Cylindrical battery monomer, battery device and power utilization device

Abstract

The utility model provides a cylindrical battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. A cylindrical battery cell includes a housing, an electrode terminal, an electrode assembly, a seal, a first insulator, and a second insulator. The electrode terminal is provided on a wall portion of the case. The electrode assembly comprises a main body part and a first tab; the first tab is arranged at one end of the main body part and is electrically connected with the electrode terminal; the sealing piece comprises a first sealing part positioned between the wall part and the first limiting part of the electrode terminal; the first sealing part exceeds the first limiting part in the direction deviating from the central axis of the cylindrical battery monomer. The first insulating part comprises a first insulating part arranged between the wall part and the first tab, the first insulating part is provided with a through hole, the first sealing part is located in the through hole, and a first gap is formed between the first sealing part and the hole wall surface of the through hole. The second insulating part is located between the wall part and the first tab, and the projection of the second insulating part in the thickness direction of the wall part covers at least part of the first gap, so that the risk of electric breakdown of the first tab and the wall part is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a cylindrical battery monomer, a battery device and a power utilization device. BACKGROUND

[0002] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, the battery as a core component of new energy vehicles has higher requirements in terms of use stability and use reliability.

[0003] In the battery technology, the cylindrical battery monomer includes a shell and an electrode assembly contained in the shell. The electrode assembly is formed with a tab. The tab is used to electrically connect with the electrode terminal arranged on the shell to realize the input or output of the electric energy of the cylindrical battery monomer. However, the existing cylindrical battery monomer is prone to short circuit between the tab and the shell during use, which may cause the risk of internal short circuit of the cylindrical battery monomer, thereby being not conducive to improving the use reliability of the cylindrical battery monomer. CONTENT OF THE INVENTION

[0004] The present application provides a cylindrical battery monomer, a battery device and a power utilization device, which can effectively improve the use reliability of the cylindrical battery monomer.

[0005] In a first aspect, the embodiments of the present application provide a cylindrical battery cell, comprising a shell, an electrode terminal, an electrode assembly, a sealing member, a first insulating member and a second insulating member; the shell has a wall portion, a thickness direction of the wall portion is an axial direction of the cylindrical battery cell, the wall portion is provided with a mounting hole, the mounting hole penetrates the wall portion along the thickness direction of the wall portion; the electrode terminal is arranged in the mounting hole, the electrode terminal comprises a first limiting portion located on a side of the wall portion facing an inside of the shell; the electrode assembly is accommodated in the shell, the electrode assembly comprises a main body portion and a first tab, the first tab is protruded on an end of the main body portion facing the wall portion and is electrically connected with the electrode terminal; the sealing member is made of insulating material, the sealing member comprises a first sealing portion, the first sealing portion is located between the wall portion and the first limiting portion in the thickness direction of the wall portion, and the first sealing portion exceeds the first limiting portion in a direction away from a central axis of the cylindrical battery cell in a radial direction of the cylindrical battery cell; the first insulating member comprises a first insulating portion arranged between the wall portion and the first tab in the thickness direction of the wall portion, the first insulating portion is provided with a through hole, the through hole penetrates the first insulating portion along the thickness direction of the wall portion, at least part of the first sealing portion and the first limiting portion are located in the through hole, and a first gap is formed between the first sealing portion and a hole wall surface of the through hole in the radial direction of the cylindrical battery cell; the second insulating member is located between the wall portion and the first tab in the thickness direction of the wall portion, and a projection of the second insulating member in the thickness direction of the wall portion covers at least part of the first gap.

[0006] In the technical scheme, the sealing member comprises a first sealing part arranged between the first limiting part of the electrode terminal and the wall part, so that the sealing member can seal the gap between the electrode terminal and the wall part, thereby relieving the risk of leakage of the cylindrical battery cell from the mounting hole during use, and the first sealing part of the sealing member is arranged in the through hole and beyond the first limiting part in the radial direction of the cylindrical battery cell away from the central axis of the cylindrical battery cell, so that a first gap is formed between the first sealing part and the hole wall surface of the through hole, facilitating assembly of the first sealing part of the sealing member in the through hole, and facilitating reduction of assembly interference between the first sealing part of the sealing member and the first insulating part of the first insulating member. The second insulating member is arranged between the wall part and the first tab, and the projection of the second insulating member in the thickness direction of the wall part covers at least part of the first gap between the first sealing part and the first insulating part, so that the second insulating member can shield the first gap, thereby increasing the creepage distance of the wall part and the first tab at the first gap, and the second insulating member can play a certain blocking role between the first tab and the wall part, thereby effectively relieving the phenomenon of the first tab being inserted into the first gap and overlapping the wall part or the first tab being electrically broken at the first gap, and facilitating reduction of the risk of internal short circuit of the cylindrical battery cell during use, thereby improving the use reliability of the cylindrical battery cell.

[0007] In some embodiments, the projection of the second insulating member in the thickness direction of the wall part covers the entire first gap.

[0008] In the technical scheme, the projection of the second insulating member in the thickness direction of the wall part is arranged to cover the entire first gap between the first sealing part and the first insulating part, thereby further improving the blocking effect of the second insulating member on the first tab and the wall part at the first gap, thereby further relieving the phenomenon of the first tab being inserted into the first gap and overlapping the wall part or the first tab being electrically broken at the first gap, and facilitating further reduction of the risk of internal short circuit of the cylindrical battery cell during use.

[0009] In some embodiments, the second insulating member is protruded on the hole wall surface of the through hole.

[0010] In the technical scheme, the second insulating member is arranged to be protruded on the hole wall surface of the through hole of the first insulating part, so that the second insulating member is connected to the hole wall surface of the first insulating part, and the second insulating member and the first insulating part share part of the space in the thickness direction of the wall part, thereby relieving the phenomenon of the second insulating member occupying the space between the wall part and the first insulating part or between the first tab and the first insulating part in the thickness direction of the wall part, thereby improving the internal space utilization of the cylindrical battery cell and improving the energy density of the cylindrical battery cell.

[0011] In some embodiments, the second insulating piece is integrally formed with the first insulating portion.

[0012] In the above technical solution, by setting the second insulating piece and the first insulating portion of the first insulating piece as an integrally formed structure, on the one hand, the stability and reliability of the second insulating piece protruding on the hole wall surface of the through hole of the first insulating portion can be improved, which is conducive to reducing the risk of the second insulating piece falling off from the first insulating portion during use, so as to improve the reliability of the second insulating piece shielding the first gap, on the other hand, the difficulty of setting the second insulating piece on the hole wall surface of the through hole of the first insulating portion can be reduced, which is conducive to reducing the manufacturing difficulty of the cylindrical battery monomer.

[0013] In some embodiments, the cylindrical battery monomer further comprises a first current collecting member, the first current collecting member is arranged between the first insulating portion and the first tab, the first current collecting member connects the electrode terminal and the first tab to electrically connect the electrode terminal and the first tab; wherein, along the thickness direction of the wall portion, the second insulating piece is arranged between the first insulating portion and the first current collecting member.

[0014] In the above technical solution, by setting the second insulating piece between the first insulating portion and the first current collecting member, the assembly difficulty of the second insulating piece can be reduced, so as to improve the production efficiency of the cylindrical battery monomer.

[0015] In some embodiments, the second insulating piece is connected to the surface of the first current collecting member facing the first insulating portion.

[0016] In the above technical solution, by setting the second insulating piece as a structure connected to the surface of the first current collecting member facing the wall portion, on the one hand, the stability and reliability of the second insulating piece arranged between the first insulating portion and the first current collecting member can be improved, which is conducive to reducing the phenomenon of the second insulating piece moving or shifting during use, on the other hand, the second insulating piece can be set on the first current collecting member and then assembled into the shell together with the first current collecting member, which is conducive to reducing the assembly difficulty of the second insulating piece and optimizing the production rhythm of the cylindrical battery monomer.

[0017] In some embodiments, the second insulating piece is connected to the surface of the first insulating portion facing the first current collecting member.

[0018] In the technical scheme, the second insulation part is arranged on the surface of the first insulation part facing the first current collecting member, which can improve the stability and reliability of the arrangement of the second insulation part between the first insulation part and the first current collecting member, and reduce the movement or displacement of the second insulation part during use, and the first current collecting member can be assembled after the second insulation part is assembled on the first insulation part and the first gap is shielded, which can reduce the assembly difficulty of the second insulation part and improve the shielding effect of the second insulation part on the first gap.

[0019] In some embodiments, the first current collecting member comprises a terminal connecting area connected with the electrode terminal; wherein, in a projection plane perpendicular to the thickness direction of the wall part, the orthographic projection of the terminal connecting area does not overlap with the orthographic projection of the second insulation part.

[0020] In the technical scheme, the terminal connecting area of the first current collecting member connected with the electrode terminal is arranged in a structure that the projection of the terminal connecting area in the thickness direction of the wall part does not overlap with the projection of the second insulation part in the thickness direction of the wall part, which can reduce the shielding and interference of the second insulation part on the terminal connecting area, reduce the connection difficulty between the terminal connecting area and the electrode terminal, and improve the assembly quality between the terminal connecting area and the electrode terminal.

[0021] In some embodiments, the terminal connecting area is welded with the electrode terminal to form a connecting part, and the connecting part and the second insulation part are arranged at intervals in the radial direction of the cylindrical battery cell and the interval is greater than or equal to 5 mm.

[0022] In the technical scheme, the second insulation part and the connecting part are arranged at intervals in the radial direction of the cylindrical battery cell and the interval distance is greater than or equal to 5 mm, which can improve the separation distance of the second insulation part and the connecting part in the radial direction of the cylindrical battery cell, reduce the risk of damage of the second insulation part by the high temperature of the connecting part during the welding connection of the terminal connecting area and the electrode terminal to form the connecting part, and reduce the insulation failure of the second insulation part after being damaged, thereby improving the production quality and use reliability of the cylindrical battery cell.

[0023] In some embodiments, along the thickness direction of the wall part, the second insulation part is arranged between the first insulation part and the wall part.

[0024] In the technical scheme, the second insulation part is arranged between the first insulation part and the wall part, which can reduce the shielding and interference between the second insulation part and the terminal connecting area, and reduce the connection difficulty between the terminal connecting area and the electrode terminal.

[0025] In some embodiments, the second insulation member is connected to a surface of the wall portion facing the first insulation portion.

[0026] In the above technical solution, by setting the second insulation member as connected to the surface of the wall portion facing the first insulation portion, the stability and reliability of the second insulation member arranged between the wall portion and the first insulation portion are improved, so as to reduce the phenomenon of the second insulation member moving or shifting during use.

[0027] In some embodiments, in a projection plane perpendicular to the thickness direction of the wall portion, the second insulation member partially overlaps the first sealing portion in the projection.

[0028] In the above technical solution, by setting the projection of the second insulation member and the first sealing portion in the thickness direction of the wall portion to partially overlap each other, the second insulation member is partially located between the first sealing portion of the sealing member and the wall portion in the thickness direction of the wall portion, so as to further improve the stability and reliability of the second insulation member arranged between the wall portion and the first insulation portion, to further reduce the phenomenon of the second insulation member moving or shifting during use, and to further improve the shielding effect of the second insulation member on the first gap, so as to further reduce the risk of short circuit or electrical breakdown of the wall portion and the first tab at the first gap.

[0029] In some embodiments, in a projection plane perpendicular to the thickness direction of the wall portion, the second insulation member partially overlaps the first insulation portion in the projection.

[0030] In the above technical solution, by setting the projection of the second insulation member in the thickness direction of the wall portion to partially overlap the first insulation portion, the second insulation member is stacked on one side of the first insulation portion in the thickness direction of the wall portion, so that the second insulation member and the first insulation portion have an overlapping area, thereby improving the shielding effect of the second insulation member on the first gap, and further reducing the risk of short circuit or electrical breakdown of the wall portion and the first tab at the first gap.

[0031] In some embodiments, the cylindrical battery cell further comprises a first current collecting member; the first current collecting member is arranged between the first insulation portion and the first tab in the thickness direction of the wall portion, and the first current collecting member connects the electrode terminal and the first tab to electrically connect the first tab and the electrode terminal; wherein, in the thickness direction of the wall portion, the second insulation member is located between the wall portion and the first current collecting member.

[0032] In the technical scheme, the first current collecting member is arranged between the first insulating part and the first tab of the first insulating piece, and the first current collecting member is connected with the electrode terminal and the first tab, so that the insulation isolation of the first current collecting member and the wall part is realized through the first insulating piece, and meanwhile, the electrical connection difficulty between the first tab and the electrode terminal is reduced, so as to reduce the assembly difficulty of the cylindrical battery cell. In addition, the second insulating piece is arranged between the wall part and the first current collecting member in the thickness direction of the wall part, so that the second insulating piece can also play a certain blocking effect on the wall part and the first current collecting member at the first gap, which is beneficial to reduce the risk of electrical breakdown of the first current collecting member and the wall part at the first gap, so as to improve the use reliability of the cylindrical battery cell.

[0033] In some embodiments, the first current collecting member includes a current collecting body region, a terminal connecting region, and an elastic region; at least part of the current collecting body region is arranged between the first insulating part and the first tab in the thickness direction of the wall part, and the current collecting body region is electrically connected with the first tab; the terminal connecting region is connected to the electrode terminal; and the elastic region connects the current collecting body region and the terminal connecting region, and is configured to be capable of deforming.

[0034] In the technical scheme, the first current collecting member is arranged with a current collecting body region, an elastic region, and a terminal connecting region, the elastic region is connected between the current collecting body region and the terminal connecting region, the current collecting body region is electrically connected with the first tab, and the terminal connecting region is connected with the electrode terminal, so as to realize the electrical connection between the electrode terminal and the electrode assembly. The elastic region is configured to be capable of deforming when the terminal connecting region and the current collecting body region approach or move away from each other in the thickness direction of the wall part. On the one hand, the terminal connecting region can move in the thickness direction of the wall part when it is pressed, so as to absorb the assembly error between the electrode terminal and the terminal connecting region, which is beneficial to improve the assembly quality between the electrode terminal and the terminal connecting region. On the other hand, the elastic region can play a certain buffering effect between the current collecting body region and the terminal connecting region, so as to relieve the rigid pulling between the current collecting body region and the terminal connecting region, between the terminal connecting region and the electrode terminal, and between the current collecting body region and the first tab during the shaking or displacement of the electrode assembly, which is beneficial to reduce the risk of electrical connection failure between the electrode terminal and the electrode assembly, and to reduce the phenomenon of damage to the first current collecting member caused by pulling, thereby effectively improving the use stability and service life of the cylindrical battery cell.

[0035] In some embodiments, in a projection plane perpendicular to the thickness direction of the wall part, the orthographic projection of the terminal connecting region and the orthographic projection of the current collecting body region do not overlap.

[0036] In the technical solution, the terminal connecting area and the current collecting main body area are arranged in a structure in which the projections of the terminal connecting area and the current collecting main body area in the thickness direction of the wall portion do not overlap, so that when the terminal connecting area is close to or away from the current collecting main body area in the thickness direction of the wall portion, the influence of the current collecting main body area on the terminal connecting area is reduced, the movement range of the terminal connecting area relative to the current collecting main body area in the thickness direction of the wall portion is expanded, the deformation degree of the elastic area in the thickness direction of the wall portion is further improved, the effect of the elastic area on absorbing the assembly error between the electrode terminal and the terminal connecting area is further improved, the assembly quality between the electrode terminal and the terminal connecting area is further improved, and the buffering effect of the elastic area between the current collecting main body area and the terminal connecting area is further improved, so that the risk of electrical connection failure between the electrode terminal and the electrode assembly is further reduced.

[0037] In some embodiments, in a projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the elastic area and the orthographic projection of the current collecting main body area do not overlap.

[0038] In the technical solution, the terminal connecting area and the current collecting main body area are arranged in a structure in which the projections of the terminal connecting area and the current collecting main body area in the thickness direction of the wall portion do not overlap, so that when the terminal connecting area is close to or away from the current collecting main body area in the thickness direction of the wall portion, the influence of the current collecting main body area on the terminal connecting area is reduced, the movement range of the terminal connecting area relative to the current collecting main body area in the thickness direction of the wall portion is expanded, the deformation degree of the elastic area in the thickness direction of the wall portion is further improved, the effect of the elastic area on absorbing the assembly error between the electrode terminal and the terminal connecting area is further improved, the assembly quality between the electrode terminal and the terminal connecting area is further improved, and the buffering effect of the elastic area between the current collecting main body area and the terminal connecting area is further improved, so that the risk of electrical connection failure between the electrode terminal and the electrode assembly is further reduced.

[0039] In some embodiments, the electrode terminal and the terminal connecting area are arranged along the thickness direction of the wall portion, along the thickness direction of the wall portion, the terminal connecting area has a first surface facing away from the main body portion, the electrode terminal has a connecting surface facing the main body portion, and the connecting surface and the first surface are welded.

[0040] In the above technical solution, by arranging the electrode terminal and the terminal connecting area in the thickness direction of the wall portion, and by welding the first surface of the terminal connecting area, which faces away from the first surface of the main body portion, and the connecting surface of the electrode terminal, which faces the main body portion, to each other, on the one hand, the assembly difficulty between the electrode terminal and the terminal connecting area can be reduced, and the connection stability and the overcurrent stability between the terminal connecting area and the electrode terminal can be improved; on the other hand, the assembly error between the electrode terminal and the terminal connecting area can be absorbed under the action of the elastic area, so as to relieve the welding gap between the terminal connecting area and the electrode terminal, which is beneficial to reducing the risk of false welding between the terminal connecting area and the electrode terminal, so as to improve the welding quality between the terminal connecting area and the electrode terminal.

[0041] In some embodiments, along the thickness direction of the wall portion, the first insulating portion has a second surface facing the first tab, and the second surface is farther away from the main body portion than the connecting surface.

[0042] In the above technical solution, by arranging the second surface of the first insulating portion, which faces the first tab, to be closer to the main body portion than the connecting surface of the electrode terminal and the terminal connecting area in the thickness direction of the wall portion, the end of the electrode terminal, which is close to the main body portion in the thickness direction of the wall portion, is arranged to protrude from the side of the first insulating portion, which faces the first tab, so that on the one hand, the first insulating portion can reduce the blocking and interference of the electrode terminal, so as to facilitate the welding connection between the connecting surface of the electrode terminal and the first surface of the terminal connecting area; on the other hand, the electrode terminal can be pressed against the terminal connecting area in the thickness direction of the wall portion, which is beneficial to improving the abutting effect between the first surface and the connecting surface, so as to effectively improve the welding quality between the first surface and the connecting surface, and reduce the phenomenon of false welding between the terminal connecting area and the electrode terminal.

[0043] In some embodiments, along the thickness direction of the wall portion, the current collecting main body area has a third surface facing away from the main body portion, and the third surface is farther away from the main body portion than the first surface.

[0044] In the above technical solution, by arranging the third surface of the current collecting main body area, which faces away from the main body portion, to be farther away from the main body portion than the first surface of the terminal connecting area, which connects the electrode terminal, in the thickness direction of the wall portion, the electrode terminal is arranged to press the terminal connecting area in the direction of approaching the main body portion in the thickness direction of the wall portion, so that on the one hand, the assembly gap between the first surface of the terminal connecting area and the connecting surface of the electrode terminal can be reduced, which is beneficial to further improving the welding quality between the terminal connecting area and the electrode terminal; on the other hand, the connecting surface of the electrode terminal is also arranged to be closer to the main body portion than the third surface in the thickness direction of the wall portion, so that the electrode terminal and the current collecting main body area can also share part of the space in the thickness direction of the wall portion, which is beneficial to improving the utilization rate of the internal space of the cylindrical battery cell.

[0045] In some embodiments, the terminal connecting area has a fourth surface facing the main body portion in the thickness direction of the wall portion, and the current collecting main body area has a fifth surface facing the main body portion, the fifth surface being farther away from the main body portion than the fourth surface.

[0046] In the above technical solution, by further setting the fourth surface of the terminal connecting area facing the main body portion to be closer to the main body portion than the fifth surface of the current collecting main body area facing the main body portion in the thickness direction of the wall portion, the terminal connecting area is configured to be overall sunken in the thickness direction of the wall portion toward the main body portion compared to the current collecting main body area, so as to further improve the effect of the electrode terminal pressing the terminal connecting area, to reduce the assembly gap between the first surface of the terminal connecting area and the connecting surface of the electrode terminal, and to be beneficial to further improving the welding quality between the terminal connecting area and the electrode terminal.

[0047] In some embodiments, the first tab has a sixth surface facing the first current collecting member in the thickness direction of the wall portion, the current collecting main body area abuts against the sixth surface, and the sixth surface is provided with a recessed portion recessed in the thickness direction of the wall portion away from the electrode terminal; wherein at least part of the terminal connecting area is accommodated in the recessed portion in the thickness direction of the wall portion.

[0048] In the above technical solution, by setting at least part of the terminal connecting area to be accommodated in the recessed portion of the first tab in the thickness direction of the wall portion, the terminal connecting area is set in the recessed portion, and the cylindrical battery monomer adopting such a structure can achieve the first tab avoiding the terminal connecting area while also achieving the terminal connecting area and the first tab sharing part of the space in the thickness direction of the wall portion, which is beneficial to improving the internal space utilization rate of the cylindrical battery monomer.

[0049] In some embodiments, the current collecting main body area has a third surface facing away from the main body portion in the thickness direction of the wall portion, and the third surface is closer to the main body portion than the first surface.

[0050] In the technical solution, the third surface of the current collection main body region away from the main body is arranged to be closer to the main body than the first surface of the terminal connection region away from the main body in the thickness direction of the wall, so that the first surface of the terminal connection region can be closer to the connecting surface of the electrode terminal than the third surface of the current collection main body region in the thickness direction of the wall. On the one hand, the first surface of the terminal connection region can be welded to the connecting surface of the electrode terminal, and the assembly error between the electrode terminal and the terminal connection region can be better absorbed, so that the assembly quality between the electrode terminal and the terminal connection region is improved. On the other hand, the electrode terminal can be pressed against the terminal connection region in the thickness direction of the wall, so that the assembly gap between the first surface of the terminal connection region and the connecting surface of the electrode terminal is reduced, and the welding quality between the terminal connection region and the electrode terminal is improved.

[0051] In some embodiments, the first insulating portion has a second surface facing the first tab in the thickness direction of the wall, and the second surface is closer to the main body than the connecting surface.

[0052] In the technical solution, the second surface of the first insulating portion facing the first tab is arranged to be closer to the main body than the connecting surface of the electrode terminal in the thickness direction of the wall, so that one end of the electrode terminal close to the main body in the thickness direction of the wall is arranged in the through hole and does not extend to the side of the first insulating portion facing the first tab. Therefore, the space occupied by the electrode terminal on the side of the first insulating portion facing the first tab can be reduced, and the interference between the electrode terminal and other components can be reduced.

[0053] In some embodiments, at least part of the terminal connection region is arranged in the through hole in the thickness direction of the wall.

[0054] In the technical solution, at least part of the terminal connection region is arranged in the through hole in the thickness direction of the wall, so that the terminal connection region and the first insulating portion can share part of the space in the thickness direction of the wall, and the utilization rate of the internal space of the cylindrical battery cell is improved.

[0055] In some embodiments, at least part of the elastic region is deformed and bent.

[0056] In the technical solution, the elastic region is arranged to be at least partially deformed and bent, so that the elastic region is in an accumulated elastic force state after the electrode terminal presses the terminal connection region. The first surface of the terminal connection region can be pressed against the connecting surface of the electrode terminal in the thickness direction of the wall by the elastic region, so that the assembly gap between the first surface of the terminal connection region and the connecting surface of the electrode terminal is further reduced, and the welding quality between the terminal connection region and the electrode terminal is further improved.

[0057] In some embodiments, along the thickness direction of the wall portion, the first tab has a sixth surface facing the wall portion, and the current collection body region abuts against the sixth surface; wherein the sixth surface is provided with a recessed avoiding portion recessed in a direction away from the electrode terminal in the thickness direction of the wall portion, and a projection of the terminal connecting region in the thickness direction of the wall portion is located in the avoiding portion.

[0058] In the above technical solution, by providing the recessed avoiding portion recessed in a direction away from the electrode terminal on the sixth surface of the first tab facing the wall portion and abutting against the current collection body region, and setting the projection of the terminal connecting region in the thickness direction of the wall portion to be located in the avoiding portion, the terminal connecting region is set to correspond to the avoiding portion of the first tab in the thickness direction of the wall portion, so that the terminal connecting region can be inserted into the avoiding portion when it moves close to or away from the current collection body region in the thickness direction of the wall portion, thereby achieving the avoiding of the terminal connecting region by the first tab. On the one hand, it can reduce the blocking and interference of the first tab to the terminal connecting region, and is beneficial to expand the movement range of the terminal connecting region relative to the current collection body region in the thickness direction of the wall portion, thereby further improving the deformation degree of the elastic region in the thickness direction of the wall portion. On the other hand, it can alleviate the phenomenon that the terminal connecting region presses down the first tab during use or assembly, and is beneficial to reduce the damage of the first tab, and can reduce the short circuit risk caused by the reverse insertion of the first tab into the body portion.

[0059] In some embodiments, along the thickness direction of the wall portion, at least part of the projection of the elastic region is located in the avoiding portion.

[0060] In the above technical solution, by setting at least part of the projection of the elastic region in the thickness direction of the wall portion to be located in the avoiding portion, the elastic region is set to correspond to at least part of the avoiding portion of the first tab in the thickness direction of the wall portion, so that the first tab can avoid at least part of the elastic region when the elastic region deforms along the thickness direction of the wall portion. On the one hand, it can reduce the blocking and interference of the first tab to the elastic region, and is beneficial to expand the deformation range of the elastic region. On the other hand, it can alleviate the phenomenon that the elastic region presses down the first tab during use or assembly, and is beneficial to reduce the damage of the first tab, and can reduce the short circuit risk caused by the reverse insertion of the first tab into the body portion.

[0061] In some embodiments, the avoiding portion is formed with an avoiding opening on the sixth surface, the avoiding portion comprises a first peripheral surface arranged around the avoiding opening, and the first peripheral surface is arranged to be inclined from the avoiding opening to the direction close to the central axis of the cylindrical battery monomer in the thickness direction of the wall portion, wherein the orthographic projection of the elastic region and the orthographic projection of the first peripheral surface at least partially overlap in the projection plane perpendicular to the thickness direction of the wall portion.

[0062] In the above technical solution, the end of the first peripheral surface of the avoiding portion connected with the sixth surface is enclosed to form an avoiding opening, and the avoiding opening is located on the sixth surface. By arranging the first peripheral surface to be inclined from the avoiding opening to the direction close to the central axis of the cylindrical battery monomer in the thickness direction of the wall portion, the first peripheral surface is an inclined surface with a large end close to the sixth surface and a small end away from the sixth surface in the thickness direction of the wall portion. By arranging the orthographic projection of the elastic region and the orthographic projection of the first peripheral surface at least partially overlap in the projection plane perpendicular to the thickness direction of the wall portion, the first peripheral surface is arranged to correspond to the elastic region in the thickness direction of the wall portion, so that the first peripheral surface of the avoiding portion can match the deformation of the elastic region, so as to facilitate the avoiding portion to avoid the elastic region, and further expand the avoiding range of the avoiding portion to the elastic region without excessively reducing the first tab, thereby further improving the avoiding effect of the avoiding portion to the elastic region while meeting the overcurrent requirement of the first tab.

[0063] In some embodiments, the first peripheral surface is a conical surface.

[0064] In the above technical solution, by arranging the first peripheral surface as a conical surface structure, the regularity of the first peripheral surface is improved, thereby further improving the avoiding effect of the avoiding portion to the elastic region, and reducing the processing and forming difficulty of the first peripheral surface, thereby reducing the manufacturing difficulty of the cylindrical battery monomer.

[0065] In some embodiments, the electrode assembly has a central through hole penetrating through both ends of the electrode assembly in the thickness direction of the wall portion, and the avoiding portion is part of the central through hole.

[0066] In the above technical solution, the electrode assembly is provided with a central through hole penetrating through both ends of the electrode assembly in the thickness direction of the wall portion, and part of the central through hole is arranged as the avoiding portion for avoiding the terminal connecting region. The avoiding portion can avoid the terminal connecting region and cooperate with the central through hole for exhaust, thereby improving the internal exhaust smoothness of the cylindrical battery monomer, and reducing the manufacturing difficulty of the electrode assembly.

[0067] In some embodiments, the central through hole comprises a first hole section and a second hole section in communication with each other, at least part of the first hole section is located in the main body part, the second hole section is located in the first tab, and the second hole section is the avoiding part; wherein the minimum hole diameter of the second hole section is greater than the hole diameter of the first hole section.

[0068] In the above technical solution, by setting the second hole section of the central through hole located in the first tab as the avoiding part, and setting the hole diameter of the second hole section to be greater than the hole diameter of the first hole section, the effect of the second hole section as the avoiding part avoiding the terminal connection area is improved, and the phenomenon of the first hole section occupying too much space in the main body part is alleviated, thereby facilitating the improvement of the energy density of the electrode assembly.

[0069] In some embodiments, the terminal connection area is connected to the current collecting main body area through only one elastic area.

[0070] In the above technical solution, by setting the terminal connection area to be connected to the current collecting main body area through only one elastic area, the elastic area is facilitated to deform better when the terminal connection area and the current collecting main body area move closer to or away from each other in the thickness direction of the wall part, thereby facilitating the further expansion of the movement range of the terminal connection area relative to the current collecting main body area in the thickness direction of the wall part.

[0071] In some embodiments, the first current collecting member comprises a plurality of elastic areas, and the terminal connection area is connected to the current collecting main body area through the plurality of elastic areas.

[0072] In the above technical solution, by setting the terminal connection area to be connected to the current collecting main body area through a plurality of elastic areas, the connection reliability between the terminal connection area and the current collecting main body area is improved, and the flow area between the terminal connection area and the current collecting main body area is further improved.

[0073] In some embodiments, the current collecting main body area, the elastic area, and the terminal connection area are integrally formed.

[0074] In the above technical solution, by setting the current collecting main body area, the elastic area, and the terminal connection area of the first current collecting member as an integral structure, on the one hand, the connection difficulty of the elastic area connected between the current collecting main body area and the terminal connection area is reduced, thereby reducing the processing difficulty of the first current collecting member, and on the other hand, the connection reliability and stability between the current collecting main body area, the elastic area, and the terminal connection area are improved, thereby alleviating the phenomenon of fracture between the current collecting main body area and the elastic area and between the elastic area and the terminal connection area during use, and reducing the risk of connection failure between the electrode terminal and the electrode assembly.

[0075] In some embodiments, the elastic region has a Vickers hardness greater than or equal to 10 and less than or equal to 70.

[0076] In the above technical solution, by setting the Vickers hardness of the elastic region to 10 to 70, the elastic region has good structural strength and good deformation capacity, so that the elastic region can better support the terminal connecting region to alleviate the phenomenon of poor assembly caused by the terminal connecting region failing to effectively contact the electrode terminal.

[0077] In some embodiments, the material of the elastic region includes aluminum.

[0078] In the above technical solution, the elastic region made of aluminum material can have good flow guiding capacity and good deformation capacity.

[0079] In some embodiments, the elastic region is connected to the current collecting main body region and the terminal connecting region at opposite ends in the extension direction of the elastic region, and the cross-sectional area of the elastic region perpendicular to the extension direction is S, satisfying 0.2mm 2 ≤S≤8mm 2 .

[0080] In the above technical solution, the cross-sectional area of the elastic region perpendicular to the extension direction is 0.2mm 2 to 8mm 2 On the one hand, setting the cross-sectional area of the elastic region perpendicular to the extension direction to be greater than or equal to 0.2mm 2 can increase the flow area of the elastic region to improve the flow capacity of the first current collecting member, and on the other hand, setting the cross-sectional area of the elastic region perpendicular to the extension direction to be less than or equal to 8mm 2 can facilitate better deformation of the elastic region between the current collecting main body region and the terminal connecting region, which is beneficial to improving the deformation capacity of the elastic region.

[0081] In some embodiments, the cross-section is rectangular, and the length and width of the cross-section are L and W, respectively, satisfying 1mm≤L≤10mm and 0.2mm≤W≤0.8mm.

[0082] In the above technical solution, by setting the length of the cross-section of the elastic region perpendicular to the extension direction to 1mm to 10mm and the width of the cross-section of the elastic region perpendicular to the extension direction to 0.2mm to 0.8mm, the elastic region has a flat structure. This structure of the elastic region can meet the flow requirements of the elastic region, improve the deformation capacity of the elastic region, and reduce the processing difficulty of the elastic region and the space occupied by the elastic region.

[0083] In some embodiments, the current collecting body region is an annular structure surrounding the terminal connecting region, the terminal connecting region is arranged in a spaced manner with the current collecting body region, and the opposite ends of the elastic region in the extension direction thereof are connected to the outer circumferential surface of the terminal connecting region and the inner circumferential surface of the current collecting body region, respectively.

[0084] In the above technical solution, by arranging the current collecting body region as an annular structure surrounding the outer side of the terminal connecting region, and connecting the opposite ends of the elastic region in the extension direction thereof to the outer circumferential surface of the terminal connecting region and the inner circumferential surface of the current collecting body region, respectively, the elastic region is a structure connected between the terminal connecting region and the current collecting body region. The first current collecting member adopting such a structure can facilitate the deformation of the elastic region and the assembly connection of the terminal connecting region and the electrode terminal, which is conducive to reducing the connection difficulty between the terminal connecting region and the electrode terminal, and can optimize the structural layout of the current collecting body region, the elastic region and the terminal connecting region, so as to facilitate the assembly of the current collecting body region of the first current collecting member between the first insulating portion and the first tab, and is conducive to improving the structural stability of the current collecting body region of the first current collecting member arranged between the first insulating portion and the first tab.

[0085] In some embodiments, in a projection plane perpendicular to the thickness direction of the wall portion, the orthogonal projection of the elastic region extends in the radial direction of the cylindrical battery monomer.

[0086] In the above technical solution, by arranging the orthogonal projection of the elastic region in the projection plane perpendicular to the thickness direction of the wall portion to extend in the radial direction of the cylindrical battery monomer, the elastic region is a strip-shaped structure arranged between the current collecting body region and the terminal connecting region in the radial direction of the cylindrical battery monomer, which can facilitate the deformation of the elastic region when the current collecting body region and the terminal connecting region approach or move away from each other in the thickness direction of the wall portion, is conducive to improving the buffering effect of the elastic region between the current collecting body region and the terminal connecting region, and can improve the effect of the elastic region absorbing the assembly error between the terminal connecting region and the electrode terminal, and on the other hand, can improve the regularity of the shape of the first current collecting member, which is conducive to reducing the processing difficulty of the first current collecting member.

[0087] In some embodiments, the opposite ends of the elastic region in the extension direction thereof are connected to the current collecting body region and the terminal connecting region, respectively, and the size of the elastic region in the extension direction thereof is D, the radius of the current collecting body region is R, and 0.4R≤D≤0.95R is satisfied.

[0088] In the technical solution, the size D of the elastic region in the extension direction is greater than or equal to 0.4 times the radius R of the current collecting body region, so that the elastic region has sufficient length to deform, which is beneficial to improve the ability of the elastic region to deform when the current collecting body region and the terminal connecting region approach or move away from each other along the thickness direction of the wall portion. In addition, the size D of the elastic region in the extension direction is less than or equal to 0.95 times the radius R of the current collecting body region, so as to alleviate the phenomenon that the terminal connecting region is too small due to the excessive space occupied by the elastic region, and improve the connection area between the terminal connecting region and the electrode terminal, thereby improving the overcurrent area and the connection reliability between the terminal connecting region and the electrode terminal.

[0089] In some embodiments, 8mm≤D≤25mm.

[0090] In the technical solution, the size D of the elastic region in the extension direction is greater than or equal to 0.4 times the radius R of the current collecting body region, so that the elastic region has sufficient length to deform, which is beneficial to improve the ability of the elastic region to deform when the current collecting body region and the terminal connecting region approach or move away from each other along the thickness direction of the wall portion. In addition, the size D of the elastic region in the extension direction is less than or equal to 0.95 times the radius R of the current collecting body region, so as to alleviate the phenomenon that the terminal connecting region is too small due to the excessive space occupied by the elastic region, and improve the connection area between the terminal connecting region and the electrode terminal, thereby improving the overcurrent area and the connection reliability between the terminal connecting region and the electrode terminal.

[0091] In some embodiments, the first current collecting member further includes a base region, the elastic region is connected to the current collecting body region through the base region, and a width of a projection of the base region on a circumferential direction of the current collecting body region is greater than a width of a projection of the elastic region on the circumferential direction of the current collecting body region.

[0092] In the technical solution, the first current collecting member further includes a base region, the elastic region is connected to the current collecting body region through the base region, and a width of a projection of the base region on a circumferential direction of the current collecting body region is greater than a width of a projection of the elastic region on the circumferential direction of the current collecting body region.

[0093] In some embodiments, the base region has opposite first and second ends, the first end is connected to the elastic region, and the second end is connected to the current collecting body region; and a width of a projection of the base region on a circumferential direction of the current collecting body region gradually increases from the first end to the second end in a projection plane perpendicular to the thickness direction of the wall portion.

[0094] In the above technical solution, by setting the base area to gradually increase in width from the first end connected to the elastic area to the second end connected to the current collecting body area in the circumferential direction of the current collecting body area, on the one hand, the width of the end where the base area is connected to the elastic area can be reduced, which is conducive to reducing the width difference at the connection position of the base area and the elastic area, thereby reducing the connection difficulty and forming difficulty of the base area and the elastic area, and achieving smoother transition at the connection position of the base area and the elastic area. On the other hand, increasing the width of the second end where the base area is connected to the current collecting body area can expand the angle of the position where the inner circumferential surface of the base area and the current collecting body area are connected to each other, thereby relieving the stress concentration phenomenon at the connection position of the base area and the current collecting body area, which is conducive to reducing the risk of damage or cracking at the connection position of the base area and the current collecting body area, thereby improving the use reliability and service life of the first current collecting member.

[0095] In some embodiments, the first current collecting member further comprises a tab connecting area; the tab connecting area is connected to the inner circumferential surface of the current collecting body area, and the tab connecting area is connected to the first tab to electrically connect the current collecting body area and the first tab.

[0096] In the above technical solution, the first current collecting member is further provided with a tab connecting area for connecting with the first tab, and the tab connecting area is connected to the inner circumferential surface of the current collecting body area. On the one hand, the current collecting body area is connected to the first tab through the tab connecting area, which is conducive to reducing the connection difficulty between the first current collecting member and the first tab, and can increase the connection area between the first current collecting member and the first tab. On the other hand, the structure layout between the tab connecting area and the current collecting body area can be optimized to facilitate the assembly of the current collecting body area of the first current collecting member between the first insulating portion and the first tab, thereby improving the structural stability of the current collecting body area of the first current collecting member arranged between the first insulating portion and the first tab.

[0097] In some embodiments, the tab connecting area extends in the radial direction of the cylindrical battery cell.

[0098] In the above technical solution, by setting the tab connecting area to extend in the radial direction of the cylindrical battery cell, the connection area between the tab connecting area and the first tab can be increased to improve the connection stability between the tab connecting area and the first tab. Moreover, the first tab can be connected to the tab connecting area at multiple positions in the radial direction of the cylindrical battery cell, which facilitates the connection of the multiple-turn structure of the first tab of the electrode assembly in the cylindrical structure to the tab connecting area. This is conducive to increasing the flow area between the first tab and the tab connecting area, and improving the flow balance between the electrode assembly and the tab connecting area, thereby reducing the risk of local lithium precipitation of the electrode assembly during use.

[0099] In some embodiments, in a projection plane perpendicular to the thickness direction of the wall portion, the front projection of the terminal connecting area and the front projection of the elastic area are both not overlapped with the front projection of the tab connecting area.

[0100] In the above technical solution, by setting the projections of the terminal connecting area and the elastic area in the thickness direction of the wall portion to be not overlapped with the projection of the tab connecting area in the thickness direction of the wall portion, the terminal connecting area can reduce the blocking and interference of the tab connecting area to the terminal connecting area and the elastic area when moving close to or away from the current collecting main body area in the thickness direction of the wall portion, which is beneficial to expand the moving range of the terminal connecting area relative to the current collecting main body area in the thickness direction of the wall portion, and can improve the deformation degree of the elastic area in the thickness direction of the wall portion, thereby further improving the effect of the elastic area in reducing the assembly error between the electrode terminal and the terminal connecting area, to further improve the assembly quality between the electrode terminal and the terminal connecting area, and further improve the buffering effect of the elastic area between the current collecting body area and the terminal connecting area, to further reduce the risk of electrical connection failure between the electrode terminal and the electrode assembly.

[0101] In some embodiments, the first current collecting member includes a plurality of tab connecting areas, and the plurality of tab connecting areas are arranged at intervals along the circumference of the current collecting main body area.

[0102] In the above technical solution, by connecting a plurality of tab connecting areas on the current collecting main body area, and arranging the plurality of tab connecting areas at intervals along the circumference of the current collecting main body area, on the one hand, the connection area between the first current collecting member and the first tab can be further improved, to improve the flow area between the first current collecting member and the first tab, and on the other hand, the first tab can be connected to the tab connecting area at multiple positions along the circumference of the main body area, which is beneficial to improve the flow balance between the electrode assembly and the first current collecting member, to reduce the risk of local lithium precipitation of the electrode assembly during use.

[0103] In some embodiments, the terminal connecting area and the electrode terminal are welded at one end of the main body portion in the thickness direction of the wall portion.

[0104] In the technical scheme, the terminal connecting area is connected to the electrode terminal at one end of the wall part in the thickness direction of the wall part, and the terminal connecting area is connected to the end surface of the electrode terminal at one end of the wall part in the thickness direction of the wall part. On the one hand, the connection stability and the overcurrent stability between the terminal connecting area and the electrode terminal are improved. On the other hand, the assembly error between the electrode terminal and the terminal connecting area is absorbed under the action of the elastic area, so that the welding gap between the terminal connecting area and the electrode terminal is relieved, the risk of false welding between the terminal connecting area and the electrode terminal is reduced, and the welding quality between the terminal connecting area and the electrode terminal is improved.

[0105] In some embodiments, the electrode assembly has a center through hole penetrating through both ends of the electrode assembly in the thickness direction of the wall part; wherein the terminal connecting area is connected to the electrode terminal and forms a connecting part, and the projection of the connecting part in the thickness direction of the wall part is located in the center through hole.

[0106] In the technical scheme, the terminal connecting area and the electrode terminal are connected to each other to form a connecting part, and the projection of the connecting part in the thickness direction of the wall part is located in the center through hole. When the terminal connecting area and the electrode terminal are connected by welding, the welding assembly can be performed from the side of the terminal connecting area away from the electrode terminal through the center through hole, which is beneficial to reduce the power required for welding the terminal connecting area and the electrode terminal, reduce the welding difficulty between the terminal connecting area and the electrode terminal, improve the welding quality between the terminal connecting area and the electrode terminal, and improve the connection reliability between the terminal connecting area and the electrode terminal.

[0107] In some embodiments, the electrode terminal includes a terminal body and a protruding part; the terminal body is arranged in the mounting hole and connected to the wall part, and the terminal body extends into the through hole in the thickness direction of the wall part; the sealing member is arranged between the terminal body and the wall part, and the terminal body includes the first limiting part; the protruding part is connected to the terminal body, and the protruding part protrudes from one end of the terminal body facing the main body part in the thickness direction of the wall part; and one end of the protruding part close to the main body part is connected to the terminal connecting area.

[0108] In the technical scheme, the electrode terminal comprises a terminal body connected to the wall portion and a protruding portion protruding from the terminal body and located at one end of the terminal body close to the main body portion, the terminal body is inserted into the through hole along the thickness direction of the wall portion, and the protruding portion is connected to the terminal connecting area of the first current collecting member. The electrode terminal with the structure can reduce the connection difficulty between the electrode terminal and the terminal connecting area, reduce the interference between the terminal connecting area and the terminal body, facilitate the electrode terminal to press the terminal connecting area along the thickness direction of the wall portion through the protruding portion, and absorb the assembly error between the electrode terminal and the terminal connecting area, thereby improving the assembly quality between the terminal connecting area and the electrode terminal.

[0109] In some embodiments, the protruding portion protrudes from the surface of the first insulating portion facing the first current collecting member along the thickness direction of the wall portion.

[0110] In the technical scheme, the protruding portion protrudes from the surface of the first insulating portion facing the first current collecting member along the thickness direction of the wall portion. The structure can reduce the interference of the first insulating portion to the protruding portion, facilitate the mutual connection between the protruding portion and the terminal connecting area, and reduce the connection difficulty between the protruding portion and the terminal connecting area.

[0111] In some embodiments, the first current collecting member is formed with a hollow area, the wall portion has an exposed area corresponding to the first gap along the thickness direction of the wall portion, and a part of the projection of the exposed area is located in the hollow area.

[0112] In the technical scheme, the first current collecting member is formed with a hollow area, and the exposed area of the wall portion corresponding to the first gap is arranged such that a part of the projection of the exposed area along the thickness direction of the wall portion is located in the hollow area. This structure can reduce the area of the first current collecting member corresponding to the first gap along the thickness direction of the wall portion, thereby reducing the risk of short circuit or electrical breakdown of the wall portion and the first current collecting member at the first gap.

[0113] In some embodiments, the orthographic projection of the exposed area does not overlap with the orthographic projection of the first tab in a projection plane perpendicular to the thickness direction of the wall portion.

[0114] In the technical scheme, the orthographic projection of the exposed area does not overlap with the orthographic projection of the first tab in a projection plane perpendicular to the thickness direction of the wall portion. This structure can prevent the orthographic projection of the first tab along the thickness direction of the wall portion from falling into the first gap, thereby reducing the risk of short circuit between the first tab and the wall portion after the first tab is inserted into the first gap, and reducing the risk of electrical breakdown of the first tab and the wall portion at the first gap.

[0115] In some embodiments, the electrode terminal comprises a terminal body arranged in the mounting hole of the wall portion, and the terminal body is connected to the wall portion, the terminal body comprises the first limiting portion; wherein the terminal body extends into the through hole along the thickness direction of the wall portion, and the sealing member further comprises a second sealing portion, the second sealing portion is located between the terminal body and the hole wall surface of the mounting hole to seal the gap between the terminal body and the hole wall surface of the mounting hole.

[0116] In the above technical solution, by arranging the terminal body of the electrode terminal in the mounting hole of the wall portion, and arranging the second sealing portion of the sealing member between the terminal body and the hole wall surface of the mounting hole, the sealing member can seal the gap between the terminal body and the hole wall surface of the mounting hole, thereby further improving the effect of the sealing member sealing the wall portion and the electrode terminal, and improving the stability and firmness of the sealing member installed between the wall portion and the electrode terminal, which is beneficial to reduce the risk of the sealing member falling off during use.

[0117] In some embodiments, the terminal body further comprises a second limiting portion located on the side of the wall portion away from the interior of the shell, the first limiting portion and the second limiting portion are arranged in the thickness direction of the wall portion, and at least part of the wall portion is located between the first limiting portion and the second limiting portion; wherein the sealing member further comprises a third sealing portion, the third sealing portion is located between the wall portion and the second limiting portion in the thickness direction of the wall portion to seal the gap between the wall portion and the second limiting portion.

[0118] In the above technical solution, by arranging the first limiting portion and the second limiting portion on the terminal body and spaced apart in the thickness direction of the wall portion, and at least part of the wall portion is located between the first limiting portion and the second limiting portion, the first limiting portion and the second limiting portion of the terminal body are structures located on both sides of the wall portion in the thickness direction of the wall portion, so that the first limiting portion and the second limiting portion can cooperate to clamp the wall portion, thereby realizing the installation of the terminal body of the electrode terminal on the wall portion, which is simple in structure and easy to realize and assemble. In addition, the sealing member further comprises a third sealing portion located between the second limiting portion and the wall portion, so that the sealing member can also seal the gap between the second limiting portion and the wall portion, which is beneficial to further improve the effect of the sealing member sealing the wall portion and the electrode terminal, and improve the stability and firmness of the sealing member installed between the wall portion and the electrode terminal, which is beneficial to reduce the risk of the sealing member falling off during use.

[0119] In some embodiments, the first insulating portion is adhesively connected to the wall portion.

[0120] In the technical solution, the first insulation part is connected to the wall part by bonding, which can reduce the assembly difficulty between the first insulation part and the wall part, thereby reducing the assembly difficulty of the cylindrical battery cell, and improve the assembly stability of the first insulation part in the shell, thereby reducing the risk of movement or shaking of the first insulation part during use.

[0121] In some embodiments, the first insulation part further comprises a second insulation part, the second insulation part surrounds the first insulation part, and the first insulation part and the second insulation part jointly define a containing space, wherein the first tab is contained in the containing space along the thickness direction of the wall part.

[0122] In the technical solution, the first insulation part further comprises a second insulation part surrounding the first insulation part, and the first insulation part and the second insulation part jointly define a containing space containing the first tab. The cylindrical battery cell with this structure can facilitate the assembly of the first insulation part, and the assembly between the first insulation part and the electrode assembly can be completed by inserting the end of the electrode assembly provided with the first tab into the containing space of the first insulation part, thereby reducing the assembly difficulty between the first insulation part and the electrode assembly. In addition, the second insulation part can further separate the first tab from the shell, thereby improving the insulation and isolation effect of the first insulation part on the first tab and the shell, reducing the risk of short circuit of the cylindrical battery cell, and improving the use reliability of the cylindrical battery cell.

[0123] In some embodiments, the main part is provided with the end of the first tab contained in the containing space along the thickness direction of the wall part.

[0124] In the technical solution, the end of the first tab of the main part is inserted into the containing space in the thickness direction of the wall part, so that the first tab is entirely contained in the containing space, thereby further improving the insulation and isolation effect of the first insulation part on the first tab and the shell, and further reducing the risk of short circuit of the cylindrical battery cell during use.

[0125] In some embodiments, the electrode assembly further comprises a second tab protruding from an end of the main body portion away from the wall portion in the thickness direction of the wall portion; the cylindrical battery cell further comprises a second current collecting member disposed at an end of the electrode assembly away from the wall portion in the thickness direction of the wall portion and connected to the second tab; wherein the housing further comprises a side wall surrounding the wall portion, and a protrusion protruding from an inner wall surface of the side wall, the main body portion being located between the protrusion and the wall portion in the thickness direction of the wall portion, the protrusion being connected to the second current collecting member to electrically connect the electrode assembly and the side wall.

[0126] In the above technical solution, the electrode assembly is further provided with a second tab, and the cylindrical battery cell is further provided with a second current collecting member connected to the second tab. By protruding a protrusion from the side wall of the housing, the protrusion is located between the main body portion and the wall portion in the thickness direction of the wall portion, and the second current collecting member is connected to the protrusion to electrically connect the side wall of the housing and the electrode assembly, thereby enabling the input or output of electrical energy of the cylindrical battery cell. The cylindrical battery cell with such a structure can reduce the difficulty of electrical connection between the second current collecting member and the side wall, thereby reducing the assembly difficulty of the cylindrical battery cell. In addition, the protrusion in the thickness direction of the wall portion can also limit the main body portion of the electrode assembly to some extent, which is beneficial to reducing the movement of the electrode assembly during use.

[0127] In some embodiments, the second current collecting member comprises a first connection region, a second connection region, and a third connection region; the first connection region is located at an end of the electrode assembly away from the wall portion in the thickness direction of the wall portion and is connected to the second tab; the second connection region is connected to the protrusion; the third connection region connects the first connection region and the second connection region, and the third connection region is configured to be deformable.

[0128] In the technical scheme, the second current collecting component is provided with the first connecting area, the second connecting area and the third connecting area, the first connecting area and the second connecting area are connected with the second tab and the protrusion respectively, and the third connecting area is connected between the first connecting area and the second connecting area, so as to realize the electrical connection between the second tab and the side wall through the second current collecting component. In the technical scheme, the third connecting area is arranged in a structure capable of deforming when the first connecting area and the second connecting area are close to or away from each other along the thickness direction of the wall portion, so that the third connecting area can play a certain buffering role between the first connecting area and the second connecting area, thereby relieving the rigid pulling between the first connecting area and the second connecting area, between the first connecting area and the second tab, and between the second connecting area and the protrusion during the shaking or displacement of the electrode assembly, which is conducive to further reducing the risk of connection failure between the first connecting area and the second tab and between the second connecting area and the protrusion, and reducing the damage of the second current collecting component caused by pulling.

[0129] In some embodiments, the third connecting area is bent to form a plurality of bending segments, the plurality of bending segments are connected in sequence, and the bending segments at both ends of the plurality of bending segments are connected with the first connecting area and the second connecting area respectively.

[0130] In the technical scheme, the third connecting area is arranged in a structure of a plurality of bending segments connected in sequence, and the bending segments at both ends of the plurality of bending segments are connected with the first connecting area and the second connecting area respectively, so as to increase the deformation ability of the third connecting area when the first connecting area and the second connecting area are close to or away from each other along the thickness direction of the wall portion, so as to further improve the buffering effect of the third connecting area between the first connecting area and the second connecting area, thereby further reducing the rigid pulling between the first connecting area and the second connecting area, between the first connecting area and the second tab, and between the second connecting area and the protrusion.

[0131] In some embodiments, the second current collecting component includes a second connecting area connected with the protrusion, and the second connecting area is located on the side of the protrusion away from the wall portion along the thickness direction of the wall portion.

[0132] In the technical scheme, the second connecting area of the second current collecting component and the main body portion of the electrode assembly are located on both sides of the protrusion along the thickness direction of the wall portion, so that the cylindrical battery monomer with the structure can reduce the interference of the main body portion on the connection position of the second connecting area and the protrusion, and can reduce the blocking of the main body portion on the second connecting area, which is conducive to reducing the connection difficulty between the second connecting area and the protrusion, so as to reduce the assembly difficulty of the cylindrical battery monomer.

[0133] In some embodiments, the second current collecting member is welded to the protrusion.

[0134] In the above technical solution, by setting the second current collecting member and the protrusion in a welded connection structure, the connection stability and reliability between the second current collecting member and the protrusion can be improved, so as to reduce the risk of connection failure between the second current collecting member and the protrusion during use.

[0135] In some embodiments, the protrusion is an annular structure extending along the circumference of the side wall.

[0136] In the above technical solution, by setting the protrusion as an annular structure extending along the circumference of the side wall, on the one hand, the limiting or positioning effect of the protrusion on the main body of the electrode assembly can be further improved, and on the other hand, the protrusion can be connected to the second current collecting member at any position along the circumference of the side wall, so as to facilitate the assembly and connection between the second current collecting member and the protrusion. After the second current collecting member is assembled into the shell, it is not necessary to rotate and adjust the position and orientation of the second current collecting member, and the assembly and connection between the second current collecting member and the protrusion can be realized, which can further reduce the connection difficulty between the second current collecting member and the protrusion, thereby effectively improving the assembly efficiency of the cylindrical battery cell.

[0137] In some embodiments, a groove is formed on the side of the side wall away from the electrode assembly and corresponding to the position of the protrusion.

[0138] In the above technical solution, by setting a groove on the side of the side wall away from the electrode assembly and corresponding to the position of the protrusion, the protrusion formed on the side of the side wall facing the electrode assembly is a structure that can be formed by stamping processing. By forming the protrusion on the side of the side wall facing the electrode assembly and forming the groove on the other side and corresponding to the position of the protrusion, the cylindrical battery cell with this structure can reduce the difficulty of forming the protrusion on the side of the side wall facing the electrode assembly, thereby improving the production efficiency of the cylindrical battery cell. On the other hand, the interior of the protrusion can be hollow, thereby reducing the difficulty of assembling and connecting the second current collecting member and the protrusion, and enabling the protrusion to have the ability of elastic deformation, which can further alleviate the rigid pulling between the second current collecting member and the protrusion, thereby reducing the risk of connection failure between the second current collecting member and the protrusion.

[0139] In some embodiments, the shell includes a shell body and an end cover; the shell body includes an integrally formed side wall and a bottom wall, the side wall is arranged around the bottom wall, one end of the side wall is connected to the bottom wall along the thickness direction of the wall, and the other end of the side wall is surrounded to form an opening. The side wall and the bottom wall jointly define a containing cavity, and the electrode assembly is contained in the containing cavity; the end cover seals the opening; wherein the bottom wall is the wall.

[0140] In the technical scheme, the wall part of the shell is arranged as a bottom wall opposite to the end cover of the shell body, so that the wall part provided with the electrode terminal can be away from the end cover, thereby the phenomenon that stress generated by pulling or twisting of other components on the electrode terminal is transmitted to the connection position of the end cover and the shell body can be relieved, and the risk of connection failure of the end cover and the shell body can be reduced, so as to improve the use stability and reliability of the cylindrical battery cell.

[0141] In some embodiments, the shell comprises a shell body and an end cover; an accommodating cavity with an opening is formed in the interior of the shell body, and the electrode assembly is accommodated in the accommodating cavity; the end cover closes the opening; wherein the end cover is the wall part.

[0142] In the technical scheme, the wall part of the shell is arranged as an end cover used for closing the opening of the shell body, so that the cylindrical battery cell with this structure facilitates the assembly of the electrode terminal on the end cover, and the difficulty of assembling the first insulating piece and the second insulating piece between the wall part and the electrode assembly can be reduced, thereby the manufacturing difficulty of the cylindrical battery cell can be reduced, and the production efficiency of the cylindrical battery cell can be improved.

[0143] In a second aspect, the embodiments of the present application further provide a battery device comprising the cylindrical battery cell.

[0144] In a third aspect, the embodiments of the present application further provide an electric device comprising the cylindrical battery cell, and the cylindrical battery cell is used for providing electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0145] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0146] Figure 1 The structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0147] Figure 2 The structural explosion diagram of a battery device is provided for some embodiments of the present application;

[0148] Figure 3 The structural schematic diagram of a cylindrical battery cell is provided for some embodiments of the present application;

[0149] Figure 4 The structural explosion diagram of a cylindrical battery cell is provided for some embodiments of the present application;

[0150] Figure 5A cross-sectional view of a cylindrical battery cell provided for some embodiments of the present application;

[0151] Figure 6 A cross-sectional view of a cylindrical battery cell provided for some embodiments of the present application; Figure 5 A partial enlarged view of A of the cylindrical battery cell shown in FIG. 1;

[0152] Figure 7 A cross-sectional view of a first insulating member of a cylindrical battery cell provided for some embodiments of the present application;

[0153] Figure 8 A cross-sectional view of an electrode terminal provided for some embodiments of the present application;

[0154] Figure 9 A cross-sectional view of a sealing member provided for some embodiments of the present application;

[0155] Figure 10 A cross-sectional view of a cylindrical battery cell provided for some embodiments of the present application;

[0156] Figure 11 A cross-sectional view of a cylindrical battery cell provided for some embodiments of the present application; Figure 10 A partial enlarged view of B of the cylindrical battery cell shown in FIG. 2;

[0157] Figure 12 A structural schematic view of a first current collecting member provided for some embodiments of the present application;

[0158] Figure 13 A partial cross-sectional view of an electrode assembly of a cylindrical battery cell provided for some embodiments of the present application;

[0159] Figure 14 A cross-sectional view of a first current collecting member provided for some embodiments of the present application, in which the elastic region extends perpendicularly to the extending direction thereof;

[0160] Figure 15 A front view of a first current collecting member provided for some embodiments of the present application, in which the thickness direction of the wall portion is shown;

[0161] Figure 16 A cross-sectional view of a cylindrical battery cell provided for some embodiments of the present application;

[0162] Figure 17 A cross-sectional view of a cylindrical battery cell provided for some embodiments of the present application; Figure 16 A partial enlarged view of C of the cylindrical battery cell shown in FIG. 3;

[0163] Figure 18 A structural schematic view of a second current collecting member provided for some embodiments of the present application.

[0164] Icon: 1000-vehicle; 100-battery device; 10-box body; 11-first box body; 12-second box body; 20-cylindrical battery cell; 21-outer shell; 211-wall part; 2111-mounting hole; 2112-exposed area; 212-housing; 2121-opening; 2122-bottom wall; 2123-side wall; 2123a-protrusion; 2123b-groove; 213-end cover; 22-electrode terminal; 221-terminal body; 2211-first limiting part; 2212-second limiting part; 222-protruding part; 223-connection surface; 23-electrode assembly; 231-main body part; 232-first tab; 2321-sixth surface; 2322-avoidance part; 2322a-avoidance opening; 2322b-first peripheral surface; 2323-avoidance hole; 233-second tab; 234-central through hole; 2341-first hole section; 2342-second hole section; 24-sealing member; 241-first sealing part; 242-second sealing part; 243-third sealing part; 25-first insulating member; 251-first insulating part; 2511-through hole; 2512-second surface; 252-second insulating part; 253- accommodating space; 26-second insulating member; 27-first gap; 28-first current collecting member; 281-current collecting main body area; 2811-third surface; 2812-fifth surface; 282-terminal connection area; 2821-first surface; 2822-fourth surface; 283-elastic area; 284-tab connection area; 285-base area; 2851-first end; 2852-second end; 286-hollowed area; 29-second current collecting member; 291-first connection area; 292-second connection area; 293-third connection area; 2931-bent section; 30-connection part; 200-controller; 300-motor; X-thickness direction of wall part. DETAILED DESCRIPTION

[0165] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0166] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, all terms used in disclosing the application, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The articles 'a', 'an', and 'the' each followed by'some or more' or 'one or more' of an element are intended to include one or more articles of the described element and do not exclude other additional elements. The terms "comprises", "comprising", "includes", "including", "has", "having" and the like are inclusive and are used as equivalents of the term "consisting of".

[0167] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0168] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection", "attaching" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0169] The term "and / or" in the application is only a description of the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the application generally represents that the front and rear associated objects have an "or" relationship.

[0170] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the application.

[0171] "Multiple" appearing in the application means two or more (including two).

[0172] In the embodiments of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to use.

[0173] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0174] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through.

[0175] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0176] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0177] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0178] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials can also be used. These positive electrode active materials can be used alone or in combination with two or more. Among them, examples of lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP for short)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3O2(also can be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2(also can be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2(also can be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2(also can be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof.

[0179] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is used as the positive electrode, the surface of the foam metal can not be provided with a positive electrode active material, or of course can be provided with a positive electrode active material. As an example, the foam metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0180] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0181] As an example, the negative electrode current collector can employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, silver surface treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, nickel, or titanium, or the like can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0182] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0183] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two surfaces of the negative current collector.

[0184] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative active material can also be used. These negative active materials can be used alone or in combination of two or more.

[0185] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0186] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0187] In some embodiments, the separator is a separator film. The separator film can be of various types, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0188] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0189] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive and negative electrodes.

[0190] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0191] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluorophosphoric oxalate, and lithium tetrafluorophosphoric oxalate.

[0192] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from ether solvents. The ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0193] In some embodiments, the gel-state electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0194] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0195] As an example, the polymer solid-state electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, or the like.

[0196] As an example, the inorganic solid-state electrolyte can include one or more of oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), and halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0197] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0198] In some embodiments, the electrode assembly has a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0199] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, or the like.

[0200] In some embodiments, the electrode assembly is provided with a positive electrode tab and a negative electrode tab.

[0201] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, or the like.

[0202] As an example, the battery cell can be cylindrical, i.e., a cylindrical battery cell.

[0203] The battery apparatus mentioned in embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0204] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0205] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0206] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0207] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0208] As an example, the box can include a first box body and a second box body. The first box body and the second box body are fastened so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate.

[0209] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0210] As an example, the box can be part of the chassis structure of a vehicle. For example, the top cover of the box can be at least part of the floor of the vehicle, or the frame of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0211] In some embodiments, the battery apparatus refers to an energy storage device, and the energy storage device includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0212] Battery devices have the advantages of high energy density, small environmental pollution, large power density, long service life, wide application range, small self-discharge coefficient, etc., and are an important part of the development of new energy today. The development of battery technology needs to consider many design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, and the safety of the battery device also needs to be considered.

[0213] For a general cylindrical battery cell, the cylindrical battery cell generally includes a shell and an electrode assembly contained in the shell, and an electrode terminal is arranged on the wall portion of the shell. Correspondingly, the electrode assembly is formed with a tab at one end close to the wall portion, and the electrode terminal and the tab are electrically connected to realize the input or output of the electric energy of the cylindrical battery cell. In the related art, a mounting hole is arranged on the wall portion for assembling the electrode terminal, so that one end of the electrode terminal can extend into the shell and the other end can extend out of the shell, so as to realize the input or output of the electric energy of the cylindrical battery cell by the electrode terminal. In order to solve the short circuit problem between the electrode terminal and the wall portion and the leakage risk between the electrode terminal and the wall portion, an insulating sealing member is usually arranged between the electrode terminal and the hole wall surface of the mounting hole, so that the sealing member can seal the gap between the electrode terminal and the hole wall surface of the mounting hole, and also insulate and isolate the electrode terminal and the wall portion. Correspondingly, in order to reduce the short circuit risk between the tab and the wall portion, a first insulating member is usually arranged on the side of the wall portion facing the electrode assembly, so that the first insulating member can insulate and isolate the tab and the wall portion. However, in order to alleviate the interference problem between the first insulating member and the sealing member and the electrode terminal, a through hole is usually formed in the first insulating member for inserting the electrode terminal and the sealing member, and the hole wall surface of the through hole and the sealing member are arranged in the radial direction of the cylindrical battery cell. In order to reduce the assembly difficulty and the assembly interference between the sealing member and the first insulating member, the through hole is arranged in the first insulating member. However, the cylindrical battery cell with such a structure is prone to the phenomenon that the tab is inserted into the first gap and overlaps with the shell or the tab and the shell are electrically broken at the first gap during use, thereby causing the cylindrical battery cell to be still prone to the risk of short circuit between the tab and the shell during use, and thus the use reliability of the cylindrical battery cell is not improved.

[0214] In view of the above, in order to solve the problem of low use reliability of the cylindrical battery cell, the embodiment of the present application provides a cylindrical battery cell, which comprises a shell, an electrode terminal, an electrode assembly, a sealing element, a first insulating element and a second insulating element. The shell has a wall portion, the thickness direction of the wall portion is the axial direction of the cylindrical battery cell, the wall portion is provided with a mounting hole, the mounting hole penetrates the wall portion along the thickness direction of the wall portion. The electrode terminal is arranged in the mounting hole, and the electrode terminal comprises a first limiting portion located on the side of the wall portion facing the inside of the shell. The electrode assembly is accommodated in the shell, and the electrode assembly comprises a main body portion and a first tab, the first tab protrudes from one end of the main body portion facing the wall portion and is electrically connected with the electrode terminal. The sealing element is made of insulating material, and the sealing element comprises a first sealing portion, the first sealing portion is located between the wall portion and the first limiting portion in the thickness direction of the wall portion, and the first sealing portion exceeds the first limiting portion in the radial direction of the cylindrical battery cell away from the central axis of the cylindrical battery cell. The first insulating element comprises a first insulating portion arranged between the wall portion and the first tab in the thickness direction of the wall portion, the first insulating portion is provided with a through hole, the through hole penetrates the first insulating portion along the thickness direction of the wall portion, at least part of the first sealing portion and the first limiting portion is located in the through hole, and a first gap is formed between the first sealing portion and the hole wall surface of the through hole in the radial direction of the cylindrical battery cell. The second insulating element is located between the wall portion and the first tab in the thickness direction of the wall portion, and the projection of the second insulating element in the thickness direction of the wall portion covers at least part of the first gap.

[0215] In the cylindrical battery cell with the above structure, the sealing element comprises a first sealing portion arranged between the first limiting portion of the electrode terminal and the wall portion, so that the sealing element can seal the gap between the electrode terminal and the wall portion, to alleviate the risk of leakage from the mounting hole during use of the cylindrical battery cell, and the first sealing portion of the sealing element is arranged to be located in the through hole and exceeds the first limiting portion in the radial direction of the cylindrical battery cell away from the central axis of the cylindrical battery cell, so that a first gap is formed between the first sealing portion and the hole wall surface of the through hole, to facilitate the assembly of the first sealing portion of the sealing element in the through hole, and to reduce the assembly interference between the first sealing portion of the sealing element and the first insulating portion of the first insulating element. By arranging the second insulating element between the wall portion and the first tab, and the projection of the second insulating element in the thickness direction of the wall portion covers at least part of the first gap between the first sealing portion and the first insulating portion, so that the second insulating element can shield the first gap, thereby increasing the creepage distance of the wall portion and the first tab at the first gap, and the second insulating element can play a certain blocking role between the first tab and the wall portion, thereby effectively alleviating the phenomenon of the first tab inserted in the first gap overlapping with the wall portion or the first tab and the wall portion being electrically broken down at the first gap, and reducing the risk of internal short circuit of the cylindrical battery cell during use, to improve the use reliability of the cylindrical battery cell.

[0216] The cylindrical battery cell disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the cylindrical battery cell, the battery device and the like disclosed in the present application, so that the problem of internal short circuit of the cylindrical battery cell can be alleviated, and the use reliability of the cylindrical battery cell can be improved.

[0217] The embodiments of the present application provide an electric device using the cylindrical battery cell or the battery device as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy and the like. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft and the like.

[0218] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0219] Please refer to Figure 1 , Figure 1 The structural schematic diagram of the vehicle 1000 provided in some embodiments of the present application is shown. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile and the like. The vehicle 1000 is internally provided with the battery device 100, which can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000, for example, the battery device 100 can be used as an operating power supply or a use power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0220] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply or a use power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0221] Please refer to Figure 2 and Figure 3 , Figure 2 The structural explosion diagram of the battery device 100 provided in some embodiments of the present application is shown. Figure 3 The structural schematic diagram of the cylindrical battery cell 20 provided in some embodiments of the present application is shown. The battery device 100 includes a box body 10 and the cylindrical battery cell 20, and the cylindrical battery cell 20 is arranged in the box body 10.

[0222] The box 10 is configured to provide an assembly space for the cylindrical battery cell 20, and the box 10 can have various structures. In some embodiments, the box 10 can include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 are overlapped with each other, and the first box body 11 and the second box body 12 together define an assembly space for accommodating the cylindrical battery cell 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-shaped structure, which is overlapped with the open end of the second box body 12 to define the assembly space together with the second box body 12. Alternatively, the first box body 11 and the second box body 12 can both be hollow structures with one side open, and the open side of the first box body 11 is overlapped with the open side of the second box body 12.

[0223] Of course, the box 10 formed by the first box body 11 and the second box body 12 can have various shapes, such as a cylinder, a cuboid, a square, etc. For example, in some embodiments, the box 10 has a cuboid shape. Figure 2

[0224] In the battery device 100, the cylindrical battery cell 20 arranged in the box 10 can be one or multiple. When the cylindrical battery cell 20 arranged in the box 10 is multiple, the multiple cylindrical battery cells 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple cylindrical battery cells 20 are connected in series and in parallel. The multiple cylindrical battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole is accommodated in the box 10. Of course, the battery device 100 can also be that the multiple cylindrical battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 10.

[0225] In some embodiments, the battery device 100 can further include other structures, for example, the battery device 100 can further include a current collecting component, which is configured to connect the multiple cylindrical battery cells 20 to achieve electrical connection between the multiple cylindrical battery cells 20.

[0226] Each cylindrical battery cell 20 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0227] According to some embodiments of the present application, reference is made to Figure 3 , and further reference is made to Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , and Figure 9 ​, Figure 4 This is an exploded view of the structure of a cylindrical battery cell 20 provided in some embodiments of this application. Figure 5 This is a cross-sectional view of a cylindrical battery cell 20 provided in some embodiments of this application. Figure 6 for Figure 5 A magnified view of part A of the cylindrical battery cell 20 shown. Figure 7 This is a cross-sectional view of the first insulating member 25 of the cylindrical battery cell 20 provided in some embodiments of this application. Figure 8 This is a cross-sectional view of the electrode terminal 22 provided in some embodiments of this application. Figure 9 This is a cross-sectional view of a seal 24 provided in some embodiments of this application. This application provides a cylindrical battery cell 20, which includes a housing 21, electrode terminals 22, an electrode assembly 23, a seal 24, a first insulating member 25, and a second insulating member 26. The housing 21 has a wall portion 211, the thickness direction X of which is the axial direction of the cylindrical battery cell 20. The wall portion 211 has a mounting hole 2111 that penetrates the wall portion 211 along the thickness direction X. The electrode terminals 22 are disposed in the mounting hole 2111 and include a first limiting portion 2211 located on the side of the wall portion 211 facing the interior of the housing 21. The electrode assembly 23 is housed within the housing 21 and includes a main body portion 231 and a first tab 232. The first tab 232 protrudes from the end of the main body portion 231 facing the wall portion 211 and is electrically connected to the electrode terminal 22. A sealing element 24 is disposed between the electrode terminal 22 and the wall portion 211 to seal the electrode terminal 22 and the wall portion 211. The sealing element 24 is made of insulating material and includes a first sealing portion 241. The first sealing portion 241 is located between the wall portion 211 and the first limiting portion 2211 in the thickness direction X of the wall portion, and the first sealing portion 241 extends beyond the first limiting portion 2211 in the radial direction of the cylindrical battery cell 20 in a direction away from the central axis of the cylindrical battery cell 20. The first insulating member 25 includes a first insulating portion 251 disposed between the wall portion 211 and the first electrode tab 232 in the thickness direction X of the wall portion. The first insulating portion 251 is provided with a through hole 2511, which penetrates the first insulating portion 251 along the thickness direction X of the wall portion. At least a portion of the first sealing portion 241 and the first limiting portion 2211 are located within the through hole 2511. A first gap 27 is formed between the first sealing portion 241 and the hole wall surface of the through hole 2511 along the radial direction of the cylindrical battery cell 20. The second insulating member 26 is located between the wall portion 211 and the first electrode tab 232 in the thickness direction X of the wall portion, and the projection of the second insulating member 26 in the thickness direction X of the wall portion covers at least a portion of the first gap 27.

[0228] The shell 21 can also be used to contain an electrolyte, such as an electrolyte solution. The shell 21 can have various structural forms. The shell 21 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0229] The shell 21 has a wall portion 211, and the thickness direction X of the wall portion is the axial direction of the cylindrical battery monomer 20, that is, the wall portion 211 is an end wall of one end of the shell 21 in the axial direction of the cylindrical battery monomer 20.

[0230] The wall portion 211 is provided with a mounting hole 2111, which penetrates the wall portion 211 in the thickness direction X of the wall portion, that is, the mounting hole 2111 is a structure that extends in the thickness direction X of the wall portion and penetrates the surfaces of both sides of the wall portion 211.

[0231] In some embodiments, the shell 21 can include a shell body 212 and an end cover 213. The shell body 212 has an inner portion that forms a containing cavity with an opening 2121, that is, the shell body 212 is a hollow structure with one end open. The end cover 213 is attached to the opening 2121 of the shell body 212 and forms a sealed connection to form a sealed space for containing the electrode assembly 23 and the electrolyte.

[0232] The shell body 212 can include a bottom wall 2122 and a side wall 2123, and the side wall 2123 is arranged around the bottom wall 2122. One end of the side wall 2123 is connected to the bottom wall 2122, and the other end forms the opening 2121. The end cover 213 is arranged opposite the bottom wall 2122.

[0233] Optionally, the wall portion 211 provided with the electrode terminal 22 can be the bottom wall 2122 of the shell body 212, or the end cover 213 of the shell 21. For example, in Figure 3 and Figure 4 The wall portion 211 is the bottom wall 2122 of the shell body 212, and the electrode terminal 22 is arranged on the bottom wall 2122 of the shell body 212. The thickness direction of the bottom wall 2122 of the shell body 212 is the thickness direction X of the wall portion, and the end of the shell body 212 away from the electrode terminal 22 in the thickness direction X of the wall portion forms the opening 2121. Of course, in other embodiments, the wall portion 211 can also be the end cover 213 of the shell 21.

[0234] In assembling the cylindrical battery monomer 20, the electrode assembly 23 can be placed in the shell body 212, and the electrolyte can be filled into the shell body 212. The end cover 213 is then attached to the opening 2121 of the shell body 212 to close the opening 2121 of the shell body 212.

[0235] The cylindrical battery cell 20 is in a cylindrical shape, and a central axis of the cylindrical battery cell 20 extends along the thickness direction X of the wall portion, and correspondingly, the side wall 2123 of the shell 212 is also in a cylindrical structure, and a central axis of the shell 212 extends along the thickness direction X of the wall portion, so that the end cover 213 is circular in projection in the thickness direction X of the wall portion.

[0236] Understandably, the shell 21 is not limited to the above structure, and the shell 21 can also be other structures, for example, the shell 21 includes the shell 212 and two end covers 213, the shell 212 is a hollow structure with opposite openings 2121, one end cover 213 corresponds to cover the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte, that is, the shell 212 of the shell 21 only includes the side wall 2123, which is a hollow structure with openings 2121 at both ends in the thickness direction X of the wall portion, and the two end covers 213 cover the openings 2121 at both ends of the side wall 2123 in the thickness direction X of the wall portion, respectively, and correspondingly, one of the two end covers 213 is the wall portion 211.

[0237] It should be noted that the electrode assembly 23 is a component that undergoes an electrochemical reaction in the cylindrical battery cell 20, and the electrode assembly 23 includes a main body 231, a first tab 232, and a second tab 233. The main body 231 is the main component of the electrode assembly 23 that undergoes an electrochemical reaction in the cylindrical battery cell 20, and the first tab 232 and the second tab 233 serve to output or input the electrical energy of the electrode assembly 23. Among them, the structure of the electrode assembly 23 can be various, and exemplarily, in the Figure 4 , the electrode assembly 23 can include a positive electrode sheet, a separator, and a negative electrode sheet, and the electrode assembly 23 is a wound structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet, and the main body 231 of the electrode assembly 23 is in a cylindrical structure, and the central axis of the main body 231 of the electrode assembly 23 extends along the thickness direction X of the wall portion.

[0238] Exemplarily, the separator is a separator film, and the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0239] Optionally, the electrode assembly 23 accommodated in the shell 21 can be one or more. Exemplarily, in the Figure 4 , the shell 21 of the cylindrical battery cell 20 is provided with only one electrode assembly 23. Of course, the structure of the cylindrical battery cell 20 is not limited to this, and in other embodiments, the electrode assembly 23 accommodated in the shell 21 can also be two, three, four, five, six, seven, or eight, etc.

[0240] The first tab 232 and the second tab 233 are opposite in polarity, and the first tab 232 and the second tab 233 are connected to the two ends of the main body 231 in the thickness direction X of the wall portion, respectively. In the thickness direction X of the wall portion, the first tab 232 is protruded from one end of the main body 231 facing the wall portion 211, and the second tab 233 is protruded from the other end of the main body 231 away from the wall portion 211. Figure 4 and Figure 5 The first tab 232 and the second tab 233 are connected to the two ends of the main body 231 in the thickness direction X of the wall portion, respectively. In the thickness direction X of the wall portion, the first tab 232 is protruded from one end of the main body 231 facing the wall portion 211, and the second tab 233 is protruded from the other end of the main body 231 away from the wall portion 211.

[0241] It should be noted that if the first tab 232 is the positive tab of the electrode assembly 23, the first tab 232 is a component formed by stacking the regions of the positive plate on which the positive active material layer is not coated with each other, and correspondingly, if the second tab 233 is the negative tab of the electrode assembly 23, the second tab 233 is a component formed by stacking the regions of the negative plate on which the negative active material layer is not coated with each other; otherwise, if the first tab 232 is the negative tab of the electrode assembly 23, the first tab 232 is a component formed by stacking the regions of the negative plate on which the negative active material layer is not coated with each other, and correspondingly, if the second tab 233 is the positive tab of the electrode assembly 23, the second tab 233 is a component formed by stacking the regions of the positive plate on which the positive active material layer is not coated with each other.

[0242] It should be noted that the positive sheet includes a positive current collector, the positive current collector includes a positive coated area and a positive blank area arranged along the thickness direction X of the wall portion and connected, at least one side of the positive coated area in the thickness direction is coated with a positive active material layer, that is, the positive coated area of the positive current collector is coated with the positive active material layer, and the positive blank area of the positive current collector is not coated with the positive active material layer, correspondingly, the positive blank area includes a positive transition area and at least one positive tab area, the positive transition area is connected with the positive coated area, the at least one positive tab area is arranged at intervals along the winding direction of the positive sheet, and the positive tab area is connected to one end of the positive transition area away from the positive coated area in the thickness direction X of the wall portion, in the winding direction of the positive sheet, the length size of the positive transition area is the same as the length size of the positive coated area, after the positive sheet and the negative sheet are wound to form the electrode assembly 23, the at least one positive tab area forms the first tab 232 or the second tab 233 through the rubbing or smoothing process, optionally, in some embodiments, the positive transition area can also be coated with an insulating layer or the like coating, and the insulating layer is located at the edge of one end of the positive active material layer in the thickness direction X of the wall portion, in some embodiments, the insulating layer can also be a structure partially coated on one end of the positive tab area close to the positive transition area, that is, part of the insulating layer is coated on the positive transition area, and part of the insulating layer is coated on the positive tab area, of course, in other embodiments, the positive blank area can also not be provided with the positive transition area, correspondingly, the positive tab area is directly connected with the positive coated area, in this embodiment, the positive active material layer can also be a structure partially coated on one end of the positive tab area close to the positive coated area.Similarly, the negative electrode sheet includes a negative electrode current collector including a negative electrode coated region and a negative electrode blank region arranged along the thickness direction X of the wall portion and connected to each other, the negative electrode coated region being coated with a negative electrode active material layer on at least one side in the thickness direction thereof, i.e., the negative electrode coated region of the negative electrode current collector is coated with the negative electrode active material layer, while the negative electrode blank region of the negative electrode current collector is not coated with the negative electrode active material layer, correspondingly, the negative electrode blank region includes a negative electrode transition region and at least one negative electrode tab region, the negative electrode transition region being connected to the negative electrode coated region, the at least one negative electrode tab region being arranged at intervals in the winding direction of the negative electrode sheet, and the negative electrode tab region being connected to one end of the negative electrode transition region away from the negative electrode coated region in the thickness direction X of the wall portion, the length dimension of the negative electrode transition region being the same as the length dimension of the negative electrode coated region in the winding direction of the negative electrode sheet, after the positive electrode sheet and the negative electrode sheet are wound to form the electrode assembly 23, the at least one negative electrode tab region is formed into the first tab 232 or the second tab 233 through a rubbing or smoothing process, etc., optionally, in some embodiments, the negative electrode transition region can also be coated with an insulating layer or the like coating, and the insulating layer is located at the edge of one end of the negative electrode active material layer in the thickness direction X of the wall portion, in some embodiments, the insulating layer can also be a structure partially coated on one end of the negative electrode tab region close to the negative electrode transition region, i.e., part of the insulating layer is coated on the negative electrode transition region, and part of the insulating layer is coated on the negative electrode tab region, of course, in other embodiments, the negative electrode blank region can also not be provided with the negative electrode transition region, correspondingly, the negative electrode tab region is directly connected to the negative electrode coated region, in such embodiments, the negative electrode active material layer can also be a structure partially coated on one end of the negative electrode tab region close to the negative electrode coated region. Correspondingly, the positive electrode coated region and the positive electrode transition region of the positive electrode current collector, the negative electrode coated region and the negative electrode transition region of the negative electrode current collector, and the separator are wound to form the main body portion 231 of the electrode assembly 23, so that the first tab 232 and the second tab 233 are structures respectively protruding at two ends of the main body portion 231 in the thickness direction X of the wall portion. It should be noted that, in the structure in which the positive electrode blank region of the positive electrode current collector is not provided with the positive electrode transition region, the positive electrode coated region of the positive electrode current collector, the negative electrode coated region and the negative electrode transition region of the negative electrode current collector, and the separator are wound to form the main body portion 231 of the electrode assembly 23; in the structure in which the negative electrode blank region of the negative electrode current collector is not provided with the negative electrode transition region, the positive electrode coated region and the positive electrode transition region of the positive electrode current collector, the negative electrode coated region of the negative electrode current collector, and the separator are wound to form the main body portion 231 of the electrode assembly 23; and in the structure in which the positive electrode blank region of the positive electrode current collector is not provided with the positive electrode transition region, and the negative electrode blank region of the negative electrode current collector is not provided with the negative electrode transition region, the positive electrode coated region of the positive electrode current collector, the negative electrode coated region of the negative electrode current collector, and the separator are wound to form the main body portion 231 of the electrode assembly 23.

[0243] Exemplarily, the first tab 232 is a positive tab, that is, the first tab 232 is a component formed by a rubbing or smoothing process, etc. of at least one positive tab area of the positive sheet after the positive sheet and the negative sheet are wound with each other to form the electrode assembly 23, and correspondingly, the second tab 233 is a negative tab, that is, the second tab 233 is a component formed by a rubbing or smoothing process, etc. of at least one negative tab area of the negative sheet after the positive sheet and the negative sheet are wound with each other to form the electrode assembly 23.

[0244] It should be noted that the positive tab area formed by the positive blank area of the positive sheet can be one or multiple. If the positive tab area formed by the positive blank area is multiple, then the multiple positive tab areas are arranged in an interval along the winding direction of the positive sheet; if the positive tab area formed by the positive blank area is one, then the positive tab area is arranged continuously along the winding direction of the positive sheet. Similarly, the negative tab area formed by the negative blank area of the negative sheet can be one or multiple. If the negative tab area formed by the negative blank area is multiple, then the multiple negative tab areas are arranged in an interval along the winding direction of the negative sheet; if the negative tab area formed by the negative blank area is one, then the negative tab area is arranged continuously along the winding direction of the negative sheet.

[0245] In the embodiment of the present application, the electrode terminal 22 plays a role of inputting or outputting the electric energy of the cylindrical battery monomer 20, that is, the electrode terminal 22 serves as an output pole of the cylindrical battery monomer 20. Part of the electrode terminal 22 is arranged in the mounting hole 2111 and connected to the wall portion 211. Exemplarily, the material of the electrode terminal 22 can be various, for example, the material of the electrode terminal 22 can be copper, iron, aluminum, steel or aluminum alloy, etc.

[0246] Among them, the electrode terminal 22 is insulatedly mounted on the wall portion 211, that is, no electrical connection is formed between the electrode terminal 22 and the wall portion 211, and in combination with the fact that the electrode terminal 22 is arranged in the mounting hole 2111, the electrode terminal 22 is insulatedly arranged in the mounting hole 2111. Figure 6 and Figure 8As shown, the electrode terminal 22 is riveted to the wall portion 211, wherein the electrode terminal 22 includes a terminal body 221 and a protruding portion 222, the terminal body 221 is provided in the mounting hole 2111, and the terminal body 221 has a first limiting portion 2211 located at a side of the wall portion 211 facing the electrode assembly 23 and a second limiting portion 2212 located at a side of the wall portion 211 away from the electrode assembly 23, at least part of the wall portion 211 is located between the first limiting portion 2211 and the second limiting portion 2212 in the thickness direction X of the wall portion, so that the first limiting portion 2211 and the second limiting portion 2212 can cooperatively clamp the wall portion 211 to achieve riveting of the electrode terminal 22 to the wall portion 211, and the protruding portion 222 protrudes from an end of the terminal body 221 facing the main body portion 231 in the thickness direction X of the wall portion, and the protruding portion 222 is used for electrical connection with the first tab 232. Of course, in other embodiments, the electrode terminal 22 can also be clamped or adhered to the wall portion 211.

[0247] As shown in Figure 6 and Figure 9 As shown, a sealing member 24 is further provided between the electrode terminal 22 and the wall portion 211, and the sealing member 24 is configured to seal the gap between the electrode terminal 22 and the wall portion 211, wherein the sealing member 24 includes a first sealing portion 241, a second sealing portion 242 and a third sealing portion 243 connected in sequence, the first sealing portion 241 is located between the first limiting portion 2211 and the wall portion 211, the second sealing portion 242 is located between the terminal body 221 and the hole wall surface of the mounting hole 2111, and the third sealing portion 243 is located between the second limiting portion 2212 and the wall portion 211, thereby facilitating the sealing member 24 to seal the wall portion 211 and the electrode terminal 22, and improving the effect of the sealing member 24 to separate the wall portion 211 and the electrode terminal 22. It should be noted that in combination with Figure 6 and Figure 9 As shown, the first sealing portion 241 of the sealing member 24 is located in the through hole 2511 of the first insulating portion 251 and extends out of the outer circumferential surface of the first limiting portion 2211 in the radial direction of the cylindrical battery monomer 20, and a first gap 27 is formed between the first sealing portion 241 of the sealing member 24 and the hole wall surface of the through hole 2511 in the radial direction of the cylindrical battery monomer 20.

[0248] Wherein, the sealing member 24 is made of insulating material, so that the sealing member 24 is also configured to insulate and separate the electrode terminal 22 and the wall portion 211, so as to achieve insulating installation of the electrode terminal 22 on the wall portion 211.

[0249] Exemplarily, the material of the sealing member 24 can be various, for example, the material of the sealing member 24 can be silicone, plastic or rubber, etc.

[0250] It should be noted that the first sealing portion 241 is located between the wall portion 211 and the first limiting portion 2211 in the thickness direction X of the wall portion, and the first sealing portion 241 exceeds the first limiting portion 2211 in a direction away from the central axis of the cylindrical battery cell 20 in the radial direction of the cylindrical battery cell 20, that is, a part of the first sealing portion 241 is located between the wall portion 211 and the first limiting portion 2211 in the thickness direction X of the wall portion, and in a projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the part of the first sealing portion 241 surrounds the outer periphery of the orthographic projection of the first limiting portion 2211, so that the projection of the outer edge of the first limiting portion 2211 in the thickness direction X of the wall portion is located in the first sealing portion 241 of the sealing member 24.

[0251] In the embodiments of the present application, as shown in Figure 4 , Figure 5 and Figure 6 , the cylindrical battery cell 20 can further include a first current collecting member 28, the first current collecting member 28 is arranged between the first insulating portion 251 and the first tab 232 in the thickness direction X of the wall portion, and the first current collecting member 28 connects the protruding portion 222 of the electrode terminal 22 and the first tab 232 of the electrode assembly 23 to serve as an electrical connection between the electrode terminal 22 and the electrode assembly 23.

[0252] Optionally, the connection structure between the first tab 232 and the first current collecting member 28 and between the first current collecting member 28 and the electrode terminal 22 can be various, such as welding connection or bonding, etc. For example, the first tab 232 is welded to the first current collecting member 28, and the first current collecting member 28 is welded to the electrode terminal 22, such as laser welding or ultrasonic welding, etc.

[0253] It should be noted that the first tab 232 and the second tab 233 have opposite polarities, and the electrode terminal 22 is electrically connected to the first tab 232 through the first current collecting member 28, so that the electrode terminal 22 serves as one output pole of the cylindrical battery cell 20. Optionally, the second tab 233 can be electrically connected to the shell 21 to serve as another output pole of the cylindrical battery cell 20 through the shell 21. Of course, two electrode terminals 22 can also be mounted on the shell 21 in an insulating manner, and the two electrode terminals 22 are respectively electrically connected to the first tab 232 and the second tab 233 to serve as two output poles of the cylindrical battery cell 20 through the two electrode terminals 22.

[0254] For example, in Figure 5In the embodiment, the second tab 233 is electrically connected with the side wall 2123 of the shell 212, so that the side wall 2123 serves as another output pole of the cylindrical battery cell 20. Of course, in the embodiment in which the second tab 233 is electrically connected with the outer shell 21, the second tab 233 can also be electrically connected with the bottom wall 2122 of the shell 212 or the end cover 213 of the outer shell 21.

[0255] In some embodiments, referring to Figs. 1 and 2, Figure 4 and Figure 5 As shown in Figs. 1 and 2, the cylindrical battery cell 20 can further include a second current collecting member 29, which is located at one end of the electrode assembly 23 away from the wall portion 211 in the thickness direction X of the wall portion, and which connects the second tab 233 and the outer shell 21 to electrically connect the electrode assembly 23 and the outer shell 21.

[0256] In the embodiment, the side wall 2123 of the shell 212 has a protrusion 2123a protruding therefrom, and the second current collecting member 29 connects the protrusion 2123a and the second tab 233 to electrically connect the second tab 233 and the outer shell 21. Exemplarily, the protrusion 2123a is an annular structure extending in the circumferential direction of the cylindrical battery cell 20. Optionally, the surface of the side wall 2123 away from the electrode assembly 23 has a groove 2123b corresponding to the position of the protrusion 2123a, and the groove 2123b is also an annular groove extending in the circumferential direction of the cylindrical battery cell 20, so as to facilitate the stamping forming of the protrusion 2123a on the side wall 2123, and to facilitate the processing of the protrusion 2123a.

[0257] Optionally, the connection structure of the second current collecting member 29 and the second tab 233 and the connection structure of the second current collecting member 29 and the outer shell 21 can be various, such as welding connection or adhesive connection, etc. Exemplarily, the second tab 233 is welded to the second current collecting member 29, and the second current collecting member 29 is welded to the outer shell 21, such as laser welding or ultrasonic welding, etc.

[0258] Exemplarily, the material of the second current collecting member 29 can be various, such as copper, iron, aluminum, steel or aluminum alloy, etc.

[0259] It should be noted that in other embodiments, the second tab 233 of the electrode assembly 23 can also be directly connected with the outer shell 21, such as welding connection or adhesive connection, etc.

[0260] In the embodiment, the first insulating member 25 insulates and separates the first tab 232 and the wall portion 211. In the embodiment in which the cylindrical battery cell 20 further includes a first current collecting member 28, and the first current collecting member 28 is located between the first insulating portion 251 of the first insulating member 25 and the first tab 232, the first insulating member 25 can also insulate and separate the first current collecting member 28 and the wall portion 211.

[0261] The first insulating portion 251 is the part of the first insulating member 25 located between the wall portion 211 and the first tab 232 in the thickness direction X of the wall portion.

[0262] The first insulating part 251 is provided with a through hole 2511. The through hole 2511 is a structure that penetrates the surface of both sides of the first insulating part 251 along the thickness direction X of the wall. The electrode terminal 22 is partially disposed in the through hole 2511 so that the electrode terminal 22 can be connected to the first current collector 28.

[0263] For example, the material of the first insulating member 25 can be various, such as rubber, plastic or silicone.

[0264] Combination Figure 6 , Figure 8 and Figure 9 As shown, the first sealing portion 241 of the seal 24 is located between the first limiting portion 2211 and the wall portion 211 of the electrode terminal 22 and is located within the through hole 2511. The first sealing portion 241 of the seal 24 extends beyond the outer peripheral surface of the first limiting portion 2211 in the radial direction of the cylindrical battery cell 20, so that the first gap 27 is formed in the radial direction of the cylindrical battery cell 20 between the first sealing portion 241 of the seal 24 and the hole wall surface of the through hole 2511, so that the first gap 27 is an annular structure extending circumferentially along the through hole 2511.

[0265] In this embodiment, the second insulating member 26 serves to block the first gap 27 between the sealing member 24 and the hole wall surface of the through hole 2511 between the wall portion 211 and the first electrode 232. The projection of the second insulating member 26 in the thickness direction X of the wall portion covers at least a portion of the first gap 27. That is, part or all of the projection of the first gap 27 in the thickness direction X of the wall portion is located within the second insulating member 26.

[0266] The second insulating member 26 is located between the wall portion 211 and the first electrode tab 232 in the thickness direction X of the wall portion. The second insulating member 26 may be a structure disposed between the wall portion 211 and the first insulating portion 251, or a structure disposed between the first insulating portion 251 and the first electrode tab 232, or a structure disposed within the through hole 2511.

[0267] For example, the material of the second insulating element 26 can be various, such as rubber, plastic or silicone.

[0268] In some embodiments, the cylindrical battery cell 20 may further include a pressure relief component disposed on the housing 21, which is used to release the internal pressure of the cylindrical battery cell 20 when the internal pressure or temperature of the cylindrical battery cell 20 reaches a predetermined value.

[0269] The pressure relief component can be arranged on the end cover 213 of the shell 21 or arranged on the shell body 212. Similarly, the pressure relief component and the shell 21 can be an integrally formed structure or a separately arranged structure. If the pressure relief component and the shell 21 are an integrally formed structure, the pressure relief component is a region of the shell 21 that has a weak structure, for example, the shell 21 is provided with a pressure relief groove, and the shell 21 is configured to be split along at least part of the pressure relief groove when the cylindrical battery monomer 20 is relieved of pressure, so as to release the internal pressure of the cylindrical battery monomer 20, that is, the region of the shell 21 provided with the pressure relief groove is the pressure relief component. Of course, in other embodiments, the pressure relief component and the shell 21 can also be a separately arranged structure, and the pressure relief component can be connected to the shell 21 by welding or the like. Correspondingly, the pressure relief component can be a component such as a rupture disc, a pressure relief valve, a gas valve, a pressure relief valve, or a safety valve.

[0270] In this embodiment, the sealing member 24 includes a first sealing portion 241 arranged between the first limiting portion 2211 of the electrode terminal 22 and the wall portion 211, so that the sealing member 24 can seal the gap between the electrode terminal 22 and the wall portion 211, to alleviate the risk of leakage of the cylindrical battery monomer 20 from the mounting hole 2111 during use, and the first sealing portion 241 of the sealing member 24 is arranged to be located within the through hole 2511 and to extend beyond the first limiting portion 2211 in a direction away from the central axis of the cylindrical battery monomer 20 in the radial direction of the cylindrical battery monomer 20, so that a first gap 27 is formed between the first sealing portion 241 and the hole wall surface of the through hole 2511, to facilitate assembly of the first sealing portion 241 of the sealing member 24 within the through hole 2511, and to facilitate reduction of assembly interference between the first sealing portion 241 of the sealing member 24 and the first insulating portion 251 of the first insulating member 25. By arranging the second insulating member 26 between the wall portion 211 and the first tab 232, and the projection of the second insulating member 26 in the thickness direction X of the wall portion covers at least part of the first gap 27 between the first sealing portion 241 and the first insulating portion 251, so that the second insulating member 26 can shield the first gap 27, thereby increasing the creepage distance of the wall portion 211 and the first tab 232 at the first gap 27, and achieving a certain blocking effect of the second insulating member 26 between the first tab 232 and the wall portion 211, thereby effectively alleviating the phenomenon of the first tab 232 inserted into the first gap 27 overlapping with the wall portion 211 or the first tab 232 and the wall portion 211 being electrically broken at the first gap 27, and facilitating reduction of the risk of internal short circuit of the cylindrical battery monomer 20 during use, to improve the use reliability of the cylindrical battery monomer 20.

[0271] According to some embodiments of the present application, referring to Figure 6As shown, the projection of the second insulating member 26 on the thickness direction X of the wall portion covers the entirety of the first gap 27. That is, the projection of the first gap 27 on the thickness direction X of the wall portion is entirely located within the second insulating member 26.

[0272] In the present embodiment, by setting the projection of the second insulating member 26 on the thickness direction X of the wall portion to cover the entirety of the first gap 27 between the first sealing portion 241 and the first insulating portion 251, the blocking effect of the second insulating member 26 on the first tab 232 and the wall portion 211 at the first gap 27 is further improved, so that the phenomenon of the first tab 232 being inserted into the first gap 27 and being lapped with the wall portion 211 or the first tab 232 and the wall portion 211 being electrically broken at the first gap 27 can be further alleviated, which is beneficial to further reducing the risk of internal short circuit of the cylindrical battery monomer 20 during use.

[0273] According to some embodiments of the present application, referring to Figure 6 and Figure 7 As shown, the second insulating member 26 protrudes on the hole wall surface of the through hole 2511.

[0274] Among them, the second insulating member 26 protrudes on the hole wall surface of the through hole 2511, that is, the second insulating member 26 is a structure located in the through hole 2511 and connected to the hole wall surface of the through hole 2511. Optionally, the second insulating member 26 can be an integral structure with the first insulating portion 251, or a separate structure, for example, the second insulating member 26 can be connected to the hole wall surface of the through hole 2511 through bonding or clamping structure, etc.

[0275] In the present embodiment, by setting the second insulating member 26 as a structure protruding on the hole wall surface of the through hole 2511 of the first insulating portion 251, the second insulating member 26 is a structure connected to the hole wall surface of the through hole 2511 of the first insulating portion 251, so that the second insulating member 26 can share part of the space with the first insulating portion 251 in the thickness direction X of the wall portion, which is beneficial to alleviate the phenomenon that the second insulating member 26 occupies the space between the wall portion 211 and the first insulating portion 251 or the first tab 232 and the first insulating portion 251 in the thickness direction X of the wall portion, so as to improve the internal space utilization rate of the cylindrical battery monomer 20, and improve the energy density of the cylindrical battery monomer 20.

[0276] In some embodiments, referring to Figure 7 As shown, the second insulating member 26 is integrally formed with the first insulating portion 251. That is, the second insulating member 26 and the first insulating portion 251 are an integral structure formed by an integral molding process, such as injection molding or extrusion molding, etc. Correspondingly, the second insulating member 26 is a convex structure protruding on the hole wall surface of the through hole 2511, and the second insulating member 26 is an annular structure extending along the circumference of the through hole 2511.

[0277] In this embodiment, by setting the second insulating member 26 and the first insulating portion 251 of the first insulating member 25 as an integrally formed structure, on the one hand, the reliability and stability of the second insulating member 26 protruding from the hole wall of the through hole 2511 of the first insulating portion 251 can be improved, which helps to reduce the risk of the second insulating member 26 falling off the first insulating portion 251 during use, thereby improving the reliability of the second insulating member 26 blocking the first gap 27. On the other hand, it can reduce the difficulty of setting the second insulating member 26 on the hole wall of the through hole 2511 of the first insulating portion 251, which helps to reduce the manufacturing difficulty of the cylindrical battery cell 20.

[0278] According to some embodiments of this application, refer to Figure 10 and Figure 11 , Figure 10 A cross-sectional view of a cylindrical battery cell 20 provided in some embodiments of this application. Figure 11 for Figure 10 The image shows a partial enlarged view of point B on the cylindrical battery cell 20. The cylindrical battery cell 20 may further include a first current collector 28 disposed between the first insulating portion 251 and the first tab 232. The first current collector 28 connects the electrode terminal 22 and the first tab 232 to electrically connect them. Along the thickness direction X of the wall portion, a second insulating member 26 is disposed between the first insulating portion 251 and the first current collector 28.

[0279] Along the thickness direction X of the wall portion, the second insulating member 26 is disposed between the first insulating portion 251 and the first current collector 28. That is, the second insulating member 26 is located on the side of the first insulating portion 251 facing the first current collector 28 in the thickness direction X of the wall portion.

[0280] In this embodiment, by placing the second insulating member 26 between the first insulating part 251 and the first current collector 28, it is beneficial to reduce the assembly difficulty of the second insulating member 26 and improve the production efficiency of the cylindrical battery cell 20.

[0281] In some embodiments, see Figure 11 As shown, the second insulating member 26 is connected to the surface of the first current collector 28 facing the first insulating part 251.

[0282] For example, the second insulating member 26 is bonded to the surface of the first current collector 28 facing the wall portion 211. The second insulating member 26 may be insulating tape, insulating paper or insulating film, etc., bonded to the first current collector 28.

[0283] In the embodiment, by arranging the second insulation member 26 to be connected to the surface of the first current collecting member 28 facing the wall portion 211, on the one hand, the stability and reliability of the arrangement of the second insulation member 26 between the first insulation portion 251 and the first current collecting member 28 can be improved, and the phenomenon of movement or displacement of the second insulation member 26 during use can be reduced; on the other hand, the second insulation member 26 can be arranged on the first current collecting member 28 and then assembled into the shell 21 together with the first current collecting member 28, which can reduce the assembly difficulty of the second insulation member 26 and optimize the production rhythm of the cylindrical battery cell 20.

[0284] Of course, the assembly structure of the second insulation member 26 is not limited to this, and in other embodiments, the assembly structure of the second insulation member 26 can also be other structures, for example, the second insulation member 26 is connected to the surface of the first insulation portion 251 facing the first current collecting member 28.

[0285] For example, the second insulation member 26 can be a structure adhered to the surface of the first insulation portion 251 facing the first current collecting member 28, and the second insulation member 26 can be an insulating tape, an insulating paper, or an insulating film adhered to the first insulation portion 251.

[0286] In the embodiment, by arranging the second insulation member 26 to be connected to the surface of the first insulation portion 251 facing the first current collecting member 28, on the one hand, the stability and reliability of the arrangement of the second insulation member 26 between the first insulation portion 251 and the first current collecting member 28 can be improved, and the phenomenon of movement or displacement of the second insulation member 26 during use can be reduced; on the other hand, the second insulation member 26 can be assembled to the first insulation portion 251 and shield the first gap 27 first, and then the first current collecting member 28 is assembled, which can reduce the assembly difficulty of the second insulation member 26 and improve the shielding effect of the second insulation member 26 on the first gap 27.

[0287] In some embodiments, please continue to refer to Figure 11 As shown, the first current collecting member 28 includes a terminal connecting area 282 connected with the electrode terminal 22. In the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the terminal connecting area 282 does not overlap with the orthographic projection of the second insulation member 26. That is, in the structure that the second insulation member 26 is located between the first current collecting member 28 and the first insulation portion 251, the orthographic projections of the terminal connecting area 282 and the second insulation member 26 in the thickness direction X of the wall portion do not overlap.

[0288] In the embodiment, by setting the first current collecting member 28 used for the terminal connecting area 282 connected with the electrode terminal 22 to a structure in which the projection in the thickness direction X of the wall portion and the projection in the thickness direction X of the second insulating member 26 do not overlap each other, the shielding and interference of the second insulating member 26 on the terminal connecting area 282 can be reduced, the connection difficulty between the terminal connecting area 282 and the electrode terminal 22 can be reduced, and the assembly quality between the terminal connecting area 282 and the electrode terminal 22 can be improved.

[0289] According to some embodiments of the present application, referring to Figure 11 As shown in the figure, the terminal connecting area 282 is welded with the electrode terminal 22 to form a connecting portion 30, and the connecting portion 30 and the second insulating member 26 are arranged at intervals in the radial direction of the cylindrical battery monomer 20 and the interval is greater than or equal to 5 mm.

[0290] The connecting portion 30 formed by the welding of the terminal connecting area 282 and the electrode terminal 22 is a welding mark formed by the welding of the terminal connecting area 282 and the electrode terminal 22 with each other.

[0291] The connecting portion 30 and the second insulating member 26 are arranged at intervals in the radial direction of the cylindrical battery monomer 20 and the interval is greater than or equal to 5 mm, that is, in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the connecting portion 30 and the orthographic projection of the second insulating member 26 are arranged at intervals in the radial direction of the cylindrical battery monomer 20, and the interval of the orthographic projection of the connecting portion 30 and the orthographic projection of the second insulating member 26 in the radial direction of the cylindrical battery monomer 20 is greater than or equal to 5 mm.

[0292] Exemplarily, the interval of the connecting portion 30 and the second insulating member 26 in the radial direction of the cylindrical battery monomer 20 can be 5 mm, 5.1 mm, 5.2 mm, 5.5 mm, 5.8 mm, 6 mm, 6.2 mm, 6.5 mm, 6.8 mm, 7 mm, 7.2 mm, 7.5 mm, 7.8 mm, 8 mm, 8.2 mm, 8.5 mm, 8.8 mm, or 9 mm, etc.

[0293] In the embodiment, by setting the second insulating member 26 and the connecting portion 30 to a structure arranged at intervals in the radial direction of the cylindrical battery monomer 20 and the interval distance is greater than or equal to 5 mm, the separation distance of the second insulating member 26 and the connecting portion 30 in the radial direction of the cylindrical battery monomer 20 can be improved, so that the risk of the second insulating member 26 being damaged by the high temperature of the connecting portion 30 in the process of welding the terminal connecting area 282 and the electrode terminal 22 to form the connecting portion 30 can be reduced, and the phenomenon of insulation failure of the second insulating member 26 after being damaged can be reduced, so as to improve the production quality and use reliability of the cylindrical battery monomer 20.

[0294] Of course, the structure of the cylindrical battery cell 20 is not limited to this, and in other embodiments, the cylindrical battery cell 20 can also be other structures, for example, the second insulation member 26 is arranged between the first insulation portion 251 and the wall portion 211 in the thickness direction X of the wall portion. That is, the second insulation member 26 is located on the side of the first insulation portion 251 facing the wall portion 211 in the thickness direction X of the wall portion.

[0295] In the present embodiment, by arranging the second insulation member 26 between the first insulation portion 251 and the wall portion 211, it is beneficial to reduce the shielding and interference between the second insulation member 26 and the terminal connection area 282, so as to reduce the connection difficulty between the terminal connection area 282 and the electrode terminal 22.

[0296] Optionally, the second insulation member 26 is connected to the surface of the wall portion 211 facing the first insulation portion 251.

[0297] For example, the second insulation member 26 is bonded to the surface of the wall portion 211 facing the first insulation portion 251, and the second insulation member 26 can be an insulation tape, insulation paper or insulation film bonded to the wall portion 211, of course, in some embodiments, the second insulation member 26 can also be an insulation coating coated on the surface of the wall portion 211 facing the first insulation portion 251.

[0298] In the present embodiment, by arranging the second insulation member 26 to be connected to the surface of the wall portion 211 facing the first insulation portion 251, it is beneficial to improve the stability and reliability of the second insulation member 26 arranged between the first insulation portion 251 and the wall portion 211, so as to reduce the phenomenon of the second insulation member 26 moving or shifting during use.

[0299] Optionally, in the embodiment in which the second insulation member 26 is arranged between the first insulation portion 251 and the wall portion 211, the orthographic projection of the second insulation member 26 partially overlaps the orthographic projection of the first sealing portion 241 of the sealing member 24 in the projection plane perpendicular to the thickness direction X of the wall portion. That is, part of the second insulation member 26 is located between the first sealing portion 241 of the sealing member 24 and the wall portion 211 in the thickness direction X of the wall portion, so that the wall portion 211 and the first sealing portion 241 are structures clamping the part of the second insulation member 26.

[0300] In the embodiment, by setting the second insulating member 26 and the part of the first sealing portion 241 in the thickness direction X of the wall portion to be overlapped with each other, the part of the second insulating member 26 is located between the first sealing portion 241 of the sealing member 24 and the wall portion 211 in the thickness direction X of the wall portion, so that on the one hand, the stability and reliability of the second insulating member 26 arranged between the wall portion 211 and the first insulating portion 251 can be further improved, so as to further reduce the phenomenon of the second insulating member 26 moving or shifting during use, and on the other hand, the shielding effect of the second insulating member 26 on the first gap 27 can be further improved, so as to further reduce the risk of short circuit or electrical breakdown of the wall portion 211 and the first tab 232 at the first gap 27.

[0301] According to some embodiments of the present application, as shown in Figure 10 and Figure 11 , in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the second insulating member 26 partially overlaps with the orthographic projection of the first insulating portion 251. That is, in the thickness direction X of the wall portion, the part of the second insulating member 26 and the part of the first insulating portion 251 are arranged in a mutually stacked structure. Correspondingly, the second insulating member 26 is arranged between the wall portion 211 and the first insulating portion 251 or between the first tab 232 and the first insulating portion 251 in the thickness direction X of the wall portion.

[0302] In the embodiment, by setting the projection of the second insulating member 26 in the thickness direction X of the wall portion to overlap with the part of the first insulating portion 251, the second insulating member 26 is arranged on one side of the first insulating portion 251 in the thickness direction X of the wall portion, so that the second insulating member 26 and the first insulating portion 251 have an overlapping area, thereby improving the shielding effect of the second insulating member 26 on the first gap 27, and further reducing the risk of short circuit or electrical breakdown of the wall portion 211 and the first tab 232 at the first gap 27.

[0303] According to some embodiments of the present application, as shown in Figure 4 , Figure 5 and Figure 6 , the cylindrical battery cell 20 can further include a first current collecting member 28. The first current collecting member 28 is arranged between the first insulating portion 251 and the first tab 232 in the thickness direction X of the wall portion, and the first current collecting member 28 connects the electrode terminal 22 and the first tab 232 to electrically connect the first tab 232 and the electrode terminal 22.

[0304] The first current collecting member 28 serves to electrically connect the electrode terminal 22 and the electrode assembly 23, and the material of the first current collecting member 28 can be various, such as copper, iron, aluminum, steel or aluminum alloy, etc.

[0305] In the present embodiment, by arranging the first current collecting member 28 between the first insulating part 251 of the first insulating piece 25 and the first tab 232, and connecting the electrode terminal 22 and the first tab 232 through the first current collecting member 28, the difficulty of electrical connection between the first tab 232 and the electrode terminal 22 can be reduced while achieving insulation isolation of the first current collecting member 28 and the wall part 211 through the first insulating piece 25, so as to reduce the assembly difficulty of the cylindrical battery monomer 20. In addition, by arranging the second insulating piece 26 between the wall part 211 and the first current collecting member 28 in the thickness direction X of the wall part, the second insulating piece 26 can also play a certain blocking effect on the wall part 211 and the first current collecting member 28 at the first gap 27, which is conducive to reducing the risk of electrical breakdown of the first current collecting member 28 and the wall part 211 at the first gap 27, so as to improve the use reliability of the cylindrical battery monomer 20.

[0306] According to some embodiments of the present application, refer to Figure 4 , Figure 5 and Figure 6 , and further refer to Figure 12 , Figure 12 the structural schematic diagram of the first current collecting member 28 provided by some embodiments of the present application. The first current collecting member 28 can include a current collecting body area 281, a terminal connecting area 282 and an elastic area 283. At least part of the current collecting body area 281 is arranged between the first insulating part 251 and the first tab 232 in the thickness direction X of the wall part, and the current collecting body area 281 is electrically connected with the first tab 232. The terminal connecting area 282 is connected to the electrode terminal 22. The elastic area 283 connects the current collecting body area 281 and the terminal connecting area 282, and the elastic area 283 is configured to be able to deform when the terminal connecting area 282 and the current collecting body area 281 approach or move away from each other in the thickness direction X of the wall part.

[0307] Among them, at least part of the current collecting body area 281 is arranged between the first insulating part 251 and the first tab 232 in the thickness direction X of the wall part, and the current collecting body area 281 is electrically connected with the first tab 232, that is, the first current collecting member 28 has the current collecting body area 281 located between the first insulating part 251 and the first tab 232 in the thickness direction X of the wall part, and the current collecting body area 281 plays a role of electrical connection with the first tab 232.

[0308] It should be noted that the current collecting body area 281 can be a structure directly connected with the first tab 232, or an indirectly connected structure. Exemplarily, refer to Figure 12As shown, the first current collecting member 28 can further include a tab connecting region 284 connected to the current collecting body region 281, and the tab connecting region 284 is connected to the first tab 232 to electrically connect the first tab 232 and the current collecting body region 281. For example, the tab connecting region 284 is welded to the first tab 232.

[0309] The terminal connecting region 282 is connected to the electrode terminal 22, that is, the structure in which the terminal connecting region 282 and the electrode terminal 22 are connected to each other in the first current collecting member 28, such as welding or bonding.

[0310] For example, the terminal connecting region 282 is connected to the end surface of the electrode terminal 22 close to one end of the main body part 231 in the thickness direction X of the wall part.

[0311] The elastic region 283 connects the current collecting body region 281 and the terminal connecting region 282, that is, the structure in which the current collecting body region 281 and the terminal connecting region 282 of the first current collecting member 28 are connected to each other through the elastic region 283.

[0312] In the thickness direction X of the wall part, the elastic region 283 is configured to be deformed when the terminal connecting region 282 and the wall part 211 are close to or away from each other, that is, the elastic region 283 can be deformed when the current collecting body region 281 and the terminal connecting region 282 of the first current collecting member 28 are close to or away from each other by being compressed or stretched in the thickness direction X of the wall part, and it should be noted that the elastic region 283 can be elastically deformed or plastically deformed when deformed.

[0313] Optionally, the number of elastic regions 283 connected between the current collecting body region 281 and the terminal connecting region 282 can also be one or multiple.

[0314] In the embodiment, the first current collecting member 28 is provided with a current collecting body region 281, an elastic region 283 and a terminal connecting region 282, the elastic region 283 is connected between the current collecting body region 281 and the terminal connecting region 282, the current collecting body region 281 is electrically connected with the first tab 232, and the terminal connecting region 282 is connected with the electrode terminal 22 to realize the electrical connection between the electrode terminal 22 and the electrode assembly 23. The elastic region 283 is provided with the ability of deformation, so that the elastic region 283 can be deformed when the terminal connecting region 282 and the current collecting body region 281 are close to or away from each other along the thickness direction X of the wall portion. On the one hand, the terminal connecting region 282 can move along the thickness direction X of the wall portion when it is pressed, so as to absorb the assembly error between the electrode terminal 22 and the terminal connecting region 282, which is beneficial to improve the assembly quality between the electrode terminal 22 and the terminal connecting region 282. On the other hand, the elastic region 283 can play a certain buffering role between the current collecting body region and the terminal connecting region 282, so as to relieve the rigid pulling between the current collecting body region and the terminal connecting region 282, between the terminal connecting region 282 and the electrode terminal 22, and between the current collecting body region and the first tab 232 during the shaking or displacement of the electrode assembly 23, which is beneficial to reduce the risk of electrical connection failure between the electrode terminal 22 and the electrode assembly 23, and is beneficial to reduce the phenomenon of damage of the first current collecting member 28 caused by pulling, thereby effectively improving the use stability and service life of the cylindrical battery cell 20.

[0315] According to some embodiments of the present application, as shown in Figure 6 and Figure 12 , in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the terminal connecting region 282 and the orthographic projection of the current collecting body region 281 do not overlap. That is, the projection of the terminal connecting region 282 in the thickness direction X of the wall portion does not fall into the current collecting body region 281.

[0316] Exemplarily, the current collecting body region 281 is a ring structure arranged around the terminal connecting region 282, and the terminal connecting region 282 is arranged spaced apart from the current collecting body region 281 in the radial direction of the cylindrical battery cell 20, so as to realize that the projections of the terminal connecting region 282 and the current collecting body region 281 in the thickness direction X of the wall portion do not overlap. Correspondingly, the elastic region 283 is connected between the terminal connecting region 282 and the current collecting body region 281. The radial direction of the cylindrical battery cell 20 is perpendicular to the thickness direction X of the wall portion, and is the direction in which the outer circumferential surface of the cylindrical battery cell 20 points to the central axis of the cylindrical battery cell 20 or the central axis of the cylindrical battery cell 20 points to the outer circumferential surface of the cylindrical battery cell 20 in the projection plane perpendicular to the thickness direction X of the wall portion.

[0317] In the embodiment, by setting the terminal connecting area 282 and the current collecting body area 281 as a structure in which the projections in the thickness direction X of the wall portion do not overlap, the terminal connecting area 282 can reduce the blocking and interference effects of the current collecting body area 281 when moving towards or away from the current collecting body area 281 in the thickness direction X of the wall portion, which is beneficial to expand the movement range of the terminal connecting area 282 relative to the current collecting body area 281 in the thickness direction X of the wall portion, thereby further improving the deformation degree of the elastic area 283 in the thickness direction X of the wall portion, and further improving the effect of the elastic area 283 absorbing the assembly error between the electrode terminal 22 and the terminal connecting area 282, to further improve the assembly quality between the electrode terminal 22 and the terminal connecting area 282, and further improve the buffering effect of the elastic area 283 between the current collecting body area and the terminal connecting area 282, to further reduce the risk of electrical connection failure between the electrode terminal 22 and the electrode assembly 23.

[0318] According to some embodiments of the present application, referring to Figure 12 the projection of the elastic area 283 in the thickness direction X of the wall portion does not fall into the current collecting body area 281.

[0319] Exemplarily, the current collecting body area 281 is a ring structure arranged around the terminal connecting area 282, the terminal connecting area 282 is arranged in a radial direction of the cylindrical battery cell 20 and spaced apart from the current collecting body area 281, and the two ends of the elastic area 283 in its extension direction are respectively connected to the outer peripheral surface of the terminal connecting area 282 and the inner peripheral surface of the current collecting body area 281, so as to realize the projection of the elastic area 283 and the current collecting body area 281 in the thickness direction X of the wall portion do not overlap.

[0320] It should be noted that the elastic area 283 and the current collecting body area 281 can be directly connected, that is, one end of the elastic area 283 in its extension direction is directly connected to the inner peripheral surface of the current collecting body area 281, of course, the elastic area 283 and the current collecting body area 281 can be indirectly connected, for example, in Figure 12 the first current collecting member 28 can further include a base area 285, and the elastic area 283 is connected to the inner peripheral surface of the current collecting body area 281 through the base area 285.

[0321] In this embodiment, by setting the elastic region 283 and the current collector body region 281 to a structure in which their projections in the thickness direction X of the wall do not overlap, the obstruction and interference of the current collector body region 281 on the elastic region 283 can be reduced when the terminal connection region 282 and the current collector body region 281 move closer or further away from each other along the thickness direction X of the wall, causing the elastic region 283 to deform. This allows the elastic region 283 to deform better during assembly or use, which is beneficial to expanding the degree of deformation of the elastic region 283 in the thickness direction X of the wall. This further enhances the effect of the elastic region 283 in absorbing assembly errors between the electrode terminal 22 and the terminal connection region 282, thereby further improving the assembly quality between the electrode terminal 22 and the terminal connection region 282. It also further enhances the buffering effect of the elastic region 283 between the current collector body region and the terminal connection region 282, thereby further reducing the risk of electrical connection failure between the electrode terminal 22 and the electrode assembly 23.

[0322] According to some embodiments of this application, please refer to Figure 6 and Figure 12 As shown, the electrode terminals 22 and the terminal connection area 282 are arranged along the thickness direction X of the wall portion. Along the thickness direction X of the wall portion, the terminal connection area 282 has a first surface 2821 facing away from the main body portion 231, and the electrode terminals 22 have a connection surface 223 facing the main body portion 231. The connection surface 223 and the first surface 2821 are welded together.

[0323] The first surface 2821 is the surface of the terminal connection area 282 facing the electrode terminal 22 in the thickness direction X of the wall portion, and is also the surface on which the terminal connection area 282 and the electrode terminal 22 are connected to each other. Similarly, the connection surface 223 is the end face of the electrode terminal 22 in the thickness direction X of the wall portion near the end of the main body portion 231.

[0324] The electrode terminal 22 and the terminal connection area 282 are arranged and connected along the thickness direction X of the wall portion, and the connection surface 223 and the first surface 2821 are welded together, such that the end of the electrode terminal 22 near the main body portion 231 in the thickness direction X of the wall portion is welded to the side of the terminal connection area 282 away from the main body portion 231. The connection surface 223 and the first surface 2821 are welded together to form the connection portion 30.

[0325] Optionally, the connecting surface 223 of the electrode terminal 22 and the first surface 2821 of the terminal connection area 282 are parallel and fit together, and both the connecting surface 223 of the electrode terminal 22 and the first surface 2821 of the terminal connection area 282 are perpendicular to the thickness direction X of the wall.

[0326] In the embodiment, by arranging the electrode terminal 22 and the terminal connecting area 282 in the thickness direction X of the wall portion, and welding the first surface 2821 of the terminal connecting area 282 away from the main body portion 231 and the connecting surface 223 of the electrode terminal 22 facing the main body portion 231, on the one hand, the assembly difficulty between the electrode terminal 22 and the terminal connecting area 282 can be reduced, and the connection stability and overcurrent stability between the terminal connecting area 282 and the electrode terminal 22 can be improved. On the other hand, the assembly error between the electrode terminal 22 and the terminal connecting area 282 can be absorbed under the action of the elastic area 283, so that the welding gap between the terminal connecting area 282 and the electrode terminal 22 can be relieved, which is beneficial to reduce the risk of false welding between the terminal connecting area 282 and the electrode terminal 22, so as to improve the welding quality between the terminal connecting area 282 and the electrode terminal 22.

[0327] According to some embodiments of the present application, as shown in Figure 6 , Figure 7 and Figure 12 , in the thickness direction X of the wall portion, the first insulation portion 251 has a second surface 2512 facing the first tab 232, and the second surface 2512 is farther away from the main body portion 231 than the connecting surface 223. That is, one end of the electrode terminal 22 close to the main body portion 231 in the thickness direction X of the wall portion is protruding from the side of the first insulation portion 251 facing the main body portion 231.

[0328] In the embodiment, by arranging the second surface 2512 of the first insulation portion 251 facing the first tab 232 to be closer to the main body portion 231 than the connecting surface 223 of the electrode terminal 22 and the terminal connecting area 282 in the thickness direction X of the wall portion, one end of the electrode terminal 22 close to the main body portion 231 in the thickness direction X of the wall portion is protruding from the side of the first insulation portion 251 facing the first tab 232. Thus, on the one hand, the interference of the first insulation portion 251 to the electrode terminal 22 can be reduced, so as to facilitate the welding connection between the connecting surface 223 of the electrode terminal 22 and the first surface 2821 of the terminal connecting area 282. On the other hand, the electrode terminal 22 can be pressed against the terminal connecting area 282 in the thickness direction X of the wall portion, which is beneficial to improve the abutting effect between the first surface 2821 and the connecting surface 223, so as to effectively improve the welding quality between the first surface 2821 and the connecting surface 223, and reduce the phenomenon of false welding between the terminal connecting area 282 and the electrode terminal 22.

[0329] According to some embodiments of the present application, please continue to refer to Figure 6 and Figure 12As shown, along the thickness direction X of the wall portion, the current collection body region 281 has a third surface 2811 facing away from the body portion 231, and the third surface 2811 is further away from the body portion 231 than the first surface 2821. That is, the electrode terminal 22 is configured to press the terminal connection region 282 in the direction of the body portion 231 in the thickness direction X of the wall portion, so that the side of the terminal connection region 282 facing away from the body portion 231 is sunken in the direction of the body portion 231 compared to the side of the current collection body region 281 facing away from the body portion 231.

[0330] The third surface 2811 of the current collection body region 281 is a surface of the current collection body region 281 facing the wall portion 211 in the thickness direction X of the wall portion, and is also a surface of the current collection body region 281 facing the first insulating portion 251 in the thickness direction X of the wall portion. Exemplarily, the third surface 2811 of the current collection body region 281 abuts against the second surface 2512 of the first insulating portion 251.

[0331] In this embodiment, by setting the third surface 2811 of the current collection body region 281 facing away from the body portion 231 to be further away from the body portion 231 than the first surface 2821 of the terminal connection region 282 connecting the electrode terminal 22 in the thickness direction X of the wall portion, the electrode terminal 22 is configured to press the terminal connection region 282 in the direction of the body portion 231 in the thickness direction X of the wall portion. On the one hand, this can reduce the assembly gap between the first surface 2821 of the terminal connection region 282 and the connecting surface 223 of the electrode terminal 22, and is conducive to further improving the welding quality between the terminal connection region 282 and the electrode terminal 22. On the other hand, this can also achieve a structure in which the connecting surface 223 of the electrode terminal 22 is closer to the body portion 231 than the third surface 2811 in the thickness direction X of the wall portion, so that the electrode terminal 22 and the current collection body region 281 can also share part of the space in the thickness direction X of the wall portion, which is conducive to improving the internal space utilization rate of the cylindrical battery cell 20.

[0332] In some embodiments, referring to Figure 6 and Figure 12 As shown, along the thickness direction X of the wall portion, the terminal connection region 282 has a fourth surface 2822 facing the body portion 231, and the current collection body region 281 has a fifth surface 2812 facing the body portion 231, and the fifth surface 2812 is further away from the body portion 231 than the fourth surface 2822.

[0333] In the present embodiment, by further setting the fourth surface 2822 of the terminal connection region 282 facing the main body portion 231 to be closer to the main body portion 231 than the fifth surface 2812 of the current collecting main body region 281 facing the main body portion 231 in the thickness direction X of the wall portion, the terminal connection region 282 is configured to be recessed as a whole in the thickness direction X of the wall portion toward the main body portion 231 compared to the current collecting main body region 281, so that the effect of the electrode terminal 22 pressing the terminal connection region 282 can be further improved, so as to reduce the assembly gap between the first surface 2821 of the terminal connection region 282 and the connecting surface 223 of the electrode terminal 22, and to further improve the welding quality between the terminal connection region 282 and the electrode terminal 22.

[0334] In some embodiments, reference is made to Figure 6 , and further reference is made to Figure 13 , Figure 13 A partial cross-sectional view of the electrode assembly 23 of the cylindrical battery cell 20 provided in some embodiments of the present application is shown. The first tab 232 has a sixth surface 2321 facing the first current collecting member 28 in the thickness direction X of the wall portion, and the current collecting main body region 281 abuts against the sixth surface 2321, and the sixth surface 2321 is provided with a recessed portion 2322 recessed in the thickness direction X of the wall portion away from the electrode terminal 22. At least part of the terminal connection region 282 is located within the recessed portion 2322 in the thickness direction X of the wall portion. That is, at least part of the terminal connection region 282 is accommodated within the recessed portion 2322 in the thickness direction X of the wall portion.

[0335] It should be noted that the terminal connection region 282 can be configured such that the entire terminal connection region 282 is located within the recessed portion 2322 in the thickness direction X of the wall portion, or can be configured such that only part of the terminal connection region 282 is located within the recessed portion 2322.

[0336] Optionally, the recessed portion 2322 can be a groove structure or a hole structure provided on the sixth surface 2321 of the first tab 232.

[0337] In the present embodiment, by configuring at least part of the terminal connection region 282 to be accommodated within the recessed portion 2322 of the first tab 232 in the thickness direction X of the wall portion, at least part of the terminal connection region 282 is configured to be located within the recessed portion 2322. The cylindrical battery cell 20 configured in this way can not only achieve the avoidance of the first tab 232 from the terminal connection region 282, but also can achieve the sharing of part of the space in the thickness direction X of the wall portion by the terminal connection region 282 and the first tab 232, so as to improve the utilization of the internal space of the cylindrical battery cell 20.

[0338] Of course, the structure of the cylindrical battery cell 20 is not limited to this, and in some embodiments, the cylindrical battery cell 20 can also have other structures, for example, along the thickness direction X of the wall portion, the current collection body area 281 has a third surface 2811 facing away from the body portion 231, and the third surface 2811 is closer to the body portion 231 than the first surface 2821. That is, the terminal connection area 282 is a structure that is bent in the thickness direction X of the wall portion to the direction closer to the wall portion 211 than the current collection body area 281.

[0339] In the present embodiment, by setting the third surface 2811 of the current collection body area 281 facing away from the body portion 231 to be closer to the body portion 231 than the first surface 2821 of the terminal connection area 282 facing away from the body portion 231 in the thickness direction X of the wall portion, the first surface 2821 of the terminal connection area 282 can be closer to the connecting surface 223 of the electrode terminal 22 than the third surface 2811 of the current collection body area 281 in the thickness direction X of the wall portion. On the one hand, it is convenient for the first surface 2821 of the terminal connection area 282 to be welded to the connecting surface 223 of the electrode terminal 22, and can better absorb the assembly error between the electrode terminal 22 and the terminal connection area 282, which is beneficial to improve the assembly quality between the electrode terminal 22 and the terminal connection area 282. On the other hand, it can make the electrode terminal 22 better press the terminal connection area 282 in the thickness direction X of the wall portion to the direction closer to the body portion 231, which is beneficial to reduce the assembly gap between the first surface 2821 of the terminal connection area 282 and the connecting surface 223 of the electrode terminal 22, so as to improve the welding quality between the terminal connection area 282 and the electrode terminal 22.

[0340] Optionally, along the thickness direction X of the wall portion, the first insulating portion 251 has a second surface 2512 facing the first tab 232, and the second surface 2512 is closer to the body portion 231 than the connecting surface 223. That is, in the embodiment in which the terminal connection area 282 is bent in the thickness direction X of the wall portion to the direction closer to the wall portion 211 than the current collection body area 281, the end of the electrode terminal 22 closer to the body portion 231 in the thickness direction X of the wall portion does not protrude out of the through hole 2511 from the side of the first insulating portion 251 facing the first tab 232.

[0341] In the present embodiment, by setting the second surface 2512 of the first insulating portion 251 facing the first tab 232 to be closer to the body portion 231 than the connecting surface 223 of the electrode terminal 22 in the thickness direction X of the wall portion, the end of the electrode terminal 22 closer to the body portion 231 in the thickness direction X of the wall portion is configured to be located within the through hole 2511 and not extend out of the side of the first insulating portion 251 facing the first tab 232, thereby reducing the phenomenon of the electrode terminal 22 occupying the space of the side of the first insulating portion 251 facing the first tab 232, and reducing the interference between the electrode terminal 22 and other components.

[0342] In such an embodiment, at least part of the terminal connecting region 282 is accommodated within the through hole 2511 in the thickness direction X of the wall portion, i.e., the terminal connecting region 282 can be configured to be inserted into the through hole 2511 of the first insulating portion 251 in the thickness direction X of the wall portion.

[0343] In the present embodiment, by setting at least part of the terminal connecting region 282 to be accommodated within the through hole 2511 in the thickness direction X of the wall portion, the terminal connecting region 282 can share part of the space with the first insulating portion 251 in the thickness direction X of the wall portion, which is conducive to improving the internal space utilization rate of the cylindrical battery cell 20.

[0344] According to some embodiments of the present application, referring to Figure 5 and Figure 6 and Figure 10 and Figure 11 at least part of the elastic region 283 is deformed and bent.

[0345] Exemplarily, the partial deformation bending of the elastic region 283 is such that the third surface 2811 is further away from the body portion 231 than the first surface 2821 in the thickness direction X of the wall portion, that is, the electrode terminal 22 is configured to press the terminal connecting region 282 in a direction closer to the body portion 231 along the thickness direction X of the wall portion, so that the elastic region 283 is configured to deform and bend in a direction away from the body portion 231 along the thickness direction X of the wall portion, so that the first surface 2821 of the terminal connecting region 282 is closer to the body portion 231 than the third surface 2811 of the current collecting body region 281 in the thickness direction X of the wall portion, so that the terminal connecting region 282 and the current collecting body region 281 have a height difference in the thickness direction X of the wall portion, and so that the electrode terminal 22 and the current collecting body region 281 share a part of the space in the thickness direction X of the wall portion. In the embodiment in which the current collecting body region 281 is configured as an annular structure surrounding the terminal connecting region 282, an inner circumferential hole is formed on the inner side of the current collecting body region 281, and correspondingly, a part of the electrode terminal 22 is arranged in the inner circumferential hole along the thickness direction X of the wall portion. Of course, in the embodiment in which the third surface 2811 is closer to the body portion 231 than the first surface 2821 in the thickness direction X of the wall portion, the elastic region 283 is configured to deform and bend in a direction closer to the body portion 231 along the thickness direction X of the wall portion.

[0346] In the embodiment, by configuring the elastic region 283 as at least partially deformed and bent, the electrode terminal 22 is configured to press the terminal connecting region 282, and the elastic region 283 is configured to accumulate elastic force, so that the elastic region 283 is configured to press the first surface 2821 of the terminal connecting region 282 against the connecting surface 223 of the electrode terminal 22 along the thickness direction X of the wall portion, so that the assembly gap between the first surface 2821 of the terminal connecting region 282 and the connecting surface 223 of the electrode terminal 22 is further reduced, and the welding quality between the terminal connecting region 282 and the electrode terminal 22 is further improved.

[0347] According to some embodiments of the present application, as shown in Figure 6 , Figure 12 and Figure 13 , along the thickness direction X of the wall portion, the first tab 232 has a sixth surface 2321 facing the wall portion 211, and the current collecting body region 281 abuts against the sixth surface 2321. The sixth surface 2321 is provided with a recessed portion 2322 recessed in a direction away from the electrode terminal 22 in the thickness direction X of the wall portion, and the projection of the terminal connecting region 282 in the thickness direction X of the wall portion is located in the recessed portion 2322.

[0348] The sixth surface 2321 is the surface of the first tab 232 on the side away from the body portion 231 in the thickness direction X of the wall portion, and the sixth surface 2321 abuts against the current collecting body region 281 of the first current collecting member 28 in the thickness direction X of the wall portion.

[0349] The sixth surface 2321 is provided with a recessed portion 2322 recessed in the thickness direction X of the wall portion away from the electrode terminal 22, and a projection of the terminal connection region 282 in the thickness direction X of the wall portion is located within the recessed portion 2322, that is, the sixth surface 2321 is provided with a recessed structure for avoiding the terminal connection region 282 at a position corresponding to the terminal connection region 282 in the thickness direction X of the wall portion, and the projection of the terminal connection region 282 in the thickness direction X of the wall portion is located within the recessed portion 2322.

[0350] Optionally, the structure of the recessed portion 2322 provided on the sixth surface 2321 can be various, for example, the recessed portion 2322 can be a groove structure provided on the sixth surface 2321, or a hole structure provided on the sixth surface 2321 and penetrating the first tab 232 along the thickness direction X of the wall portion.

[0351] In the present embodiment, by providing the recessed portion 2322 on the sixth surface 2321 of the first tab 232 facing the wall portion 211 and abutting against the current collection main body region 281, and setting the projection of the terminal connection region 282 in the thickness direction X of the wall portion within the recessed portion 2322, the terminal connection region 282 is provided in a structure corresponding to the recessed portion 2322 of the first tab 232 in the thickness direction X of the wall portion, so that the terminal connection region 282 can be inserted into the recessed portion 2322 when approaching or moving away from the current collection main body region 281 in the thickness direction X of the wall portion, to achieve the avoidance of the terminal connection region 282 by the first tab 232. On the one hand, it can reduce the blocking and interference of the first tab 232 to the terminal connection region 282, and is beneficial to expand the movement range of the terminal connection region 282 relative to the current collection main body region 281 in the thickness direction X of the wall portion, so as to further improve the deformation degree of the elastic region 283 in the thickness direction X of the wall portion. On the other hand, it can alleviate the phenomenon that the terminal connection region 282 presses down the first tab 232 during use or assembly, and is beneficial to reduce the damage of the first tab 232, and can reduce the risk of short circuit caused by the first tab 232 being inserted into the main body portion 231.

[0352] In some embodiments, as shown in Figure 6 , Figure 12 and Figure 13 , at least part of the terminal connection region 282 is located within the recessed portion 2322 in the thickness direction X of the wall portion. That is, at least part of the terminal connection region 282 is inserted into the recessed portion 2322 in the thickness direction X of the wall portion.

[0353] Optionally, the terminal connection region 282 can be entirely located within the recessed portion 2322 in the thickness direction X of the wall portion, or only partially located within the recessed portion 2322.

[0354] In the present embodiment, by setting at least part of the terminal connecting area 282 in the thickness direction X of the wall portion to be located within the avoiding portion 2322, at least part of the terminal connecting area 282 is arranged within the avoiding portion 2322. The cylindrical battery cell 20 adopting such a structure can not only achieve the avoiding of the first tab 232 by the terminal connecting area 282, but also achieve the sharing of part of the space in the thickness direction X of the wall portion by the terminal connecting area 282 and the first tab 232, which is conducive to improving the internal space utilization of the cylindrical battery cell 20.

[0355] According to some embodiments of the present application, as shown in Figure 6 , Figure 12 and Figure 13 , at least part of the projection of the elastic area 283 in the thickness direction X of the wall portion is located within the avoiding portion 2322. That is, at least part of the elastic area 283 is arranged in the thickness direction X of the wall portion to correspond to the avoiding portion 2322.

[0356] Optionally, the elastic area 283 can be that the entire projection in the thickness direction X of the wall portion is located within the avoiding portion 2322, or that only part of the projection in the thickness direction X of the wall portion is located within the avoiding portion 2322.

[0357] In the present embodiment, by setting at least part of the projection of the elastic area 283 in the thickness direction X of the wall portion to be located within the avoiding portion 2322, the elastic area 283 is arranged at least in part to correspond to the avoiding portion 2322 of the first tab 232 in the thickness direction X of the wall portion. This allows the first tab 232 to avoid at least part of the elastic area 283 when the elastic area 283 deforms in the thickness direction X of the wall portion, which on the one hand can reduce the blocking and interference of the first tab 232 to the elastic area 283, and is conducive to expanding the deformation range of the elastic area 283, and on the other hand can alleviate the phenomenon of the elastic area 283 pressing down the first tab 232 during use or assembly, which is conducive to reducing the phenomenon of damage to the first tab 232, and can reduce the risk of short circuit caused by the first tab 232 being inserted into the main body portion 231 upside down.

[0358] In some embodiments, as shown in Figure 6 and Figure 13As shown, the avoidance portion 2322 is formed with an avoidance opening 2322a on the sixth surface 2321, and includes a first peripheral surface 2322b disposed around the avoidance opening 2322a. In the thickness direction X of the wall portion, one end of the first peripheral surface 2322b connected to the sixth surface 2321 forms the avoidance opening 2322a. The first peripheral surface 2322b is disposed inclined in a direction approaching the central axis of the cylindrical battery cell 20 from the avoidance opening 2322a, and the projection of the other end of the first peripheral surface 2322b away from the avoidance opening 2322a in the thickness direction X of the wall portion is located within the avoidance opening 2322a. In the projection plane perpendicular to the thickness direction X of the wall portion, at least part of the orthographic projection of the elastic region 283 overlaps the orthographic projection of the first peripheral surface 2322b.

[0359] The avoidance opening 2322a is an open structure formed by the avoidance portion 2322 penetrating the sixth surface 2321 and on the sixth surface 2321. In the thickness direction X of the wall portion, one end of the first peripheral surface 2322b connected to the sixth surface 2321 forms the avoidance opening 2322a, that is, the first peripheral surface 2322b extends to the sixth surface 2321 at the end approaching the wall portion 211 in the thickness direction X of the wall portion and forms the avoidance opening 2322a.

[0360] The first peripheral surface 2322b is disposed inclined in a direction approaching the central axis of the cylindrical battery cell 20 from the avoidance opening 2322a, and the projection of the other end of the first peripheral surface 2322b away from the avoidance opening 2322a in the thickness direction X of the wall portion is located within the avoidance opening 2322a. That is, the first peripheral surface 2322b is a structure in which the diameter at the end approaching the wall portion 211 in the thickness direction X of the wall portion is large and the diameter at the end away from the wall portion 211 is small, so that the first peripheral surface 2322b is a structure gradually outward and inclined in a direction away from the central axis of the cylindrical battery cell 20 from the end away from the wall portion 211 to the end approaching the wall portion 211.

[0361] In the projection plane perpendicular to the thickness direction X of the wall portion, at least part of the orthographic projection of the elastic region 283 overlaps the orthographic projection of the first peripheral surface 2322b, that is, at least part of the projection of the elastic region 283 in the thickness direction X of the wall portion is located in the first peripheral surface 2322b, so that at least part of the elastic region 283 is disposed corresponding to the first peripheral surface 2322b in the thickness direction X of the wall portion.

[0362] In the present embodiment, the first peripheral surface 2322b of the avoiding portion 2322 is connected to one end of the sixth surface 2321, and the avoiding portion 2322 is formed with an avoiding opening 2322a. The first peripheral surface 2322b is arranged to be inclined from the avoiding opening 2322a towards the center axis of the cylindrical battery cell 20. The first peripheral surface 2322b is an inclined surface with one end close to the sixth surface 2321 and the other end away from the sixth surface 2321 in the thickness direction X of the wall portion. The first peripheral surface 2322b is arranged to at least partially overlap with the normal projection of the elastic region 283 in the projection plane perpendicular to the thickness direction X of the wall portion. The first peripheral surface 2322b is arranged to correspond to the elastic region 283 in the thickness direction X of the wall portion. The avoiding portion 2322 can conform to the deformation of the elastic region 283, so that the avoiding portion 2322 avoids the elastic region 283. The avoiding range of the avoiding portion 2322 to the elastic region 283 can be further expanded without excessively reducing the first tab 232. The overcurrent requirement of the first tab 232 can be met, and the avoiding effect of the avoiding portion 2322 to the elastic region 283 can be further improved.

[0363] In some embodiments, referring to Figure 13 The first peripheral surface 2322b is a conical surface.

[0364] In the present embodiment, the first peripheral surface 2322b is arranged as a conical surface. The regularity of the first peripheral surface 2322b is improved, and the avoiding effect of the avoiding portion 2322 to the elastic region 283 is further improved. The processing and forming difficulty of the first peripheral surface 2322b is reduced, and the manufacturing difficulty of the cylindrical battery cell 20 is reduced.

[0365] According to some embodiments of the present application, referring to Figure 6 and Figure 13 The electrode assembly 23 has a center through hole 234, which penetrates both ends of the electrode assembly 23 in the thickness direction X of the wall portion. The avoiding portion 2322 is part of the center through hole 234.

[0366] The center through hole 234 is an internal passage of the electrode assembly 23 for gas flow inside the cylindrical battery cell 20. The center through hole 234 penetrates both ends of the electrode assembly 23 in the thickness direction X of the wall portion, i.e. the center through hole 234 penetrates the first tab 232, the main body 231 and the second tab 233 in the thickness direction X of the wall portion.

[0367] The avoiding portion 2322 is part of the center through hole 234, i.e. the center through hole 234 penetrates at least part of the first tab 232, which is the avoiding portion 2322 of the first tab 232 for avoiding the terminal connection region 282.

[0368] In the embodiment, the electrode assembly 23 is provided with a center through hole 234 penetrating through both ends of the electrode assembly 23 along the thickness direction X of the wall portion, by setting part of the center through hole 234 as an avoiding portion 2322 for avoiding the terminal connecting area 282, so that the avoiding portion 2322 can cooperate with the center through hole 234 to exhaust while avoiding the terminal connecting area 282, which is conducive to improving the internal exhaust smoothness of the cylindrical battery monomer 20, and can reduce the manufacturing difficulty of the electrode assembly 23.

[0369] In some embodiments, referring to Figure 13 , the center through hole 234 includes a first hole section 2341 and a second hole section 2342 that are in communication with each other, at least part of the first hole section 2341 is located in the main body portion 231, and the second hole section 2342 is located in the first tab 232, the second hole section 2342 is the avoiding portion 2322, and the minimum hole diameter of the second hole section 2342 is greater than the hole diameter of the first hole section 2341.

[0370] Among them, the minimum hole diameter of the second hole section 2342 is greater than the hole diameter of the first hole section 2341, that is, the projection of the first hole section 2341 in the thickness direction X of the wall portion is located in the second hole section 2342.

[0371] Exemplarily, in Figure 13 , the first hole section 2341 is a hole structure with equal diameters, part of the first hole section 2341 is located in the coated area of the main body portion 231 where the positive electrode sheet and the negative electrode sheet are coated with active material layers, if the first tab 232 is a positive electrode tab, and in the embodiment where the positive transition area is provided in the positive electrode blank area of the positive electrode sheet, part of the first hole section 2341 is also located in the blank area of the main body portion 231 where the positive electrode sheet is not coated with active material layers, if the first tab 232 is a negative electrode tab, and in the embodiment where the negative transition area is provided in the negative electrode blank area of the negative electrode sheet, part of the first hole section 2341 is also located in the blank area of the main body portion 231 where the negative electrode sheet is not coated with active material layers, it should be noted that in the embodiment where the separator of the main body portion 231 extends to the first tab 232 along the thickness direction X of the wall portion, the first hole section 2341 can also be a structure partially located in the first tab 232, correspondingly, the second hole section 2342 is a structure with a hole diameter greater than that of the first hole section 2341, similarly, the second hole section 2342 can also be a hole structure with equal diameters, or a stepped hole structure, exemplarily, referring to Figure 13 , in the embodiment where the hole wall surface of the second hole section 2342 forms a first peripheral surface 2322b arranged obliquely, the second hole section 2342 is a structure including two hole sections connected to each other, one hole section is a hole structure with equal diameters, and the other hole section is a hole structure with a gradually increasing hole diameter.

[0372] In this embodiment, by setting the second hole segment 2342 located within the first electrode tab 232 as a clearance portion 2322, and setting the hole diameter of the second hole segment 2342 to be larger than that of the first hole segment 2341, the effect of the second hole segment 2342 as a clearance portion 2322 in avoiding the terminal connection area 282 is improved, while also alleviating the phenomenon of the first hole segment 2341 occupying too much space within the main body 231, thereby helping to improve the energy density of the electrode assembly 23.

[0373] It should be noted that the structure of the electrode assembly 23 is not limited to this. In some embodiments, the electrode assembly 23 can also have other structures. For example, the diameter of the first hole segment 2341 is equal to the diameter of the second hole segment 2342. That is, the first hole segment 2341 and the second hole segment 2342 are both hole structures with the same diameter. In other words, in the projection plane perpendicular to the thickness direction X of the wall, the orthographic projection of the hole wall surface of the first hole segment 2341 and the orthographic projection of the hole wall surface of the second hole segment 2342 completely overlap.

[0374] In this embodiment, by setting the diameter of the first hole segment 2341 and the diameter of the second hole segment 2342 of the central through hole 234 to be equal, the processing difficulty of the central through hole 234 can be reduced while the second hole segment 2342 acts as a clearance part 2322 to avoid the terminal connection area 282, thereby reducing the manufacturing difficulty of the electrode assembly 23.

[0375] According to some embodiments of this application, see Figure 12 As shown, the terminal connection area 282 is connected to the current collector body area 281 only through a single elastic area 283. That is, there is only one elastic area 283 connecting a terminal connection area 282 and a current collector body area 281.

[0376] In this embodiment, by setting the terminal connection area 282 to be connected to the current collection body area 281 through only one elastic area 283, the elastic area 283 can be better deformed when the terminal connection area 282 and the current collection body area 281 move closer or further away from each other along the thickness direction X of the wall, which is beneficial to further expand the range of movement of the terminal connection area 282 relative to the current collection body area 281 in the thickness direction X of the wall.

[0377] Of course, the structure of the first current collecting member 28 is not limited to this, and in some embodiments, the first current collecting member 28 can also be other structures, for example, the first current collecting member 28 includes a plurality of elastic regions 283, and the terminal connecting regions 282 are connected to the current collecting body region 281 through the plurality of elastic regions 283. That is, a plurality of elastic regions 283 are connected between one terminal connecting region 282 and one current collecting body region 281, and it should be noted that in the embodiment in which the current collecting body region 281 is in the form of a ring structure surrounding the terminal connecting region 282, the plurality of elastic regions 283 can also be in the form of an asymmetric structure arranged along the circumference of the current collecting body region 281.

[0378] In this embodiment, by arranging the terminal connecting region 282 in the form of a structure connected to the current collecting body region 281 through the plurality of elastic regions 283, the connection reliability between the terminal connecting region 282 and the current collecting body region 281 can be improved, and the flow area between the terminal connecting region 282 and the current collecting body region 281 can be further improved.

[0379] According to some embodiments of the present application, please continue to refer to Figure 12 As shown in the figure, the current collecting body region 281, the elastic region 283 and the terminal connecting region 282 are integrally formed. That is, the current collecting body region 281, the elastic region 283 and the terminal connecting region 282 of the first current collecting member 28 are structures made by an integral forming process, such as stamping, casting or milling, etc.

[0380] Of course, the current collecting body region 281, the elastic region 283 and the terminal connecting region 282 of the first current collecting member 28 can also be a structure arranged separately, for example, the current collecting body region 281 is welded to the elastic region 283, and the elastic region 283 is welded to the terminal connecting region 282.

[0381] In this embodiment, by arranging the current collecting body region 281, the elastic region 283 and the terminal connecting region 282 of the first current collecting member 28 in the form of an integral structure, on the one hand, the connection difficulty of the elastic region 283 connected between the current collecting body region 281 and the terminal connecting region 282 can be reduced, so as to reduce the processing difficulty of the first current collecting member 28, and on the other hand, the connection reliability and stability between the current collecting body region 281, the elastic region 283 and the terminal connecting region 282 can be improved, which is beneficial to alleviate the phenomenon of fracture between the current collecting body region 281 and the elastic region 283 and between the elastic region 283 and the terminal connecting region 282 during use, so as to reduce the risk of connection failure between the electrode terminal 22 and the electrode assembly 23.

[0382] According to some embodiments of the present application, the Vickers hardness of the elastic region 283 is greater than or equal to 10 and less than or equal to 70.

[0383] Exemplarily, the Vickers hardness of the elastic region 283 can be 10, 11, 12, 13, 14, 15, 16, 18, 20, 22, 25, 28, 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60, 61, 62, 63, 64, 65, 67, 68, 69, or 70, etc.

[0384] In the present embodiment, by setting the Vickers hardness of the elastic region 283 to be 10 to 70, the elastic region 283 has better structural strength while also being able to have better deformation capacity, so that the elastic region 283 can better play a buffering role between the current collection main body region 281 and the terminal connecting region 282, while also being able to better support the terminal connecting region 282, so as to alleviate the phenomenon that the terminal connecting region 282 cannot be in effective contact with the electrode terminal 22 and thus causes assembly failure.

[0385] According to some embodiments of the present application, the material of the elastic region 283 includes aluminum.

[0386] Exemplarily, the overall material of the first current collection member 28 is aluminum, and the material of the first tab 232 is aluminum, so that the tab connecting region 284 of the first current collection member 28 and the first tab 232 are of the same material and are welded in a structure, which is conducive to reducing the welding difficulty.

[0387] In the present embodiment, the elastic region 283 made of aluminum material can make the elastic region 283 have better current guiding capacity while also being able to have better deformation capacity.

[0388] According to some embodiments of the present application, reference is made to Figure 12 , and further reference is made to Figure 14 and Figure 15 , Figure 14 a sectional view of the elastic region 283 of the first current collection member 28 provided by some embodiments of the present application is perpendicular to the extension direction thereof, Figure 15 a front view of the first current collection member 28 provided by some embodiments of the present application in the thickness direction X of the wall portion. The elastic region 283 is connected to the current collection main body region 281 and the terminal connecting region 282 at opposite ends thereof in the extension direction thereof, and the area of the cross section of the elastic region 283 perpendicular to the extension direction thereof is S, which satisfies 0.2mm 2 ≤S≤8mm 2 .

[0389] Among them, the area S of the cross section of the elastic region 283 perpendicular to the extension direction thereof can be 2mm 2 , 2.1mm 2 , 2.3mm 2 , 2.5mm 2 , 2.8mm2 3mm 2 3.2mm 2 3.5mm 2 3.8mm 2 4mm 2 4.2mm 2 4.5mm 2 4.8mm 2 5mm 2 5.2mm 2 5.5mm 2 5.8mm 2 6mm 2 6.2mm 2 6.5mm 2 6.8mm 2 7mm 2 7.2mm 2 7.5mm 2 7.8mm 2 7.9mm 2 or 8mm 2 wait.

[0390] In this embodiment, the area of ​​the cross-section of the elastic region 283 perpendicular to its extending direction is 0.2 mm. 2 up to 8mm 2 On the one hand, the area of ​​the cross-section of the elastic zone 283 perpendicular to its extension direction is set to be greater than or equal to 0.2 mm. 2 This increases the flow area of ​​the elastic zone 283, thereby improving the flow capacity of the first current collector 28. On the other hand, the cross-sectional area of ​​the elastic zone 283 perpendicular to its extension direction is set to be less than or equal to 8 mm². 2 This allows the elastic zone 283 to deform better between the current collector area 281 and the terminal connection area 282, which is beneficial to improving the deformation capability of the elastic zone 283.

[0391] In some embodiments, see Figure 14 and Figure 15 As shown, the cross-section is rectangular, with length and width L and W respectively, satisfying 1mm≤L≤10mm and 0.2mm≤W≤0.8mm.

[0392] Wherein, the width direction of the cross-section of the elastic region 283 perpendicular to its extension direction is the thickness direction X of the wall. For example, the orthographic projection of the elastic region 283 in the projection plane perpendicular to the thickness direction X of the wall is a structure extending radially along the cylindrical battery cell 20. Correspondingly, the length direction of the cross-section of the elastic region 283 perpendicular to its extension direction is perpendicular to the radial direction of the cylindrical battery cell 20.

[0393] Exemplarily, the length L of the cross section of the elastic region 283 perpendicular to the extending direction thereof can be 1 mm, 1.1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm, etc.

[0394] Exemplarily, the width W of the cross section of the elastic region 283 perpendicular to the extending direction thereof can be 0.2 mm, 0.21 mm, 0.22 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.78 mm, 0.79 mm, or 0.8 mm, etc.

[0395] In the present embodiment, by setting the length of the cross section of the elastic region 283 perpendicular to the extending direction thereof to be 1 mm to 10 mm, and setting the width of the cross section of the elastic region 283 perpendicular to the extending direction thereof to be 0.2 mm to 0.8 mm, the elastic region 283 is in a flat structure, and the elastic region 283 adopting such structure can improve the deformation capability of the elastic region 283 while meeting the overcurrent requirement of the elastic region 283, and can reduce the processing difficulty of the elastic region 283 and reduce the space occupied by the elastic region 283.

[0396] According to some embodiments of the present application, referring to Figs. 1 and 2, the current collecting body region 281 is in a ring structure surrounding the terminal connecting region 282, the terminal connecting region 282 is spaced apart from the current collecting body region 281, and the elastic region 283 is connected to the outer circumferential surface of the terminal connecting region 282 and the inner circumferential surface of the current collecting body region 281 at opposite ends thereof in the extending direction thereof. Figure 12 and Figure 15 The current collecting body region 281 is in a ring structure surrounding the terminal connecting region 282, the terminal connecting region 282 is spaced apart from the current collecting body region 281, and the elastic region 283 is connected to the outer circumferential surface of the terminal connecting region 282 and the inner circumferential surface of the current collecting body region 281 at opposite ends thereof in the extending direction thereof.

[0397] The current collecting body region 281 is in a ring structure surrounding the terminal connecting region 282, the terminal connecting region 282 is spaced apart from the current collecting body region 281, and the elastic region 283 is connected to the outer circumferential surface of the terminal connecting region 282 and the inner circumferential surface of the current collecting body region 281 at opposite ends thereof in the extending direction thereof.

[0398] In the embodiment, by setting the current collection main body area 281 as a ring structure surrounding the outer side of the terminal connecting area 282, and connecting the opposite ends of the elastic area 283 in the extension direction thereof to the outer peripheral surface of the terminal connecting area 282 and the inner peripheral surface of the current collection main body area 281 respectively, the elastic area 283 is connected between the terminal connecting area 282 and the current collection main body area 281. The first current collection member 28 with such a structure can facilitate the deformation of the elastic area 283, and facilitate the assembly connection of the terminal connecting area 282 and the electrode terminal 22, which is conducive to reducing the connection difficulty between the terminal connecting area 282 and the electrode terminal 22. On the other hand, the structure layout of the current collection main body area 281, the elastic area 283 and the terminal connecting area 282 can be optimized, so as to facilitate the assembly of the current collection main body area 281 of the first current collection member 28 between the first insulating part 251 and the first tab 232, and improve the structural stability of the current collection main body area 281 of the first current collection member 28 arranged between the first insulating part 251 and the first tab 232.

[0399] In some embodiments, referring to Figure 15 As shown in the drawings, in the projection plane perpendicular to the thickness direction X of the wall part, the orthogonal projection of the elastic area 283 extends in the radial direction of the cylindrical battery cell 20.

[0400] In the embodiment, by setting the orthogonal projection of the elastic area 283 in the projection plane perpendicular to the thickness direction X of the wall part as extending in the radial direction of the cylindrical battery cell 20, the elastic area 283 is arranged as a strip structure between the current collection main body area 281 and the terminal connecting area 282 in the radial direction of the cylindrical battery cell 20. On the one hand, the deformation of the elastic area 283 can be facilitated when the current collection main body area 281 and the terminal connecting area 282 approach or move away from each other in the thickness direction X of the wall part, which is conducive to improving the buffering effect of the elastic area 283 between the current collection main body area 281 and the terminal connecting area 282, and improving the effect of the elastic area 283 absorbing the assembly error between the terminal connecting area 282 and the electrode terminal 22. On the other hand, the regularity of the shape of the first current collection member 28 can be improved, which is conducive to reducing the processing difficulty of the first current collection member 28.

[0401] According to some embodiments of the present application, referring to Figure 15 As shown in the drawings, the opposite ends of the elastic area 283 in the extension direction thereof are connected to the current collection main body area 281 and the terminal connecting area 282 respectively, and the size of the elastic area 283 in the extension direction thereof is D, the radius of the current collection main body area 281 is R, and 0.4R≤D≤0.95R is satisfied.

[0402] The size D of the elastic region 283 in the extension direction thereof is the length of the elastic region 283 in the extension direction thereof, and the radius R of the current collecting body region 281 is the radius of a circle on which the outer edge of the orthographic projection of the current collecting body region 281 in a projection plane perpendicular to the thickness direction X of the wall portion is located.

[0403] Exemplarily, the size D of the elastic region 283 in the extension direction thereof can be 0.4 times, 0.42 times, 0.45 times, 0.5 times, 0.55 times, 0.6 times, 0.65 times, 0.7 times, 0.75 times, 0.8 times, 0.85 times, 0.9 times, or 0.95 times, etc. of the radius R of the current collecting body region 281.

[0404] In the present embodiment, by setting the size D of the elastic region 283 in the extension direction thereof to be greater than or equal to 0.4 times the radius R of the current collecting body region 281, the elastic region 283 is made to have sufficient length to deform, which is conducive to improving the ability of the elastic region 283 to deform when the current collecting body region 281 and the terminal connecting region 282 approach or move away from each other along the thickness direction X of the wall portion. In addition, by setting the size D of the elastic region 283 in the extension direction thereof to be less than or equal to 0.95 times the radius R of the current collecting body region 281, the phenomenon of the elastic region 283 occupying too much space and causing the area of the terminal connecting region 282 to be too small is alleviated, which is conducive to improving the connection area between the terminal connecting region 282 and the electrode terminal 22, so as to improve the overcurrent area and connection reliability between the terminal connecting region 282 and the electrode terminal 22.

[0405] In some embodiments, please continue to refer to Figure 15 As shown, 8mm≤D≤25mm.

[0406] Exemplarily, the size D of the elastic region 283 in the extension direction thereof can be 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, or 25mm, etc.

[0407] In the embodiment, the elastic region 283 has a length sufficient to deform by setting the size of the elastic region 283 in the extension direction to be greater than or equal to 8 mm, which is advantageous to further improve the ability of the elastic region 283 to deform when the current collecting body region 281 and the terminal connecting region 282 are close to or away from each other along the thickness direction X of the wall portion, and in addition, the size of the elastic region 283 in the extension direction is set to be less than or equal to 25 mm to alleviate the phenomenon of insufficient strength of the elastic region 283 caused by the size of the elastic region 283 being too long, so that the elastic region 283 can better support the terminal connecting region 282, thereby effectively alleviating the phenomenon that the terminal connecting region 282 cannot be in effective contact with the electrode terminal 22 and thus cannot be assembled properly.

[0408] According to some embodiments of the present application, referring to Figure 12 and Figure 15 , the first current collecting member 28 can further include a base region 285, and the elastic region 283 is connected to the current collecting body region 281 through the base region 285. In a projection plane perpendicular to the thickness direction X of the wall portion, the width of the normal projection of the base region 285 on the circumferential direction of the current collecting body region 281 is greater than the width of the normal projection of the elastic region 283 on the circumferential direction of the current collecting body region 281.

[0409] It should be noted that if the base region 285 is of an equal width structure, the width of the base region 285 on the circumferential direction of the current collecting body region 281 is greater than the width of the elastic region 283 on the circumferential direction of the current collecting body region 281; if the base region 285 is of a width gradually changing structure, the minimum width of the base region 285 on the circumferential direction of the current collecting body region 281 is greater than or equal to the width of the elastic region 283 on the circumferential direction of the current collecting body region 281. Exemplarily, in Figure 12 and Figure 15 , the width of the base region 285 on the circumferential direction of the current collecting body region 281 is gradually increased from the end connected to the elastic region 283 to the end connected to the current collecting body region 281, and the width of the end of the base region 285 connected to the elastic region 283 is the minimum width of the base region 285 on the circumferential direction of the current collecting body region 281.

[0410] In the embodiment, the first current collecting member 28 further has the base region 285 connected between the elastic region 283 and the current collecting body region 281, and the width of the base region 285 on the circumferential direction of the current collecting body region 281 is greater than the width of the elastic region 283 on the circumferential direction of the current collecting body region 281, so that the elastic region 283 is connected to the current collecting body region 281 through the base region 285 with a greater width, which is advantageous to reduce the difficulty of connecting the elastic region 283 to the annular structure of the current collecting body region 281, and can improve the connection stability of the elastic region 283 connected to the inner circumferential surface of the current collecting body region 281.

[0411] In some embodiments, the binding Figure 12 and Figure 15 As shown in FIG. 28, the base region 285 has opposite first and second ends 2851 and 2852, the first end 2851 is connected with the elastic region 283, and the second end 2852 is connected with the current collection body region 281. In the projection plane perpendicular to the thickness direction X of the wall portion, the normal projection of the base region 285 on the circumferential direction of the current collection body region 281 gradually increases from the first end 2851 to the second end 2852. That is, the width of the end of the base region 285 connected with the elastic region 283 is the minimum width of the base region 285 in the circumferential direction of the current collection body region 281, and the width of the end of the base region 285 connected with the inner circumferential surface of the current collection body region 281 is the maximum width of the base region 285 in the circumferential direction of the current collection body region 281.

[0412] In the present embodiment, by setting the base region 285 to gradually increase in width in the circumferential direction of the current collection body region 281 from the first end 2851 connected with the elastic region 283 to the second end 2852 connected with the current collection body region 281, on the one hand, the width of the end of the base region 285 connected with the elastic region 283 can be reduced, which is beneficial to reduce the width difference of the connection position of the base region 285 and the elastic region 283, so as to reduce the connection difficulty and forming difficulty of the base region 285 and the elastic region 283, and to realize smoother transition of the connection position of the base region 285 and the elastic region 283, on the other hand, increasing the width of the second end 2852 of the base region 285 connected with the current collection body region 281 can expand the angle of the position where the base region 285 and the inner circumferential surface of the current collection body region 281 are connected with each other, so as to alleviate the stress concentration phenomenon of the connection position of the base region 285 and the current collection body region 281, which is beneficial to reduce the risk of damage or cracking of the connection position of the base region 285 and the current collection body region 281, so as to improve the use reliability and service life of the first current collection member 28.

[0413] According to some embodiments of the present application, as shown in Figure 12 and Figure 15 The first current collection member 28 can further include a tab connecting region 284, the tab connecting region 284 is connected with the inner circumferential surface of the current collection body region 281, and the tab connecting region 284 is connected with the first tab 232 to electrically connect the current collection body region 281 and the first tab 232.

[0414] The tab connecting region 284 is connected with the inner circumferential surface of the current collection body region 281, that is, the tab connecting region 284 is arranged on the inner circumferential side of the current collection body region 281.

[0415] It should be noted that in other embodiments, the first current collection member 28 can also not be provided with the tab connecting region 284, and correspondingly, the current collection body region 281 is directly connected with the first tab 232.

[0416] Optionally, the tab connecting region 284 is integrally formed with the current collecting body region 281, i.e., the tab connecting region 284 and the current collecting body region 281 are integrally formed by an integral forming process.

[0417] In this embodiment, the first current collecting member 28 is further provided with a tab connecting region 284 for interconnecting with the first tab 232, and the tab connecting region 284 is connected to the inner circumferential surface of the current collecting body region 281. On the one hand, this facilitates the connection of the current collecting body region 281 to the first tab 232 through the tab connecting region 284, which is conducive to reducing the connection difficulty between the first current collecting member 28 and the first tab 232, and can increase the connection area between the first current collecting member 28 and the first tab 232. On the other hand, it can optimize the structural layout between the tab connecting region 284 and the current collecting body region 281, so as to facilitate the assembly of the current collecting body region 281 of the first current collecting member 28 between the first insulating portion 251 and the first tab 232, and is conducive to improving the structural stability of the current collecting body region 281 of the first current collecting member 28 arranged between the first insulating portion 251 and the first tab 232.

[0418] In some embodiments, referring to Figure 15 , the tab connecting region 284 extends in the radial direction of the cylindrical battery cell 20.

[0419] In this embodiment, by arranging the tab connecting region 284 to extend in the radial direction of the cylindrical battery cell 20, the connection area between the tab connecting region 284 and the first tab 232 can be improved, so as to improve the connection stability between the tab connecting region 284 and the first tab 232. In addition, the first tab 232 can be connected to the tab connecting region 284 at multiple positions in the radial direction of the cylindrical battery cell 20, so that the multiple turns of the first tab 232 of the electrode assembly 23 in the cylindrical structure can be connected to the tab connecting region 284. This is conducive to improving the flow area between the first tab 232 and the tab connecting region 284, and can improve the flow balance between the electrode assembly 23 and the tab connecting region 284, so as to reduce the risk of local lithium precipitation of the electrode assembly 23 during use.

[0420] According to some embodiments of the present application, referring to Figure 12 and Figure 15 , in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the terminal connecting region 282 and the orthographic projection of the elastic region 283 do not overlap with the orthographic projection of the tab connecting region 284. That is, the projections of the terminal connecting region 282, the elastic region 283 and the tab connecting region 284 in the thickness direction X of the wall portion do not overlap with each other.

[0421] In the embodiment, by setting the projections of the terminal connecting area 282 and the elastic area 283 on the thickness direction X of the wall portion as structures not overlapping with the projection of the tab connecting area 284 on the thickness direction X of the wall portion, the tab connecting area 284 can reduce the blocking and interference of the terminal connecting area 282 and the elastic area 283 when the terminal connecting area 282 moves towards or away from the current collecting body area 281 on the thickness direction X of the wall portion, which is beneficial to expand the moving range of the terminal connecting area 282 relative to the current collecting body area 281 on the thickness direction X of the wall portion, and can improve the deformation degree of the elastic area 283 on the thickness direction X of the wall portion, thereby further improving the effect of the elastic area 283 on reducing the assembly error between the electrode terminal 22 and the terminal connecting area 282, to further improve the assembly quality between the electrode terminal 22 and the terminal connecting area 282, and further improve the buffering effect of the elastic area 283 between the current collecting body area and the terminal connecting area 282, to further reduce the risk of electrical connection failure between the electrode terminal 22 and the electrode assembly 23.

[0422] In some embodiments, please continue to refer to Figure 12 and Figure 15 As shown, the first current collecting member 28 can include a plurality of tab connecting areas 284, and the plurality of tab connecting areas 284 are arranged at intervals along the circumference of the current collecting body area 281.

[0423] For example, the first current collecting member 28 is provided with four tab connecting areas 284, and the four tab connecting areas 284 are connected to the inner circumferential surface of the current collecting body area 281 and arranged at intervals and uniformly along the circumference of the current collecting body area 281. Each tab connecting area 284 is a structure extending along the radial direction of the cylindrical battery cell 20. Of course, in other embodiments, the number of tab connecting areas 284 connected to the current collecting body area 281 can also be two, three, five, or six, etc.

[0424] In the embodiment, by connecting a plurality of tab connecting areas 284 to the current collecting body area 281, and the plurality of tab connecting areas 284 are arranged at intervals along the circumference of the current collecting body area 281, on the one hand, the connection area between the first current collecting member 28 and the first tab 232 can be further improved, and on the other hand, the first tab 232 can be connected to the tab connecting area 284 at multiple positions along the circumference of the body area, which is beneficial to improve the flow balance between the electrode assembly 23 and the first current collecting member 28, to reduce the risk of local lithium precipitation of the electrode assembly 23 during use.

[0425] According to some embodiments of the present application, please refer to Figure 6 and Figure 12As shown, the terminal connecting area 282 is welded to the electrode terminal 22 at the end of the wall portion close to the main body portion 231 in the thickness direction X. That is, the terminal connecting area 282 and the electrode terminal 22 are stacked in the thickness direction X of the wall portion and welded to each other, and correspondingly, the first surface 2821 of the terminal connecting area 282 and the connecting surface 223 of the electrode terminal 22 abut and are welded to each other.

[0426] Exemplarily, the welding manner of the terminal connecting area 282 and the electrode terminal 22 can be various, such as laser welding or ultrasonic welding.

[0427] In the embodiment, by setting the terminal connecting area 282 to be welded to the electrode terminal 22 at the end of the wall portion close to the main body portion 231 in the thickness direction X, the terminal connecting area 282 is configured to be welded to the end surface of the electrode terminal 22 at the end of the wall portion close to the main body portion 231 in the thickness direction X, which can improve the connection stability and current flow stability between the terminal connecting area 282 and the electrode terminal 22, and can absorb the assembly error between the electrode terminal 22 and the terminal connecting area 282 under the action of the elastic area 283, thereby relieving the welding gap between the terminal connecting area 282 and the electrode terminal 22, reducing the risk of false welding between the terminal connecting area 282 and the electrode terminal 22, and improving the welding quality between the terminal connecting area 282 and the electrode terminal 22.

[0428] In some embodiments, as shown in Figure 6 , Figure 12 and Figure 13 , the electrode assembly 23 has a center through hole 234 extending through both ends of the electrode assembly 23 in the thickness direction X of the wall portion. The terminal connecting area 282 is welded to the electrode terminal 22 to form a connecting portion 30, and the projection of the connecting portion 30 in the thickness direction X of the wall portion is located in the center through hole 234.

[0429] The connecting portion 30 formed by welding the terminal connecting area 282 to the electrode terminal 22 is a welding mark formed by welding the terminal connecting area 282 to the electrode terminal 22.

[0430] The projection of the connecting portion 30 in the thickness direction X of the wall portion is located in the center through hole 234, that is, in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the connecting portion 30 is located inside the orthographic projection of the hole wall surface of the center through hole 234.

[0431] In the embodiment, the connection part 30 formed by welding the terminal connecting area 282 and the electrode terminal 22 to each other is arranged such that a projection thereof in the thickness direction X of the wall part is located within the central through hole 234, so that when welding the terminal connecting area 282 and the electrode terminal 22 to each other, welding assembly can be performed from the side of the terminal connecting area 282 away from the electrode terminal 22 through the central through hole 234, which is advantageous for reducing the power required for welding the terminal connecting area 282 and the electrode terminal 22 to each other, reducing the welding difficulty between the terminal connecting area 282 and the electrode terminal 22, and improving the welding quality between the terminal connecting area 282 and the electrode terminal 22 to improve the connection reliability between the terminal connecting area 282 and the electrode terminal 22.

[0432] According to some embodiments of the present application, as shown in Figure 6 and Figure 8 , the electrode terminal 22 can include a terminal body 221 and a protruding part 222. The terminal body 221 is arranged in the mounting hole 2111 and connected with the wall part 211, the terminal body 221 extends into the through hole 2511 along the thickness direction X of the wall part, the sealing member 24 is arranged between the terminal body 221 and the wall part 211, and the terminal body 221 includes a first limiting part 2211. The protruding part 222 is connected to the terminal body 221 and protrudes from one end of the terminal body 221 facing the main body part 231 along the thickness direction X of the wall part, and the end of the protruding part 222 close to the main body part 231 is connected to the terminal connecting area 282.

[0433] , the terminal body 221 is insulated mounted on the wall part 211, and the terminal body 221 is arranged in the mounting hole 2111 of the wall part 211 along the thickness direction X of the wall part, the sealing member 24 is arranged between the terminal body 221 and the wall part 211, the sealing member 24 is configured to seal the gap between the terminal body 221 and the hole wall surface of the mounting hole 2111, and the sealing member 24 is of insulating material, so that the sealing member 24 can also insulate and isolate the terminal body 221 and the wall part 211, so as to realize the insulation mounting of the terminal body 221 on the wall part 211, that is, no electrical connection is formed between the terminal body 221 and the wall part 211.

[0434] The protruding portion 222 protrudes from one end of the terminal body 221 facing the main body portion 231, and is connected to the terminal connecting area 282 at the end of the main body portion 231, that is, the protruding portion 222 is a convex structure protruding from the one end of the terminal body 221 in the thickness direction X of the wall portion and facing the terminal connecting area 282, and the protruding portion 222 and the terminal connecting area 282 are connected to each other, for example, the protruding portion 222 and the terminal connecting area 282 are welded and connected to form the connecting portion 30, and correspondingly, in the embodiment in which the electrode terminal 22 has the connecting surface 223 connected to the terminal connecting area 282, the end surface of the protruding portion 222 in the thickness direction X of the wall portion and facing the terminal connecting area 282 is the connecting surface 223 of the electrode terminal 22.

[0435] In the embodiment, the electrode terminal 22 includes the terminal body 221 connected to the wall portion 211 and the protruding portion 222 protruding from the one end of the terminal body 221 close to the main body portion 231, the terminal body 221 is arranged in the through hole 2511 in the thickness direction X of the wall portion, and the protruding portion 222 is connected to the terminal connecting area 282 of the first current collecting member 28. The electrode terminal 22 with such a structure can reduce the connection difficulty between the electrode terminal 22 and the terminal connecting area 282, and can reduce the interference between the terminal connecting area 282 and the terminal body 221, on the other hand, the electrode terminal 22 can press down the terminal connecting area 282 along the thickness direction X of the wall portion through the protruding portion 222, which is beneficial to absorb the assembly error between the electrode terminal 22 and the terminal connecting area 282, thereby effectively improving the assembly quality between the terminal connecting area 282 and the electrode terminal 22.

[0436] In some embodiments, as shown in Figure 6 , Figure 7 and Figure 8 , the protruding portion 222 protrudes from the surface of the first insulating portion 251 facing the first current collecting member 28 in the thickness direction X of the wall portion.

[0437] In the embodiment, the terminal body 221 of the electrode terminal 22 is arranged in the through hole 2511 of the first insulating portion 251 in the thickness direction X of the wall portion, and the protruding portion 222 protrudes from the surface of the first insulating portion 251 facing the first current collecting member 28, that is, the protruding portion 222 is a structure extending out of the one end of the through hole 2511 away from the wall portion 211 in the thickness direction X of the wall portion, so that the surface of the protruding portion 222 facing the terminal connecting area 282 in the thickness direction X of the wall portion is farther away from the wall portion 211 than the surface of the first insulating portion 251 facing the first current collecting member 28.

[0438] In the present embodiment, by setting the protruding portion 222 to protrude from the surface of the first insulating portion 251 facing the first current collecting member 28 in the thickness direction X of the wall portion, the blocking and interference of the first insulating portion 251 to the protruding portion 222 can be reduced, so as to facilitate the mutual connection of the protruding portion 222 and the terminal connecting area 282, and the connection difficulty between the protruding portion 222 and the terminal connecting area 282 can be reduced.

[0439] According to some embodiments of the present application, reference is made to Figure 12 and Figure 15 , and further reference is made to Figure 16 and Figure 17 , Figure 16 a cross-sectional view of a cylindrical battery cell 20 provided for further embodiments of the present application, Figure 17 as shown in Figure 16 , a partial enlarged view of position C of the cylindrical battery cell 20. The first current collecting member 28 is formed with a hollow area 286, and along the thickness direction X of the wall portion, the wall portion 211 has a bare area 2112 corresponding to the first gap 27 in the thickness direction X of the wall portion, and the projected part of the bare area 2112 is located within the hollow area 286.

[0440] Among them, the current collecting body area 281 of the first current collecting member 28 is a ring structure arranged around the terminal connecting area 282, so that the current collecting body area 281 is surrounded by an inner circumferential hole, in combination with Figure 12 and Figure 15 as shown, in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the terminal connecting area 282, the tab connecting area 284, the elastic area 283 and the base area 285 of the first current collecting member 28 are all located within the inner circumferential hole, and the area of the inner circumferential hole not covered by the orthographic projection of the terminal connecting area 282, the tab connecting area 284, the elastic area 283 and the base area 285 is the hollow area 286 of the first current collecting member 28.

[0441] Along the thickness direction X of the wall portion, the wall portion 211 has a bare area 2112 corresponding to the first gap 27 in the thickness direction X of the wall portion, that is, the part of the wall portion 211 projected in the first gap 27 in the thickness direction X of the wall portion is the bare area 2112 of the wall portion 211.

[0442] Along the thickness direction X of the wall portion, the projected part of the bare area 2112 is located within the hollow area 286, that is, the projected part of the bare area 2112 of the wall portion 211 corresponding to the first gap 27 is located within the hollow area 286 of the first current collecting member 28, for example, see Figure 6 , Figure 11 and Figure 17As shown, in the embodiment of the present application, the projection of the exposed area 2112 of the wall portion 211 in the thickness direction X of the wall portion is located within the elastic region 283, and the other part is located within the hollow region 286 of the first current collecting member 28.

[0443] In the embodiment, by forming the hollow region 286 on the first current collecting member 28, and setting the projection of the exposed area 2112 of the wall portion 211 in the thickness direction X of the wall portion to be located within the hollow region 286 corresponding to the first gap 27, the area of the first current collecting member 28 corresponding to the first gap 27 in the thickness direction X of the wall portion is reduced, thereby reducing the risk of short circuit or electrical breakdown of the wall portion 211 and the first current collecting member 28 at the first gap 27.

[0444] In some embodiments, referring to Figure 17 As shown, in the projection plane perpendicular to the thickness direction X of the wall portion, the orthographic projection of the exposed area 2112 does not overlap with the orthographic projection of the first tab 232. That is, the orthographic projection of the exposed area 2112 of the wall portion 211 and the first tab 232 in the thickness direction X of the wall portion does not overlap.

[0445] In the embodiment, the first tab 232 is provided with a relief hole 2323 penetrating through both sides of the first tab 232 in the thickness direction X of the wall portion, and correspondingly, the projection of the exposed area 2112 of the wall portion 211 in the thickness direction X of the wall portion is located within the relief hole 2323, so as to realize that the orthographic projection of the exposed area 2112 of the wall portion 211 and the first tab 232 in the thickness direction X of the wall portion does not overlap.

[0446] It should be noted that in the embodiment in which the first tab 232 is provided with the relief portion 2322, the relief hole 2323 can also be the relief portion 2322, and correspondingly, in the embodiment in which the electrode assembly 23 is provided with the center through hole 234, and the center through hole 234 includes the first hole section 2341 located within the main body portion 231 and the second hole section 2342 located within the first tab 232, then the second hole section 2342 is the relief hole 2323.

[0447] In the embodiment, by setting the orthographic projection of the exposed area 2112 of the wall portion 211 and the first tab 232 in the thickness direction X of the wall portion to be mutually non-overlapping, the orthographic projection of the first tab 232 in the thickness direction X of the wall portion does not fall into the first gap 27, thereby effectively reducing the risk of short circuit between the first tab 232 and the wall portion 211 after the first tab 232 is inserted into the first gap 27, and reducing the risk of electrical breakdown of the first tab 232 and the wall portion 211 at the first gap 27.

[0448] In some embodiments, please continue to refer to Figure 6As shown, the electrode terminal 22 includes a terminal body 221 arranged in the mounting hole 2111, and the terminal body 221 is connected to the wall portion 211, and the terminal body 221 includes a first limiting portion 2211. The terminal body 221 extends into the through hole 2511 along the thickness direction X of the wall portion, and the sealing member 24 further includes a second sealing portion 242 located between the terminal body 221 and the hole wall surface of the mounting hole 2111 to seal the gap between the terminal body 221 and the hole wall surface of the mounting hole 2111.

[0449] In some embodiments, in combination with Figure 6 and Figure 9 As shown, the sealing member 24 includes a first sealing portion 241, a second sealing portion 242 and a third sealing portion 243 connected in sequence, the first sealing portion 241 is located between the first limiting portion 2211 and the wall portion 211, the second sealing portion 242 is located between the terminal body 221 and the hole wall surface of the mounting hole 2111, and the third sealing portion 243 is located between the second limiting portion 2212 and the wall portion 211, that is, the part of the sealing member 24 between the terminal body 221 and the hole wall surface of the through hole 2511 in the radial direction of the cylindrical battery monomer 20 is the second sealing portion 242 of the sealing member 24, and the second sealing portion 242 is configured to seal the gap between the terminal body 221 and the hole wall surface of the mounting hole 2111. And the first sealing portion 241 and the second sealing portion 242 of the sealing member 24 can further improve the effect of sealing the wall portion 211 and the electrode terminal 22 by the sealing member 24, and can improve the effect of insulating and isolating the wall portion 211 and the electrode terminal 22 by the sealing member 24.

[0450] In this embodiment, by arranging the terminal body 221 of the electrode terminal 22 in the mounting hole 2111 of the wall portion 211, and arranging the second sealing portion 242 of the sealing member 24 between the terminal body 221 and the hole wall surface of the mounting hole 2111, the sealing member 24 can seal the gap between the terminal body 221 and the hole wall surface of the mounting hole 2111, thereby further improving the effect of sealing the wall portion 211 and the electrode terminal 22 by the sealing member 24, and improving the stability and firmness of the sealing member 24 mounted between the wall portion 211 and the electrode terminal 22, which is beneficial to reduce the risk of the sealing member 24 falling off during use.

[0451] In some embodiments, in combination with Figure 6 , Figure 8 and Figure 9As shown, the terminal body 221 further comprises a second limiting portion 2212 located on the side of the wall portion 211 away from the inside of the shell 21. The first limiting portion 2211 and the second limiting portion 2212 are spaced apart along the thickness direction X of the wall portion, and at least part of the wall portion 211 is located between the first limiting portion 2211 and the second limiting portion 2212. The sealing member 24 further comprises a third sealing portion 243 located between the wall portion 211 and the second limiting portion 2212 along the thickness direction X of the wall portion, so as to seal the gap between the wall portion 211 and the second limiting portion 2212.

[0452] As shown, the first limiting portion 2211 is located on the side of the wall portion 211 facing the electrode assembly 23 along the thickness direction X of the wall portion, and the second limiting portion 2212 is located on the side of the wall portion 211 away from the electrode assembly 23 along the thickness direction X of the wall portion, so that the first limiting portion 2211 and the second limiting portion 2212 can cooperate to clamp at least part of the wall portion 211, so as to fasten the terminal body 221 to the wall portion 211.

[0453] In this embodiment, by arranging the first limiting portion 2211 and the second limiting portion 2212 on the terminal body 221 and spaced apart along the thickness direction X of the wall portion, and at least part of the wall portion 211 is located between the first limiting portion 2211 and the second limiting portion 2212, so that the first limiting portion 2211 and the second limiting portion 2212 of the terminal body 221 are respectively located on both sides of the wall portion 211 along the thickness direction X of the wall portion, so as to realize that the first limiting portion 2211 and the second limiting portion 2212 can cooperate to clamp the wall portion 211, thereby realizing the installation of the terminal body 221 of the electrode terminal 22 on the wall portion 211, which is simple in structure and convenient to realize and assemble. In addition, the sealing member 24 further comprises a third sealing portion 243 located between the second limiting portion 2212 and the wall portion 211, so that the sealing member 24 can also seal the gap between the second limiting portion 2212 and the wall portion 211, which is beneficial to further improve the sealing effect of the sealing member 24 on the wall portion 211 and the electrode terminal 22, and can improve the stability and firmness of the sealing member 24 installed between the wall portion 211 and the electrode terminal 22, which is beneficial to reduce the risk of falling of the sealing member 24 during use.

[0454] According to some embodiments of the present application, as shown in Figure 6 , Figure 11 and Figure 17 , the first insulating portion 251 is adhesively connected with the wall portion 211.

[0455] For example, the first insulating portion 251 can be adhesively connected to the surface of the wall portion 211 facing the first insulating portion 251 by means of glue, double-sided tape or hot melt glue.

[0456] In the embodiment, by setting the first insulation part 251 to be adhesively connected to the wall part 211, on the one hand, the assembly difficulty between the first insulation member 25 and the wall part 211 can be reduced, so as to reduce the assembly difficulty of the cylindrical battery cell 20, and on the other hand, the assembly stability of the first insulation member 25 arranged in the shell 21 can be improved, which is conducive to reducing the risk of movement or shaking of the first insulation member 25 during use.

[0457] According to some embodiments of the present application, as shown in Figure 4 , Figure 6 and Figure 7 , the first insulation member 25 can further include a second insulation part 252, the second insulation part 252 surrounds the first insulation part 251, and the second insulation part 252 and the first insulation part 251 jointly define a containing space 253. The first tab 232 is contained in the containing space 253 along the thickness direction X of the wall part.

[0458] The second insulation part 252 is connected to the first insulation part 251 at one end close to the wall part 211 in the thickness direction X of the wall part, so that the first insulation member 25 is a hollow structure with one end open. In the embodiment in which the first insulation part 251 is provided with a through hole 2511, the through hole 2511 and the containing space 253 are in communication with each other.

[0459] The first tab 232 is contained in the containing space 253 along the thickness direction X of the wall part, that is, the first insulation member 25 is sleeved on the end of the electrode assembly 23 provided with the first tab 232. It should be noted that in the embodiment in which the cylindrical battery cell 20 further includes a first current collecting member 28, and the first current collecting member 28 is arranged between the first tab 232 and the first insulation part 251 in the thickness direction X of the wall part, the first current collecting member 28 is contained in the containing space 253.

[0460] Exemplarily, the first insulation part 251 and the second insulation part 252 of the first insulation member 25 are integrally formed.

[0461] In the embodiment, the first insulating piece 25 is further provided with a second insulating part 252 surrounding the first insulating part 251, and the first insulating part 251 and the second insulating part 252 are jointly formed with a containing space 253 containing the first tab 232. The cylindrical battery monomer 20 with such a structure can facilitate the assembly of the first insulating piece 25. The first insulating piece 25 and the electrode assembly 23 can be assembled by inserting the end of the electrode assembly 23 provided with the first tab 232 into the containing space 253 of the first insulating piece 25, which can reduce the assembly difficulty between the first insulating piece 25 and the electrode assembly 23. On the other hand, the second insulating part 252 can further separate the first tab 232 from the shell 21, which can improve the insulation and separation effect of the first insulating piece 25 on the first tab 232 and the shell 21, thereby reducing the risk of short circuit of the cylindrical battery monomer 20 and improving the use reliability of the cylindrical battery monomer 20.

[0462] In some embodiments, in combination with Figure 6 and Figure 7 As shown, along the thickness direction X of the wall part, the main part 231 is provided with an end of the first tab 232 contained in the containing space 253. That is, the first tab 232 is entirely located in the containing space 253 formed by the first insulating piece 25 in the thickness direction X of the wall part.

[0463] In the embodiment, by setting the main part 231 provided with an end of the first tab 232 to be inserted into the containing space 253 in the thickness direction X of the wall part, the first tab 232 is entirely contained in the containing space 253, which can further improve the insulation and separation effect of the first insulating piece 25 on the first tab 232 and the shell 21, thereby further reducing the risk of short circuit of the cylindrical battery monomer 20 during use.

[0464] According to some embodiments of the present application, referring to Figure 4 and Figure 5 And further referring to Figure 18 , Figure 18A structure diagram of the second current collecting member 29 is provided for some embodiments of the present application. The electrode assembly 23 further comprises a second tab 233, which protrudes from one end of the main body 231 away from the wall portion 211 in the thickness direction X of the wall portion. The cylindrical battery cell 20 can further comprise a second current collecting member 29, which is arranged at one end of the electrode assembly 23 away from the wall portion 211 in the thickness direction X of the wall portion and connected with the second tab 233. The shell 21 further comprises a side wall 2123, which surrounds the wall portion 211, and a protrusion 2123a protruding from an inner wall surface of the side wall 2123, the main body 231 being located between the protrusion 2123a and the wall portion 211 in the thickness direction X of the wall portion, and the protrusion 2123a being connected with the second current collecting member 29 to electrically connect the electrode assembly 23 and the side wall 2123.

[0465] In the thickness direction X of the wall portion, the second tab 233 protrudes from one end of the main body 231 away from the wall portion 211, that is, the first tab 232 and the second tab 233 protrude from two ends of the main body 231 in the thickness direction X of the wall portion, and the first tab 232 is located at one end of the main body 231 facing the wall portion 211.

[0466] The main body 231 is located between the protrusion 2123a and the wall portion 211 in the thickness direction X of the wall portion, that is, the protrusion 2123a protruding from the inner wall surface of the side wall 2123 is located at one end of the main body 231 of the electrode assembly 23 provided with the second tab 233 in the thickness direction X of the wall portion.

[0467] Optionally, the connection structure between the protrusion 2123a and the second current collecting member 29 can be various, such as welding connection or abutment, etc.

[0468] In the present embodiment, the electrode assembly 23 is further provided with the second tab 233, and the cylindrical battery cell 20 is further provided with the second current collecting member 29 connected with the second tab 233, the protrusion 2123a is protruded from the side wall 2123 of the shell 21, the protrusion 2123a is located at one end of the main body 231 away from the wall portion 211 in the thickness direction X of the wall portion, and the second current collecting member 29 is connected with the protrusion 2123a to electrically connect the side wall 2123 of the shell 21 and the electrode assembly 23, so that the input or output of the electrical energy of the cylindrical battery cell 20 can be realized, the cylindrical battery cell 20 adopting such structure can reduce the electrical connection difficulty between the second current collecting member 29 and the side wall 2123, so as to reduce the assembly difficulty of the cylindrical battery cell 20. In addition, the protrusion 2123a can also play a certain limiting role for the main body 231 of the electrode assembly 23 in the thickness direction X of the wall portion, which is beneficial to reducing the movement of the electrode assembly 23 during use.

[0469] According to some embodiments of the present application, in combination withFigure 5 and Figure 18 As shown in FIG. 12, the second current collecting member 29 can include a first connecting region 291, a second connecting region 292, and a third connecting region 293. The first connecting region 291 is located at one end of the electrode assembly 23 away from the wall portion 211 in the thickness direction X of the wall portion and is connected to the second tab 233. The second connecting region 292 is connected to the protrusion 2123a. The third connecting region 293 connects the first connecting region 291 and the second connecting region 292, and is configured to be deformable when the first connecting region 291 and the second connecting region 292 approach or move away from each other in the thickness direction X of the wall portion.

[0470] The first connecting region 291 is located at one end of the electrode assembly 23 away from the wall portion 211 in the thickness direction X of the wall portion, i.e., the first connecting region 291 of the second current collecting member 29 is located at the side of the second tab 233 away from the main body portion 231 in the thickness direction X of the wall portion.

[0471] Exemplarily, the first connecting region 291 is welded to the second tab 233, and of course, in other embodiments, the first connecting region 291 and the second tab 233 can also be in abutting structure.

[0472] The third connecting region 293 is a structure connected between the first connecting region 291 and the second connecting region 292, and is configured to be deformable when the first connecting region 291 and the second connecting region 292 approach or move away from each other in the thickness direction X of the wall portion, i.e., the second current collecting member 29 is compressed or stretched in the thickness direction X of the wall portion so that the first connecting region 291 and the second connecting region 292 approach or move away from each other, and the third connecting region 293 is deformable. It should be noted that the third connecting region 293 can be elastically deformed or plastically deformed when deformed.

[0473] Optionally, in the second current collecting member 29, Figure 18 The second current collecting member 29 is provided with a plurality of second connecting regions 292 and a plurality of third connecting regions 293. The plurality of third connecting regions 293 are structures spaced apart along the circumferential direction of the side wall 2123 and are connected to the first connecting region 291. Correspondingly, the plurality of second connecting regions 292 are spaced apart along the circumferential direction of the side wall 2123, each second connecting region 292 is connected to the first connecting region 291 through one third connecting region 293, and each second connecting region 292 is connected to the protrusion 2123a.

[0474] Exemplarily, the second connecting region 292 is an arc-shaped structure extending along the circumferential direction of the side wall 2123.

[0475] Exemplarily, in the second current collecting member 29, Figure 18In the embodiment, the second current collecting member 29 is provided with four second connecting regions 292 and four third connecting regions 293, each of the second connecting regions 292 is connected with the first connecting region 291 through one of the third connecting regions 293. Of course, in other embodiments, the number of the second connecting regions 292 of the second current collecting member 29 can also be two, three, five or six, etc.

[0476] Optionally, the first connecting region 291, the second connecting region 292 and the third connecting region 293 of the second current collecting member 29 can be an integrally formed structure, or can be a structure provided separately and connected, for example, in the embodiment, the first connecting region 291, the second connecting region 292 and the third connecting region 293 of the second current collecting member 29 are provided separately and connected. Figure 18 In the embodiment, the first connecting region 291, the second connecting region 292 and the third connecting region 293 of the second current collecting member 29 are an integral structure formed by stamping and cutting, etc.

[0477] In the embodiment, the second current collecting member 29 is provided with the first connecting region 291, the second connecting region 292 and the third connecting region 293, the first connecting region 291 and the second connecting region 292 are connected with the second tab 233 and the protrusion 2123a respectively, and the third connecting region 293 is connected between the first connecting region 291 and the second connecting region 292, so as to realize the electrical connection between the second tab 233 and the side wall 2123 through the second current collecting member 29, wherein by setting the third connecting region 293 as a structure capable of deforming when the first connecting region 291 and the second connecting region 292 approach or move away from each other along the thickness direction X of the wall portion, the third connecting region 293 can play a certain buffering role between the first connecting region 291 and the second connecting region 292, so as to alleviate the rigid pulling between the first connecting region 291 and the second connecting region 292, between the first connecting region 291 and the second tab 233, and between the second connecting region 292 and the protrusion 2123a during the shaking or displacement of the electrode assembly 23, which is conducive to further reducing the risk of connection failure between the first connecting region 291 and the second tab 233, and between the second connecting region 292 and the protrusion 2123a, and is conducive to reducing the phenomenon of damage of the second current collecting member 29 caused by pulling.

[0478] According to some embodiments of the present application, referring to FIG. 6, the third connecting region 293 is bent to form a plurality of bending segments 2931, the plurality of bending segments 2931 are connected in sequence, and the bending segments 2931 at both ends of the plurality of bending segments 2931 are connected with the first connecting region 291 and the second connecting region 292 respectively. Figure 18

[0479] ​The third connecting area 293 is locally bent to form a plurality of bent segments 2931 connected in sequence, and the bent segments 2931 at both ends are connected to the first connecting area 291 and the second connecting area 292, respectively. Of course, in other embodiments, the number of bent segments 2931 formed by bending the third connecting area 293 can also be two, four, five, or six.

[0480] Exemplarily, in Figure 18 , the third connecting area 293 is locally bent to form three bent segments 2931 connected in sequence, and the bent segments 2931 at both ends are connected to the first connecting area 291 and the second connecting area 292, respectively. Of course, in other embodiments, the number of bent segments 2931 formed by bending the third connecting area 293 can also be two, four, five, or six.

[0481] In this embodiment, by setting the third connecting area 293 to be locally bent to form a plurality of bent segments 2931 connected in sequence, and the bent segments 2931 at both ends being connected to the first connecting area 291 and the second connecting area 292, respectively, the deformation ability of the third connecting area 293 when the first connecting area 291 and the second connecting area 292 move closer or farther away along the thickness direction X of the wall portion can be increased, so as to further improve the buffering effect of the third connecting area 293 between the first connecting area 291 and the second connecting area 292, thereby further reducing the phenomenon of rigid pulling between the first connecting area 291 and the second connecting area 292, between the first connecting area 291 and the second tab 233, and between the second connecting area 292 and the protrusion 2123a.

[0482] According to some embodiments of the present application, in combination with Figure 5 and Figure 18 , the second current collecting member 29 includes a second connecting area 292 connected to the protrusion 2123a, and along the thickness direction X of the wall portion, the second connecting area 292 is located on the side of the protrusion 2123a away from the wall portion 211.

[0483] Exemplarily, the second connecting area 292 of the second current collecting member 29 is located on the side of the protrusion 2123a away from the wall portion 211 in the thickness direction X of the wall portion, and the second connecting area 292 is welded to the surface of the side of the protrusion 2123a away from the wall portion 211.

[0484] It should be noted that in other embodiments, the second connecting area 292 can also be located on the side of the protrusion 2123a facing the wall portion 211 and connected to the protrusion 2123a.

[0485] In the embodiment, by arranging the second connecting area 292 of the second current collecting member 29 for interconnecting with the protrusion 2123a on the side of the protrusion 2123a away from the wall portion 211 in the thickness direction X of the wall portion, the second connecting area 292 of the second current collecting member 29 and the main body portion 231 of the electrode assembly 23 are respectively located on two sides of the protrusion 2123a in the thickness direction X of the wall portion, and the cylindrical battery cell 20 adopting the structure can reduce the interference of the main body portion 231 on the connecting position of the second connecting area 292 and the protrusion 2123a, and can reduce the blocking of the main body portion 231 to the second connecting area 292, which is conducive to reducing the connection difficulty between the second connecting area 292 and the protrusion 2123a, so as to reduce the assembly difficulty of the cylindrical battery cell 20.

[0486] According to some embodiments of the present application, the second current collecting member 29 is welded to the protrusion 2123a.

[0487] Exemplarily, the second connecting area 292 of the second current collecting member 29 is welded to the protrusion 2123a.

[0488] In the embodiment, by arranging the second current collecting member 29 and the protrusion 2123a in a welded connection structure, the connection stability and firmness between the second current collecting member 29 and the protrusion 2123a can be improved, so as to reduce the risk of connection failure of the second current collecting member 29 and the protrusion 2123a during use.

[0489] According to some embodiments of the present application, referring to Figure 5 As shown in the figure, the protrusion 2123a is an annular structure extending in the circumferential direction of the side wall 2123.

[0490] In the embodiment, by arranging the protrusion 2123a as an annular structure extending in the circumferential direction of the side wall 2123, on the one hand, the positioning effect of the protrusion 2123a on the main body portion 231 of the electrode assembly 23 can be further improved, and on the other hand, the protrusion 2123a can be interconnected with the second current collecting member 29 at any position in the circumferential direction of the side wall 2123, so as to facilitate the assembly and connection of the second current collecting member 29 and the protrusion 2123a, so that after the second current collecting member 29 is assembled into the shell 21, the assembly and connection between the second current collecting member 29 and the protrusion 2123a can be realized without rotating and adjusting the position and orientation of the second current collecting member 29, which is conducive to further reducing the connection difficulty between the second current collecting member 29 and the protrusion 2123a, thereby effectively improving the assembly efficiency of the cylindrical battery cell 20.

[0491] According to some embodiments of the present application, referring to Figure 4 and Figure 5As shown, the side wall 2123 is formed with a groove 2123b at a position corresponding to the protrusion 2123a.

[0492] It should be noted that in the embodiment in which the protrusion 2123a is an annular structure extending along the circumference of the side wall 2123, correspondingly, the groove 2123b is also an annular groove structure extending along the circumference of the side wall 2123.

[0493] In the present embodiment, by providing the groove 2123b at a position on the side of the side wall 2123 away from the electrode assembly 23 and corresponding to the protrusion 2123a, the protrusion 2123a formed on the side of the side wall 2123 facing the electrode assembly 23 is a structure that can be formed by stamping processing, so as to form the protrusion 2123a on the side of the side wall 2123 facing the electrode assembly 23 and form the groove 2123b at a position on the other side and corresponding to the protrusion 2123a. The cylindrical battery monomer 20 adopting such a structure can on the one hand reduce the difficulty of forming the protrusion 2123a on the side of the side wall 2123 facing the electrode assembly 23, and is conducive to improving the production efficiency of the cylindrical battery monomer 20, and on the other hand can realize that the inside of the protrusion 2123a is a hollow structure, so as to reduce the difficulty of mutual assembly and connection of the protrusion 2123a and the second current collecting member 29, and make the protrusion 2123a have the ability of elastic deformation, which is conducive to further relieving the rigid pulling between the second current collecting member 29 and the protrusion 2123a, so as to reduce the risk of connection failure between the second current collecting member 29 and the protrusion 2123a.

[0494] According to some embodiments of the present application, as shown in Figure 3 、 Figure 4 and Figure 5 , th...

Claims

1. A cylindrical battery cell, characterized by, The cylindrical battery cell includes: a housing having a wall portion, a thickness direction of the wall portion being an axial direction of the cylindrical battery cell, the wall portion being provided with a mounting hole, the mounting hole penetrating the wall portion in the thickness direction of the wall portion; an electrode terminal provided in the mounting hole, the electrode terminal including a first limiting portion located on a side of the wall portion facing an inside of the housing; an electrode assembly accommodated in the housing, the electrode assembly including a main body portion and a first tab, the first tab being protrudingly provided on an end of the main body portion facing the wall portion and being electrically connected to the electrode terminal; a sealing member made of an insulating material, the sealing member including a first sealing portion, the first sealing portion being located between the wall portion and the first limiting portion in the thickness direction of the wall portion, and the first sealing portion being located beyond the first limiting portion in a direction away from a central axis of the cylindrical battery cell in a radial direction of the cylindrical battery cell; a first insulating member including a first insulating portion provided between the wall portion and the first tab in the thickness direction of the wall portion, the first insulating portion being provided with a through hole, the through hole penetrating the first insulating portion in the thickness direction of the wall portion, at least a portion of the first sealing portion and the first limiting portion being located in the through hole, and a first gap being formed between the first sealing portion and a hole wall surface of the through hole in the radial direction of the cylindrical battery cell; and a second insulating member located between the wall portion and the first tab in the thickness direction of the wall portion, and a projection of the second insulating member on the thickness direction of the wall portion covering at least a portion of the first gap. The projection of the second insulating member on the thickness direction of the wall portion covers the entire first gap.

2. The cylindrical battery cell according to claim 1, characterized in that, The second insulating member is protrudingly provided on the hole wall surface of the through hole.

3. The cylindrical battery cell of claim 1, wherein, The second insulating member is integrally formed with the first insulating portion.

4. The cylindrical battery cell of claim 3, wherein, The cylindrical battery cell further includes a first current collecting member provided between the first insulating portion and the first tab, the first current collecting member connecting the electrode terminal and the first tab to electrically connect the electrode terminal and the first tab; 5. The cylindrical battery cell of claim 1, wherein, wherein, in the thickness direction of the wall portion, the second insulating member is provided between the first insulating portion and the first current collecting member. The second insulating member is connected to a surface of the first current collecting member facing the first insulating portion.

6. The cylindrical battery cell of claim 5, wherein, The second insulating member is connected to a surface of the first insulating portion facing the first current collecting member.

7. The cylindrical battery cell of claim 5, wherein, The first current collecting member includes a terminal connecting region connected to the electrode terminal; 8. The cylindrical battery cell of claim 5, wherein, wherein, in a projection plane perpendicular to the thickness direction of the wall portion, a normal projection of the terminal connecting region does not overlap a normal projection of the second insulating member. The terminal connecting region is weldedly connected to the electrode terminal to form a connecting portion, the connecting portion and the second insulating member being spaced apart in the radial direction of the cylindrical battery cell and having a spacing greater than or equal to 5 mm.

9. The cylindrical battery cell of claim 8, wherein, In the thickness direction of the wall portion, the second insulating member is provided between the first insulating portion and the wall portion.

10. The cylindrical battery cell of claim 1, wherein, The second insulating member is connected to a surface of the wall portion facing the first insulating portion.

11. The cylindrical battery cell of claim 10, wherein, ​ 12. The cylindrical battery cell of claim 10, wherein, In a projection plane perpendicular to the thickness direction of the wall portion, a projection of the second insulating member partially overlaps a projection of the first sealing portion.

13. The cylindrical battery cell of claim 5, wherein, In a projection plane perpendicular to the thickness direction of the wall portion, a projection of the second insulating member partially overlaps a projection of the first insulating portion.

14. The cylindrical battery cell according to any one of claims 1 to 13, characterized in that, The cylindrical battery cell further includes: a first current collecting member disposed between the first insulating portion and the first tab in the thickness direction of the wall portion, and connecting the electrode terminal and the first tab to electrically connect the first tab and the electrode terminal; wherein, in the thickness direction of the wall portion, the second insulating member is located between the wall portion and the first current collecting member.

15. The cylindrical battery cell of claim 14, wherein, The first current collecting member includes: a current collecting main body region disposed between the first insulating portion and the first tab at least in part in the thickness direction of the wall portion, and electrically connected to the first tab; a terminal connecting region connected to the electrode terminal; an elastic region connecting the current collecting main body region and the terminal connecting region, and configured to be deformable.

16. The cylindrical battery cell of claim 15, wherein, In a projection plane perpendicular to the thickness direction of the wall portion, a projection of the terminal connecting region and a projection of the current collecting main body region do not overlap.

17. The cylindrical battery cell of claim 15, wherein, In a projection plane perpendicular to the thickness direction of the wall portion, a projection of the elastic region and a projection of the current collecting main body region do not overlap.

18. The cylindrical battery cell of claim 15, wherein, The electrode terminal and the terminal connecting region are arranged in the thickness direction of the wall portion, and in the thickness direction of the wall portion, the terminal connecting region has a first surface facing away from the main body portion, and the electrode terminal has a connecting surface facing the main body portion, the connecting surface and the first surface being weldedly connected.

19. The cylindrical battery cell of claim 18, wherein, In the thickness direction of the wall portion, the first insulating portion has a second surface facing the first tab, and the second surface is farther away from the main body portion than the connecting surface.

20. The cylindrical battery cell of claim 19, wherein, In the thickness direction of the wall portion, the current collecting main body region has a third surface facing away from the main body portion, and the third surface is closer to the main body portion than the first surface.

21. The cylindrical battery cell of claim 20, wherein, In the thickness direction of the wall portion, the terminal connecting region has a fourth surface facing the main body portion, and the current collecting main body region has a fifth surface facing the main body portion, the fifth surface being farther away from the main body portion than the fourth surface.

22. The cylindrical battery cell of claim 20, wherein, The first tab has a sixth surface facing the first current collecting member in the thickness direction of the wall portion, the current collecting main body region abuts against the sixth surface, and the sixth surface is provided with a recessed avoiding portion recessed in a direction away from the electrode terminal in the thickness direction of the wall portion; wherein, in the thickness direction of the wall portion, at least part of the terminal connecting region is accommodated in the avoiding portion.

23. The cylindrical battery cell of claim 18, wherein, In the thickness direction of the wall portion, the current collecting main body region has a third surface facing away from the main body portion, and the third surface is closer to the main body portion than the first surface.

24. The cylindrical battery cell of claim 23, wherein, In the thickness direction of the wall portion, the first insulating portion has a second surface facing the first tab, and the second surface is closer to the main body portion than the connecting surface.

25. The cylindrical battery cell of claim 24, wherein, At least part of the terminal connecting region is accommodated in the through hole in the thickness direction of the wall portion.

26. The cylindrical battery cell of claim 20, wherein, At least part of the elastic region is deformed and bent.

27. The cylindrical battery cell of claim 15, wherein, The first tab has a sixth surface facing the wall portion in the thickness direction of the wall portion, and the current collecting body region abuts against the sixth surface; The sixth surface is provided with a recessed portion recessed in a direction away from the electrode terminal in the thickness direction of the wall portion, and a projection of the terminal connecting region in the thickness direction of the wall portion is located in the recessed portion.

28. The cylindrical battery cell of claim 27, wherein, At least part of the projection of the elastic region in the thickness direction of the wall portion is located in the recessed portion.

29. The cylindrical battery cell of claim 28, wherein, The recessed portion forms a recess on the sixth surface, and the recessed portion includes a first peripheral surface arranged around the recess, one end of the first peripheral surface connected to the sixth surface forms the recess in the thickness direction of the wall portion, and the first peripheral surface is arranged in a direction approaching the central axis of the cylindrical battery monomer from the recess; In a projection plane perpendicular to the thickness direction of the wall portion, at least part of the orthographic projection of the elastic region and the orthographic projection of the first peripheral surface overlap.

30. The cylindrical battery cell of claim 29, wherein, The first peripheral surface is a conical surface.

31. The cylindrical battery cell of claim 27, wherein, The electrode assembly has a central through hole penetrating through both ends of the electrode assembly in the thickness direction of the wall portion, and the recessed portion is part of the central through hole.

32. The cylindrical battery cell of claim 31, wherein, The central through hole includes a first hole segment and a second hole segment in communication with each other, at least part of the first hole segment is located in the body portion, the second hole segment is located in the first tab, and the second hole segment is the recessed portion; The minimum hole diameter of the second hole segment is greater than the hole diameter of the first hole segment.

33. The cylindrical battery cell of claim 15, wherein, The terminal connecting region is connected to the current collecting body region only through one elastic region.

34. The cylindrical battery cell of claim 15, wherein, The first current collecting member includes a plurality of elastic regions, and the terminal connecting region is connected to the current collecting body region through a plurality of elastic regions.

35. The cylindrical battery cell of claim 15, wherein, The current collecting body region, the elastic region, and the terminal connecting region are integrally formed.

36. The cylindrical battery cell of claim 15, wherein, The Vickers hardness of the elastic region is greater than or equal to 10 and less than or equal to 70.

37. The cylindrical battery cell of claim 15, wherein, The material of the elastic region includes aluminum.

38. The cylindrical battery cell of claim 15, wherein, The elastic region is connected to the current collecting body region and the terminal connecting region at opposite ends in the extension direction thereof, and the cross-sectional area of the elastic region perpendicular to the extension direction thereof is S, satisfying 0.2mm 2 ≤ S ≤ 8mm 2 .

39. The cylindrical battery cell of claim 38, wherein, The cross section is rectangular, the length and width of the cross section are L and W respectively, and 1mm≤L≤10mm and 0.2mm≤W≤0.8mm are satisfied.

40. The cylindrical battery cell of claim 15, wherein, The current collecting body region is an annular structure arranged around the terminal connecting region, the terminal connecting region and the current collecting body region are arranged in a spaced manner, and the opposite ends of the elastic region in the extension direction are connected to the outer peripheral surface of the terminal connecting region and the inner peripheral surface of the current collecting body region respectively.

41. The cylindrical battery cell of claim 40, wherein, In a projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the elastic region extends in the radial direction of the cylindrical battery monomer.

42. The cylindrical battery cell of claim 41, wherein, The opposite ends of the elastic region in the extension direction are connected to the current collecting body region and the terminal connecting region respectively, and the size of the elastic region in the extension direction is D, the radius of the current collecting body region is R, and 0.4R≤D≤0.95R is satisfied.

43. The cylindrical battery cell of claim 42, wherein, 8mm≤D≤25mm.

44. The cylindrical battery cell of claim 41, wherein, The first current collecting member further includes a base region, the elastic region is connected with the current collecting body region through the base region, and a width of a projection of the base region on a circumferential direction of the current collecting body region is greater than a width of a projection of the elastic region on the circumferential direction of the current collecting body region in a projection plane perpendicular to a thickness direction of the wall portion.

45. The cylindrical battery cell of claim 44, wherein, The base region has opposite first and second ends, the first end is connected with the elastic region, and the second end is connected with the current collecting body region. The width of the projection of the base region on the circumferential direction of the current collecting body region gradually increases from the first end to the second end in the projection plane perpendicular to the thickness direction of the wall portion.

46. The cylindrical battery cell of claim 40, wherein, The first current collecting member further includes: A tab connecting region is connected to an inner circumferential surface of the current collecting body region, and the tab connecting region is connected with the first tab to electrically connect the current collecting body region and the first tab.

47. The cylindrical battery cell of claim 46, wherein, The tab connecting region extends in a radial direction of the cylindrical battery cell.

48. The cylindrical battery cell of claim 46, wherein, The projection of the terminal connecting region and the projection of the elastic region do not overlap with the projection of the tab connecting region in a projection plane perpendicular to the thickness direction of the wall portion.

49. The cylindrical battery cell of claim 46, wherein, The first current collecting member includes a plurality of the tab connecting regions, and the plurality of the tab connecting regions are arranged at intervals in a circumferential direction of the current collecting body region.

50. The cylindrical battery cell of claim 15, wherein, The terminal connecting region is welded to the electrode terminal at one end of the wall portion close to the main body portion in the thickness direction of the wall portion.

51. The cylindrical battery cell of claim 50, wherein, The electrode assembly has a central through hole penetrating through both ends of the electrode assembly in the thickness direction of the wall portion. The terminal connecting region is welded to the electrode terminal and forms a connecting portion, and a projection of the connecting portion is located in the central through hole in the thickness direction of the wall portion.

52. The cylindrical battery cell of claim 15, wherein, The electrode terminal includes: A terminal body is arranged in the mounting hole and connected with the wall portion, the terminal body extends into the through hole in the thickness direction of the wall portion, the sealing member is arranged between the terminal body and the wall portion, and the terminal body includes the first limiting portion; A protruding portion is connected to the terminal body, and the protruding portion protrudes from one end of the terminal body facing the main body portion in the thickness direction of the wall portion, and one end of the protruding portion close to the main body portion is connected with the terminal connecting region.

53. The cylindrical battery cell of claim 52, wherein, The protruding portion protrudes from a surface of the first insulating portion facing the first current collecting member in the thickness direction of the wall portion.

54. The cylindrical battery cell of claim 14, wherein, The first current collecting member is formed with a hollow region, the wall portion has an exposed region arranged corresponding to the first gap in the thickness direction of the wall portion, and a part of a projection of the exposed region is located in the hollow region.

55. The cylindrical battery cell of claim 54, wherein, The projection of the exposed region does not overlap with the projection of the first tab in a projection plane perpendicular to the thickness direction of the wall portion.

56. The cylindrical battery cell of claim 1, wherein, The electrode terminal includes a terminal body arranged in the mounting hole, and the terminal body is connected with the wall portion, and the terminal body includes the first limiting portion; The terminal body extends into the through hole along the thickness direction of the wall portion, and the sealing member further comprises a second sealing portion located between the terminal body and the hole wall surface of the mounting hole to seal the gap between the terminal body and the hole wall surface of the mounting hole.

57. The cylindrical battery cell of claim 56, wherein, The terminal body further comprises a second limiting portion located on the side of the wall portion away from the inside of the shell, and the first limiting portion and the second limiting portion are spaced apart along the thickness direction of the wall portion, and at least part of the wall portion is located between the first limiting portion and the second limiting portion. The sealing member further comprises a third sealing portion located between the wall portion and the second limiting portion along the thickness direction of the wall portion to seal the gap between the wall portion and the second limiting portion.

58. The cylindrical battery cell of claim 1, wherein, The first insulating portion is adhesively connected with the wall portion.

59. The cylindrical battery cell of claim 1, wherein, The first insulating member further comprises: a second insulating portion surrounding the first insulating portion, and the second insulating portion and the first insulating portion jointly define a containing space; wherein the first tab is contained in the containing space along the thickness direction of the wall portion.

60. The cylindrical battery cell of claim 59, wherein, The main body portion is provided with one end of the first tab contained in the containing space along the thickness direction of the wall portion.

61. The cylindrical battery cell of claim 1, wherein, The electrode assembly further comprises a second tab, and the second tab is protruded from one end of the main body portion away from the wall portion along the thickness direction of the wall portion. The cylindrical battery cell further comprises a second current collecting member, and the second current collecting member is arranged at one end of the electrode assembly away from the wall portion along the thickness direction of the wall portion and connected with the second tab. The shell further comprises a side wall surrounding the wall portion, and a protrusion is protruded from the inner wall surface of the side wall, and the main body portion is located between the protrusion and the wall portion along the thickness direction of the wall portion, and the protrusion is connected with the second current collecting member to electrically connect the electrode assembly and the side wall.

62. The cylindrical battery cell of claim 61, wherein, The second current collecting member comprises: a first connecting area located at one end of the electrode assembly away from the wall portion along the thickness direction of the wall portion and connected with the second tab; a second connecting area connected with the protrusion; a third connecting area connecting the first connecting area and the second connecting area, and the third connecting area is configured to be deformable.

63. The cylindrical battery cell of claim 62, wherein, The third connecting area is bent to form a plurality of bending segments, the plurality of bending segments are connected in sequence, and the bending segments at both ends of the plurality of bending segments are respectively connected with the first connecting area and the second connecting area.

64. The cylindrical battery cell of claim 61, wherein, The second current collecting member comprises a second connecting area connected with the protrusion, and the second connecting area is located at the side of the protrusion away from the wall portion along the thickness direction of the wall portion.

65. The cylindrical battery cell of claim 61, wherein, The second current collecting member is adhesively connected with the protrusion.

66. The cylindrical battery cell of claim 61, wherein, The protrusion is an annular structure extending along the circumferential direction of the side wall.

67. The cylindrical battery cell of claim 61, wherein, The side wall is formed with a groove at the side away from the electrode assembly and corresponding to the position of the protrusion.

68. The cylindrical battery cell of claim 1, wherein, The shell comprises: A shell comprising an integrally formed side wall and a bottom wall, the side wall being disposed around the bottom wall, one end of the side wall being connected to the bottom wall and the other end of the side wall being closed to form an opening, the side wall and the bottom wall together defining a receiving cavity, the electrode assembly being received in the receiving cavity; An end cap closing the opening; The bottom wall is the wall portion.

69. The cylindrical battery cell of claim 1, wherein, The shell comprises: A shell having a receiving cavity with an opening formed therein, the electrode assembly being received in the receiving cavity; An end cap closing the opening; The end cap is the wall portion.

70. A battery device, comprising: A cylindrical battery cell comprising the cylindrical battery cell of any one of claims 1-69.

71. An electrical device, comprising: A cylindrical battery cell comprising the cylindrical battery cell of any one of claims 1-69, the cylindrical battery cell being used to provide electrical energy.

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