includes multiple walls, and at least two of the multiple walls are respectively provided with first poles 12, so as to facilitate the flexible arrangement of the battery cell 10 and other electrical connection components, and at the same time facilitate the dispersed arrangement of all first poles 12, so that the first poles 12 can make full use of the arrangement area provided by the corresponding wall, which is beneficial to increase the cross-sectional area of ​​the first pole 12, thereby improving the current carrying capacity of the first pole 12 to a certain extent.

[0281] For example, all the first poles 12 are respectively arranged on two opposite walls of the shell 11 (as shown in Figures 7 to 9), or all the first poles 12 are respectively arranged on two adjacent walls of the shell 11; of course, all the first poles 12 can also be distributed on three or more walls of the shell 11.

[0282] In some embodiments, as shown in Figures 67 and 70, all the first poles 12 are respectively arranged on two opposite walls of the shell 11, which further facilitates the dispersed arrangement of all the first poles 12, so that the first poles 12 can fully utilize the layout area provided by the corresponding walls, which is beneficial to increasing the cross-sectional area of ​​the first pole 12, thereby further improving the current capacity of the first pole 12 to a certain extent.

[0283] For example, the shell 11 has a first wall 110 and a second wall 11b arranged opposite to each other, and mounting holes 113 are respectively formed on the first wall 110 and the second wall 11b, so that the first wall 110 and the second wall 11b are respectively provided with a first pole 12, and the first poles 12 on the first wall 110 are all first polarity poles, and the first poles 12 on the second wall 11b are all second polarity poles, so that the first polarity poles and the second polarity poles have a suitable spacing, which is beneficial to improving the insulation performance between the first polarity poles and the second polarity poles; wherein the first wall 110 and the second wall 11b can be the walls with the largest area of ​​the shell 11, or the area of ​​the first wall 110 and the area of ​​the second wall 11b are both smaller than the area of ​​the wall with the largest area of ​​the shell 11.

[0284] In some embodiments, as shown in Figure 7, the shell assembly 1 also includes an insulating sealing component 8, which is arranged between the first pole 12 and the shell 11 to improve the insulation and sealing between the first pole 12 and the shell 11, and improve the riveting sealing between the first pole 12 and the shell 11, so as to improve the reliability of the battery cell 10 when the shell assembly 1 is used for the battery cell 10.

[0285] In some embodiments, as shown in Figures 9 to 17, the insulating sealing component 8 includes an insulating member 81 and a first sealing member 82. The insulating member 81 is arranged between the first limit platform 12b and the shell 11, and the first sealing member 82 is arranged between the second limit platform 12c and the shell 11. A portion of the insulating member 81 and / or a portion of the first sealing member 82 is fitted between the pole body 12a and the peripheral wall of the mounting hole 113 to separate the pole body 12a from the peripheral wall of the mounting hole 113, facilitate the insulation setting between the first pole 12 and the shell 11, and at the same time facilitate improving the sealing between the pole body 12a and the mounting hole 113.

[0286] It can be seen that since the first pole 12 is riveted to the shell 11, it is convenient to achieve a tight fit between the insulating member 81, the first limit platform 12b and the shell 11, and to achieve a tight fit between the first sealing member 82, the first limit platform 12b and the shell 11, which is beneficial to improving the installation reliability of the first pole 12.

[0287] In some embodiments, as shown in FIG7 , the outer wall of the housing 11 is formed with a first mating groove 11 c to accommodate the insulating member 81 , facilitating the positioning and installation of the insulating member 81 . This can, to a certain extent, prevent the insulating member 81 from being misaligned during the riveting process between the first pole 12 and the housing 11 . Furthermore, while ensuring reliable use of the housing 11 , the provision of the first mating groove 11 c helps reduce the height of the insulating member 81 protruding from the outer wall of the housing 11 , thereby reducing the height of the first pole 12 protruding from the outer wall of the housing 11 , thereby improving the volumetric energy density (VED) of the battery cell 10 . Of course, the outer wall of the housing 11 may also not be formed with the first mating groove 11 c (as shown in FIG9 , FIG16 , and FIG17 ).

[0288] Optionally, the insulating member 81 and the first sealing member 82 may be plastic members or silicone members.

[0289] In some embodiments, as shown in FIG7 , the inner sidewall of the housing 11 is formed with a mating protrusion 11d, which abuts and engages with the first sealing member 82 to improve the sealing reliability of the first sealing member 82. Of course, the inner sidewall of the housing 11 may also not be formed with the mating protrusion 11d ( FIG19 , FIG24 , and FIG25 ).

[0290] For example, in the examples of Figures 7, 19 and 21, the outer wall of the shell 11 is formed with a first mating groove 11c to accommodate the insulating member 81, and the inner wall of the shell 11 is formed with a mating protrusion 11d, which abuts and mates with the first sealing member 82.

[0291] In other embodiments, as shown in Figure 19, a second mating groove 11e may also be formed on the inner wall of the shell 11. The second mating groove 11e is used to accommodate the first seal 82, so that under the premise of reliable use of the shell 11, the height of the first seal 82 protruding from the inner wall of the shell 11 can be reduced, so as to make room for the arrangement of other components inside the shell 11, such as the active material coating part 21, thereby facilitating the improvement of the volume energy density of the battery cell 10.

[0292] Optionally, the insulating sealing component 8 can be an integral piece, for example, the insulating member 81 and the first sealing member 82 are an integral piece, in which case the insulating member 81 and the first sealing member 82 can be made of the same or different materials. Of course, the insulating member 81 and the first sealing member 82 can also be separate pieces.

[0293] Refer to Figure 21, which is a schematic diagram of the assembly process of the first pole 12 and the first wall 110 provided in some embodiments of the present application. In the embodiments of the present application, the first limit platform 12b, the second limit platform 12c and the pole body 12a are an integrated part. Before the first pole 12 is riveted to the shell 11, one of the first limit platform 12b and the second limit platform 12c can extend along the axial direction of the mounting hole 113, and the other can extend along the radial direction of the mounting hole 113. After the pole body 12a is passed through the mounting hole 113, tools can be used to rivet one of the above-mentioned piers of the first limit platform 12b and the second limit platform 12c to extend along the radial direction of the mounting hole 113 to achieve riveting fixation of the first pole 12 to the shell 11.

[0294] In the following description of this application, the shell 11 is square as an example for illustration. After reading the following technical solutions, those skilled in the art will easily understand implementation plans in which the shell 11 has other shapes.

[0295] In some embodiments of the present application, as shown in FIG. 5 and FIG. 6 , the first pole 12 is provided with a receiving portion 121 , and at least a portion of the conductive portion 22 is received in the receiving portion 121 .

[0296] At least one of the multiple poles of the battery cell 10 is a first pole 12 having an accommodating portion 121. The first pole 12 can serve as either a positive or negative pole. The accommodating portion 121 is a virtual structure having a receiving space and can be a slot-like structure, a hole-like structure, or a combination of a slot-like structure and a hole-like structure. In other words, all poles on the housing 11 may be first poles 12 having accommodating portions 121, or a portion of the poles on the housing 11 may be first poles 12 having accommodating portions 121. When a portion of the poles on the housing 11 are first poles 12 having accommodating portions 121, the remaining poles on the housing 11 are second poles 15 without accommodating portions 121 (see Figures 27 and 28).

[0297] Both the first electrode 12 and the second electrode 15 can be electrically connected to the active material coating portion 21 via the conductive portion 22 to enable the battery cell 10 to charge and discharge. Of course, in other embodiments of the present application, the housing assembly 1 can also be provided with only one electrode, which is the first electrode 12. The first electrode 12 includes two parts, which are insulated and connected, and can be used as the positive electrode and the negative electrode respectively. To simplify the description, the following mainly uses the example of all the electrodes on the housing 11 being the first electrode 12 formed with the accommodating portion 121.

[0298] In the embodiment of the present application, referring to Figures 5 and 6 , at least a portion of the conductive portion 22 is accommodated within the corresponding accommodating portion 121. The phrase "at least a portion" means that the conductive portion 22 can be entirely accommodated within the accommodating portion 121, or only a portion of the conductive portion 22 can be accommodated within the accommodating portion 121. Since the first electrode 12 is provided with the accommodating portion 121, the hollow structure of the accommodating portion 121 can reduce the weight of the electrode 12 to a certain extent, thereby increasing the weight energy density of the battery cell 10 and the battery 100.

[0299] Furthermore, by partially or entirely containing the conductive portion 22 within the accommodating portion 121, the portion of the conductive portion 22 located within the accommodating portion 121 can occupy the space within the first electrode 12, thereby reducing the space occupied by the conductive portion 22 within the housing 11. When the size of the housing 11 is fixed, some space can be saved within the housing 11 to accommodate a larger active material coating portion 21, thereby improving the volumetric energy density of the battery cell 10. For example, when the conductive portion 22 is extended from the side of the active material coating portion 21 close to the first electrode 12, the space occupied by the conductive portion 22 between the active material coating portion 21 and the first electrode 12 can be reduced, thereby increasing the size of the active material coating portion 21 in the direction in which the conductive portion 22 is extended, reducing the distance between the active material coating portion 21 and the first electrode 12, and thus improving the energy density of the battery cell 10.

[0300] Furthermore, by accommodating at least a portion of the conductive portion 22 within the accommodating portion 121, the space occupied by the battery cell 10 itself can be reduced, allowing a battery 100 of the same volume to accommodate a greater number of battery cells 10, thereby increasing the volumetric energy density of the battery 100. Furthermore, by accommodating at least a portion of the conductive portion 22 within the accommodating portion 121, thereby occupying the space within the first terminal 12, the redundancy of the conductive portion 22 within the housing 11 can be reduced to at least some extent, reducing the probability of short circuits between the conductive portion 22 and the active material coating portion 21, reducing the probability of short circuits in the battery cell 10, and improving the operational reliability and stability of the battery cell 10 and the battery 100. Furthermore, accommodating at least a portion of the conductive portion 22 within the accommodating portion 121 also facilitates stabilizing and positioning the conductive portion 22, thereby increasing the stability of the conductive portion 22 and facilitating welding of the conductive portion 22 to the first terminal 12, thereby improving assembly efficiency.

[0301] In some optional embodiments of the present application, please refer to Figures 3, 5 and 6 again. Each of the multiple poles on the shell assembly 1 is a first pole 12 having a receiving portion 121. At this time, more conductive portions 22 can be accommodated in all the first poles 12 to better improve the volume energy density of the battery cell 10.

[0302] In some other optional embodiments of the present application, please refer to Figures 27 and 28, at least one of the multiple poles on the shell assembly 1 is a first pole 12 with an accommodating portion 121 and at least one is a second pole 15 without an accommodating portion 121, so that the first pole 12 and the second pole 15 can be flexibly selected and matched according to actual requirements such as energy density and cost to improve the applicability of the battery cell 10.

[0303] It should be noted that, referring to Figures 27 and 28, when the housing 11 is provided with the second pole 15, a relief groove 18 is defined between the second pole 15 and the housing 11, and at least a portion of the conductive portion 22 is received in the relief groove 18. This can also reduce the space occupied by the conductive portion 22 within the housing 11 to a certain extent, which is conducive to improving energy density and alleviating problems such as short circuits caused by redundant conductive portions 22.

[0304] In some embodiments of the present application, the accommodating portion 121 can be located on the side of the first pole 12 facing the active material coating portion 21, or on the side of the first pole 12 facing away from the active material coating portion 21. For example, FIG29 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application; FIG30 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Please refer to FIG29 and FIG30. When the accommodating portion 121 is located on the side of the first pole 12 facing the active material coating portion 21, the accommodating portion 121 includes a first accommodating groove 12110. The surface of the first pole 12 facing the active material coating portion 21 is the pole inner end surface 122. The notch of the first accommodating groove 12110 is formed on the pole inner end surface 122. At least a portion of the conductive portion 22 is accommodated in the first accommodating groove 12110.

[0305] Exemplarily, the first receiving groove 12110 is a groove body, which is a groove-like structure with a certain depth. For example, when the first terminal 12 is disposed on the upper end wall of the housing 11 and the terminal inner end surface 122 is the lower surface of the first terminal 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening open downward and the groove wall recessed upward. For another example, when the first terminal 12 is disposed on the lower end wall of the housing 11 and the terminal inner end surface 122 is the upper surface of the first terminal 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening open upward and the groove wall recessed downward.

[0306] In the above technical solution, on the one hand, the first receiving groove 12110 provided on the first terminal 12 can reduce the weight of the first terminal 12 to a certain extent, thereby increasing the weight energy density of the battery cell 10 and the battery 100. On the other hand, because the notch of the first receiving groove 12110 is formed on the terminal inner end surface 122, which is the surface of the first terminal 12 on the side close to the active material coating portion 21, the first receiving groove 12110 can be opened toward the active material coating portion 21, thereby facilitating the insertion of the conductive portion 22 into the first receiving groove 12110 and improving assembly efficiency. Furthermore, this type of first receiving groove 12110 is easier to process, improving production efficiency.

[0307] In addition, the first receiving groove 12110 is easy to be processed into a larger volume, so that it can accommodate more conductive parts 22; at the same time, since the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended; and also because the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also serve as a storage and buffer structure for gas production inside the battery cell assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0308] Furthermore, because the first receiving groove 12110 is located inside the first pole 12, external foreign matter and impurities are less likely to enter the first receiving groove 12110, thereby reducing the impact of external foreign matter and impurities on the battery cell assembly 2, improving the operational stability and reliability of the battery cell assembly 2, and thereby improving the stability and reliability of the battery cell 10 and battery 100. Furthermore, the first receiving groove 12110 can be positioned to correspond to the position of the mounting hole 113. In other words, on a projection plane perpendicular to the axial direction R of the first pole 12, the orthographic projection of the first receiving groove 12110 is within the orthographic projection of the mounting hole 113. This allows the first receiving groove 12110 to have a greater depth to accommodate more conductive portions 22, thereby significantly reducing the space occupied by the conductive portions 22 within the housing 11.

[0309] Specifically, when the housing 11 is provided with a mounting hole 113 and the first pole 12 is mounted in the mounting hole 113 , along the axial direction R of the first pole 12 , the depth H1 of the first accommodating groove 12110 is greater than or equal to the minimum distance H2 from the inner end surface 122 of the pole to the mounting hole 113 .

[0310] It should be noted that the specific shape of the first receiving groove 12110 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section (a structure formed by two arcs and two straight lines), a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. Therefore, the depth H1 of the first receiving groove 12110 refers to the maximum depth of the first receiving groove 12110 along the axial direction R of the first pole 12.

[0311] Since in the axial direction R of the first pole 12, the depth H1 of the first accommodating groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole to the mounting hole 113, the volume of the first pole 12 can be fully utilized, so that the first accommodating groove 12110 has a larger depth, which is conducive to accommodating more conductive parts 22, and thus can greatly reduce the space occupied by the conductive parts 22 in the shell 11, further improve the energy density of the battery cell 10, and further reduce the redundancy of the conductive parts 22 in the shell 11; at the same time, since the first accommodating groove 12110 has a larger depth, it can also accommodate the gas production of the battery cell assembly 2, ensure the reliability and stability of the battery cell 10, and can also accommodate more electrolyte to ensure the service life of the battery cell 10.

[0312] It should also be noted that the volume of the first receiving groove 12110 is not limited. For example, in some specific examples, the volume of the first receiving groove 12110 that can be used to accommodate the conductive portion 22 (referred to as the first volume V1) can be greater than or equal to 298 mm. 3 , so that the first receiving groove 12110 can have sufficient space to accommodate the conductive part 22 and facilitate welding of the conductive part 22 and the first pole 12. When the first volume V1 of the first receiving groove 12110 is less than 298mm 2 When the conductive portion 22 is not contained in the first receiving groove 12110 , the capacity of the conductive portion 22 to be contained in the first receiving groove 12110 is relatively weakened, and the difficulty of welding the conductive portion 22 and the first pole 12 is increased.

[0313] In addition, it is worth noting that the first volume V1 of the first receiving tank 12110 is the difference between the total volume V2 of the first receiving tank 12110 and the volume of the first receiving tank 12110 required to accommodate other components except the conductive portion 22 (recorded as the second volume V3), that is, V1 = V2 - V3. It is understandable that when the first receiving tank 12110 does not need to accommodate other components except the conductive portion 22, the second volume V3 can be 0mm. 3 For example, the first volume V1 of the first receiving tank 12110 can be 300 mm 3 -1500mm 3, for example, 300mm 3 , 400mm 3 , 500mm 3 , 600mm 3 , 700mm 3 , 800mm 3 , 1000mm 3 , 1200mm 3 , 1400mm 3 , 1500mm 3 etc.

[0314] Referring again to Figures 29 and 30, to ensure the stability and reliability of the electrical connection between the active material coating portion 21 and the first electrode 12, in an embodiment of the present application, the electrical connection location between the conductive portion 22 and the first electrode 12 can be located on the wall of the first receiving groove 12110. For example, the conductive portion 22 and the first electrode 12 can be electrically connected by welding, and the electrical connection location is the welding location of the conductive portion 22 and the first electrode 12. At the same time, the welding method of the conductive portion 22 and the first electrode 12 is not limited, for example, it can be laser welding, and depending on factors such as the position, angle, or structure of the welding part, vertical welding, inclined welding, lap welding, or edge sealing welding can be selected. In other embodiments of the present application, the conductive portion 22 and the first electrode 12 can also be electrically connected by other methods instead of welding, such as by providing conductive glue or conductive nails. To simplify the description, the following description uses the example of the conductive portion 22 and the first electrode 12 being electrically connected by welding, and the welding location is the electrical connection location of the conductive portion 22 and the first electrode 12.

[0315] Specifically, the first electrode 12 includes a first end wall 12111 and a first side wall 12113. The first end wall 12111 is located on a side of the first side wall 12113 away from the active material coating portion 21. The first end wall 12111 and the first side wall 12113 enclose a first receiving groove 12110. The electrical connection position between the conductive portion 22 and the first electrode 12 is located on the first end wall 12111 and / or the first side wall 12113. In other words, the conductive portion 22 can be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0316] In the above technical solution, by arranging the electrical connection position between the conductive portion 22 and the first terminal 12 on at least one of the first end wall 12111 and the first side wall 12113, the first receiving groove 12110 not only serves to accommodate at least a portion of the conductive portion 22, but the groove wall of the first receiving groove 12110 also serves to establish an electrical connection with the conductive portion 22. This simplifies the structure of the first terminal 12, facilitates the processing of the first terminal 12, simplifies the structure of the conductive portion 22, reduces redundancy in the conductive portion 22, and reduces the cost of the conductive portion 22. Furthermore, by utilizing the groove wall of the first receiving groove 12110 to establish an electrical connection with the conductive portion 22, the area where the conductive portion 22 is electrically connected to the first terminal 12 can be set relatively large, which not only reduces the difficulty of electrical connection, but also improves the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0317] In addition, since the electrical connection position between the conductive part 22 and the first pole 12 is located in the first receiving groove 12110, it can not only prevent the electrical connection position from protruding from the outside of the first pole 12 and occupying the space outside the first pole 12, but also enable the electrical connection position to be protected by the first pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the first pole 12.

[0318] In addition, in an embodiment of the present application, the first end wall 12111 is constructed as a closed structure without any perforations, so that the first receiving tank 12110 is isolated from the external space of the shell 11, thereby avoiding the problem of the electrolyte in the shell 11 leaking from the first receiving tank 12110.

[0319] Referring again to Figures 29 and 30 , in the embodiment of the present application, the partial shape of the conductive portion 22 matches the partial shape of the first end wall 12111, and they are arranged to fit and electrically connect, such that the location where the conductive portion 22 is electrically connected to the first end wall 12111 extends along the length or width of the first end wall 12111. For example, when the first end wall 12111 is planar, a portion of the conductive portion 22 can also be planar and fit to the first end wall 12111, and an electrical connection, such as welding, can be made at the fitting location. This can increase the area of ​​the electrical connection, improving the reliability and stability of the electrical connection.

[0320] In addition, when the electrical connection between the conductive part 22 and the first end wall 12111 is welding, since the first end wall 12111 is located on the side of the first receiving groove 12110 away from the active material coating part 21, the welding operation is facilitated. For example, welding can be performed from the side of the first pole 12 away from the active material coating part 21.

[0321] It is worth noting that the shape of the first end wall 12111 is not limited, and can be, for example, a flat plate, an arc-shaped plate, etc. Specifically, when the first end wall 12111 is a flat plate structure, the first end wall 12111 is arranged at an angle to the axial direction R of the first pole 12. For example, the first end wall 12111 can be a flat plate structure perpendicular to the axial direction R of the first pole 12, or can be an inclined plate structure that is not perpendicular to the axial direction R of the first pole 12, but the inclination direction is not limited.

[0322] Of course, in other embodiments of the present application, the position where the conductive part 22 is electrically connected to the first end wall 12111 may not extend along the length or width direction of the first end wall 12111. For example, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the first end wall 12111, which will not be elaborated here.

[0323] FIG31 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Referring to FIG31 , in the embodiments of the present application, when the conductive portion 22 is electrically connected to the first end wall 12111, a first sinking groove 12112 may be provided in the wall of the first receiving groove 12110. The first sinking groove 12112 extends downward away from the active material coating portion 21. At least a portion of the location where the guide portion 22 is electrically connected to the first terminal 12 is located within the first sinking groove 12112.

[0324] Exemplarily, the first accommodating groove 12110 has a first end wall 12111 and a first side wall 12113, and a first recess 12112 is provided on the first end wall 12111, and at least a portion of the position where the conductive part 22 is electrically connected to the first end wall 12111 is located within the first recess 12112; at this time, at least a portion of the conductive part 22 can be disposed within the first recess 12112 and connected to the first end wall 12111 of the first accommodating groove 12110 for defining a portion of the first recess 12112.

[0325] In the above technical solution, on the one hand, the first sink groove 12112 can be used to realize pre-positioning and limiting of the electrical connection position of the conductive part 22, which is not only conducive to finding the correct position to realize electrical connection and improve production efficiency, but also helps to improve the stability and reliability of the conductive part 22, and ensure the stability and reliability of the battery cell 10 during the charging and discharging process; on the other hand, by arranging the first sink groove 12112 on the first end wall 12111, the local wall thickness of the first end wall 12111 can be locally thinned, which is not only conducive to welding, but also helps to reduce the weight of the first pole 12 and improve the weight energy density of the battery cell 10.

[0326] In some optional embodiments, a portion of the conductive portion 22 matches the shape of the first side wall 12113 and is disposed in close contact with it. For example, when the first side wall 12113 is curved, a portion of the conductive portion 22 may also be curved and in close contact with the first side wall 12113. The in close contact portion is then electrically connected (e.g., by welding) so that the portion where the conductive portion 22 is electrically connected to the first side wall 12113 extends along the first side wall 12113. This increases the area of ​​the electrical connection, thereby improving the reliability and stability of the electrical connection.

[0327] Of course, in other embodiments of the present application, the position where the conductive part 22 is electrically connected to the first side wall 12113 may not extend along the first side wall 12113, for example, it may be a plurality of discretely set points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the first side wall 12113, which will not be elaborated here.

[0328] It should be noted that the number of first side walls 12113 is not limited and can be determined based on the shape of the first receiving groove 12110, as long as the end of each first side wall 12113 away from the notch of the first receiving groove 12110 is connected to the first end wall 12111. By way of example, when the cross-sectional shape of the first receiving groove 12110 is circular or elliptical, the first end wall 12111 is circular or elliptical, and there is one first side wall 12113 in an annular shape, disposed around the circumferential edge of the first end wall 12111. By way of further example, when the cross-sectional shape of the first receiving groove 12110 is rectangular or racetrack-shaped, the first end wall 12111 is rectangular or racetrack-shaped, and there are four first side walls 12113, each connected to the four sides of the first end wall 12111.

[0329] It should also be noted that the first receiving groove 12110 is not limited to the form defined by the first end wall 12111 and the first side wall 12113. For example, in some embodiments, the first end wall 12111 may not exist. In this case, the end of the notch of each first side wall 12113 away from the first receiving groove 12110 converges together, so that the first receiving groove 12110 is defined only by multiple first side walls 12113. At this time, the conductive part 22 can be electrically connected to the first side wall 12113 to ensure that the charging and discharging process of the battery cell 10 proceeds normally.

[0330] In addition, it is worth noting that in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the first terminal 12 may not be located within the first receiving groove 12110. For example, the electrical connection position between the conductive portion 22 and the first terminal 12 may also be located on the terminal inner end surface 122. In this case, part of the conductive portion 22 is accommodated within the first receiving groove 12110, which can also save space to a certain extent and improve the energy density of the battery cell 10.

[0331] In an embodiment of the present application, please refer to Figures 30 and 31 again. The first pole 12 can also be provided with a first groove 126 as required. The first groove 126 is located on the side of the first pole 12 away from the active material coating portion 21, that is, the surface of the side of the first pole 12 away from the active material coating portion 21 is the pole outer end face 123, and the notch of the first groove 126 is formed on the pole outer end face 123.

[0332] It is understood that the first groove 126 is a groove body, which is a groove-like structure with a certain depth. Moreover, when the first pole 12 is arranged on the upper end wall of the housing 11 and the pole outer end surface 123 is the upper surface of the first pole 12, the first groove 126 is formed as a groove with the groove opening open upward and the groove wall concave downward (i.e., concave in the direction closer to the battery cell assembly 2). For another example, when the first pole 12 is arranged on the lower end wall of the housing 11 and the pole outer end surface 123 is the lower surface of the first pole 12, the first groove 126 is formed as a groove with the groove opening open downward and the groove wall concave upward (i.e., concave in the direction closer to the battery cell assembly 2).

[0333] In the above technical solution, on the one hand, since the first pole 12 is provided with the first groove 126, the weight of the first pole 12 can be further reduced, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, the first groove 126 is located on the outside of the first pole 12, that is, it is open to the side of the first pole 12 away from the interior of the shell 11. The first groove 126 can be used to accommodate or install structural components in the battery 100 that electrically connect the various battery cells 10, so as to make full use of the space inside the first pole 12 and improve the space utilization and volume energy density of the battery 100.

[0334] In addition, since the first electrode 12 has both the first receiving groove 12110 and the first groove 126, the first groove 126 is located on the side of the first receiving groove 12110 away from the active material coating portion 21, and the first groove 126 is open in a direction away from the first receiving groove 12110. This facilitates laser welding of the conductive portion 22 to the first end wall 12111 through the first groove 126 from the outside of the first electrode 12, i.e., the side of the first electrode 12 away from the active material coating portion 21, thereby facilitating electrical connection between the conductive portion 22 and the first electrode 12 through external welding. In other words, the above-mentioned structural arrangement facilitates external welding of the first electrode 12 and the conductive portion 22 through the first groove 126, facilitates the processing and manufacturing of the battery cell 10, and can save processing and manufacturing costs.

[0335] Furthermore, in order to conveniently and effectively weld the conductive part 22 to the groove wall of the first receiving groove 12110 through the first groove 126, and improve the welding reliability of the conductive part 22 to the groove wall of the first receiving groove 12110, in an embodiment of the present application, the part between the first groove 126 and the first receiving groove 12110 can be laser welded to the conductive part 22, that is, the spacer part 127 shown in Figure 31 is laser welded to the conductive part 22, so as to realize the electrical connection between the battery cell assembly 2 and the first pole 12. The thickness of the spacer 127 of the first pole 12 located between the first groove 126 and the first receiving groove 12110 is relatively thin. The spacer 127 isolates the first groove 126 and the first receiving groove 12110. The side wall of the spacer 127 close to the active material coating part 21 can be used as the first end wall 12111. When the conductive part 22 needs to be welded to the first end wall 12111, since the thickness of the spacer 127 is relatively thin, it is conducive to welding the conductive part 22 and the first end wall 12111 through the first groove 126, thereby improving the convenience and reliability of welding.

[0336] In some embodiments, the first receiving groove 12110 can be configured in a cross-sectional shape with a length greater than width, such as a rectangle, an ellipse, a racetrack, or the like. The weld mark formed by welding the conductive portion 22 to the first electrode 12 can be a long, strip-shaped weld mark parallel to the length of the first receiving groove 12110, thereby improving welding reliability and enhancing current flow performance. For example, when the weld mark formed by welding the conductive portion 22 to the first end wall 12111 is a long, strip-shaped weld mark, the width of the weld mark can be greater than or equal to 6 mm, and the distance between the weld mark and the first side wall 12113 can be greater than or equal to 1 mm, thereby ensuring welding convenience and reliability while also ensuring the current flow capacity of the battery cell 10.

[0337] Referring to FIG. 30 again, the battery cell 10 may further include a slot cover 7 . The slot cover 7 is disposed on the first electrode 12 and covers the opening of the first groove 126 .

[0338] In the above technical solution, by providing a slot cover 7 that covers the first groove 126, the first pole 12 can be indirectly electrically connected to the busbar through the slot cover 7. By adjusting the position and structure of the slot cover 7, the electrical connection between the slot cover 7 and the busbar is more convenient and the electrical connection area is larger. Therefore, the provision of the slot cover 7 facilitates the electrical connection between adjacent battery cells 10 in the battery 100. Since the location where the battery cells 10 are electrically connected is located on the slot cover 7, the electrical connection location between the conductive portion 22 and the first pole 12 can be separated by the first groove 126, reducing interference between the two, and further improving the stability and reliability of the battery cells 10.

[0339] It should be noted that, based on the solution that the accommodating portion 121 includes the first accommodating groove 12110 , the specific structure of the battery cell assembly 2 of the embodiment of the present application is not limited, and for example, may include but is not limited to the following two implementations.

[0340] Figure 32 is a partial cross-sectional schematic diagram of the battery cell assembly 2 provided in some embodiments of the present application. Please refer to Figures 30 to 32. In the first embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 provided on the current collector 211. The conductive portion 22 includes a pole ear portion 221 electrically connected to the current collector 211. The pole ear portion 221 includes a plurality of pole ear sheets 2211. The pole ear sheets 2211 are structures that are electrically connected to the current collector 211 but are not coated with active materials. They can be formed by directly die-cutting the current collector 211. The plurality of pole ear sheets 2211 converge near the current collector 211 (that is, gather in a direction close to each other) to form a first gathered portion 2212. The plurality of pole ear sheets 2211 converge away from the current collector 211 and are connected to form a second gathered portion 2213. The first gathered portion 2212 connects the second gathered portion 2213 and the active material coating portion 21. When the accommodating portion 121 has a first accommodating groove 12110 , at least a portion of the second retracted portion 2213 may be accommodated in the first accommodating groove 12110 .

[0341] In the above technical solution, the plurality of tabs 2211 are merely brought together (i.e., gathered in a direction approaching each other) but not connected when forming the first gathered portion 2212, whereas the plurality of tabs 2211 are not only brought together but also connected into an integrated structure when forming the second gathered portion 2213. For example, the plurality of tabs 2211 can be connected into an integrated plate structure by welding (e.g., ultrasonic welding) to form the second gathered portion 2213. For example, the plurality of tabs 2211 can also be brought together and connected to form the second gathered portion 2213 by bonding with conductive adhesive, etc., which will not be described in detail here.

[0342] It should be noted that in the embodiments of the present application, the tabs 2211 are divided into positive electrode tabs 2211 and negative electrode tabs 2211. The positive electrode tabs 2211 that need to be gathered together are stacked together and ultrasonically pre-welded to form the positive electrode second gathered portion 2213. This can reduce the gaps between layers, allowing the fluffy multiple positive electrode tabs 2211 to form a sheet structure with a certain degree of rigidity. Similarly, the negative electrode tabs 2211 that need to be gathered together are stacked together and ultrasonically pre-welded to form the negative electrode second gathered portion 2213. This can reduce the gaps between layers, allowing the fluffy multiple negative electrode tabs 2211 to form a sheet structure with a certain degree of rigidity.

[0343] In the above technical solution, the phrase "a plurality of electrode tabs 2211 converge at positions close to the current collector 211 to form a first gathered portion 2212, and a plurality of electrode tabs 2211 converge and connect at positions away from the current collector 211 to form a second gathered portion 2213" is intended to explain that, along the extension direction of the electrode tab 2211, the first gathered portion 2212 and the second gathered portion 2213 are sequentially arranged in a direction away from the current collector 211, and the specific positions of the first gathered portion 2212 and the second gathered portion 2213 are not limited, i.e., there is no requirement for the first gathered portion 2212 to be close to the current collector 211, nor for the second gathered portion 2213 to be far from the current collector 211. In some optional examples, the current collector 211 and the electrode tab 2211 may be an integral part, such as an integrally formed aluminum foil for a positive electrode tab, or an integrally formed copper foil for a negative electrode tab, and so on.

[0344] In the above technical solution, since the pole ear portion 221 includes a second gathered portion 2213 formed by converging and connecting multiple pole ear sheets 2211, at least a portion of the second gathered portion 2213 is accommodated in the first accommodating groove 12110, which facilitates the connection between the conductive portion 22 and the first pole 12, can fully utilize the space of the first pole 12, and improve the volume energy density of the battery cell 10.

[0345] 30-32 , in the first embodiment, at least a portion of the first gathered portion 2212 is accommodated within the first receiving groove 12110. In the above technical solution, at least a portion of the first gathered portion 2212 and at least a portion of the second gathered portion 2213 of the electrode lug 221 are both accommodated within the first receiving groove 12110, thereby more fully utilizing the space within the first electrode column 12 and further reducing the space occupied by the electrode lug 221 within the housing 11 to accommodate a larger active material coating portion 21, thereby improving the volumetric energy density of the battery cell 10. Furthermore, the redundancy of the electrode lug 221 within the housing 11 can be further reduced, further reducing the probability of short circuit between the electrode lug 221 and the active material coating portion 21.

[0346] In this embodiment, the second gathered portion 2213 is directly or indirectly electrically connected to the first terminal 12. For example, referring to Figure 30 , when the second gathered portion 2213 is directly electrically connected to the first terminal 12, such as when the second gathered portion 2213 is welded (e.g., laser welded) to the first terminal 12, the structure of the battery cell assembly 2 can be simplified, reducing parts, simplifying the assembly process, and improving assembly efficiency. The method and location of the direct electrical connection between the second gathered portion 2213 and the first terminal 12 are not limited. For example, the electrical connection position between the second gathering portion 2213 and the first pole 12 can be located at the first end wall 12111 and / or the first side wall 12113. Furthermore, the electrical connection position between the second gathering portion 2213 and the first end wall 12111 can extend along the length direction or width direction of the first end wall 12111. Further, the first end wall 12111 has a first groove 12112, and the electrical connection position between the second gathering portion 2213 and the first end wall 12111 can be located in the first groove 12112, and so on. The corresponding technical effects can be referred to the introduction of the above embodiments and will not be repeated here.

[0347] As an optional solution, the conductive portion 22 may also be provided with a transition piece 222 as required, in which case the second retracted portion 2213 is indirectly electrically connected to the first pole 12. Specifically, referring to FIG31 , when the conductive portion 22 includes the transition piece 222, the transition piece 222 is connected to the second retracted portion 2213, and the conductive portion 22 is electrically connected to the first pole 12 via the transition piece 222. In this case, at least a portion of the transition piece 222 is accommodated within the first receiving groove 12110. In this example, at least a portion of the second retracted portion 2213 is also accommodated within the first receiving groove 12110. However, the first retracted portion 2212 may or may not be accommodated within the first receiving groove 12110.

[0348] In the above technical solution, the active material coating portion 21 can be electrically connected to the first electrode 12 through the first gathered portion 2212, the second gathered portion 2213, and the adapter plate 222 in sequence. The location where the conductive portion 22 is electrically connected to the first electrode 12 is located on the adapter plate 222. For example, the electrical connection can be achieved by welding (e.g., laser welding) the adapter plate 222 to the first electrode 12. In addition, the adapter plate 222 and the tab 2211 are two separate components and are connected by welding (e.g., ultrasonic welding).

[0349] In the above technical solution, on the one hand, by accommodating at least a portion of the second accordion portion 2213 and at least a portion of the adapter plate 222 within the first receiving groove 12110, the space within the first electrode 12 can be more fully utilized, further reducing the space occupied by the conductive portion 22 within the housing 11, thereby improving the volumetric energy density of the battery cell 10. Furthermore, when at least a portion of the first accordion portion 2212, at least a portion of the second accordion portion 2213, and at least a portion of the adapter plate 222 are all accommodated within the first receiving groove 12110, the space within the first electrode 12 can be further fully utilized, more effectively reducing the space occupied by the conductive portion 22 within the housing 11, thereby further improving the volumetric energy density of the battery cell 10.

[0350] On the other hand, by using the adapter plate 222 to achieve indirect electrical connection between the second gathered portion 2213 and the first pole 12, the adapter plate 222 can be welded to the first pole 12 at a position avoiding the second gathered portion 2213, thereby making the welding between the adapter plate 222 and the first pole 12 more secure, reducing the risk of welding cracking, and further improving the reliability and stability of the battery cell 10; at the same time, electrically connecting the first pole 12 and the pole tab 2211 through the adapter plate 222 can also simplify the structure of the pole tab 2211.

[0351] Among them, the direct electrical connection method and position of the adapter plate 222 and the first pole 12 are not limited. For example, the adapter plate 222 is electrically connected to the first pole 12 by welding. For example, the electrical connection position of the adapter plate 222 and the first pole 12 can be located at the first end wall 12111 and / or the first side wall 12113. Further, the position where the adapter plate 222 is electrically connected to the first end wall 12111 can extend along the length direction or width direction of the first end wall 12111. Further, the first end wall 12111 has a first sink 12112, and the position where the adapter plate 222 is electrically connected to the first end wall 12111 can be located in the first sink 12112, etc. The corresponding technical effects can be referred to the introduction of the above embodiment and will not be repeated here. When the electrical connection position between the adapter plate 222 and the first pole 12 is located at the first end wall 12111 and / or the first side wall 12113, since at least part of the adapter plate 222 is accommodated in the first accommodating groove 12110, the structure of the adapter plate 222 can be simplified, redundancy can be reduced, and cost can be lowered.

[0352] Referring to Figures 31 and 32 , in a second embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive portion 22 includes a tab portion 221 and a transition piece 222. The tab portion 221 includes a plurality of tabs 2211 electrically connected to the current collector 211. The plurality of tabs 2211 converge near the current collector 211 to form a first gathered portion 2212. The plurality of tabs 2211 converge and connect to form a second gathered portion 2213 away from the current collector 211. The transition piece 222 is electrically connected to the second gathered portion 2213. When the accommodating portion 121 has a first accommodating groove 12110, at least a portion of the transition piece 222 can be accommodated in the first accommodating groove 12110 and electrically connected to the first electrode 12.

[0353] In the above technical solution, compared with the solution in the first embodiment including the adapter plate 222, in the second embodiment, at least a portion of the adapter plate 222 is accommodated in the first accommodating groove 12110, but the relative position of the pole ear portion 221 and the first accommodating groove 12110 is not limited, that is, at least a portion of the pole ear portion 221 can be accommodated in the first accommodating groove 12110, and the pole ear portion 221 can also be completely located outside the first accommodating groove 12110, thereby meeting different structural design requirements.

[0354] In the above technical solution, by accommodating at least a portion of the adapter plate 222 in the first accommodating groove 12110, the adapter plate 222 can occupy the space in the first pole 12, thereby reducing the space occupied by the adapter plate 222 in the shell 11 to accommodate a larger active material coating part 21, thereby improving the volume energy density of the battery cell 10, and reducing the probability of short circuit between the adapter plate 222 and the active material coating part 21, reducing the risk of short circuit of the battery cell assembly 2, and thus improving the stability and reliability of the battery cell 10.

[0355] In addition, by using the adapter plate 222 to achieve indirect electrical connection between the second retracted portion 2213 and the first pole 12, the adapter plate 222 can be welded to the first pole 12 at a position avoiding the second retracted portion 2213, so that the welding between the adapter plate 222 and the first pole 12 is firm, the risk of welding cracking is small, and the reliability and stability of the battery cell 10 can be further improved; at the same time, by electrically connecting the first pole 12 and the pole tab 2211 through the adapter plate 222, the structure of the pole tab 2211 can also be simplified.

[0356] For example, in some optional embodiments, such as the first embodiment above or the third embodiment below, when the second gathered portion 2213 is directly electrically connected to the first electrode 12, the conductive portion 22 may be composed solely of the positive electrode tab and the negative electrode tab in each electrode assembly 2a. For example, in other embodiments, such as the first or second embodiment above, or the third or fourth embodiment below, when the second gathered portion 2213 is indirectly electrically connected to the first electrode 12 via the adapter 222, the conductive portion 22 may be composed simultaneously of the positive electrode tab and the negative electrode tab in each electrode assembly 2a and each adapter 222.

[0357] Figure 33 is a diagram of various tab folding schemes for the battery cell assembly 2 provided in some embodiments of the present application. Please refer to Figures 32 and 33. In some embodiments, when the battery cell assembly 2 includes two electrode assemblies 2a, the tabs 2211 of the two electrode assemblies 2a can be folded together, and the folding position is located at the center position between the two electrode assemblies 2a to form a symmetrical folding form (for example, as shown in Figures 32 and 33 (a)). Alternatively, in some other embodiments, when the tabs 2211 of the two electrode assemblies 2a are folded together, the folding position can also be biased towards one of the electrode assemblies 2a to form an asymmetrical folding form (for example, as shown in Figures 33 (b) and 33 (c)). In addition, the electrode assembly 2a can be in a full-tab form (for example, as shown in Figure 33 (a)) or a half-tab form (for example, as shown in Figures 32, 33 (b) and 33 (c)).

[0358] Of course, the tabs 2211 of the same polarity of the two electrode assemblies 2a may not be folded together. For example, the tabs 2211 of each electrode assembly 2a may be folded separately according to the positive and negative poles, that is, the positive tab of one electrode assembly 2a is folded separately, and the positive tab of the other electrode assembly 2a is also folded separately. This is not detailed here.

[0359] It should be noted that the accommodating portion 121 of the embodiment of the present application is not limited to having the form of the first accommodating groove 12110. For example, some other optional embodiments will be given later.

[0360] For example, Figure 34 is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application. Please refer to Figure 34. In the embodiments of the present application, the accommodating portion 121 can also be configured to include a second accommodating groove 12120. The surface of the first pole 12 away from the active material coating portion 21 is the pole outer end face 123. The notch of the second accommodating groove 12120 is formed on the pole outer end face 123. The second accommodating groove 12120 is connected to the interior of the shell 11 through the first through-hole 12130. The conductive portion 22 is passed through the first through-hole 12130 and is at least partially accommodated in the second accommodating groove 12120.

[0361] It is understood that the second receiving groove 12120 is a groove body, which is a groove-like structure with a certain depth. For example, when the first pole 12 is disposed on the upper end wall of the housing 11 and the pole outer end surface 123 is the upper surface of the first pole 12, the second receiving groove 12120 is formed as a receiving groove with an upwardly open groove opening and a downwardly recessed groove wall. For another example, when the first pole 12 is disposed on the lower end wall of the housing 11 and the pole outer end surface 123 is the lower surface of the first pole 12, the second receiving groove 12120 is formed as a receiving groove with a downwardly open groove opening and an upwardly recessed groove wall.

[0362] In the above technical solution, please refer to Figure 34. On the one hand, the first electrode 12 is provided with a second receiving groove 12120, which can reduce the weight of the first electrode 12 to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the notch of the second receiving groove 12120 is formed on the electrode outer end surface 123, and the electrode outer end surface 123 is the surface of the first electrode 12 on the side away from the active material coating portion 21, the second receiving groove 12120 can be open in a direction away from the active material coating portion 21. In this way, when at least a portion of the conductive portion 22 is accommodated in the second receiving groove 12120, the conductive portion 22 can be easily stored and arranged through the notch of the second receiving groove 12120, and the electrical connection operation between the conductive portion 22 and the first electrode 12 can be easily achieved through the notch of the second receiving groove 12120, thereby reducing the production difficulty of the battery cell 10 and improving the production efficiency of the battery cell 10.

[0363] At the same time, since the second receiving tank 12120 can be connected to the interior of the shell 11 through the first perforation 12130, the second receiving tank 12120 can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended; and because the second receiving tank 12120 can be connected to the interior of the shell 11 through the first perforation 12130, the second receiving tank 12120 can also serve as a receiving and buffer structure for gas production inside the battery cell assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0364] It is worth noting that when the receiving portion 121 has the second receiving groove 12120 and the conductive portion 22 is passed through the first through hole 12130 and is at least partially received in the second receiving groove 12120 , the electrical connection position between the conductive portion 22 and the first pole 12 is not limited.

[0365] Exemplarily, when the conductive portion 22 is passed through the first through-hole 12130 and is at least partially accommodated in the second accommodating groove 12120 , in some embodiments of the present application, the electrical connection position between the conductive portion 22 and the first pole 12 is located on the hole wall of the first through-hole 12130 formed by the first pole 12 .

[0366] In the above technical solution, the electrical connection position between the conductive part 22 and the first pole 12 is set on the wall of the first through-hole 12130, thereby facilitating the electrical connection operation between the conductive part 22 and the first pole 12 through the second receiving groove 12120. Moreover, when the electrical connection area between the conductive part 22 and the first pole 12 is large, the electrical connection between the conductive part 22 and the first pole 12 can be utilized to achieve sealing of the first through-hole 12130, thereby saving sealing costs, reducing electrolyte leakage, and saving sealing parts.

[0367] Specifically, the conductive part 22 can be welded to the hole wall of the first through-hole 12130 at the position where the first through-hole 12130 is connected to the second receiving groove 12120, so as to facilitate the operation. Moreover, by controlling the weld mark, the weld mark and the conductive part 22 can be used to seal the first through-hole 12130 to improve the problem of the electrolyte in the shell 11 leaking from the first through-hole 12130.

[0368] As another example, when the conductive portion 22 is passed through the first through-hole 12130 and is at least partially accommodated in the second receiving groove 12120, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the first pole 12 may also be located on the wall of the second receiving groove 12120 formed by the first pole 12. This facilitates electrical connection operations. For example, when the conductive portion 22 is welded to the wall of the second receiving groove 12120 formed by the first pole 12, the risk of conductive particles generated by the welding entering the housing 11 and causing a short circuit or other problems can be reduced.

[0369] Specifically, Figure 35 is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application. Please refer to Figures 34 and 35. The first pole 12 includes a second end wall 12121 and a second side wall 12123. The second end wall 12121 is located on the side of the second side wall 12123 close to the active material coating portion 21. The second end wall 12121 and the second side wall 12123 are arranged to form a second accommodating groove 12120. The first through hole 12130 is opened on the second end wall 12121. The electrical connection position between the conductive portion 22 and the first pole 12 is located on the second end wall 12121 and / or on the second side wall 12123.

[0370] More specifically, the conductive portion 22 and the first pole 12 can be electrically connected by welding, so the welding position is the electrical connection position between the conductive portion 22 and the first pole 12. In other embodiments of the present application, the conductive portion 22 and the first pole 12 can also be electrically connected by other methods instead of welding, such as by providing conductive glue or conductive nails, which will not be described in detail here.

[0371] To simplify the description, the following description uses the example of welding the conductive portion 22 to the first pole 12 to form an electrical connection, where the welding location is the electrical connection location between the conductive portion 22 and the first pole 12. For example, in some embodiments, the electrical connection location between the conductive portion 22 and the first pole 12 is located at the second end wall 12121 and / or the second side wall 12123, and the conductive portion 22 may be welded to at least one of the second end wall 12121 and the second side wall 12123.

[0372] In the above technical solution, by disposing the electrical connection point between the conductive portion 22 and the first terminal 12 on at least one of the second end wall 12121 and the second side wall 12123, the second receiving groove 12120 not only serves to accommodate at least a portion of the conductive portion 22, but the groove wall of the second receiving groove 12120 also serves to achieve electrical connection with the conductive portion 22. This simplifies the structure of the first terminal 12 and facilitates the processing of the first terminal 12. Furthermore, since the first through-hole 12130 is provided in the second end wall 12121, the conductive portion 22 can be easily extended into the second receiving groove 12120 through the first through-hole 12130, thereby simplifying the structure of the conductive portion 22, reducing redundancy of the conductive portion 22, and reducing the cost of the conductive portion 22. Moreover, the opening direction of the slot of the second receiving groove 12120 makes it easy to electrically connect the conductive part 22 with the slot wall of the second receiving groove 12120 through the slot of the second receiving groove 12120, which can reduce the difficulty of electrical connection. Moreover, by utilizing the slot wall of the second receiving groove 12120 to achieve electrical connection with the conductive part 22, the area where the conductive part 22 is electrically connected to the first pole 12 can be relatively large, which can improve the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0373] In addition, since the electrical connection position between the conductive part 22 and the first pole 12 is located in the second receiving groove 12120, it can not only prevent the electrical connection position from protruding from the outside of the first pole 12 and occupying the space outside the first pole 12, but also enable the electrical connection position to be protected by the first pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the first pole 12.

[0374] Referring again to Figures 34 and 35 , in some embodiments, the shape of a portion of the conductive portion 22 matches the shape of a portion of the second end wall 12121, and the conductive portion 22 is positioned to fit and electrically connect to the second end wall 12121, such that the portion where the conductive portion 22 is electrically connected to the second end wall 12121 extends along the length or width of the second end wall 12121. For example, if the second end wall 12121 is planar, a portion of the conductive portion 22 can also be planar and fit to the second end wall 12121, and an electrical connection, such as welding, can be made at the fitting portion. This can increase the area of ​​the electrical connection, improving the reliability and stability of the electrical connection.

[0375] It is worth noting that the shape of the second end wall 12121 is not limited, and can be, for example, a flat plate or an arc-shaped plate structure. When the second end wall 12121 is a flat plate structure, it is arranged at an angle to the axial direction R of the first pole 12. For example, it can be a flat plate structure perpendicular to the axial direction R of the first pole 12, or it can be an inclined flat plate structure that is not perpendicular to the axial direction R of the first pole 12, but the inclination direction is not limited.

[0376] For example, referring to Figures 34 and 35 , when the second end wall 12121 is a flat plate, the angle θ between the second end wall 12121 and the axial direction R of the first electrode 12 is equal to 90°. That is, along the direction from the first through-hole 12130 to the second side wall 12123, the second end wall 12121 is equidistant from the active material coating portion 21. This facilitates welding of the conductive portion 22 to the second end wall 12121.

[0377] For another example, FIG36 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Referring to FIG36 , the angle θ between the second end wall 12121 and the axial direction R of the first terminal 12 is greater than 90°. That is, along the direction from the first through-hole 12130 to the second sidewall 12123, the second end wall 12121 extends obliquely toward the active material coating portion 21. As a result, the conductive portion 22 extends a greater distance along the second end wall 12121, thereby enhancing the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the first terminal 12 can be 90°-145°, such as 100°, 110°, 120°, 130°, 140°, and so on. This makes the second end wall 12121 easier to process and facilitates electrical connection to the conductive portion 22, while also making more efficient use of the space within the first terminal 12 to accommodate the conductive portion 22.

[0378] For another example, FIG37 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Referring to FIG37 , the angle θ between the second end wall 12121 and the axial direction R of the first terminal 12 is less than 90°. That is, along the direction from the first through-hole 12130 to the second side wall 12123, the second end wall 12121 extends obliquely away from the active material coating portion 21. As a result, the distance the conductive portion 22 extends along the second end wall 12121 can be increased, thereby improving the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the first terminal 12 can be 45°-90°, such as 50°, 60°, 70°, 80°, etc. This makes the second end wall 12121 easier to process and facilitates electrical connection to the conductive portion 22. Furthermore, the space within the first terminal 12 can be more fully utilized to accommodate the conductive portion 22.

[0379] Of course, in other embodiments of the present application, the position where the conductive part 22 is electrically connected to the second end wall 12121 may not extend along the length or width direction of the second end wall 12121, and it may also be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the second end wall 12121, which will not be elaborated here.

[0380] Please refer to Figure 35 again. Regardless of the specific value of the angle θ between the second end wall 12121 and the axial direction R of the first pole 12, in the embodiment of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, the second receiving groove 12120 can be provided with a second sinking groove 12122 as required. The sinking direction of the second sinking groove 12122 is the direction close to the active material coating portion 21. The position where the conductive portion 22 is electrically connected to the first pole 12 is at least partially located in the second sinking groove 12122.

[0381] Exemplarily, the second accommodating groove 12120 has a second end wall 12121 and a second side wall 12123, and a second sinking groove 12122 is provided on the second end wall 12121, and the position where the conductive part 22 is electrically connected to the second end wall 12121 is at least partially located in the second sinking groove 12122; at this time, the second sinking groove 12122 is a groove formed by a part of the second end wall 12121 sinking toward the end close to the active material coating part.

[0382] In the above technical solution, the portion of the conductive part 22 located in the second groove 12122 is set to match the shape of the second groove 12122, and is fitted to achieve electrical connection, so that the second groove 12122 can be used to pre-position and limit the electrical connection position of the conductive part 22, which is conducive to finding the correct position to achieve electrical connection, improve production efficiency, and improve the stability and reliability of the electrical connection position, so as to ensure the reliability and stability of the charging and discharging operations of the battery cell 10.

[0383] It should be noted that in the embodiment of the present application, a portion of the conductive portion 22 can also be configured to match the shape of the second side wall 12123 and be fitted thereto. For example, when the second side wall 12123 is a curved surface, a portion of the conductive portion 22 can also be a curved surface and fit thereto, and the fitted portion can be electrically connected (e.g., welded) so that the portion where the conductive portion 22 is electrically connected to the second side wall 12123 extends along the second side wall 12123. This can increase the area of ​​the electrical connection, thereby improving the reliability and stability of the electrical connection.

[0384] It should also be noted that, in other embodiments of the present application, the position where the conductive part 22 is electrically connected to the second side wall 12123 may not extend along the second side wall 12123, for example, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the second side wall 12123, which will not be elaborated here.

[0385] It is understood that the number of second side walls 12123 is not limited and can be determined based on the shape of the second receiving groove 12120. However, it is sufficient that the end of each second side wall 12123 away from the notch of the second receiving groove 12120 is connected to the second end wall 12121. For example, when the cross-sectional shape of the second receiving groove 12120 is circular or elliptical, the second end wall 12121 is circular or elliptical, and there is one second side wall 12123, which is annular and disposed around the circumferential edge of the second end wall 12121. For another example, when the cross-sectional shape of the second receiving groove 12120 is rectangular or racetrack-shaped, the second end wall 12121 is rectangular or racetrack-shaped, and there are four second side walls 12123, each connected to the four sides of the second end wall 12121.

[0386] It should also be noted that the second receiving groove 12120 is not limited to the form defined by the second end wall 12121 and the second side wall 12123. For example, in some embodiments, Figure 38 is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application. Please refer to Figure 38. One end of the notch of each second side wall 12123 away from the second receiving groove 12120 extends to the first perforation 12130, so that the second receiving groove 12120 is defined only by multiple second side walls 12123. At this time, the conductive part 22 can be electrically connected to the second side wall 12123.

[0387] In some embodiments, referring to FIG. 50 , the accommodating portion 121 may have a third accommodating groove 12140 and a second accommodating groove 12120 at the same time. The second accommodating groove 12120 is located on the side of the third accommodating groove 12140 away from the active material coating portion 21. The third accommodating groove 12140 is a groove body, which is a groove-shaped structure with a certain depth. The notch of the third accommodating groove 12140 is formed on the inner end face 122 of the first pole 12 on the side close to the active material coating portion 21. The notch of the second accommodating groove 12120 is formed on the inner end face 122 of the first pole 12. On the outer end face 123 of the first pole 12 on the side away from the active material coating portion 21, the third accommodating groove 12140 and the second accommodating groove 12120 are connected through the first through-hole 12130. At this time, a portion of the conductive portion 22 is located in the third accommodating groove 12140, and the conductive portion 22 is also passed through the first through-hole 12130, and the remaining portion of the conductive portion 22 is located in the second accommodating groove 12120, so that the space in the first pole 12 can be more fully utilized, reducing the space occupied by the conductive portion 22 in the shell 11.

[0388] It is worth noting that when the conductive portion 22 is connected to the second end wall 12121 or the second side wall 12123 via laser welding, referring again to FIG. 38 , the angle β between the welded portion of the conductive portion 22 and the axis of the first through-hole 12130 can be set to be greater than 5°. This reduces the risk of laser light entering the housing 11 through the first through-hole 12130 and facilitates the welding operation. Furthermore, when the angle β between the welded portion of the conductive portion 22 and the axis of the first through-hole 12130 is close to 5°, edge welding can be used; the remaining welds can be lap welded.

[0389] Optionally, referring to Figure 34, the second accommodating groove 12120 can be set corresponding to the position of the mounting hole 113, or in other words, on the projection plane perpendicular to the axial direction R of the first pole 12, the orthographic projection of the second accommodating groove 12120 is located within the orthographic projection range of the mounting hole 113, so that the second accommodating groove 12120 can have a larger depth to accommodate more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the shell 11 to a greater extent.

[0390] In some embodiments, referring again to FIG. 34 , along the axial direction R of the first pole 12 , the depth H3 of the second receiving groove 12120 is greater than or equal to the minimum distance H4 between the pole outer end surface 123 and the mounting hole 113 .

[0391] It should be noted that the specific shape of the second receiving groove 12120 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. It is worth noting that the racetrack shape described herein refers to a shape in which the two short sides of a rectangle are replaced by convex curves, for example, see the shape shown in Figure 40(b).

[0392] Therefore, the depth H3 of the second receiving groove 12120 refers to the maximum depth of the second receiving groove 12120 along the axial direction R of the first pole 12. Since the depth H3 of the second receiving groove 12120 is greater than or equal to the minimum distance H4 between the pole outer end surface 123 and the mounting hole 113 in the axial direction R of the first pole 12, the volume of the first pole 12 can be fully utilized, resulting in the second receiving groove 12120 having a greater depth, which is conducive to accommodating more conductive portions 22, thereby greatly reducing the space occupied by the conductive portions 22 within the housing 11, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive portions 22 within the housing 11. At the same time, due to the greater depth of the second receiving groove 12120, it can also accommodate gassing of the battery cell assembly 2, ensuring the reliability and stability of the battery cell 10, and can also accommodate more electrolyte to ensure the service life of the battery cell 10.

[0393] It should be noted that the volume of the second receiving groove 12120 is not limited. For example, in some specific examples, the volume of the second receiving groove 12120 that can be used to accommodate the conductive portion 22 (recorded as the third volume V4) can be greater than or equal to 298 mm. 3 , so that the second receiving groove 12120 can have sufficient space to accommodate the conductive part 22 and facilitate welding of the conductive part 22 and the first pole 12. When the third volume V4 of the second receiving groove 12120 is less than 298mm 3 When the second receiving groove 12120 has a relatively weaker capacity for the conductive portion 22, the welding difficulty of the conductive portion 22 and the first pole 12 increases. For example, the third volume V4 of the second receiving groove 12120 can be 300mm 3 , 400mm 3 , 500mm 3 , 600mm 3 , 700mm 3 , 800mm 3 , 1000mm 3 etc.

[0394] It is worth noting that the third volume V4 of the second receiving tank 12120 is the difference between the total volume V5 of the second receiving tank 12120 and the volume of the second receiving tank 12120 required to accommodate other components (such as the first cover plate 13 and the second cover plate 14 described herein) other than the conductive portion 22 (recorded as the fourth volume V6), that is, V4 = V5 - V6. For example, in some specific examples, the total volume V5 of the second receiving tank 12120 can be 1400 mm 3 -1500mm 3 , so that the second receiving groove 12120 can have more sufficient space to accommodate the conductive part 22 and other components. For example, the total volume V5 of the second receiving groove 12120 can be 1420mm 3 , 1440mm 3 , 1460mm 3 、1480mm 3 、1490mm 3 etc.

[0395] In the embodiment of the present application, the shape of the first through-hole 12130 , the number of the first through-hole 12130 , and the relative positional relationship between the first through-hole 12130 and the second receiving groove 12120 are not limited.

[0396] For example, FIG39 is an enlarged partial view at W in FIG3 ; FIG40 is an orthographic projection of various first electrodes 12 provided in some embodiments of the present application. Referring to FIG39 and FIG40 , regarding the shape of the first through-hole 12130, in embodiments of the present application, the first through-hole 12130 can be an elongated strip to match the sheet-shaped portion of the conductive portion 22, thereby facilitating the passage of the sheet-shaped portion of the conductive portion 22. Furthermore, when the first through-hole 12130 is an elongated strip, the second receiving groove 12120 can also be configured with a cross-sectional shape that is longer than its width, such as a rectangular, elliptical, or racetrack shape. In this case, the length of the first through-hole 12130 can be aligned with the length of the cross-sectional shape of the second receiving groove 12120, thereby fully utilizing space. Furthermore, the weld mark formed by welding the conductive portion 22 to the first electrode 12 can be an elongated strip parallel to the length of the first through-hole 12130, thereby improving welding reliability and enhancing overcurrent performance. Exemplarily, when the conductive part 22 is welded to the second end wall 12121 to form a long strip-shaped weld mark, the width of the weld mark can be greater than or equal to 6 mm, and the distance between the weld mark and the second side wall 12123 can be greater than or equal to 1 mm, so as to ensure the current flow capacity of the battery cell 10 while ensuring the convenience and reliability of welding.

[0397] Regarding the size and number of the first through-holes 12130, in the embodiments of the present application, the size and specific position of the first through-holes 12130 on the second receiving groove 12120 are not limited, and can be designed according to the number of the first through-holes 12130. For example, the width of the first through-hole 12130 can be greater than or equal to 2 mm, which is conducive to the passage of the conductive part 22. For example, when there is only one first through-hole 12130 opened on the second receiving groove 12120, in some examples, please refer to Figures 39 and 40, the first through-hole 12130 can be centered relative to the second receiving groove 12120. In other examples, Figure 41 is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application. Please refer to Figure 41, the first through-hole 12130 can also be offset relative to the center of the second receiving groove 12120. For example, in some embodiments, referring to Figure 41, the first through-hole 12130 can be opened at the edge of the second end wall 12121 to be arranged close to the second side wall 12123, thereby increasing the available area of ​​the second end wall 12121 to increase the welding area between the conductive part 22 and the second end wall 12121.

[0398] It is understood that after passing through the first through-hole 12130, the conductive portion 22 will be folded to conform to the second end wall 12121, but the direction of the folding is not limited. For example, when the first through-hole 12130 is centrally located relative to the second receiving slot 12120, the conductive portion 22 can be folded toward either side of the first through-hole 12130 after passing through the first through-hole 12130 (see FIG. 39 ), thereby appropriately reducing the size of the second receiving slot 12120 and enhancing the structural compactness and strength. Alternatively, FIG. 42 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Referring to FIG. 42 , the conductive portion 22 can also be folded toward opposite sides simultaneously after passing through the first through-hole 12130 to reduce the thickness of the weld, reduce welding heat input, and thus reduce problems such as particle spatter.

[0399] For example, when there are multiple first through-holes 12130 provided on the second receiving groove 12120, the length directions of the multiple first through-holes 12130 are arranged in parallel or substantially parallel to make full use of the space. In this case, the folding direction of the conductive portion 22 after passing through the first through-hole 12130 can be set according to the relative positional relationship of the multiple first through-holes 12130. For example, when there are two first through-holes 12130 provided on the second receiving groove 12120 and they are far away from each other (see FIG. 43 ), the two conductive portions 22 passing through the two first through-holes 12130 can be folded in a direction toward each other; and when there are two first through-holes 12130 provided on the second receiving groove 12120 and they are close to each other, the two conductive portions 22 passing through the two first through-holes 12130 can be folded in a direction away from each other.

[0400] It is understandable that when there are multiple first through holes 12130 opened on the second receiving groove 12120 , the number of the first poles 12 can be appropriately reduced, thereby reducing costs and reducing the number of processes.

[0401] In addition, in some embodiments, please refer to Figures 41 and 42, the first through-hole 12130 can be centered relative to the active material coating portion 21, but the position of the first through-hole 12130 relative to the second receiving groove 12120 is not limited, and can be centered or offset. Since the first through-hole 12130 is centered relative to the active material coating portion 21, the conductive portion 22 can be retracted corresponding to the center line position of the active material coating portion 21.

[0402] In some embodiments, referring to FIG. 42 , a second sealing member 6 may be provided at the first through-hole 12130 to improve the problem of electrolyte in the housing 11 leaking from the first through-hole 12130. The material, shape, and connection method of the second sealing member 6 with the first through-hole 12130 are not limited. For example, the sealing member 6 may be a metal member made of the same material as the first pole 12 or the conductive portion 22, which may be welded to the wall surface of the first through-hole 12130 of the first pole 12 to seal the first through-hole 12130. For another example, the sealing member 6 may be a plastic member that is plugged into the first through-hole 12130 to seal the first through-hole 12130. In the embodiments of the present application, all of these can be designed according to actual requirements without limitation.

[0403] Figure 44 is a structural explosion diagram of a battery cell provided in some embodiments of the present application, Figure 45 is a partial cross-sectional schematic diagram of a shell assembly provided in some embodiments of the present application, and Figure 46 is a structural explosion diagram of the shell assembly shown in Figure 45. Please refer to Figures 44 to 46. In the embodiments of the present application, when the accommodating portion 121 has the second accommodating groove 12120 of any of the above-mentioned embodiments, optionally, the shell assembly 1 may further include a first cover plate 13, the first cover plate 13 cooperates with the first pole 12, and closes the notch of the second accommodating groove 12120, and the first cover plate 13 is electrically connected to the first pole 12.

[0404] In the above technical solution, by providing the first cover plate 13 to close the notch of the second receiving tank 12120, the electrolyte in the shell 11 can be prevented from leaking from the notch of the second receiving tank 12120. Moreover, since the first cover plate 13 closes the notch of the second receiving tank 12120 and is electrically connected to the first pole 12, the first cover plate 13 can be used to easily realize the indirect electrical connection between the first pole 12 and the busbar component, and it is beneficial to increase the connection area of ​​the electrical connection, thereby helping to reduce the resistance of the electrical connection.

[0405] It is worth noting that the manner and position of the first cover plate 13 and the first terminal 12 are not limited, as long as the first cover plate 13 can seal the notch of the second receiving slot 12120. For example, in some embodiments, referring to FIG. 24 , the first cover plate 13 can be welded to the first terminal 12. During processing, the conductive portion 22 can first be passed through the first through-hole 12130 and welded to the wall of the second receiving slot 12120. The first cover plate 13 and the first terminal 12 are then welded to close the notch of the second receiving slot 12120.

[0406] It should also be noted that the specific structure of the first cover plate 13 is not limited. For example, in some optional embodiments, FIG47 is an exploded view of the structure of the first cover plate shown in FIG46 , and referring to FIG45-47 , the first cover plate 13 includes a first conductive member 131 and a second conductive member 132 made of different materials. The first conductive member 131 is engaged with and electrically connected to the first pole 12, and the second conductive member 132 is engaged with and electrically connected to the first conductive member 131.

[0407] In the above technical solution, the first cover plate 13 is configured as a composite form, and the first conductive member 131 is configured to be made of the same material as the first pole 12, thereby facilitating electrical connection between the first conductive member 131 and the first pole 12. For example, the first conductive member 131 can be easily and reliably and stably connected to the first pole 12 through welding. Furthermore, because the second conductive member 132 is made of a different material than the first conductive member 131, it is convenient to utilize the second conductive member 132 to electrically connect to a busbar component made of a different material than the first pole 12. For example, the second conductive member 132 can be easily and reliably and stably connected to a busbar component made of the same material as the second conductive member 132 through welding.

[0408] For example, when the first pole 12 is a negative pole, the first pole 12 is a copper pole, and the current collector is an aluminum sheet, the first conductive member 131 can be set to copper and the second conductive member 132 can be set to aluminum. In this case, the first pole 12 and the first conductive member 131 are made of the same material and can be effectively welded, and the second conductive member 132 and the current collector are made of the same material and can be effectively welded, thereby effectively achieving an indirect electrical connection between the first pole 12 and the current collector through the first cover 13. Moreover, the copper-to-copper welding of the first pole 12 and the first conductive member 131 has good fluidity and is less likely to crack, which helps to improve the sealing effect of the weld.

[0409] Referring again to Figures 45-47, in some optional examples, the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132. In the above technical solution, since the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132, it can separate the second receiving groove 12120 and the second conductive member 132. Therefore, when the electrolyte in the housing 11 enters the second receiving groove 12120 through the first through-hole 12130, the first conductive member 131 can prevent this portion of the electrolyte from contacting the second conductive member 132, thereby solving the problem of corrosion of the second conductive member 132 by the electrolyte.

[0410] It is worth noting that the coupling method between the first conductive member 131 and the second conductive member 132 is not limited. For example, in some embodiments, referring to Figures 45-47, the first conductive member 131 has a second groove 1311, and the second conductive member 132 is embedded in the second groove 1311. The notch of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second receiving slot 12120, so that the second conductive member 132 is exposed through the notch of the second groove 1311. Alternatively, in other embodiments, the connection method between the first conductive member 131 and the second conductive member 132 can also be a fastening connection, a snap connection, etc.

[0411] It should also be noted that the "exposed" of the second conductive member 132 by the notch of the second groove 1311 means that the first conductive member 131 does not block the second conductive member 132 at the notch position of the second groove 1311, and the second conductive member 132 is not required to protrude from the notch of the second groove 1311. For example, the second conductive member 132 can be flush with the surface of the first conductive member 131 on the side away from the second accommodating groove 12120, or the second conductive member 132 can protrude from the surface of the first conductive member 131 on the side away from the second accommodating groove 12120.

[0412] In the above technical solution, on the one hand, by embedding the second conductive member 132 within the first conductive member 131, the difficulty of assembling the first conductive member 131 and the second conductive member 132 can be reduced, the stability and convenience of the cooperation between the first conductive member 131 and the second conductive member 132 can be improved, and the thickness of the first cover plate 13 can be reduced, reducing the space occupied by the first cover plate 13, thereby improving the space utilization of the battery cell 10. On the other hand, since the second conductive member 132 can be exposed from the surface of the first conductive member 131 on the side away from the second receiving groove 12120 through the notch of the second groove 1311, it is convenient to achieve electrical connection between the second conductive member 132 and the current collecting component outside the first terminal 12.

[0413] In addition, since the notch of the second groove 1311 is formed on the surface of the first conductive member 131 on the side away from the second receiving groove 12120, it means that the second groove 1311 is open in the direction away from the active material coating portion 21, so that the portion of the groove wall of the first conductive member 131 used to define the second groove 1311 is located between the second receiving groove 12120 and the second conductive member 132 to separate the second receiving groove 12120 and the second conductive member 132, thereby preventing the electrolyte entering the second groove 1311 from contacting the second conductive member 132, thereby reducing leakage of the electrolyte.

[0414] Of course, in other embodiments, the first cover plate 13 may not be a composite form composed of multiple materials. For example, in other embodiments of the present application, Figure 48 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application, and Figure 49 is a structural explosion diagram of the battery cell shown in Figure 48. Combining Figures 48 and 49, the first cover plate 13 as a whole may also be set to a non-composite form made of the same material, for example, for adapting to the positive electrode column, which will not be elaborated here.

[0415] Referring again to Figures 45-47, in some embodiments, the first cover plate 13 is further embedded in the notch of the second receiving groove 12120. In the above technical solution, by embedding the first cover plate 13 in the second receiving groove 12120, the difficulty of assembling the first cover plate 13 and the first pole 12 can be reduced, the assembly stability of the first cover plate 13 and the first pole 12 can be improved, as well as the reliability and convenience of the connection. In addition, the space occupied by the first cover plate 13 outside the first pole 12 can be reduced. Moreover, because the first cover plate 13 is embedded in the notch of the second receiving groove 12120, there is sufficient space in the second receiving groove 12120 to accommodate the conductive portion 22.

[0416] Of course, in other embodiments of the present application, the cooperation manner of the first cover plate 13 and the first pole 12 is not limited to being embedded in the second receiving groove 12120. The first cover plate 13 can also be directly covered outside the first pole 12, that is, directly covered at the notch of the second receiving groove 12120, so as to facilitate cooperation with the convergence component of the battery 100. This is not limited in this embodiment.

[0417] Referring again to Figures 45 and 46, optionally, in an embodiment of the present application, at least a portion of the wall surface at the notch of the second receiving groove 12120 formed on the first pole 12 is formed into a guiding bevel 12126. The guiding bevel 12126 is used to guide the first cover plate 13 to mate with the notch of the second receiving groove 12120. In the above technical solution, by processing the wall surface at the notch of the second receiving groove 12120 into a guiding bevel, the difficulty of assembling the first cover plate 13 and the second receiving groove 12120 can be reduced, and the efficiency of assembling the first cover plate 13 and the second receiving groove 12120 can be improved. Moreover, when the first cover plate 13 is welded to the guiding bevel 12126, the area of ​​the weld can be increased, thereby improving the reliability of the weld connection between the first cover plate 13 and the first pole 12 and alleviating the problems of molten pool collapse or laser penetration into the first pole 12 during welding.

[0418] Specifically, referring to Figures 45-47, the second receiving groove 12120 includes a first groove section 12124 and a second groove section 12125 located on a side of the first groove section 12124 closer to the pole outer end surface 123. The cross-sectional area of ​​the second groove section 12125 is larger than that of the first groove section 12124, giving the second receiving groove 12120 a stepped groove shape. Furthermore, a stepped surface 12127 is formed at the junction of the first groove section 12124 and the second groove section 12125. This allows the first cover plate 13, when embedded in the second receiving groove 12120, to be embedded in the second groove section 12125 and supported by the stepped surface 12127.

[0419] In the above technical solution, by setting the second accommodating groove 12120 to a stepped groove form, the first cover plate 13 can be stably fitted in the groove position of the second accommodating groove 12120, thereby improving the connection stability between the first cover plate 13 and the first pole 12, and by limiting the groove depth of the first groove section 12124, there is relatively sufficient space in the second accommodating groove 12120 to accommodate the conductive part 22.

[0420] Furthermore, when the wall surface at the slot of the second accommodating slot 12120 formed by the first pole 12 is a guide slope 12126, the cross-sectional area of ​​the second slot segment 12125 can be set to gradually increase in the direction approaching the outer end face 123 of the pole, so that the side wall of the second slot segment 12125 is formed as a guide slope 12126, thereby facilitating processing and simply and effectively meeting the guidance requirements.

[0421] Referring again to Figures 45-47, in the embodiment of the present application, the first cover plate 13 may further include stress relief grooves 133 as needed. The stress relief grooves 133 are located in the outer peripheral area of ​​the first cover plate 13 to assist in stress relief for the first cover plate 13. In the above technical solution, by providing the stress relief grooves 133 on the first cover plate 13, stress generated during the processing of the first cover plate 13 itself or during the electrical connection between the first cover plate 13 and the first terminal 12 can be relieved, thereby improving issues such as deformation or damage to the first cover plate 13 caused by stress.

[0422] Specifically, when the first cover plate 13 is embedded and welded to the second receiving groove 12120, the stress relief groove 133 can be used to release the stress generated by the welding, improve lateral heat conduction, and reduce the probability of damage or deformation of the first cover plate 13. At the same time, when the first cover plate 13 is a composite form including the first conductive member 131 and the second conductive member 132, the stress relief groove 133 can be set on the first conductive member 131 and located in the peripheral area of ​​the second conductive member 132. When the first conductive member 131 is embedded and welded to the second receiving groove 12120, the stress relief groove 133 can be used to release the stress generated by the welding, improve lateral heat conduction, and reduce the probability of damage or deformation of the second conductive member 132. Moreover, when the second conductive member 132 is embedded and welded to the first conductive member 131, the stress relief groove 133 can be used to release the stress generated by the welding, improve lateral heat conduction, and reduce the probability of deformation of the first conductive member 131, which may result in the first conductive member 131 being unable to be embedded in the second receiving groove 12120.

[0423] Please refer to Figures 48-49. In the embodiment of the present application, the shell assembly 1 can also be provided with a second cover plate 14 as needed. The second cover plate 14 is covered outside the first through hole 12130 and is simultaneously located outside the conductive part 22 in the second receiving groove 12120.

[0424] It is worth noting that when the housing assembly 1 includes the second cover plate 14, the housing assembly 1 may or may not include the first cover plate 13. Furthermore, when the housing assembly 1 includes both the second cover plate 14 and the first cover plate 13, the first cover plate 13 may be a composite of multiple materials or a non-composite of the same material.

[0425] In the above technical solution, at least a portion of the conductive portion 22 is located in the second receiving groove 12120, and the second cover plate 14 covers the conductive portion 22 of this portion. The second cover plate 14 also covers the first perforation 12130, so that when the electrolyte enters the second receiving groove 12120 from the first perforation 12130, the second cover plate 14 can improve the problem of overflow of this portion of the electrolyte from the first pole 12, thereby improving the reliability of the battery cell 10.

[0426] For example, as shown in Figures 48 and 49, when a portion of the conductive portion 22 is sandwiched between the second cover plate 14 and the second end wall 12121, laser welding can be used to weld the portion of the conductive portion 22, the second cover plate 14, and the second end wall 12121 together to improve the reliability of the connection between the first pole 12 and the conductive portion 22. Furthermore, because the second cover plate 14 can compress the conductive portion 22, the second cover plate 14 can be used to improve the stability of the conductive portion 22 within the second receiving groove 12120.

[0427] In the embodiment of the present application, the first pole 12 can be an integrally formed pole or a composite pole formed in separate parts. Referring again to Figures 48 and 49 , for example, the first pole 12 can include a first pole portion 124 and a second pole portion 125 made of different materials and electrically connected. The second pole portion 125 is located on a side of the first pole portion 124 away from the active material coating portion 21. The receiving portion 121 is provided on the first pole portion 124, or the receiving portion 121 is provided on the first pole portion 124 and the second pole portion 125. The conductive portion 22 is electrically connected to the first pole portion 124.

[0428] In the above technical solution, by setting the first pole 12 as a composite form composed of different materials, the first pole portion 124 located on the inner side is accommodated and electrically connected to the conductive portion 22, and the second pole portion 125 located on the outer side is electrically connected to the busbar component, etc., which is conducive to the assembly and electrical connection of the first pole 12 with related components, reducing the mutual interference between the electrical connection position of the first pole 12 and the conductive portion 22 and the electrical connection position of the first pole 12 and the busbar component of the battery 100, thereby improving the reliability and stability of the battery cell 10.

[0429] For example, when the material of the conductive part 22 is different from the material of the busbar component, the first pole part 124 can be set to the same material as the conductive part 22, and the second pole part 125 can be set to the same material as the busbar component, which is conducive to the welding of the second pole part 125 and the busbar component, and the welding of the first pole part 124 and the conductive part 22, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the first pole 12, as well as the reliability and stability of the electrical connection between the first pole 12 and the busbar component.

[0430] Furthermore, when the first pole 12 is a composite form of the above embodiments and has the second receiving groove 12120 and the first through-hole 12130 of any of the above embodiments, in some embodiments, the housing assembly 1 may also include the second cover plate 14 of any of the above embodiments. In this case, the second cover plate 14 and the first pole portion 124 may be made of the same material, and the first pole portion 124 and the second cover plate 14 may be electrically connected, thereby improving the reliability and stability of the electrical connection between the first pole portion 124 and the second cover plate 14. For example, the first pole portion 124 and the second cover plate 14 may be connected by welding.

[0431] For example, please refer to Figures 48-49. When the first pole 12 is a negative pole, the first pole portion 124 is made of copper, the second pole portion 125 is made of aluminum, and the conduit component is an aluminum sheet, then the second cover plate 14 can be set to copper, and the first cover plate 13 can be set to aluminum. At this time, the second cover plate 14 and the first pole portion 124 are made of the same material and can be effectively welded, the second pole portion 125 and the first cover plate 13 are made of the same material and can be effectively welded, and the first cover plate 13 and the conduit component are made of the same material and can be effectively welded.

[0432] In an embodiment of the present application, when the accommodating portion 121 has a second accommodating groove 12120, the matching conditions between the battery cell assembly 2 and the second accommodating groove 12120 are not limited according to the different structures of the battery cell assembly 2, and may include, but are not limited to, the following third and fourth embodiments.

[0433] FIG50 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Referring to FIG50 , in a third embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive portion 22 includes a tab portion 221 electrically connected to the current collector 211. The tab portion 221 includes a plurality of tabs 2211. The tabs 2211 converge near the current collector 211 to form a first gathered portion 2212. The tabs 2211 converge and connect to form a second gathered portion 2213 away from the current collector 211. The first gathered portion 2212 connects the second gathered portion 2213 and the active material coating portion 21. When the accommodating portion 121 has a second accommodating groove 12120, at least a portion of the second gathered portion 2213 is accommodated within the second accommodating groove 12120.

[0434] It is worth noting that the specific structure of the battery cell assembly 2 in this third embodiment is substantially the same as that of the battery cell assembly 2 in the first embodiment above. For details, reference may be made to the description of the first embodiment and will not be repeated here. In this third embodiment, because the tab portion 221 includes a second gathered portion 2213 formed by converging and connecting a plurality of tab sheets 2211, at least a portion of the second gathered portion 2213 can be easily accommodated within the second receiving groove 12120, facilitating assembly of the conductive portion 22 with the first pole 12.

[0435] In some optional examples, please refer to Figure 50, the position where the first gathering portion 2212 and the second gathering portion 2213 are connected can be set corresponding to the first through-hole 12130, that is, on the projection plane perpendicular to the axial direction R of the first pole 12, the orthographic projection of the position where the first gathering portion 2212 and the second gathering portion 2213 are connected is located within the orthographic projection range of the first through-hole 12130, thereby facilitating the second gathering portion 2213 to extend into the first through-hole 12130 at a shorter distance and enter the second accommodating groove 12120, thereby reducing redundancy and reducing costs.

[0436] It is understood that the folding position of the tab 2211 can be designed based on the position of the first through-hole 12130, for example, by adopting the symmetrical folding method described above or the asymmetrical folding method, so that the position where the first folding portion 2212 and the second folding portion 2213 connect is aligned with the first through-hole 12130. This will not be described in detail here. Furthermore, as mentioned above, when the second folding portion 2213 is formed into a sheet structure using ultrasonic pre-welding, it is easier for the second folding portion 2213 to pass through the first through-hole 12130.

[0437] Please refer to Figure 50. In this third embodiment, in addition to the second accommodating groove 12120, the accommodating portion 121 may also have a third accommodating groove 12140. The third accommodating groove 12140 is located on the side of the second accommodating groove 12120 close to the active material coating portion 21. The surface of the first pole 12 facing the active material coating portion 21 is the pole inner end face 122, and the notch of the third accommodating groove 12140 is formed on the pole inner end face 122. The third accommodating groove 12140 is connected to the second accommodating groove 12120 through the first through-hole 12130. At this time, at least part of the first retracted portion 2212 can be accommodated in the third accommodating groove 12140.

[0438] In the above technical solution, at least a portion of the first folded portion 2212 of the pole ear portion 221 is accommodated in the third accommodating groove 12140, and at least a portion of the second folded portion 2213 is accommodated in the second accommodating groove 12120, so that the space in the first pole 12 can be more fully utilized, and the space occupied by the pole ear portion 221 in the shell 11 can be further reduced to accommodate a larger active material coating portion 21, thereby improving the energy density of the battery cell 10, and can better reduce the redundancy of the pole ear portion 221 in the shell 11, further reduce the probability of short circuit between the pole ear portion 221 and the active material coating portion 21, and further reduce the risk of the pole ear portion 221 being inverted toward the active material coating portion 21.

[0439] It should be noted that the specific shape of the third receiving groove 12140 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. In the embodiment of the present application, the third receiving groove 12140 can be configured in a shape with a cross-sectional length greater than its width, such as a rectangular, elliptical, or racetrack-shaped shape, to facilitate the storage of the first gathering portion 2212.

[0440] In a third embodiment, the second folded portion 2213 is electrically connected directly or indirectly to the first terminal 12. For example, when the second folded portion 2213 is electrically connected directly to the first terminal 12, such as when the second folded portion 2213 is welded to the first terminal 12, the structure of the battery cell assembly 2 can be simplified, reducing parts, simplifying the assembly process, and improving assembly efficiency. The method and location of the direct electrical connection between the second folded portion 2213 and the first terminal 12 are not limited. For example, the electrical connection position between the second gathering portion 2213 and the first pole 12 can be located at the second end wall 12121 and / or the second side wall 12123. Furthermore, the electrical connection position between the second gathering portion 2213 and the second end wall 12121 can extend along the length direction or width direction of the second end wall 12121. Further, the second end wall 12121 has a second groove 12122, and the electrical connection position between the second gathering portion 2213 and the second end wall 12121 can be located in the second groove 12122, and so on. The corresponding technical effects can be referred to the introduction of the above embodiments and will not be repeated here.

[0441] As an optional solution, the conductive portion 22 can also be provided with a transition piece 222 as required, in which case the second retracted portion 2213 is indirectly electrically connected to the first pole 12. Specifically, FIG51 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Referring to FIG51, when the conductive portion 22 includes a transition piece 222, the transition piece 222 is connected to the second retracted portion 2213, and the conductive portion 22 is electrically connected to the first pole 12 via the transition piece 222. At this time, at least a portion of the transition piece 222 is accommodated in the second receiving groove 12120. In this example, at least a portion of the second retracted portion 2213 is also accommodated in the second receiving groove 12120.

[0442] In the above technical solution, the active material coating portion 21 can be electrically connected to the first electrode 12 through the first gathered portion 2212, the second gathered portion 2213, and the adapter plate 222 in sequence. The location where the conductive portion 22 is electrically connected to the first electrode 12 is located on the adapter plate 222. For example, the electrical connection can be achieved by welding (e.g., laser welding) the adapter plate 222 to the first electrode 12. In addition, the adapter plate 222 and the tab 2211 are two separate components and are connected by welding (e.g., ultrasonic welding).

[0443] In the above technical solution, by accommodating at least a portion of the second folded portion 2213 and at least a portion of the adapter plate 222 within the second receiving groove 12120, the space within the first terminal 12 can be more fully utilized, further reducing the space occupied by the conductive portion 22 within the housing 11, thereby further improving the volumetric energy density of the battery cell 10. Furthermore, by providing the adapter plate 222 with a sheet structure, the adapter plate 222 can be easily inserted through the first through-hole 12130 and extended into the second receiving groove 12120.

[0444] In addition, by using the adapter plate 222 to achieve indirect electrical connection between the second retracted portion 2213 and the first pole 12, the adapter plate 222 can be welded to the first pole 12 at a position avoiding the second retracted portion 2213, so that the welding between the adapter plate 222 and the first pole 12 is firm, the risk of welding cracking is small, and the reliability and stability of the battery cell 10 can be further improved; at the same time, by electrically connecting the first pole 12 and the pole tab 2211 through the adapter plate 222, the structure of the pole tab 2211 can also be simplified.

[0445] The manner and position of direct electrical connection between the adapter plate 222 and the first pole 12 are not limited. For example, the adapter plate 222 is electrically connected to the first pole 12 by welding. For example, the electrical connection position between the adapter plate 222 and the first pole 12 can be located on the second end wall 12121 and / or the second side wall 12123. Furthermore, the position where the adapter plate 222 is electrically connected to the second end wall 12121 can extend along the length direction or width direction of the second end wall 12121. Furthermore, the second end wall 12121 has a second recess 12122, and the position where the adapter plate 222 is electrically connected to the second end wall 12121 can be located within the second recess 12122, and so on. The corresponding technical effects can be referred to the description of the above embodiment and will not be elaborated here. When the electrical connection position between the adapter plate 222 and the first pole 12 is located at the second end wall 12121 and / or the second side wall 12123, since at least part of the adapter plate 222 is accommodated in the second accommodating groove 12120, the structure of the adapter plate 222 can be simplified, redundancy can be reduced, and cost can be lowered.

[0446] Referring to FIG. 51 , in a fourth embodiment, the active material coating portion 21 includes a current collector 211 and an active material layer 212 disposed on the current collector 211. The conductive portion 22 includes a tab portion 221 and a transition piece 222. The tab portion 221 includes a plurality of tabs 2211 electrically connected to the current collector 211. The plurality of tabs 2211 converge near the current collector 211 to form a first gathered portion 2212. The plurality of tabs 2211 converge and connect to form a second gathered portion 2213 away from the current collector 211. The transition piece 222 is electrically connected to the second gathered portion 2213. When the accommodating portion 121 includes a second accommodating groove 12120, at least a portion of the transition piece 222 can be accommodated in the second accommodating groove 12120 and electrically connected to the first electrode 12.

[0447] In the above technical solution, compared with the above third solution including the adapter plate 222, in this fourth solution, at least part of the adapter plate 222 is accommodated in the second accommodating groove 12120, but the relative position of the pole ear portion 221 and the second accommodating groove 12120 is not limited, that is, at least part of the pole ear portion 221 can be accommodated in the second accommodating groove 12120, and the pole ear portion 221 can also be completely located outside the second accommodating groove 12120, thereby meeting different structural design requirements.

[0448] In the above technical solution, by accommodating at least a portion of the adapter plate 222 in the second accommodating groove 12120, the adapter plate 222 can occupy the space in the first pole 12, thereby reducing the space occupied by the adapter plate 222 in the shell 11 to accommodate a larger active material coating part 21, thereby improving the energy density of the battery cell 10, and reducing the probability of short-circuiting between the adapter plate 222 and the active material coating part 21, reducing the risk of short-circuiting the battery cell assembly 2, and improving the stability and reliability of the battery cell 10.

[0449] In addition, by using the adapter plate 222 to achieve indirect electrical connection between the second retracted portion 2213 and the first pole 12, the adapter plate 222 can be welded to the first pole 12 at a position avoiding the second retracted portion 2213, so that the welding between the adapter plate 222 and the first pole 12 is firm, the risk of welding cracking is small, and the reliability and stability of the battery cell 10 can be further improved; at the same time, by electrically connecting the first pole 12 and the pole tab 2211 through the adapter plate 222, the structure of the pole tab 2211 can also be simplified.

[0450] Figure 52 is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application. Please refer to Figure 52. In some other embodiments of the present application, the accommodating portion 121 has a fourth accommodating groove 12150, and the fourth accommodating groove 12150 is a groove body, which is a groove-shaped structure with a certain depth. The surface of the first pole 12 away from the active material coating portion 21 is the pole outer end face 123, and the notch of the fourth accommodating groove 12150 is formed on the pole outer end face 123. The fourth accommodating groove 12150 is connected to the interior of the shell 11 through the second through-hole 12160. The conductive part 22 may not be accommodated in the fourth accommodating groove 12150. For example, the conductive part 22 may be passed through the second through-hole 12160, and the electrical connection position between the conductive part 22 and the first pole 12 is located at the hole wall of the second through-hole 12160 formed by the first pole 12.

[0451] In the above embodiment, by providing the fourth receiving groove 12150, it is possible to easily achieve electrical connection between the conductive portion 22 and the wall of the second through-hole 12160. Furthermore, in some cases, the electrical connection between the conductive portion 22 and the first electrode 12 can be utilized to seal the second through-hole 12160. For example, the conductive portion 22 can be welded to the wall of the second through-hole 12160 at the location where the second through-hole 12160 connects to the fourth receiving groove 12150, thereby facilitating the operation. Furthermore, by controlling the weld mark, the weld mark and the conductive portion 22 can be utilized to seal the second through-hole 12160, thereby improving the problem of electrolyte leakage from the housing 11 through the second through-hole 12160.

[0452] It should be noted that the specific shape of the fourth accommodating groove 12150 is not limited, and can be a regular shape or an irregular shape, such as a cylindrical groove with a rectangular, elliptical, or runway-shaped cross-section, or a trapezoidal groove with a rectangular cross-section and a gradually changing cross-sectional size, or a hemispherical groove with a circular cross-section and a gradually changing cross-sectional size, or a semi-ellipsoidal groove with an elliptical cross-section and a gradually changing cross-sectional size, etc.

[0453] In the embodiment of the present application, the second through-hole 12160 can be in the form of an elongated strip to match the shape of the sheet-shaped portion of the conductive portion 22, thereby facilitating the passage of the sheet-shaped portion of the conductive portion 22. Furthermore, when the second through-hole 12160 is in the form of an elongated strip, the fourth receiving slot 12150 can also be configured in a shape where the cross-section is longer than the width, such as a rectangular, elliptical, or racetrack shape. In this case, the length direction of the second through-hole 12160 can be aligned with the length direction of the cross-section of the fourth receiving slot 12150, thereby fully utilizing the space.

[0454] It should be noted that the accommodating portion 121 of the embodiment of the present application is not limited to the above-mentioned form of having at least one accommodating groove. For example, in some other embodiments of the present application, FIG53 is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application. Referring to FIG53 , the accommodating portion 121 may only have the third through-hole 12170, the surface of the first pole 12 facing the active material coating portion 21 is the pole inner end face 122, and the surface of the first pole 12 away from the active material coating portion 21 is the pole outer end face 123. The third through-hole 12170 is in the form of a through-hole and passes through the pole inner end face 122 and the pole outer end face 123. At least a portion of the conductive portion 22 is provided through the third through-hole 12170. The electrical connection position between the conductive portion 22 and the first pole 12 is not limited. For example, the electrical connection position can be located on the wall of the third through-hole 12170 formed in the first pole 12, or the conductive portion 22 can also pass through the third through-hole 12170 so that the electrical connection position is located on the pole outer end surface 123 outside the third through-hole 12170. In addition, the shape of the third through-hole 12170 is not limited. It can be a regular-shaped hole with a uniform cross-section, or a variable-shaped hole with unequal cross-sections, etc. Furthermore, the cross-sectional shape of the third through-hole 12170 is not limited. For example, it can be an elongated strip, such as a rectangle, an ellipse, or a racetrack, etc., to match the sheet-shaped partial shape of the conductive portion 22, thereby facilitating the sheet-shaped partial portion of the conductive portion 22 to pass through the third through-hole 12170. This will not be described in detail here.

[0455] Figure 54 is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application, Figure 55 is a schematic diagram of the cooperation between the battery cell assembly 2 and the bracket 3 provided in some embodiments of the present application, and Figure 56 is a cross-sectional view along the CC line in Figure 55; please refer to Figures 54-56 in combination. In the embodiments of the present application, the battery cell 10 also includes a bracket 3, which is located in the shell 11, and the bracket 3 is located on the side of the active m...

Claims

1. A housing assembly (1), wherein: include: A housing (11), wherein the housing (11) is formed with a mounting hole (113); A first pole (12), the first pole (12) comprising an integrally formed pole body (12a), a first limiting platform (12b) and a second limiting platform (12c), the pole body (12a) being inserted through the mounting hole (113), the first limiting platform (12b) and the second limiting platform (12c) being arranged at two ends of the pole body (12a) along an axial direction (Z) of the mounting hole (113), and the first limiting platform (12b) being limitedly matched to the outer side of the shell (11), and the second limiting platform (12c) being limitedly matched to the inner side of the shell (11), so that the first pole (12) is riveted to the shell (11).

2. The housing assembly (1) according to claim 1, wherein: Taking the cross section of the mounting hole (113) as the projection surface (Ω), and taking the axial direction (Z) of the mounting hole (113) as the projection direction, At least part of a circumferential profile (R1) of a projection of the first limit platform (12b) on the projection surface (Ω) is a straight line; and / or at least part of a circumferential profile (R2) of a projection of the second limit platform (12c) on the projection surface (Ω) is a straight line.

3. The housing assembly (1) according to claim 1, wherein: Taking the cross section of the mounting hole (113) as the projection surface (Ω), and taking the axial direction (Z) of the mounting hole (113) as the projection direction, The circumferential profile (R1) of the projection of the first limiting platform (12b) on the projection surface (Ω) is composed of a combination of straight lines and arcs; and / or the circumferential profile (R2) of the projection of the second limiting platform (12c) on the projection surface (Ω) is composed of a combination of straight lines and arcs.

4. The housing assembly (1) according to claim 3, wherein: Taking the cross section of the mounting hole (113) as the projection surface (Ω), and taking the axial direction (Z) of the mounting hole (113) as the projection direction, The circumferential contour (R1) of the projection of the first limit platform (12b) on the projection surface (Ω) includes two straight lines and two arcs, the two straight lines are opposite to each other and are arranged at an interval, and the opposite ends of the two straight lines are respectively connected by an arc; and / or the circumferential contour (R2) of the projection of the second limit platform (12c) on the projection surface (Ω) includes two straight lines and two arcs, the two straight lines are opposite to each other and are arranged at an interval, and the opposite ends of the two straight lines are respectively connected by an arc.

5. The housing assembly (1) according to claim 1, wherein: The cross section of the mounting hole (113) is taken as a projection surface (Ω), and the axial direction (Z) of the mounting hole (113) is taken as a projection direction; The dimension (L1) of the projection of the first limiting platform (12b) on the projection plane (Ω) in the first direction is greater than the dimension (L2) of the projection of the first limiting platform (12b) on the projection plane (Ω) in the second direction; and / or the dimension (L3) of the projection of the second limiting platform (12c) on the projection plane (Ω) in the first direction is greater than the dimension (L4) of the projection of the second limiting platform (12c) on the projection plane (Ω) in the second direction; The first direction (X), the second direction (Y) and the axial direction (Z) are perpendicular to each other.

6. The housing assembly (1) according to claim 5, wherein: The dimension (L1) of the projection of the first limit platform (12b) on the projection plane (Ω) in the first direction is greater than three times the dimension (L2) of the first limit platform (12b) in the second direction; and / or the dimension (L3) of the projection of the second limit platform (12c) on the projection plane (Ω) in the first direction is greater than three times the dimension (L4) of the second limit platform (12c) in the second direction.

7. The housing assembly (1) according to claim 5, wherein: The housing (11) has a first wall (110), the mounting hole (113) is formed in the first wall (110), the first direction is the length direction of the first wall (110), and the second direction is the width direction of the first wall (110).

8. The housing assembly (1) according to claim 7, wherein: The length dimension (L5) of the pole body (12a) in the first direction is greater than or equal to 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction; and / or, The width dimension (L6) of the pole body (12a) in the second direction is greater than or equal to 1 / 4 of the width dimension (b0) of the first wall (110) in the second direction; and / or, The cross-sectional area of ​​the portion of the pole body (12a) that matches the mounting hole (113) is greater than or equal to 4% of the area of ​​the first wall (110); and / or, Along the axial direction (Z) of the mounting hole (113), a ratio of a thickness dimension (t) of the pole body (12a) to a thickness dimension (t0) of the first wall (110) is greater than 1 and less than 1.

5.

9. The housing assembly (1) according to claim 7, wherein: The length dimension (L5) of the pole body (12a) in the first direction is greater than or equal to 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction; and / or, The width dimension (L6) of the pole body (12a) in the second direction is greater than or equal to 1 / 2 of the width dimension (b0) of the first wall (110) in the second direction; and / or, The circumference of the pole body (12a) matched with the mounting hole (113) is greater than or equal to 25% of the circumference of the first wall (110); and / or, The cross-sectional area of ​​the portion of the pole body (12a) that matches the mounting hole (113) is greater than or equal to 10% of the area of ​​the first wall (110); and / or, Along the axial direction (Z) of the mounting hole (113), the thickness dimension (t) of the pole body (12a) is equal to the thickness dimension (t) of the first wall The ratio of the thickness dimension (t0) of (110) is greater than 1 and less than 1.

5.

10. The housing assembly (1) according to claim 7, wherein: The length dimension (L1) of the first limiting platform (12b) in the first direction is greater than or equal to 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction; and / or, The width dimension (L2) of the first limiting platform (12b) in the second direction is greater than or equal to 1 / 4 of the width dimension (b0) of the first wall (110) in the second direction; and / or, The cross-sectional area of ​​the first limiting platform (12b) is greater than or equal to 4.5% of the area of ​​the first wall (110); and / or, Along the axial direction of the mounting hole (113), a thickness dimension (t1) of the first limiting platform (12b) is greater than or equal to 0.6 of a thickness dimension (t0) of the first wall (110), and less than or equal to 1.5 of a thickness dimension (t0) of the first wall (110).

11. The housing assembly (1) according to claim 7, wherein: The length dimension (L1) of the first limiting platform (12b) in the first direction is greater than or equal to 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction; and / or, The width dimension (L2) of the first limiting platform (12b) in the second direction is greater than or equal to 1 / 2 of the width dimension (b0) of the first wall (110) in the second direction; and / or, The first limiting platform (12b) is columnar, and the circumference of the outer periphery of the first limiting platform (12b) is greater than or equal to 30% of the circumference of the first wall (110); and / or, The cross-sectional area of ​​the first limiting platform (12b) is greater than or equal to 9% of the area of ​​the first wall (110); and / or, Along the axial direction of the mounting hole (113), a thickness dimension (t1) of the first limiting platform (12b) is greater than or equal to 0.6 of a thickness dimension (t0) of the first wall (110), and less than or equal to 1.5 of a thickness dimension (t0) of the first wall (110).

12. The housing assembly (1) according to claim 7, wherein: The length dimension (L3) of the second limiting platform (12c) in the first direction is greater than or equal to 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction; and / or, The width dimension (L4) of the second limiting platform (12c) in the second direction is greater than or equal to 1 / 4 of the width dimension (b0) of the first wall (110) in the second direction; and / or, The cross-sectional area of ​​the second limiting platform (12c) is greater than or equal to 4.5% of the area of ​​the first wall (110); and / or, Along the axial direction of the mounting hole (113), the thickness dimension (t2) of the second limiting platform (12c) is greater than or equal to 0.6 of the thickness dimension (t0) of the first wall (110), and less than or equal to 1.5 of the thickness dimension (t0) of the first wall (110).

13. The housing assembly (1) according to claim 7, wherein: The length dimension (L3) of the second limiting platform (12c) in the first direction is greater than or equal to 1 / 3 of the length dimension (a0) of the first wall (110) in the first direction; and / or, The width dimension (L4) of the second limiting platform (12c) in the second direction is greater than or equal to the first wall (110). 1 / 2 of the width dimension (b0) in the second direction; and / or, The second limiting platform (12c) is columnar, and the circumference of the outer periphery of the second limiting platform (12c) is greater than or equal to 30% of the circumference of the first wall (110); and / or, The cross-sectional area of ​​the second limiting platform (12c) is greater than or equal to 9% of the area of ​​the first wall (110); and / or, Along the axial direction of the mounting hole (113), the thickness dimension (t2) of the second limiting platform (12c) is greater than or equal to 0.6 of the thickness dimension (t0) of the first wall (110), and less than or equal to 1.5 of the thickness dimension (t0) of the first wall (110).

14. The housing assembly (1) according to any one of claims 1 to 13, wherein: The housing (11) has a first wall (110), the first wall (110) is formed with two mounting holes (113), the two mounting holes (113) are respectively provided with two first poles (12), and the polarities of the two first poles (12) are opposite; or, The housing (11) has a first wall (110), the first wall (110) is formed with four mounting holes (113), the four mounting holes (113) are respectively provided with four first poles (12), and the four first poles (12) have the same polarity in pairs; or, The housing (11) comprises a first wall (110) and a second wall (11b); the second wall (11b) is arranged at an angle to or opposite to the first wall (110) and spaced apart; the first wall (110) and the second wall (11b) are respectively provided with the mounting holes (113); the mounting holes (113) of the first wall (110) and the mounting holes (113) of the second wall (11b) are respectively provided with one first pole (12); the polarities of the two first poles (12) are opposite; or, The shell (11) has a first wall (110), two mounting holes (113) are formed on the first wall (110), and two first poles (12) with the same polarity are respectively arranged in the two mounting holes (113); the shell (11) has a second wall (11b) which is arranged at an angle or opposite to the first wall (110) and spaced apart; the second wall (11b) has two mounting holes (113), and one first pole (12) is respectively arranged in the two mounting holes (113) of the second wall (11b); the polarity of the two first poles (12) of the second wall (11b) is the same, and opposite to the polarity of the first pole (12) of the first wall (110).

15. The housing assembly (1) according to any one of claims 1 to 14, wherein: Also includes: An insulating sealing component (8) is provided between the first pole (12) and the housing (11).

16. The housing assembly (1) according to claim 15, wherein: The insulating sealing component (8) comprises: An insulating member (81), the insulating member (81) being arranged between the first limiting platform (12b) and the housing (11); A first sealing member (82), wherein the first sealing member (82) is disposed between the second limiting platform (12c) and the housing (11), and a portion of the insulating member (81) and / or a portion of the first sealing member (82) is fitted between the pole body (12a) and the peripheral wall of the mounting hole (113).

17. The housing assembly (1) according to claim 16, wherein: The outer side wall of the housing (11) is formed with a first matching groove (11c), and the first matching groove (11c) is used to accommodate the insulating member (81).

18. The housing assembly (1) according to claim 16, wherein: The inner side wall of the housing (11) is formed with a matching protrusion (11d), and the matching protrusion (11d) is in abutment with the first sealing member (82).

19. A battery cell (10), wherein: It comprises a battery cell assembly (2) and a shell assembly (1) according to any one of claims 1 to 18, wherein the battery cell assembly (2) is arranged in the shell (11) and is electrically connected to the first pole (12).

20. The battery cell (10) according to claim 19, wherein: The battery cell assembly (2) comprises an active material coating portion (21) and a conductive portion (22), wherein the active material coating portion (21) is accommodated in the housing (11), and the conductive portion (22) is used to electrically connect the active material coating portion (21) and the first pole (12); The first pole (12) is provided with a receiving portion (121), and at least a portion of the conductive portion (22) is received in the receiving portion (121).

21. The battery cell (10) according to claim 20, wherein: The accommodating portion (121) has a first accommodating groove (12110); the surface of the first pole (12) facing the active material coating portion (21) is the pole inner end face (122); a notch of the first accommodating groove (12110) is formed on the pole inner end face (122); and at least a portion of the conductive portion (22) is accommodated in the first accommodating groove (12110).

22. The battery cell (10) according to claim 21, wherein: The groove wall of the first accommodating groove (12110) has a first recessed groove (12112), and the position where the conductive part (22) is electrically connected to the first pole (12) is at least partially located in the first recessed groove (12112).

23. The battery cell (10) according to claim 21 or 22, wherein: The first pole (12) has a first groove (126); a surface of the first pole (12) away from the active material coating portion (21) is a pole outer end surface (123); and a notch of the first groove (126) is formed on the pole outer end surface (123).

24. The battery cell (10) according to claim 23, wherein: The battery cell (10) further comprises a slot cover (7), wherein the slot cover (7) is arranged on the first pole (12) and covers the slot opening of the first groove (126).

25. The battery cell (10) according to claim 20, wherein: The accommodating portion (121) has a second accommodating groove (12120); the surface of the first pole (12) away from the active material coating portion (21) is the pole outer end face (123); the notch of the second accommodating groove (12120) is formed on the pole outer end face (123); the second accommodating groove (12120) is connected to the interior of the shell (11) through a first through hole (12130); the conductive portion (22) is passed through the first through hole (12130) and is at least partially accommodated in the second accommodating groove (12120).

26. The battery cell (10) according to claim 25, wherein: The second receiving groove has a second sink groove (12122), and the position where the conductive part (22) is electrically connected to the first pole (12) is at least partially located in the second sink groove (12122).

27. The battery cell (10) according to claim 25 or 26, wherein: The housing assembly (1) further comprises a first cover plate (13), the first cover plate (13) cooperates with the first pole (12) and closes the notch of the second receiving groove (12120), and the first cover plate (13) is electrically connected to the first pole (12).

28. The battery cell (10) according to any one of claims 25 to 27, wherein: The housing assembly (1) further comprises a second cover plate (14), wherein the second cover plate (14) covers the first through hole (12130) and the outside of the conductive portion (22) located in the second receiving groove (12120).

29. The battery cell (10) according to any one of claims 20 to 28, wherein: Also includes: A bracket (3) is located inside the housing (11) and on a side of the active material coating portion (21) close to the first pole (12); the bracket (3) has an avoidance hole (31) for avoiding the conductive portion (22); the conductive portion (22) is suitable for extending to a side of the bracket (3) away from the active material coating portion (21) through the avoidance hole (31).

30. The battery cell (10) according to claim 29, wherein: The bracket (3) is provided with a guide portion (32), the guide portion (32) surrounds and forms at least a portion of the avoidance hole (31), and the guide portion (32) at least partially extends to the accommodating portion (121).

31. The battery cell (10) according to claim 29 or 30, wherein: The avoidance hole (31) comprises a first hole segment (311) and a second hole segment (312), the second hole segment (312) being located on a side of the first hole segment (311) close to the active material coating portion (21), and the cross-sectional area of ​​the second hole segment (312) gradually increases in a direction away from the first hole segment (311), the active material coating portion (21) comprises a current collector (211) and an active material layer (212) disposed on the current collector (211), the conductive portion (22) comprises a pole ear portion (221) electrically connected to the current collector (211), the pole ear portion (221) The invention comprises a plurality of pole lugs (2211), wherein the plurality of pole lugs (2211) converge at positions close to the current collector (211) to form a first gathered portion (2212), and the plurality of pole lugs (2211) converge at positions away from the current collector (211) and are connected to form a second gathered portion (2213), wherein the first gathered portion (2212) connects the second gathered portion (2213) and the active material coating portion (21), wherein at least a portion of the first gathered portion (2212) is accommodated in the second hole segment (312), and the second gathered portion (2213) is penetrated through the first hole segment (311).

32. The battery cell (10) according to any one of claims 29 to 31, wherein: The bracket (3) is an integrated structure; or, the bracket (3) is a split structure and comprises a detachable first bracket (33) and a second bracket (34), wherein the avoidance hole (31) is defined between the first bracket (33) and the second bracket (34).

33. The battery cell (10) according to any one of claims 29 to 32, wherein: Also includes: An internal insulating member (4), the internal insulating member (4) is located inside the shell (11) and wrapped around the active material coating portion (21), and is connected to the bracket (3).

34. The battery cell (10) according to any one of claims 19 to 33, wherein: The housing assembly (1) comprises a plurality of poles, at least one of the poles being the first pole (12).

35. The battery cell (10) according to claim 34, wherein: The shell (11) has a pressure relief portion (16), and the pressure relief portion (16) and the first pole (12) are located on the same side surface of the shell (11); or the pressure relief portion (16) and the pole are located on two surfaces on different sides of the shell (11).

36. The battery cell (10) according to any one of claims 19 to 35, wherein: The shell (11) is provided with a pressure relief portion (16). The shell (11) comprises a shell body (111) and a shell cover (112). One end of the shell body (111) is open. The shell cover (112) is arranged at the open end of the shell body (111). The pressure relief portion (16) is arranged on the shell cover (112).

37. A battery (100), wherein: The invention comprises a battery cell (10) according to any one of claims 19 to 36.

38. An electrical device (1000), wherein: Comprising a battery (100) according to claim 37.

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