Battery cell, battery, and electrical device

Abstract

A battery cell (20), a battery (100), and an electrical device, relating to the technical field of batteries. The battery cell (20) comprises a casing (21), an electrode assembly (22), and a sealing member (23). An accommodating cavity (2121) is formed inside the casing (21), and the casing (21) has a first wall (211). The electrode assembly (22) is accommodated in the accommodating cavity (2121). The electrode assembly (22) comprises a main body portion (221) and a first electrode lead-out portion (222), the first electrode lead-out portion (222) is connected to the end of the main body portion (221) close to the first wall (211) in the thickness direction of the first wall (211), and the first electrode lead-out portion (222) is welded to the first wall (211) to form a first connection portion (24). The sealing member (23) is provided on the side of the first wall (211) facing away from the electrode assembly (22), the sealing member (23) is sealingly connected to the first wall (211), and the sealing member (23) covers the first connection portion (24) in the thickness direction of the first wall (211), so that the sealing member (23) can seal the area where the first wall (211) and the first electrode lead-out portion (222) are welded to each other. Thus, the first connection portion (24) is built in the battery cell (20), thereby effectively reducing the risk of airtightness failure of the battery cell (20) caused by welding defects and the like.

Description

Battery cell, battery and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell, a battery and an electric 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 usually includes a box body and a plurality of battery cells contained in the box body.

[0003] In the battery technology, the battery cell includes a shell and an electrode assembly contained in the shell. The electrode assembly is formed with a tab, and the tab is connected with the shell. The battery cell can realize the input or output of electric energy through the shell. However, the shell of the battery cell in the prior art is prone to air tightness failure, which leads to the risk of gas leakage or liquid leakage during use of the battery cell, thereby being not conducive to improving the use reliability of the battery cell.

[0004] SUMMARY

[0005] The present application provides a battery cell, a battery and an electric device, which can effectively improve the use reliability of the battery cell.

[0006] In a first aspect, the present application provides a battery cell, which includes a shell, an electrode assembly and a blocking piece. The shell has an internal accommodating cavity formed therein, and has a first wall. The electrode assembly is accommodated in the accommodating cavity. The electrode assembly includes a main body portion and a first electrode lead-out portion. The first electrode lead-out portion is connected to one end of the main body portion close to the first wall in the thickness direction of the first wall. The first electrode lead-out portion is welded to the first wall and forms a first connecting portion. The blocking piece is arranged on the side of the first wall away from the electrode assembly. The blocking piece is sealingly connected to the first wall, and covers the first connecting portion along the thickness direction of the first wall.

[0007] In the technical scheme, the sealing member is arranged on the first wall of the shell away from the electrode assembly, and the sealing member is in sealing connection with the first wall, and covers the first connecting part formed by the mutual welding connection of the first electrode lead-out part and the first wall in the thickness direction of the first wall, so that the sealing member can seal and block the area where the first wall of the shell and the first electrode lead-out part of the electrode assembly are mutually welded, the first connecting part is arranged inside the battery monomer, and the phenomenon that the battery monomer is out of gas tightness due to welding defects, welding cracks or welding melt-through of the mutual welding area of the first wall and the first electrode lead-out part can be effectively alleviated, and the risk of leakage or liquid leakage of the battery monomer in use can be effectively reduced, so that the use reliability of the battery monomer is improved.

[0008] In some embodiments, the first wall is provided with an exhaust hole in communication with the containing cavity, the exhaust hole penetrating the first wall in the thickness direction of the first wall; wherein the sealing member is configured to be able to release the internal pressure of the battery monomer.

[0009] In the technical scheme, the sealing member is arranged on the first wall of the shell away from the electrode assembly, and the sealing member is in sealing connection with the first wall, and covers the first connecting part formed by the mutual welding connection of the first electrode lead-out part and the first wall in the thickness direction of the first wall, so that the sealing member can seal and block the area where the first wall of the shell and the first electrode lead-out part of the electrode assembly are mutually welded, the first connecting part is arranged inside the battery monomer, and the phenomenon that the battery monomer is out of gas tightness due to welding defects, welding cracks or welding melt-through of the mutual welding area of the first wall and the first electrode lead-out part can be effectively alleviated, and the risk of leakage or liquid leakage of the battery monomer in use can be effectively reduced, so that the use reliability of the battery monomer is improved.

[0010] In some embodiments, the sealing member and the first wall jointly define an exhaust cavity, and the exhaust hole is in communication with the exhaust cavity and the containing cavity.

[0011] In the technical scheme, the exhaust cavity is formed between the sealing member and the first wall, and the exhaust cavity is in communication with the containing cavity inside the shell through the exhaust hole, so that the exhaust of the battery monomer when the battery monomer is out of control can enter the exhaust cavity through the exhaust hole and then be released through the sealing member. The battery monomer with this structure can store the exhaust of the battery monomer when the battery monomer is out of control to some extent, which is conducive to alleviating the phenomenon that the exhaust is accumulated in the containing cavity, and can alleviate the phenomenon that the sealing member is only partially in contact with the exhaust discharged by the exhaust hole, which is conducive to increasing the contact area of the exhaust and the sealing member, so that the timeliness and rate of pressure relief of the battery monomer can be improved.

[0012] In some embodiments, the blocking piece has a first surface facing the electrode assembly along the thickness direction of the first wall, the first surface abutting against the first wall; wherein the first surface is provided with a first groove, a groove wall surface of the first groove and the first wall jointly defining the exhaust cavity.

[0013] In the above technical solution, the blocking piece has a first surface facing the electrode assembly and mutually abutting against the first wall along the thickness direction of the first wall, and the first surface is provided with a first groove, a groove wall surface of the first groove and the first wall jointly defining the exhaust cavity communicating with the exhaust hole. The battery monomer adopting this structure can reduce the assembly difficulty between the blocking piece and the first wall, and can reduce the difficulty of forming the exhaust cavity between the blocking piece and the first wall, and has simple structure and is convenient to realize and assemble.

[0014] In some embodiments, the blocking piece has a second surface facing away from the electrode assembly along the thickness direction of the first wall, a first protrusion is formed on the side of the blocking piece facing away from the electrode assembly and corresponding to the position of the first groove, and the first protrusion protrudes from the second surface.

[0015] In the above technical solution, the first protrusion protruding from the second surface is formed on the side of the blocking piece facing away from the electrode assembly and corresponding to the position of the first groove, so that the first groove on the first surface of the blocking piece is a structure that can be formed by a stamping process, so as to form the first groove and the first protrusion on the two sides of the blocking piece respectively, thereby effectively reducing the forming difficulty of the blocking piece and improving the production efficiency of the battery monomer.

[0016] In some embodiments, the blocking piece is provided with a pressure relief groove, and the blocking piece is configured to be able to split along at least part of the pressure relief groove to release the internal pressure of the battery monomer when the battery monomer is pressure relieved; wherein, along the thickness direction of the first wall, a projection of the pressure relief groove is located in the first groove.

[0017] In the above technical solution, the pressure relief groove for pressure relief is provided on the blocking piece, so that the blocking piece can split along at least part of the pressure relief groove to release the internal pressure of the battery monomer when the battery monomer is thermal runaway, so as to realize the function of the blocking piece releasing the internal pressure of the battery monomer, and has simple structure and is convenient to realize. By setting the pressure relief groove of the blocking piece to have a projection in the thickness direction of the first wall located in the first groove, the blocking piece can split and release the exhaust of the internal pressure of the battery monomer in the area where the exhaust cavity is formed, thereby improving the convenience and smoothness of the blocking piece releasing the internal pressure of the battery monomer, and improving the timeliness and pressure relief rate of the battery monomer.

[0018] In some embodiments, the pressure relief groove is arranged on a side of the blocking member away from the electrode assembly in a thickness direction of the first wall.

[0019] In the above technical solution, by arranging the pressure relief groove on the side of the blocking member away from the electrode assembly in the thickness direction of the first wall, the pressure relief groove is facilitated to be machined on the blocking member, which is conducive to reducing the machining difficulty of the blocking member.

[0020] In some embodiments, the first electrode lead-out part includes a first tab and a first current collecting member, the first tab is connected to the main body part near one end of the first wall in the thickness direction of the first wall, the first current collecting member is arranged between the first tab and the first wall, the first current collecting member is connected to the first tab, and the first current collecting member is welded to the first wall to form the first connecting part; wherein the first current collecting member is provided with a through hole, the through hole penetrates through both sides of the first current collecting member in the thickness direction of the first wall, and the through hole is in communication with the exhaust hole.

[0021] In the above technical solution, the first electrode lead-out part is provided with a first tab and a first current collecting member, and the first current collecting member connects the first tab and the first wall, so that the first tab of the electrode assembly is in a structure welded to the first wall through the first current collecting member, thereby reducing the difficulty of mutual electrical connection between the electrode assembly and the first wall, and reducing the welding difficulty between the first electrode lead-out part and the first wall, thereby facilitating the assembly efficiency of the battery monomer. Wherein, by arranging the through hole penetrating through the first current collecting member in the thickness direction of the first wall on the first current collecting member, and the through hole and the exhaust hole on the first wall are in communication with each other, so that when the battery monomer appears thermal runaway, the exhaust inside the electrode assembly can enter the exhaust hole of the first wall through the through hole of the first current collecting member and then be discharged through the blocking member, thereby effectively improving the exhaust smoothness inside the battery monomer to improve the pressure relief rate of the battery monomer.

[0022] In some embodiments, at least part of the projection of at least one of the through holes in the thickness direction of the first wall is located in one of the exhaust holes.

[0023] In the above technical solution, by arranging at least part of the projection of at least one through hole on the first current collecting member in the thickness direction of the first wall to be located in one of the exhaust holes, the through hole can guide the exhaust in the containing cavity to the exhaust hole, thereby effectively improving the smoothness of the exhaust inside the battery monomer through the through hole into the exhaust hole, further improving the exhaust smoothness inside the battery monomer, and further improving the timeliness and rate of pressure relief of the battery monomer.

[0024] In some embodiments, the first electrode lead-out portion includes a first tab and a first current collecting member, the first tab is connected to the main body portion near one end of the first wall in the thickness direction of the first wall, the first current collecting member is arranged between the first tab and the first wall, the first current collecting member is connected to the first tab, and the first current collecting member is welded to the first wall to form the first connecting portion; wherein the first wall has a third surface facing the electrode assembly in the thickness direction of the first wall, and the first wall has a protruding portion protruding from the third surface, the protruding portion is welded to the first current collecting member to form the first connecting portion, an exhaust gap is formed between the first current collecting member and the third surface, and the exhaust gap communicates with the exhaust hole.

[0025] In the above technical solution, the first electrode lead-out portion is provided with a first tab and a first current collecting member, and the first current collecting member connects the first tab and the first wall, so that the first tab of the electrode assembly is a structure welded to the first wall through the first current collecting member, thereby reducing the difficulty of mutual electrical connection between the electrode assembly and the first wall, and reducing the welding difficulty between the first electrode lead-out portion and the first wall, thereby facilitating the assembly efficiency of the battery monomer. Wherein, by arranging the protruding portion which is welded to the first current collecting member on the third surface of the first wall facing the electrode assembly, and the protruding portion protrudes from the third surface, an exhaust gap which communicates with the exhaust hole is formed between the first current collecting member and the third surface of the first wall, so that the exhaust of the battery monomer in thermal runaway can enter the exhaust hole of the first wall through the exhaust gap and then be discharged through the blocking member, thereby effectively improving the exhaust smoothness inside the battery monomer, and improving the pressure relief timeliness and rate of the battery monomer.

[0026] In some embodiments, the shell is cylindrical, and the central axis of the shell extends in the thickness direction of the first wall; wherein the first wall is provided with a plurality of exhaust holes, and the plurality of exhaust holes includes a plurality of first exhaust holes, and the plurality of first exhaust holes are arranged at intervals around the central axis of the shell.

[0027] In the above technical solution, the shell of the battery monomer is cylindrical, and the central axis of the shell extends in the thickness direction of the first wall, by arranging a plurality of first exhaust holes on the first wall, and the plurality of first exhaust holes are arranged at intervals around the central axis of the shell, thereby increasing the exhaust area and exhaust region of the exhaust of the battery monomer in thermal runaway guided to the blocking member through the exhaust hole, thereby effectively improving the rate of the exhaust hole guiding the exhaust in the containing cavity to the blocking member, to improve the pressure relief timeliness and rate of the battery monomer.

[0028] In some embodiments, a projection of the first exhaust hole in a thickness direction of the first wall is a fan ring shape extending in a circumferential direction of the shell.

[0029] In the above technical solution, by setting the shape of the first exhaust hole as a fan ring shape extending in the circumferential direction of the shell, on the one hand, it is convenient to machine and form multiple first exhaust holes on the first wall, which are arranged at intervals around the central axis of the shell, and is conducive to reducing the difficulty of setting multiple first exhaust holes on the first wall, on the other hand, it can optimize the layout of multiple first exhaust holes on the first wall, and can maximize the exhaust area of the first exhaust hole under the same area, to further improve the rate of guiding the emissions in the containing cavity to the plugging member by the first exhaust hole.

[0030] In some embodiments, the electrode assembly has a central through hole extending in a thickness direction of the first wall, the central through hole penetrating both ends of the main body part in the thickness direction of the first wall; wherein multiple first exhaust holes are arranged around the second exhaust hole, and at least part of the projection of the second exhaust hole in the thickness direction of the first wall is located in the central through hole.

[0031] In the above technical solution, by setting the second exhaust hole on the first wall, and the multiple first exhaust holes are arranged around the second exhaust hole, and at least part of the projection of the second exhaust hole in the thickness direction of the first wall is located in the central through hole of the electrode assembly, the battery monomer using this structure can further increase the exhaust area of the exhaust hole on the first wall, and can effectively optimize the layout of the first exhaust hole and the second exhaust hole in the multiple exhaust holes, on the other hand, it can also realize that the emissions generated by the battery monomer in thermal runaway enter the second exhaust hole from the central through hole of the electrode assembly, and then pass through the plugging member for discharge, thereby facilitating further improving the rate of guiding the emissions in the containing cavity to the plugging member by the exhaust hole, to improve the timeliness and rate of pressure relief of the battery monomer.

[0032] In some embodiments, the first electrode lead-out part includes a first tab and a first current collecting member; the first tab is connected to one end of the main body part close to the first wall in the thickness direction of the first wall; the first current collecting member is arranged between the first tab and the first wall in the thickness direction of the first wall, the first current collecting member is connected with the first tab, and the first current collecting member is welded with the first wall and forms the first connecting part.

[0033] In the technical scheme, the first electrode lead-out part is provided with the first lug and the first current collecting member, the first lug is connected to the main body part, and the first current collecting member is connected to the first lug and welded to the first wall to form the first connecting part, so that the first lug of the electrode assembly is welded to the first wall through the first current collecting member, thereby reducing the difficulty of electrical connection between the electrode assembly and the first wall, reducing the welding difficulty between the first electrode lead-out part and the first wall, and improving the assembly efficiency of the battery monomer.

[0034] In some embodiments, the first current collecting member is welded to the first lug and forms a second connecting part.

[0035] In the technical scheme, the first current collecting member and the first lug are connected by welding, which improves the connection stability between the first current collecting member and the first lug, reduces the risk of mutual separation of the first current collecting member and the first lug during use, and improves the use reliability and stability of the battery monomer.

[0036] In some embodiments, the projection of the second connecting part along the thickness direction of the first wall does not overlap the projection of the first connecting part.

[0037] In the technical scheme, the first connecting part formed by welding the first current collecting member to the first wall and the second connecting part formed by welding the first current collecting member to the first lug are arranged in a structure in which the projections in the thickness direction of the first wall do not overlap, thereby reducing the interference between the first connecting part and the second connecting part, and alleviating the phenomenon that the welding pools of the first current collecting member and the first wall and the welding pools of the first current collecting member and the first lug overlap each other, thereby improving the welding quality between the first current collecting member and the first wall and between the first current collecting member and the first lug.

[0038] In some embodiments, the first wall is provided with exhaust holes communicating with the accommodating cavity, the exhaust holes penetrating the first wall along the thickness direction of the first wall; wherein, along the thickness direction of the first wall, the projection of at least one second connecting part is located in one exhaust hole.

[0039] In the above technical solution, the first wall is provided with exhaust holes penetrating through both sides of the first wall along the thickness direction of the first wall, at least one second connecting part formed by welding connection of the first current collecting member and the first tab is arranged such that the projection of the second connecting part in the thickness direction of the first wall is located in the exhaust hole. The battery monomer with this structure can on the one hand make the exhaust hole play a certain avoiding role for the second connecting part, which is beneficial to the interference between the second connecting part and the first wall. On the other hand, the electrode assembly can be assembled into the shell first, and then the first current collecting member and the first tab are welded and connected from the exhaust hole, so that the welding assembly between the first current collecting member and the first tab is not limited by the assembly sequence of the electrode assembly and the shell, thereby the assembly process of the battery monomer can be optimized, and after the first current collecting member and the first tab are welded and connected from the exhaust hole, the first current collecting member and the first wall can be welded and connected, which is beneficial to improving the assembly efficiency of the battery monomer.

[0040] In some embodiments, the first current collecting member is welded and connected with the first wall and forms a plurality of first connecting parts, and the first current collecting member is welded and connected with the first tab and forms a plurality of second connecting parts; wherein the plurality of first connecting parts and the plurality of second connecting parts are alternately and spaced arranged along the circumferential direction of the first current collecting member.

[0041] In the above technical solution, by welding and connecting the first current collecting member and the first wall and forming a plurality of first connecting parts, the connection reliability between the first current collecting member and the first wall can be further improved. Similarly, by welding and connecting the first current collecting member and the first tab and forming a plurality of second connecting parts, the connection reliability between the first current collecting member and the first tab can be further improved. By arranging the plurality of first connecting parts and the plurality of second connecting parts alternately and spaced along the circumferential direction of the first current collecting member, on the one hand, the interference between the first connecting parts and the second connecting parts can be reduced, so as to alleviate the phenomenon that the welding molten pool between the first current collecting member and the first wall and the welding molten pool between the first current collecting member and the first tab overlap each other, which is beneficial to improving the welding quality between the first current collecting member and the first wall and between the first current collecting member and the first tab. On the other hand, the uniformity of current flow between the first tab and the first current collecting member and between the first current collecting member and the first wall can be improved, which is beneficial to improving the overcurrent capacity and overcurrent effect between the first tab and the first current collecting member and between the first current collecting member and the first wall.

[0042] In some embodiments, the first tab is a cylindrical structure with a central axis extending along the thickness direction of the first wall, and the second connecting part extends along the radial direction of the first tab; wherein along the radial direction of the first tab, the size of the first tab is L1, and the size of the second connecting part is L2, 0.5≤L2 / L1≤1.

[0043] In the technical solution, the size of the second connecting part in the radial direction of the first tab is greater than half or more than half of the size of the first tab in the radial direction of the first tab, so that each circle of the first tab from the inside to the outside can form a welding relationship with the first current collecting member, thereby shortening the overflow path inside the electrode assembly and improving the overflow effect inside the electrode assembly to reduce the internal resistance of the electrode assembly during use, thereby improving the use performance and stability of the battery monomer.

[0044] In some embodiments, along the thickness direction of the first wall, the first wall has a fourth surface facing away from the electrode assembly, which is the surface of the first wall farthest away from the electrode assembly; wherein the fourth surface is provided with an assembly groove, the first electrode lead-out part is welded to the groove bottom wall of the assembly groove and forms the first connecting part, and at least part of the plugging piece is arranged in the assembly groove.

[0045] In the technical solution, the fourth surface of the first wall away from the electrode assembly is provided with an assembly groove, the groove bottom wall of the assembly groove is welded to the first electrode lead-out part and forms the first connecting part, and at least part of the plugging piece in the thickness direction of the first wall is arranged in the assembly groove, thereby facilitating the plugging piece to cover and seal the first connecting part, reducing the difficulty of covering and sealing the first connecting part by the plugging piece, improving the effect of covering and sealing the first connecting part by the plugging piece, positioning and protecting the plugging piece through the assembly groove, effectively reducing the assembly difficulty between the plugging piece and the first wall, improving the assembly efficiency of the plugging piece and the first wall, and effectively reducing the wear and impact of the plugging piece during use, thereby prolonging the service life of the plugging piece.

[0046] In some embodiments, along the thickness direction of the first wall, the plugging piece does not exceed the fourth surface.

[0047] In the technical solution, the plugging piece is arranged not to exceed the fourth surface in the thickness direction of the first wall, so that the plugging piece is integrally accommodated in the assembly groove in the thickness direction of the first wall, thereby further improving the protection effect of the assembly groove on the plugging piece to further reduce the wear and impact of the plugging piece during use.

[0048] In some embodiments, along the thickness direction of the first wall, the first wall also has a fifth surface facing the electrode assembly, and a second protrusion is formed on the side of the first wall facing the electrode assembly and corresponding to the position of the assembly groove, and the second protrusion protrudes from the fifth surface.

[0049] In the technical scheme, the second protrusion protruding from the fifth surface is formed on the side of the first wall facing the electrode assembly and corresponding to the position of the assembly groove, so that the assembly groove on the fourth surface of the first wall is a structure capable of being formed by a stamping process, thereby forming the assembly groove and the second protrusion on the two sides of the first wall respectively, so that the forming difficulty of the first wall of the shell can be effectively reduced, and the production efficiency of the battery monomer is improved.

[0050] In some embodiments, the outer circumferential surface of the plugging piece is welded to the groove side surface of the assembly groove to form a third connecting part, and the third connecting part is an annular structure.

[0051] In the technical scheme, the outer circumferential surface of the plugging piece is welded to the groove side surface of the assembly groove to form a third connecting part, and the third connecting part is an annular structure.

[0052] In some embodiments, the assembly groove includes a first groove and a second groove, the first groove is arranged on the fourth surface, the second groove is arranged on the groove bottom surface of the first groove, and the first electrode lead-out part is welded to the groove bottom wall of the second groove to form the first connecting part; wherein the outer circumferential surface of the plugging piece is welded to the groove side surface of the second groove to form the third connecting part.

[0053] In the technical scheme, the assembly groove includes a first groove arranged on the fourth surface and a second groove arranged on the groove bottom surface of the first groove, so that the assembly groove is a stepped groove structure arranged along the thickness direction of the first wall. The groove bottom wall of the second groove is welded to the first electrode lead-out part to form the first connecting part, and the outer circumferential surface of the plugging piece is welded to the groove side surface of the second groove to form the third connecting part, which is an annular structure. On the one hand, the plugging piece can cover and seal the first connecting part, which is beneficial to reduce the difficulty of covering and sealing the first connecting part by the plugging piece and improve the effect of covering and sealing the first connecting part by the plugging piece. On the other hand, the first groove can also accommodate and protect the part of the third connecting part protruding from the groove bottom surface of the first groove, which is beneficial to reduce the interference between the third connecting part and other components and reduce the phenomenon of bumping and wear of the third connecting part during use.

[0054] In some embodiments, the third connecting portion does not exceed the fourth surface in the thickness direction of the first wall.

[0055] In the above technical solution, by setting the third connecting portion in the thickness direction of the first wall to not exceed the fourth surface, the part of the third connecting portion protruding from the groove bottom surface of the first groove is located entirely within the first groove, thereby further improving the protection effect of the first groove on the third connecting portion, reducing the interference between the third connecting portion and other components, and reducing the phenomenon of the third connecting portion being knocked and worn during use.

[0056] In some embodiments, the blocking member has a second surface facing away from the electrode assembly in the thickness direction of the first wall, the second surface being connected to the outer peripheral surface of the blocking member, and the second surface being coplanar with the groove bottom surface of the first groove.

[0057] In the above technical solution, by setting the second surface on the side of the blocking member facing away from the electrode assembly and connected to the outer peripheral surface of the blocking member to be coplanar with the groove bottom surface of the first groove, the second surface of the blocking member is flush with the groove bottom surface of the first groove, thereby further improving the welding quality between the outer peripheral surface of the blocking member and the groove side surface of the second groove, and improving the assembly quality between the blocking member and the first wall.

[0058] In some embodiments, the blocking member abuts the groove bottom surface of the second groove in the thickness direction of the first wall.

[0059] In the above technical solution, by setting the blocking member to abut the groove bottom surface of the second groove in the thickness direction of the first wall, the groove bottom surface of the second groove can also support and position the blocking member, which on the one hand further improves the welding quality between the blocking member and the first wall, and on the other hand reduces the assembly difficulty between the blocking member and the first wall, thereby improving the assembly efficiency of the blocking member and the first wall.

[0060] In some embodiments, the groove bottom surface of the assembly groove is provided with a second groove, and the projection of the first connecting portion is located in the second groove in the thickness direction of the first wall.

[0061] In the technical solution, the second groove is arranged on the bottom surface of the assembly groove, and the projection of the first connecting part formed by the welding connection between the first electrode lead-out part and the bottom wall of the assembly groove in the thickness direction of the first wall is located in the second groove. In this way, the first connecting part is formed by the welding connection between the bottom wall of the second groove and the first electrode lead-out part. The battery cell with this structure can be covered and sealed by the blocking piece on the first connecting part, which can reduce the difficulty of covering and sealing the first connecting part by the blocking piece and improve the covering and sealing effect of the first connecting part by the blocking piece. In addition, the part of the first connecting part protruding from the bottom surface of the second groove can be accommodated by the second groove, which can reduce the interference between the first connecting part and the blocking piece arranged in the assembly groove.

[0062] In some embodiments, the blocking piece covers the second groove in the thickness direction of the first wall.

[0063] In the technical solution, the blocking piece is arranged to cover the second groove in the thickness direction of the first wall, so as to facilitate the covering of the first connecting part by the blocking piece and improve the covering and sealing effect of the first connecting part by the blocking piece.

[0064] In some embodiments, the bottom wall of the assembly groove has a third surface facing the electrode assembly in the thickness direction of the first wall. A protruding part protruding from the third surface is formed on the side of the bottom wall of the assembly groove facing the electrode assembly and corresponding to the position of the second groove. The protruding part is welded to the first electrode lead-out part and forms the first connecting part.

[0065] In the technical solution, the protruding part protruding from the third surface is formed on the side of the bottom wall of the second groove facing the electrode assembly and corresponding to the position of the second groove. The protruding part is welded to the first electrode lead-out part and forms the first connecting part. The battery cell with this structure can make the part of the first wall used for welding the first electrode lead-out part fully contact the first electrode lead-out part, which can improve the contact effect of the part of the first wall used for welding the first electrode lead-out part and the first electrode lead-out part. In this way, the welding difficulty between the first wall and the first electrode lead-out part can be reduced, and the phenomenon of virtual welding between the first wall and the first electrode lead-out part during welding assembly can be effectively reduced, so as to improve the welding quality of the first wall and the first electrode lead-out part.

[0066] In some embodiments, the shell comprises a shell body and an end cover; the shell body comprises an integrally formed side wall and a bottom wall, the side wall being arranged 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 arranged to form an opening, the side wall and the bottom wall jointly defining the accommodating cavity; the end cover is arranged to close the opening; and the bottom wall is the first wall.

[0067] In the above technical solution, by arranging the first wall of the shell as the bottom wall of the shell body opposite to the end cover in the thickness direction of the first wall, the battery monomer with this structure can make the first wall, which is welded to the first electrode lead-out part and forms the first connecting part, away from the end cover, so that there is no direct connection relationship between the first wall and the end cover, thereby relieving the influence of the stress generated when the end cover and the shell body are assembled and connected on the first connecting part, and facilitating improvement of the welding quality of the first wall and the first electrode lead-out part, so as to improve the production quality of the battery monomer.

[0068] In some embodiments, the shell comprises a shell body and an end cover; the shell body comprises an integrally formed side wall and a bottom wall, the side wall being arranged 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 arranged to form an opening, the side wall and the bottom wall jointly defining the accommodating cavity; the end cover is arranged to close the opening; and the end cover is the first wall.

[0069] In the above technical solution, by arranging the first wall of the shell as the end cover for closing the opening of the shell body, the battery monomer with this structure facilitates assembly of the plugging member on the end cover, and can reduce the welding difficulty between the first electrode lead-out part and the first wall, thereby facilitating reduction of the assembly difficulty of the battery monomer, so as to improve the production efficiency of the battery monomer.

[0070] In a second aspect, the embodiments of the present application also provide a battery comprising the battery monomer.

[0071] In a third aspect, the embodiments of the present application also provide a power consumption device comprising the battery monomer, and the battery monomer is used to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0072] 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. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0073] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0074] FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

[0075] FIG. 3 is a structural schematic diagram of a battery cell according to some embodiments of the present application;

[0076] FIG. 4 is an exploded view of a battery cell according to some embodiments of the present application;

[0077] FIG. 5 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0078] FIG. 6 is an enlarged view of portion A of the battery cell shown in FIG. 5;

[0079] FIG. 7 is a partial cross-sectional view of a housing of a casing according to some embodiments of the present application;

[0080] FIG. 8 is a structural schematic diagram of a housing of a casing according to some embodiments of the present application;

[0081] FIG. 9 is a front view of a housing of a casing according to some embodiments of the present application, facing a first wall in a thickness direction of the first wall;

[0082] FIG. 10 is a cross-sectional view of a plugging member of a battery cell according to some embodiments of the present application;

[0083] FIG. 11 is a structural schematic diagram of a first current collecting member of a battery cell according to some embodiments of the present application;

[0084] FIG. 12 is an assembly schematic diagram of a first wall and a first electrode lead-out portion of a battery cell according to some embodiments of the present application.

[0085] FIG. 12 is an assembly schematic diagram of a first wall and a first electrode lead-out portion of a battery cell according to some embodiments of the present application. DETAILED DESCRIPTION

[0086] 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 clearly described 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 a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0087] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification of the present application and the claims and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification of the present application and the claims or the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0088] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiments, nor is each embodiment mutually exclusive or alternative to the other embodiments.

[0089] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0090] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0091] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width, and other dimensions of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0092] “Multiple” appearing in the present application means two or more (including two).

[0093] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging the battery cell.

[0094] 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., which is not limited in the embodiments of the present application.

[0095] 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 process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time, the active ions can pass through.

[0096] 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 arranged on at least one surface of the positive electrode current collector.

[0097] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction of itself, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0098] As an example, the positive electrode current collector can adopt a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating treatment on the surface, stainless steel with silver plating treatment on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be adopted. The composite current collector can include a high 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 high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, the positive active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive active material can also be used. These positive active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide 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 / 3 O2 (which can also be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also 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, and the like.

[0100] 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 active material, or of course can be provided with a positive 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.

[0101] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0102] As an example, the negative current collector can employ a metal foil, a foamed 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, etc. can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. 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, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0103] As an example, the negative electrode sheet can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0104] 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 opposite surfaces of the negative current collector.

[0105] 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 only one or in combination of two or more.

[0106] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0107] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0108] In some embodiments, the separator is a separator film. The separator film can be various, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0109] 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 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.

[0110] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes and functions to transport ions and separate the positive and negative electrodes.

[0111] 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, gel, or solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0112] 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 bisoxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorodioxalate phosphate.

[0113] 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, butanediol sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent 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.

[0114] Among them, the gel electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0115] Among them, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0116] 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, etc.

[0117] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0118] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0119] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0120] In some embodiments, the electrode assembly is in a stacked structure.

[0121] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0122] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments that are stacked. One positive electrode sheet is clamped between adjacent folded segments.

[0123] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments that are stacked.

[0124] As an example, a plurality of separators can be provided, and each of the plurality of separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0125] As an example, the separators can be continuously provided, and the separators are provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0126] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0127] In some embodiments, the electrode assembly can be provided with tabs. The tabs can guide current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0128] 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, etc.

[0129] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes, but is not limited to, a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, and a multi-prismatic battery cell such as a hexagonal prismatic battery cell, etc.

[0130] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity.

[0131] In some embodiments, the battery can be a battery module, and when there are multiple battery monomers, the multiple battery monomers are arranged and fixed to form a battery module.

[0132] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and battery monomers or battery modules contained in the box body.

[0133] In some embodiments, the box body can be part of the chassis structure of the vehicle. For example, part of the box body can be at least part of the floor of the vehicle, or part of the box body can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0134] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0135] The battery has the outstanding advantages of high energy density, small environmental pollution, large power density, long service life, wide adaptation range, and small self-discharge coefficient, and is 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, and charge-discharge rate. In addition, the safety of the battery also needs to be considered.

[0136] For a general battery monomer, the battery monomer usually includes a shell and an electrode assembly contained in the shell. The electrode assembly has a tab formed thereon, and the tab is welded to a wall of the shell. The input or output of the electrical energy of the battery monomer can be realized through the shell. In the related art, in order to reduce the assembly difficulty between the tab and the shell and the connection stability between the tab and the shell, a current collecting member is usually arranged in the shell to weld the tab and the shell to realize the electrical connection between the tab and the shell. However, the battery monomer with such a structure needs to be penetrated and welded from the outside of the shell of the battery monomer when welding the current collecting member and the shell. The difficulty and the required power of the penetration welding are large, so that the penetration welding is easy to cause the welding defects, the welding cracks, or the welding melt-through in the welding area of the shell and the current collecting member, thereby easily leading to the air tightness failure of the shell, and causing the risks of the gas leakage or the liquid leakage of the battery monomer in the use process, and further adversely affecting the use reliability of the battery monomer.

[0137] In view of the above, in order to solve the problem of low use reliability of the battery monomer, the application provides a battery monomer, which comprises a shell, an electrode assembly and a blocking piece. The shell has an accommodating cavity formed inside, and the shell has a first wall. The electrode assembly is accommodated in the accommodating cavity, and the electrode assembly comprises a main body part and a first electrode lead-out part. The first electrode lead-out part is connected to one end of the main body part close to the first wall in the thickness direction of the first wall. The first electrode lead-out part is welded to the first wall and forms a first connecting part. The blocking piece is arranged on the side of the first wall away from the electrode assembly. The blocking piece is sealingly connected to the first wall, and the blocking piece covers the first connecting part in the thickness direction of the first wall.

[0138] In the battery monomer with the above structure, by arranging the blocking piece on the side of the first wall of the shell away from the electrode assembly, the blocking piece is sealingly connected to the first wall, and the blocking piece covers the first connecting part formed by the mutual welding of the first electrode lead-out part of the electrode assembly and the first wall in the thickness direction of the first wall. The blocking piece can seal and block the area where the first wall of the shell and the first electrode lead-out part of the electrode assembly are mutually welded, so that the first connecting part formed by the mutual welding of the first wall of the shell and the first electrode lead-out part of the electrode assembly is internally arranged in the battery monomer. This can effectively alleviate the phenomenon of air tightness failure of the battery monomer caused by welding defects, welding cracks or welding melt-through in the area where the first wall and the first electrode lead-out part are mutually welded, and can effectively reduce the risk of gas leakage or liquid leakage of the battery monomer during use, thereby improving the use reliability of the battery monomer.

[0139] The battery monomer disclosed in the application can be used in an electric device such as a vehicle, a ship or an aircraft, but is not limited thereto. The power supply system of the electric device can be composed of the battery monomer and a battery disclosed in the application. In this way, the problem of gas leakage or liquid leakage of the battery monomer during use caused by air tightness failure of the shell of the battery monomer can be alleviated, and the use reliability of the battery monomer can be improved.

[0140] The application provides an electric device using a battery as a power supply. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0141] The following embodiments are described with reference to a vehicle as an example of an electric device of an embodiment of the application for convenience of description.

[0142] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery 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 100 can be used to supply power for the vehicle 1000, for example, the battery 100 can be used as an operating power source or a usage power source of the vehicle 1000, etc. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 is used to control the battery 100 to supply power for the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and driving.

[0143] In some embodiments of the present application, the battery 100 can not only be used as an operating power source or a usage power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0144] Please refer to FIG. 2 and FIG. 3, FIG. 2 is an exploded structural diagram of the battery 100 provided by some embodiments of the present application, and FIG. 3 is a structural schematic diagram of a battery monomer 20 provided by some embodiments of the present application. The battery 100 includes a box body 10 and the battery monomer 20, and the battery monomer 20 is used to be accommodated in the box body 10.

[0145] The box body 10 is used to provide an assembly space for the battery monomer 20, and the box body 10 can adopt various structures. In some embodiments, the box body 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 mutually covered, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery monomer 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 covered on the open side of the second box body 12 to jointly define the assembly space with the second box body 12; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 is covered on the open side of the second box body 12.

[0146] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can have various shapes, such as a cylinder, a cuboid, or a square, etc. Exemplarily, in FIG. 2, the shape of the box body 10 is a cuboid.

[0147] In the battery 100, the battery cell 20 arranged in the case 10 can be one or multiple. When the battery cell 20 arranged in the case 10 is multiple, the multiple battery cells 20 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel or in a mixed manner, and then the whole of the multiple battery cells 20 is accommodated in the case 10. Of course, the battery 100 can also be that the multiple battery cells 20 are connected in series, in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series, in parallel or in a mixed manner to form a whole, and the whole is accommodated in the case 10.

[0148] In some embodiments, the battery 100 can further include other structures. For example, the battery 100 can further include a busbar component for connecting the multiple battery cells 20 to realize the electrical connection between the multiple battery cells 20.

[0149] Each 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. The battery cell 20 can be in the shape of a cuboid, a cylinder, a prism or other shapes. For example, in FIG. 3, the battery cell 20 is in the shape of a cylinder.

[0150] According to some embodiments of the present application, referring to FIG. 3, and further referring to FIG. 4, FIG. 5, FIG. 6 and FIG. 7, FIG. 4 is an exploded view of the structure of the battery cell 20 according to some embodiments of the present application, FIG. 5 is a sectional view of the battery cell 20 according to some embodiments of the present application, FIG. 6 is a partial enlarged view of position A of the battery cell 20 shown in FIG. 5, and FIG. 7 is a partial sectional view of the shell 212 of the housing 21 according to some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22 and a blocking member 23. The housing 21 has an accommodating cavity 2121 formed inside, and has a first wall 211. The electrode assembly 22 is accommodated in the accommodating cavity 2121, and includes a main body 221 and a first electrode lead-out part 222 connected to one end of the main body 221 close to the first wall 211 in the thickness direction X of the first wall. The first electrode lead-out part 222 is welded to the first wall 211 and forms a first connecting part 24. The blocking member 23 is arranged on the side of the first wall 211 away from the electrode assembly 22, and is sealingly connected to the first wall 211. The blocking member 23 covers the first connecting part 24 in the thickness direction X of the first wall.

[0151] The housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. The housing 21 can be in various structural forms. The material of the housing 21 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0152] In some embodiments, the shell 21 can include a housing 212 and an end cover 213, the housing 212 has an accommodating cavity 2121 formed inside, and the accommodating cavity 2121 has an opening 2122, that is, the housing 212 is a hollow structure with one end open, and the end cover 213 covers the opening 2122 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0153] The housing 212 can include a bottom wall and a side wall surrounding the bottom wall, one end of the side wall being connected to the bottom wall, and the other end being closed to form the opening 2122.

[0154] Optionally, the first wall 211 of the shell 21 can be the end cover 213 of the shell 21, or the bottom wall of the housing 212 of the shell 21. For example, in FIGS. 3 and 4, the first wall 211 is the bottom wall of the housing 212 arranged opposite to the end cover 213 in the thickness direction X of the first wall, and correspondingly, the thickness direction X of the first wall is the arrangement direction of the end cover 213 and the first wall 211, and is also the thickness direction of the end cover 213. Of course, in other embodiments, the first wall 211 can also be the end cover 213 of the shell 21.

[0155] In the assembly of the battery cell 20, the electrode assembly 22 can be first placed in the housing 212, and then the electrolyte is filled into the housing 212, and then the end cover 213 is covered on the opening 2122 of the housing 212 to close the opening 2122 of the housing 212.

[0156] The housing 212 can be of various shapes, such as a cylinder, a cuboid, etc. The shape of the housing 212 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, the housing 212 can be selected as a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the housing 212 can be selected as a cuboid structure. Of course, the end cover 213 can also be of various structures, such as a plate structure or a hollow structure with one end open, etc. For example, in FIGS. 3 and 4, the housing 212 is a cylindrical structure, and correspondingly, the side wall of the housing 212 is also a cylindrical structure, and the central axis of the housing 212 extends along the thickness direction X of the first wall, so that the first wall 211 is circular in the projection in the thickness direction X of the first wall.

[0157] It is understandable that 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 a shell body 212 and two end covers 213, the shell body 212 is a hollow structure with two openings 2122 on opposite sides, and one end cover 213 corresponds to cover one opening 2122 of the shell body 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte, that is, the shell body 212 of the shell 21 only includes a side wall, which is a hollow structure with two openings 2122 at both ends in the thickness direction X of the first wall, and the two end covers 213 cover the openings 2122 at both ends of the side wall in the thickness direction X of the first wall, respectively.

[0158] It should be noted that the electrode assembly 22 is a component that undergoes an electrochemical reaction in the battery monomer 20, and the electrode assembly 22 includes a main body part 221 and a first electrode lead-out part 222, the main body part 221 is the main component of the electrode assembly 22 that undergoes an electrochemical reaction in the battery monomer 20, and the first electrode lead-out part 222 functions to output or input the electrical energy of the electrode assembly 22. The structure of the main body part 221 of the electrode assembly 22 can be various, for example, the main body part 221 of the electrode assembly 22 can be a winding type structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or a laminated type structure formed by laminating the positive electrode sheet, the separator, and the negative electrode sheet. Exemplarily, in FIG. 4, the main body part 221 of the electrode assembly 22 is a winding type structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, and the main body part 221 of the electrode assembly 22 has a cylindrical structure, and the central axis of the main body part 221 of the electrode assembly 22 extends along the thickness direction X of the first wall.

[0159] 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.

[0160] Alternatively, the electrode assembly 22 accommodated in the shell 21 can be one or multiple. Exemplarily, in FIG. 4, only one electrode assembly 22 is arranged in the shell 21 of the battery monomer 20. Of course, the structure of the battery monomer 20 is not limited to this, and in other embodiments, the electrode assembly 22 accommodated in the shell 21 can also be two, three, four, five, six, seven, or eight, etc.

[0161] The first electrode lead-out part 222 is connected to one end of the main body part 221 close to the first wall 211 in the thickness direction X of the first wall, that is, the first electrode lead-out part 222 is located between the main body part 221 and the first wall 211 in the thickness direction X of the first wall, and the first electrode lead-out part 222 is connected to the main body part 221.

[0162] Optionally, the structure of the first electrode lead-out portion 222 can be various, and in FIGS. 4, 5 and 6, the first electrode lead-out portion 222 includes a first tab 2221 connected to one end of the main body portion 221 close to the first wall 211 in the thickness direction X of the first wall, and a first current collecting member 2222 disposed between the first tab 2221 and the first wall 211 in the thickness direction X of the first wall, the first current collecting member 2222 being connected to the side of the first tab 2221 facing the first wall 211, and the first current collecting member 2222 and the first wall 211 being welded to each other to form the first connection portion 24, that is, the first tab 2221 of the electrode assembly 22 is connected to the first wall 211 of the case 21 through the first current collecting member 2222. Of course, in other embodiments, the electrode assembly 22 can not be provided with the first current collecting member 2222, that is, the first electrode lead-out portion 222 is the first tab 2221 of the electrode assembly 22, and the first tab 2221 is directly welded to the first wall 211 of the case 21 to form the first connection portion 24.

[0163] The electrode assembly 22 further includes a second electrode lead-out portion 223 opposite in polarity to the first electrode lead-out portion 222, and the second electrode lead-out portion 223 and the first electrode lead-out portion 222 are respectively used to input or output the positive and negative electrodes of the electrode assembly 22. Of course, the structure of the second electrode lead-out portion 223 of the electrode assembly 22 can also be various, for example, the second electrode lead-out portion 223 can include only a second tab 2231, or the second electrode lead-out portion 223 can include a second tab 2231 and a second current collecting member connected to the main body portion 221 through the second tab 2231.

[0164] It should be noted that if the first tab 2221 is used to output the positive electrode of the electrode assembly 22, the first tab 2221 is a component formed by stacking the regions of the positive electrode tab on which the positive active material layer is not coated, and correspondingly, if the second tab 2231 is used to output the negative electrode of the electrode assembly 22, the second tab 2231 is a component formed by stacking the regions of the negative electrode tab on which the negative active material layer is not coated; conversely, if the first tab 2221 is used to output the negative electrode of the electrode assembly 22, the first tab 2221 is a component formed by stacking the regions of the negative electrode tab on which the negative active material layer is not coated, and correspondingly, if the second tab 2231 is used to output the positive electrode of the electrode assembly 22, the second tab 2231 is a component formed by stacking the regions of the positive electrode tab on which the positive active material layer is not coated.

[0165] Exemplarily, the first electrode lead-out portion 222 is arranged at one end of the main body portion 221 in the thickness direction X of the first wall and faces the first wall 211, and the second electrode lead-out portion 223 is arranged at the other end of the main body portion 221 in the thickness direction X of the first wall and is away from the first wall 211, that is, the first electrode lead-out portion 222 and the second electrode lead-out portion 223 are arranged at two ends of the main body portion 221 respectively, and the first electrode lead-out portion 222 is arranged to face the first wall 211.

[0166] In some embodiments, the battery monomer 20 can further include an electrode terminal 25 which is insulatively mounted on one wall of the shell 21 at the end away from the first wall 211 in the thickness direction X of the first wall, and the electrode terminal 25 is electrically connected with the second electrode lead-out portion 223, so that the electrode terminal 25 serves as another output pole of the battery monomer 20, that is, the electrode terminal 25 can serve to input or output the electric energy of the battery monomer 20, so that the electric energy of the battery monomer 20 can be input or output through the electrode terminal 25 and the first wall 211.

[0167] In some embodiments, the battery monomer 20 can further include an electrode terminal 25 which is insulatively mounted on one wall of the shell 21 at the end away from the first wall 211 in the thickness direction X of the first wall, and the electrode terminal 25 is electrically connected with the second electrode lead-out portion 223, so that the electrode terminal 25 serves as another output pole of the battery monomer 20, that is, the electrode terminal 25 can serve to input or output the electric energy of the battery monomer 20, so that the electric energy of the battery monomer 20 can be input or output through the electrode terminal 25 and the first wall 211.

[0168] Exemplarily, in FIGS. 4 and 5, the first wall 211 is the bottom wall of the shell 212, and correspondingly, the electrode terminal 25 is insulatively mounted on the end cover 213 of the shell 21. As shown in FIG. 5, the electrode terminal 25 is a structure riveted on the end cover 213, that is, the end cover 213 is provided with a mounting hole 2131, the hole of the end cover 213 penetrates through both sides of the end cover 213 in the thickness direction X of the first wall, and part of the electrode terminal 25 is arranged in the mounting hole 2131, and the electrode terminal 25 has a first clamping portion on the side of the end cover 213 facing the electrode assembly 22 and a second clamping portion on the side of the end cover 213 away from the electrode assembly 22, and at least part of the end cover 213 is located between the first clamping portion and the second clamping portion in the thickness direction X of the first wall, so that the first clamping portion and the second clamping portion can clamp the end cover 213 to rivet the electrode terminal 25 on the first wall 211. Of course, in other embodiments, the electrode terminal 25 can also be a structure clamped or adhered on the end cover 213.

[0169] Exemplarily, the material of the electrode terminal 25 can be various, for example, the material of the electrode terminal 25 can be copper, iron, aluminum, steel or aluminum alloy, etc.

[0170] It should be noted that in the embodiment in which the second electrode lead-out portion 223 only includes the second tab 2231, the second tab 2231 of the electrode assembly 22 is directly connected to the electrode terminal 25, such as welding connection or abutting, etc. In the embodiment in which the second electrode lead-out portion 223 includes the second tab 2231 and the second current collecting member, the second tab 2231 is connected to the main body portion 221, and the second current collecting member connects the second tab 2231 and the electrode terminal 25, so that the second tab 2231 is indirectly connected to the electrode terminal 25 through the second current collecting member. Similarly, the connection structure of the second current collecting member and the second tab 2231 and the second current collecting member and the electrode terminal 25 can be various, such as welding connection or abutting, etc.

[0171] Exemplarily, in FIGS. 4 and 5, the second electrode lead-out portion 223 is the second tab 2231 of the electrode assembly 22, that is, the second tab 2231 of the electrode assembly 22 is directly connected to the electrode terminal 25.

[0172] Exemplarily, the material of the second current collecting member can be various, such as copper, iron, aluminum, steel or aluminum alloy, etc.

[0173] Of course, the structure of the battery monomer 20 is not limited to this, and in other embodiments, the battery monomer 20 can also not be provided with the electrode terminal 25. In the embodiment in which the shell 21 includes the end cover 213 and the shell 212, and the bottom wall of the shell 212 opposite to the end cover 213 is the first wall 211, the end cover 213 can also be an insulating installation structure with the shell 212, that is, an insulating piece is arranged between the end cover 213 and the shell 212, so that the end cover 213 and the shell 212 are not electrically connected. Correspondingly, the second electrode lead-out portion 223 can be electrically connected to the end cover 213, that is, the end cover 213 can play a role of inputting or outputting the electric energy of the battery monomer 20.

[0174] The first electrode lead-out portion 222 is welded to the first wall 211 and forms the first connection portion 24. Correspondingly, the first connection portion 24 is a welding mark formed by the mutual welding connection of the first electrode lead-out portion 222 and the first wall 211.

[0175] The blocking piece 23 is arranged on the side of the first wall 211 away from the electrode assembly 22. The blocking piece 23 is sealingly connected to the first wall 211, that is, the blocking piece 23 and the first wall 211 are connected to each other and form a sealed structure, so that the space between the blocking piece 23 and the first wall 211 is not communicated with the outside of the battery monomer 20, and the area where the first connection portion 24 is located is sealed inside the battery monomer 20 by the blocking piece 23.

[0176] Exemplarily, the structure of the sealing connection between the blocking member 23 and the first wall 211 can be various, such as welding connection or adhesive connection, etc. Similarly, the material of the blocking member 23 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0177] The blocking member 23 covers the first connecting part 24 in the thickness direction X of the first wall, i.e., the projection of the first connecting part 24 on the thickness direction X of the first wall is located in the blocking member 23.

[0178] In the embodiment, by arranging the blocking member 23 on the side of the first wall 211 of the shell 21 away from the electrode assembly 22, the blocking member 23 is in a sealing connection with the first wall 211, and the blocking member 23 covers the first connecting part 24 formed by the welding connection between the first electrode lead-out part 222 and the first wall 211 in the thickness direction X of the first wall, so that the blocking member 23 can seal and block the area where the first wall 211 of the shell 21 and the first electrode lead-out part 222 of the electrode assembly 22 are welded to each other, so as to realize the structure that the first connecting part 24 formed by the welding connection between the first wall 211 of the shell 21 and the first electrode lead-out part 222 of the electrode assembly 22 is internally arranged in the battery monomer 20, thereby effectively alleviating the phenomenon that the battery monomer 20 has air tightness failure due to the welding defects, welding cracks or welding melt-through of the area where the first wall 211 and the first electrode lead-out part 222 are welded to each other, and further effectively reducing the risk of gas leakage or liquid leakage of the battery monomer 20 in use, so as to improve the use reliability of the battery monomer 20.

[0179] According to some embodiments of the present application, referring to FIGS. 5, 6 and 7, and further referring to FIGS. 8 and 9, FIG. 8 is a structural schematic view of the shell 212 of the shell 21 provided by some embodiments of the present application, and FIG. 9 is a front view of the shell 212 of the shell 21 provided by some embodiments of the present application in the thickness direction X of the first wall facing the first wall 211. The first wall 211 is provided with an exhaust hole 2111 communicating with the accommodating cavity 2121, and the exhaust hole 2111 penetrates the first wall 211 in the thickness direction X of the first wall. The blocking member 23 is a pressure relief component, and the blocking member 23 is configured to be able to release the internal pressure of the battery monomer 20, and the exhaust hole 2111 is configured to be able to guide the exhaust in the accommodating cavity 2121 to the blocking member 23.

[0180] The blocking piece 23 is in sealing connection with the first wall 211, so that the exhaust hole 2111 is not in communication with the outside of the battery monomer 20. The blocking piece 23 is a pressure relief component, so that the blocking piece 23 can play a role of relieving the internal pressure of the battery monomer 20. That is, the blocking piece 23 is used to be damaged when the internal pressure or temperature of the battery monomer 20 reaches a predetermined value, so that the exhaust hole 2111 can be in communication with the outside of the battery monomer 20 through the blocking piece 23, so that the exhaust hole 2111 can guide the exhaust generated in the containing cavity 2121 due to the thermal runaway of the battery monomer 20 to the blocking piece 23 for exhaust, so as to relieve the internal pressure of the battery monomer 20.

[0181] Optionally, the structure of the blocking piece 23 can be various, for example, the blocking piece 23 can be a component such as an explosion-proof valve, an explosion-proof sheet, an air valve, a pressure relief valve or a safety valve.

[0182] It should be noted that the exhaust hole 2111 provided on the first wall 211 can be one or multiple. For example, in FIGS. 8 and 9, multiple exhaust holes 2111 are provided on the first wall 211.

[0183] In this embodiment, by setting the blocking piece 23 as a pressure relief component for relieving the internal pressure of the battery monomer 20, and providing the exhaust hole 2111 penetrating through the first wall 211 and communicating with the containing cavity 2121, the exhaust hole 2111 can also guide the exhaust in the battery monomer 20 to the blocking piece 23 for exhaust when the battery monomer 20 is in thermal runaway. Therefore, while the blocking piece 23 realizes the blocking of the first connecting part 24 to reduce the risk of air tightness failure of the battery monomer 20, the blocking piece 23 can also realize the relief of the internal pressure of the battery monomer 20. The blocking piece 23 can be both embedded in the inside of the battery monomer 20 and play a pressure relief role when the battery monomer 20 is in thermal runaway, thereby optimizing the structure of the battery monomer 20 and reducing the manufacturing cost of the battery monomer 20.

[0184] According to some embodiments of the present application, referring to FIGS. 6, 7 and 8, the blocking piece 23 and the first wall 211 jointly define an exhaust cavity 26, and the exhaust hole 2111 communicates the exhaust cavity 26 and the containing cavity 2121.

[0185] The blocking piece 23 and the first wall 211 jointly define the exhaust cavity 26, that is, the exhaust cavity 26 is formed between the blocking piece 23 and the first wall 211, and the exhaust cavity 26 is not in communication with the outside of the battery monomer 20.

[0186] The exhaust hole 2111 communicates the exhaust cavity 26 and the containing cavity 2121, that is, one end of the exhaust hole 2111 extends to the cavity wall surface of the containing cavity 2121, and the other end extends to the cavity wall surface of the exhaust cavity 26.

[0187] In the present embodiment, by forming the exhaust cavity 26 between the blocking piece 23 and the first wall 211, and by the exhaust cavity 26 being in communication with the containing cavity 2121 inside the shell 21 through the exhaust hole 2111, the exhaust generated when the battery monomer 20 is in thermal runaway can enter the exhaust cavity 26 through the exhaust hole 2111 and then be discharged through the blocking piece 23. The battery monomer 20 with such a structure can on one hand play a certain buffering role for the exhaust generated when the battery monomer 20 is in thermal runaway through the exhaust cavity 26, which is conducive to alleviating the phenomenon of exhaust accumulation in the containing cavity 2121, and on the other hand can alleviate the phenomenon that the blocking piece 23 is only partially in contact with the exhaust discharged by the exhaust hole 2111, which is conducive to increasing the contact area of the exhaust with the blocking piece 23, so as to improve the timeliness and rate of pressure relief of the battery monomer 20.

[0188] According to some embodiments of the present application, referring to FIGS. 6 and 7, and further referring to FIG. 10, which is a sectional view of the blocking piece 23 of the battery monomer 20 provided by some embodiments of the present application. Along the thickness direction X of the first wall, the blocking piece 23 has a first surface 231 facing the electrode assembly 22, and the first surface 231 abuts against the first wall 211. The first surface 231 is provided with a first groove 232, and the groove wall surface of the first groove 232 cooperates with the first wall 211 to define the exhaust cavity 26.

[0189] Among them, the first surface 231 is the surface of the blocking piece 23 on the thickness direction X of the first wall and facing the electrode assembly 22 and abutting against the first wall 211, and the first surface 231 is provided with the first groove 232, that is, the side of the blocking piece 23 abutting against the first wall 211 in the thickness direction X of the first wall is recessed in the direction away from the electrode assembly 22 to form the first groove 232.

[0190] The groove wall surface of the first groove 232 cooperates with the first wall 211 to define the exhaust cavity 26, that is, the first wall 211 covers the slot of the first groove 232, so that the first wall 211 and the groove wall surface of the first groove 232 cooperatively form the exhaust cavity 26.

[0191] It should be noted that in other embodiments, the structure of the exhaust cavity 26 defined by the first wall 211 and the blocking member 23 together can also be various, for example, the first recess 232 can be arranged on the side of the first wall 211 facing the blocking member 23, and the blocking member 23 covers the first recess 232, so that the groove wall surface of the first recess 232 and the blocking member 23 together define the exhaust cavity 26. Of course, referring to FIGS. 6 and 7, in the embodiment in which the assembly groove 2115 is arranged on the fourth surface 2114 of the first wall 211 away from the electrode assembly 22, and the blocking member 23 is assembled in the assembly groove 2115, the blocking member 23 can also be arranged in a spaced manner with the groove bottom surface of the assembly groove 2115 to form the exhaust cavity 26 between the blocking member 23 and the groove bottom surface of the assembly groove 2115.

[0192] In the present embodiment, the blocking member 23 has a first surface 231 facing the electrode assembly 22 and abutting against the first wall 211 in the thickness direction X of the first wall, and the first recess 232 is arranged on the first surface 231 to define the exhaust cavity 26 communicating with the exhaust hole 2111 together with the first wall 211 through the groove wall surface of the first recess 232. The battery monomer 20 adopting such a structure can reduce the assembly difficulty between the blocking member 23 and the first wall 211, and can reduce the difficulty of forming the exhaust cavity 26 between the blocking member 23 and the first wall 211, and has a simple structure and is easy to realize and assemble.

[0193] In some embodiments, as shown in FIGS. 6 and 10, along the thickness direction X of the first wall, the blocking member 23 has a second surface 233 away from the electrode assembly 22, and a first protrusion 234 is formed on the side of the blocking member 23 away from the electrode assembly 22 and corresponding to the position of the first recess 232, and the first protrusion 234 protrudes from the second surface 233.

[0194] For example, the first recess 232 arranged on the first surface 231 of the blocking member 23 is a structure formed by a stamping process to form the first recess 232 on the side of the blocking member 23 facing the electrode assembly 22, and form the first protrusion 234 on the side of the blocking member 23 away from the electrode assembly 22 and corresponding to the position of the first recess 232. Of course, the processing method of the first recess 232 arranged on the first surface 231 of the blocking member 23 is not limited to this, and in other embodiments, the first recess 232 arranged on the first surface 231 of the blocking member 23 can also be formed by casting or milling and other processing processes.

[0195] In the embodiment, the first recess 232 on the first surface 231 of the blocking piece 23 is a structure capable of being formed by a stamping process, so that the first recess 232 and the first protrusion 234 are respectively formed on the two sides of the blocking piece 23, thereby effectively reducing the forming difficulty of the blocking piece 23, and improving the production efficiency of the battery monomer 20.

[0196] According to some embodiments of the present application, referring to FIG. 10, the blocking piece 23 is provided with a pressure relief groove 235, and the blocking piece 23 is configured to be capable of being split along at least part of the pressure relief groove 235 when the battery monomer 20 is pressure relieved, so as to release the internal pressure of the battery monomer 20. In the thickness direction X of the first wall, the projection of the pressure relief groove 235 is located in the first recess 232.

[0197] In the thickness direction X of the first wall, the projection of the pressure relief groove 235 is located in the first recess 232, that is, the pressure relief groove 235 is provided corresponding to the first recess 232 in the thickness direction X of the first wall, if the pressure relief groove 235 is provided on the side of the blocking piece 23 facing the electrode assembly 22 in the thickness direction X of the first wall, the pressure relief groove 235 is provided on the bottom surface of the first recess 232, if the pressure relief groove 235 is provided on the side of the blocking piece 23 away from the electrode assembly 22 in the thickness direction X of the first wall, the pressure relief groove 235 is provided corresponding to the first recess 232 in the thickness direction X of the first wall.

[0198] In the thickness direction X of the first wall, the projection of the pressure relief groove 235 is located in the first recess 232, that is, the pressure relief groove 235 is provided corresponding to the first recess 232 in the thickness direction X of the first wall, if the pressure relief groove 235 is provided on the side of the blocking piece 23 facing the electrode assembly 22 in the thickness direction X of the first wall, the pressure relief groove 235 is provided on the bottom surface of the first recess 232, if the pressure relief groove 235 is provided on the side of the blocking piece 23 away from the electrode assembly 22 in the thickness direction X of the first wall, the pressure relief groove 235 is provided corresponding to the first recess 232 in the thickness direction X of the first wall.

[0199] In the embodiment, the pressure relief groove 235 is provided on the blocking piece 23 for pressure relief, so that the blocking piece 23 can be split along at least part of the pressure relief groove 235 to release the internal pressure of the battery monomer 20 when the battery monomer 20 is thermal runaway, thereby achieving the function of the blocking piece 23 releasing the internal pressure of the battery monomer 20, and the structure is simple and easy to implement. By setting the projection of the pressure relief groove 235 of the blocking piece 23 in the thickness direction X of the first wall to be located in the first recess 232, the blocking piece 23 can be split and release the internal discharge of the battery monomer 20 in the area where the exhaust cavity 26 is formed, thereby improving the convenience and smoothness of the blocking piece 23 releasing the internal pressure of the battery monomer 20, and improving the timeliness and pressure relief rate of the battery monomer 20.

[0200] In some embodiments, as shown in FIG. 6 and FIG. 10, the pressure relief groove 235 is arranged on the side of the blocking member 23 away from the electrode assembly 22 along the thickness direction X of the first wall.

[0201] It should be noted that in the embodiment in which the first protrusion 234 is formed on the side of the blocking member 23 away from the electrode assembly 22 and corresponding to the first groove 232, the pressure relief groove 235 is arranged on the side of the first protrusion 234 away from the electrode assembly 22 along the thickness direction X of the first wall.

[0202] In the present embodiment, by arranging the pressure relief groove 235 on the side of the blocking member 23 away from the electrode assembly 22 along the thickness direction X of the first wall, it is convenient to process the pressure relief groove 235 on the blocking member 23, which is conducive to reducing the processing difficulty of the blocking member 23.

[0203] According to some embodiments of the present application, referring to FIG. 4, FIG. 6 and FIG. 9, and further referring to FIG. 11 and FIG. 12, FIG. 11 is a structural schematic diagram of the first current collecting member 2222 of the battery monomer 20 provided by some embodiments of the present application, and FIG. 12 is an assembly schematic diagram of the first wall 211 and the first electrode lead-out part 222 of the battery monomer 20 provided by some embodiments of the present application. The first electrode lead-out part 222 includes the first tab 2221 and the first current collecting member 2222, the first tab 2221 is connected to one end of the main body part 221 close to the first wall 211 along the thickness direction X of the first wall, the first current collecting member 2222 is arranged between the first tab 2221 and the first wall 211, the first current collecting member 2222 is connected with the first tab 2221, and the first current collecting member 2222 is welded with the first wall 211 to form the first connecting part 24. The first current collecting member 2222 is provided with a through hole 2222a, the through hole 2222a penetrates through both sides of the first current collecting member 2222 along the thickness direction X of the first wall, and the through hole 2222a is in communication with the exhaust hole 2111, the through hole 2222a is configured to guide the exhaust in the containing cavity 2121 to the exhaust hole 2111.

[0204] In some embodiments, the first electrode lead-out part 222 includes the first tab 2221 and the first current collecting member 2222, the first tab 2221 is connected with the main body part 221, and the first current collecting member 2222 is located between the first wall 211 and the first tab 2221 along the thickness direction X of the first wall, so that the first tab 2221 is connected with the first wall 211 through the first current collecting member 2222.

[0205] The first current collecting member 2222 is provided with a through hole 2222a penetrating through the first current collecting member 2222 along the thickness direction X of the first wall, that is, the through hole 2222a on the first current collecting member 2222 is a structure extending along the thickness direction X of the first wall and penetrating through the surfaces of the first current collecting member 2222 on both sides in the thickness direction X of the first wall.

[0206] The through hole 2222a is in communication with the exhaust hole 2111, and the through hole 2222a is configured to be able to guide the exhaust in the accommodation cavity 2121 to the exhaust hole 2111, that is, the exhaust generated when the battery cell 20 in the accommodation cavity 2121 is in thermal runaway can enter the exhaust hole 2111 through the through hole 2222a. Optionally, the through hole 2222a and the exhaust hole 2111 can be in direct communication or indirect communication. In the embodiment of the present application, the first current collecting member 2222 and the third surface 2112 of the first wall 211 form an exhaust gap 27, and correspondingly, the through hole 2222a on the first current collecting member 2222 and the exhaust hole 2111 on the first wall 211 are in indirect communication through the exhaust gap 27.

[0207] It should be noted that the through hole 2222a provided on the first current collecting member 2222 can be one or multiple. For example, in FIG. 11, the first current collecting member 2222 is a circular disc structure, and the first current collecting member 2222 is provided with multiple through holes 2222a. The multiple through holes 2222a are arranged at intervals along the circumferential direction of the first current collecting member 2222. The through hole 2222a is a strip hole shape, and the length direction of the through hole 2222a is the radial direction of the first current collecting member 2222. For example, in FIG. 11, the first current collecting member 2222 is provided with four through holes 2222a. Of course, in other embodiments, the first current collecting member 2222 can be provided with two, three, five, six, seven or the like.

[0208] In the embodiment, the first electrode lead-out portion 222 is provided with the first tab 2221 and the first current collecting member 2222, and the first current collecting member 2222 connects the first tab 2221 and the first wall 211, so that the first tab 2221 of the electrode assembly 22 is in a structure of being weldedly connected with the first wall 211 through the first current collecting member 2222, thereby being capable of reducing the difficulty of the mutual electrical connection between the electrode assembly 22 and the first wall 211, and reducing the welding difficulty between the first electrode lead-out portion 222 and the first wall 211, and further being capable of improving the assembly efficiency of the battery monomer 20. In the embodiment, the through hole 2222a penetrating through the first current collecting member 2222 in the thickness direction X of the first wall is provided on the first current collecting member 2222, and the through hole 2222a and the exhaust hole 2111 on the first wall 211 are in communication with each other, so that when the battery monomer 20 appears thermal runaway, the exhaust inside the electrode assembly 22 can enter the exhaust hole 2111 of the first wall 211 through the through hole 2222a of the first current collecting member 2222 and then be discharged through the blocking member 23, thereby being capable of effectively improving the exhaust smoothness inside the battery monomer 20, and improving the pressure relief rate of the battery monomer 20.

[0209] In some embodiments, referring to FIG. 12, at least part of the projection of the at least one through hole 2222a in the thickness direction X of the first wall is located in one exhaust hole 2111.

[0210] In the embodiment, at least part of the projection of the at least one through hole 2222a in the thickness direction X of the first wall is located in one exhaust hole 2111, that is, part or the whole of the projection of one through hole 2222a in the thickness direction X of the first wall can be located in one exhaust hole 2111, or part or the whole of the projection of multiple through holes 2222a in the thickness direction X of the first wall can be located in one exhaust hole 2111, or the projection of the through hole 2222a in the thickness direction X of the first wall can be located in multiple exhaust holes 2111.

[0211] For example, in FIG. 12, each through hole 2222a is provided corresponding to one exhaust hole 2111 in the thickness direction X of the first wall, and the whole of the projection of each through hole 2222a in the thickness direction X of the first wall is located in one exhaust hole 2111.

[0212] In the embodiment, at least part of the projection of the at least one through hole 2222a in the thickness direction X of the first wall is located in one exhaust hole 2111, so that the through hole 2222a guides the exhaust in the containing cavity 2121 to the exhaust hole 2111, thereby being capable of effectively improving the smoothness of the exhaust inside the battery monomer 20 entering the exhaust hole 2111 through the through hole 2222a, further improving the exhaust smoothness inside the battery monomer 20, and further improving the timeliness and the pressure relief rate of the battery monomer 20.

[0213] According to some embodiments of the present application, referring to FIGS. 6 and 7, the first electrode lead-out portion 222 includes a first tab 2221 and a first current collecting member 2222, the first tab 2221 is connected to the main body portion 221 at one end close to the first wall 211 along the thickness direction X of the first wall, and the first current collecting member 2222 is arranged between the first tab 2221 and the first wall 211, the first current collecting member 2222 is connected to the first tab 2221, and the first current collecting member 2222 is welded to the first wall 211 to form a first connecting portion 24. The first wall 211 has a third surface 2112 facing the electrode assembly 22 along the thickness direction X of the first wall, and the first wall 211 has a protruding portion 2113 protruding from the third surface 2112, the protruding portion 2113 is welded to the first current collecting member 2222 to form the first connecting portion 24, and the first current collecting member 2222 and the third surface 2112 form an exhaust gap 27, and the exhaust gap 27 is in communication with the exhaust hole 2111.

[0214] The third surface 2112 is the surface of the first wall 211 on which the protruding portion 2113 is provided, and exemplarily, in FIG. 6, the first wall 211 is provided with a fitting groove 2115 on a fourth surface 2114 of the first wall facing away from the electrode assembly 22 along the thickness direction X of the first wall, and a second protrusion 2117 protruding from a fifth surface 2116 is formed on the side of the first wall 211 facing the electrode assembly 22, and the protruding portion 2113 protrudes from the side of the second protrusion 2117 facing the electrode assembly 22 along the thickness direction X of the first wall, and the surface of the second protrusion 2117 on the side facing the electrode assembly 22 along the thickness direction X of the first wall is the third surface 2112.

[0215] The protruding portion 2113 protrudes from the third surface 2112 of the first wall 211, so that the first current collecting member 2222 of the first electrode lead-out portion 222 can abut and be welded along the thickness direction X of the first wall, so that the third surface 2112 and the first current collecting member 2222 are arranged at intervals along the thickness direction X of the first wall to form the exhaust gap 27 between the first current collecting member 2222 and the third surface 2112.

[0216] The exhaust gap 27 is in communication with the exhaust hole 2111, that is, one end of the exhaust hole 2111 extends to the third surface 2112, so that the exhaust hole 2111 can be in communication with the exhaust gap 27, and correspondingly, the other end of the exhaust hole 2111 extends to the bottom surface of the fitting groove 2115, so that the exhaust hole 2111 is arranged on the bottom surface of the fitting groove 2115 and penetrates the bottom wall of the fitting groove 2115 along the thickness direction X of the first wall.

[0217] In the embodiment, the first electrode lead-out portion 222 is provided with the first tab 2221 and the first current collecting member 2222, and the first current collecting member 2222 connects the first tab 2221 and the first wall 211, so that the first tab 2221 of the electrode assembly 22 is in a structure of being weldedly connected with the first wall 211 through the first current collecting member 2222, thereby being capable of reducing the difficulty of the mutual electrical connection between the electrode assembly 22 and the first wall 211, and reducing the welding difficulty between the first electrode lead-out portion 222 and the first wall 211, and further being capable of improving the assembly efficiency of the battery monomer 20. In the embodiment, the first wall 211 is provided with the protruding portion 2113 which is mutually welded with the first current collecting member 2222 and protrudes from the third surface 2112 of the first wall 211 facing the electrode assembly 22, so as to form the exhaust gap 27 which is in communication with the exhaust hole 2111 between the first current collecting member 2222 and the third surface 2112 of the first wall 211, thereby enabling the exhaust generated by the battery monomer 20 in the thermal runaway to enter the exhaust hole 2111 of the first wall 211 through the exhaust gap 27 and then be discharged through the blocking member 23, and further being capable of effectively improving the exhaust smoothness inside the battery monomer 20, so as to improve the timeliness and rate of pressure relief of the battery monomer 20.

[0218] According to some embodiments of the present application, as shown in FIGS. 3, 8 and 9, the shell 21 is in a cylindrical shape, and the central axis of the shell 21 extends along the thickness direction X of the first wall. The first wall 211 is provided with a plurality of exhaust holes 2111, and the plurality of exhaust holes 2111 includes a plurality of first exhaust holes 2111a which are arranged at intervals around the central axis of the shell 21.

[0219] In the embodiment, the shell 21 is in a cylindrical shape, and the central axis of the shell 21 extends along the thickness direction X of the first wall, and correspondingly, the projection of the first wall 211 on the thickness direction X of the first wall is in a circular shape.

[0220] The plurality of first exhaust holes 2111a are arranged at intervals around the central axis of the shell 21, that is to say, in the plane perpendicular to the thickness direction X of the first wall, the orthographic projection of the plurality of first exhaust holes 2111a is in a structure of being arranged at intervals around the center of the orthographic projection of the first wall 211.

[0221] Exemplarily, in FIG. 9, the first wall 211 is provided with four first exhaust holes 2111a, and the four exhaust holes 2111 are arranged at intervals along the circumferential direction of the first wall 211.

[0222] In the embodiment, the shell 21 of the battery cell 20 is in a cylindrical shape, and the central axis of the shell 21 extends along the thickness direction X of the first wall. By providing a plurality of first exhaust holes 2111a on the first wall 211 and arranging the plurality of first exhaust holes 2111a around the central axis of the shell 21 at intervals, the exhaust area and the exhaust region of the exhaust holes 2111 through which the exhaust generated by the battery cell 20 during thermal runaway can be guided to the blocking member 23 can be increased, and thus the rate at which the exhaust holes 2111 guide the exhaust in the accommodation cavity 2121 to the blocking member 23 can be effectively improved, so as to improve the timeliness and the rate of pressure relief of the battery cell 20.

[0223] In some embodiments, as shown in FIGS. 8 and 9, the projection of the first exhaust hole 2111a on the thickness direction X of the first wall is in a fan ring shape extending along the circumference of the shell 21.

[0224] For example, the center of the projection of the first exhaust hole 2111a on the thickness direction X of the first wall in the fan ring shape is concentrically arranged with the center of the projection of the first wall 211 on the thickness direction X of the first wall, i.e., the center of the projection of the first exhaust hole 2111a on the thickness direction X of the first wall in the fan ring shape is located on the central axis of the shell 21. It should be noted that the fan ring shape is the shape of a part of a circular ring structure cut by a fan shape.

[0225] In the embodiment, by setting the shape of the first exhaust hole 2111a to be a fan ring shape extending along the circumference of the shell 21, on the one hand, it is convenient to process and form the plurality of first exhaust holes 2111a arranged around the central axis of the shell 21 at intervals on the first wall 211, which is conducive to reducing the difficulty of arranging the plurality of first exhaust holes 2111a on the first wall 211, and on the other hand, the layout of the plurality of first exhaust holes 2111a on the first wall 211 can be optimized, and the exhaust area of the first exhaust hole 2111a can be maximized under the same area, so as to further improve the rate at which the first exhaust hole 2111a guides the exhaust in the accommodation cavity 2121 to the blocking member 23.

[0226] According to some embodiments of the present application, as shown in FIGS. 5, 6, 8 and 9, the electrode assembly 22 has a central through hole 224 extending along the thickness direction X of the first wall, and the central through hole 224 penetrates both ends of the main body part 221 in the thickness direction X of the first wall. The plurality of exhaust holes 2111 further includes a second exhaust hole 2111b, and the plurality of first exhaust holes 2111a are arranged around the second exhaust hole 2111b. In the thickness direction X of the first wall, at least part of the projection of the second exhaust hole 2111b is located in the central through hole 224.

[0227] The main body part 221 of the electrode assembly 22 is in a cylindrical shape, and the central axis of the central through hole 224 coincides with the central axis of the main body part 221 of the electrode assembly 22. Exemplarily, the projection of the second exhaust hole 2111b on the thickness direction X of the first wall is in a circular shape, and the center of the projection of the second exhaust hole 2111b on the thickness direction X of the first wall is located on the central axis of the central through hole 224, that is, the center of the projection of the second exhaust hole 2111b on the thickness direction X of the first wall is concentrically arranged with the center of the projection of the first wall 211 on the thickness direction X of the first wall.

[0228] Exemplarily, the whole of the projection of the second exhaust hole 2111b on the thickness direction X of the first wall is located in the central through hole 224. Of course, in other embodiments, the whole of the projection of the central through hole 224 on the thickness direction X of the first wall can be located in the second exhaust hole 2111b, and the projection of the central through hole 224 on the thickness direction X of the first wall can also be partially overlapped with the projection of the second exhaust hole 2111b on the thickness direction X of the first wall.

[0229] In this embodiment, by arranging the second exhaust hole 2111b on the first wall 211, the plurality of first exhaust holes 2111a are arranged around the second exhaust hole 2111b, and at least part of the projection of the second exhaust hole 2111b on the thickness direction X of the first wall is located in the central through hole 224 of the electrode assembly 22. The battery monomer 20 adopting this structure can further increase the exhaust area of the exhaust hole 2111 on the first wall 211, and can effectively optimize the layout of the first exhaust hole 2111a and the second exhaust hole 2111b in the plurality of exhaust holes 2111. On the other hand, it can also realize that the exhaust produced by the battery monomer 20 in the thermal runaway enters the second exhaust hole 2111b from the central through hole 224 of the electrode assembly 22 and then passes through the plugging member 23 for discharge, thereby facilitating further improving the rate at which the exhaust hole 2111 guides the exhaust in the containing cavity 2121 to the plugging member 23, to improve the timeliness and rate of pressure relief of the battery monomer 20.

[0230] According to some embodiments of the present application, referring to FIGS. 4, 5 and 6, the first electrode lead-out part 222 includes a first tab 2221 and a first current collecting member 2222. The first tab 2221 is connected to one end of the main body part 221 close to the first wall 211 in the thickness direction X of the first wall. The first current collecting member 2222 is arranged between the first tab 2221 and the first wall 211 in the thickness direction X of the first wall. The first current collecting member 2222 is connected to the first tab 2221, and the first current collecting member 2222 is welded to the first wall 211 and forms a first connecting part 24.

[0231] The first tab 2221 is connected to the main body 221 at one end of the first wall 211 in the thickness direction X of the first wall. The first current collecting member 2222 is arranged between the first tab 2221 and the first wall 211 in the thickness direction X of the first wall, that is, the main body 221, the first tab 2221, the first current collecting member 2222, and the first wall 211 are sequentially arranged in the thickness direction X of the first wall, so that the tab of the electrode assembly 22 is connected to the first wall 211 through the first current collecting member 2222, and the first current collecting member 2222 and the first wall 211 are welded to form the first connecting portion 24.

[0232] Optionally, the connection structure between the first tab 2221 and the first current collecting member 2222 can be various, such as welding connection or abutment, etc.

[0233] In the embodiment, the first electrode lead-out portion 222 is provided with the first tab 2221 and the first current collecting member 2222, the first tab 2221 is connected to the main body 221, and the first current collecting member 2222 is connected to the first tab 2221 and welded to the first wall 211 to form the first connecting portion 24, so that the first tab 2221 of the electrode assembly 22 is welded to the first wall 211 through the first current collecting member 2222, thereby reducing the difficulty of electrical connection between the electrode assembly 22 and the first wall 211, and reducing the welding difficulty between the first electrode lead-out portion 222 and the first wall 211, thereby facilitating the assembly efficiency of the battery monomer 20.

[0234] According to some embodiments of the present application, as shown in FIGS. 6 and 12, the first current collecting member 2222 is welded to the first tab 2221 to form the second connecting portion 2223.

[0235] The second connecting portion 2223 is a welding mark formed by the welding connection of the first current collecting member 2222 and the first tab 2221.

[0236] In the embodiment, the first current collecting member 2222 and the first tab 2221 are connected by welding, which is conducive to improving the connection stability between the first current collecting member 2222 and the first tab 2221, thereby reducing the risk of mutual separation of the first current collecting member 2222 and the first tab 2221 during use, thereby improving the use reliability and stability of the battery monomer 20.

[0237] In some embodiments, as shown in FIG. 12, the projection of the second connecting portion 2223 does not overlap the projection of the first connecting portion 24 in the thickness direction X of the first wall.

[0238] In the present embodiment, the first connecting portion 24 formed by the welding connection of the first current collecting member 2222 and the first wall 211 and the second connecting portion 2223 formed by the welding connection of the first current collecting member 2222 and the first tab 2221 are arranged in a structure in which the projections thereof in the thickness direction X of the first wall do not overlap, so that the interference between the first connecting portion 24 and the second connecting portion 2223 can be reduced, and the phenomenon of the welding pool of the first current collecting member 2222 and the first wall 211 and the welding pool of the first current collecting member 2222 and the first tab 2221 overlapping each other can be alleviated, thereby facilitating the improvement of the welding quality between the first current collecting member 2222 and the first wall 211 and between the first current collecting member 2222 and the first tab 2221.

[0239] According to some embodiments of the present application, referring to FIGS. 8, 9 and 12, the first wall 211 is provided with exhaust holes 2111 in communication with the accommodation cavity 2121, the exhaust holes 2111 penetrating the first wall 211 in the thickness direction X of the first wall. In the thickness direction X of the first wall, the projection of the at least one second connecting portion 2223 is located within one exhaust hole 2111.

[0240] In the thickness direction X of the first wall, the projection of the at least one second connecting portion 2223 is located within one exhaust hole 2111, that is, the projection of one second connecting portion 2223 in the thickness direction X of the first wall can be located within one exhaust hole 2111, or the projections of multiple second connecting portions 2223 in the thickness direction X of the first wall can all be located within one exhaust hole 2111.

[0241] Exemplarily, in FIG. 12, each second connecting portion 2223 is arranged in correspondence with one exhaust hole 2111 in the thickness direction X of the first wall, so that the whole of the projection of each second connecting portion 2223 in the thickness direction X of the first wall is located within one exhaust hole 2111.

[0242] In the embodiment, the first wall 211 is provided with an exhaust hole 2111 penetrating through two sides of the first wall 211 along the thickness direction X of the first wall, and at least one second connecting portion 2223 formed by welding connection of the first current collecting member 2222 and the first tab 2221 is arranged such that the projection of the second connecting portion 2223 on the thickness direction X of the first wall is located in the exhaust hole 2111. With the structure, on one hand, the exhaust hole 2111 can play a certain avoiding role for the second connecting portion 2223, which is beneficial to reduce the interference between the second connecting portion 2223 and the first wall 211, and on the other hand, the electrode assembly 22 can be assembled into the shell 21 first, and then the first current collecting member 2222 and the first tab 2221 are welded and connected from the exhaust hole 2111, so that the welding assembly between the first current collecting member 2222 and the first tab 2221 is not limited by the assembly sequence of the electrode assembly 22 and the shell 21, thereby the assembly process of the battery monomer 20 can be optimized, and after the first current collecting member 2222 and the first tab 2221 are welded and connected from the exhaust hole 2111, the first current collecting member 2222 and the first wall 211 can be welded and connected, which is beneficial to improve the assembly efficiency of the battery monomer 20.

[0243] According to some embodiments of the present application, as shown in FIG. 12, the first current collecting member 2222 is welded and connected with the first wall 211 to form a plurality of first connecting portions 24, and the first current collecting member 2222 is welded and connected with the first tab 2221 to form a plurality of second connecting portions 2223. The plurality of first connecting portions 24 and the plurality of second connecting portions 2223 are alternately and spacedly arranged along the circumferential direction of the first current collecting member 2222.

[0244] The plurality of first connecting portions 24 and the plurality of second connecting portions 2223 are alternately and spacedly arranged along the circumferential direction of the first current collecting member 2222, that is, one second connecting portion 2223 is arranged between every two adjacent first connecting portions 24 in the circumferential direction of the first current collecting member 2222, and vice versa.

[0245] For example, the battery monomer 20 is in a cylindrical shape, and the central axis of the battery monomer 20 extends along the thickness direction X of the first wall. Correspondingly, the projection of the first current collecting member 2222 on the thickness direction X of the first wall is circular, and the plurality of first connecting portions 24 and the plurality of second connecting portions 2223 are alternately and spacedly arranged along the circumferential direction of the first current collecting member 2222 and around the central axis of the battery monomer 20.

[0246] Exemplarily, in FIG. 12, the first current collecting component 2222 is welded to the first wall 211 and forms four first connecting portions 24, and the first current collecting component 2222 is welded to the first tab 2221 and forms four second connecting portions 2223, each of the first connecting portions 24 and each of the second connecting portions 2223 is a structure extending in the radial direction of the first current collecting component 2222, and the four first connecting portions 24 and the four second connecting portions 2223 are alternately and spaced arranged along the circumferential direction of the first current collecting component 2222 and around the central axis of the battery cell 20.

[0247] In the present embodiment, by welding the first current collecting component 2222 to the first wall 211 and forming a plurality of first connecting portions 24, the connection reliability between the first current collecting component 2222 and the first wall 211 is further improved, and by welding the first current collecting component 2222 to the first tab 2221 and forming a plurality of second connecting portions 2223, the connection reliability between the first current collecting component 2222 and the first tab 2221 is further improved. By arranging the plurality of first connecting portions 24 and the plurality of second connecting portions 2223 alternately and spaced along the circumferential direction of the first current collecting component 2222, on the one hand, the interference between the first connecting portions 24 and the second connecting portions 2223 is reduced, so as to alleviate the phenomenon that the welding pool of the first current collecting component 2222 and the first wall 211 and the welding pool of the first current collecting component 2222 and the first tab 2221 overlap each other, and the welding quality between the first current collecting component 2222 and the first wall 211 and between the first current collecting component 2222 and the first tab 2221 is improved, on the other hand, the uniformity of current flow between the first tab 2221 and the first current collecting component 2222 and between the first current collecting component 2222 and the first wall 211 is improved, and the overcurrent capacity and overcurrent effect between the first tab 2221 and the first current collecting component 2222 and between the first current collecting component 2222 and the first wall 211 are improved.

[0248] According to some embodiments of the present application, referring to FIGS. 4, 5 and 12, the first tab 2221 is a cylindrical structure extending along the thickness direction X of the first wall along the central axis, and the second connecting portion 2223 extends in the radial direction of the first tab 2221. In the radial direction of the first tab 2221, the size of the first tab 2221 is L1, and the size of the second connecting portion 2223 is L2, 0.5≤L2 / L1≤1.

[0249] The battery monomer 20 is in a cylindrical shape, and the central axis of the battery monomer 20 extends along the thickness direction X of the first wall. Correspondingly, the main body part 221 of the electrode assembly 22 is also in a cylindrical shape with the central axis extending along the thickness direction X of the first wall. The first tab 2221 is formed at one end of the main body part 221, and the first tab 2221 is also in a cylindrical shape with the central axis extending along the thickness direction X of the first wall. The first tab 2221 and the first current collecting member 2222 are welded to form a plurality of second connecting parts 2223. The plurality of second connecting parts 2223 are arranged in a structure spaced along the circumferential direction of the first tab 2221, and each second connecting part 2223 extends along the radial direction of the first tab 2221.

[0250] L1 is the diameter of the first tab 2221, and L2 is the length of the second connecting part 2223 in the radial direction of the first tab 2221. For example, L2 / L1 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or 1, etc.

[0251] In this embodiment, by setting the size of the second connecting part 2223 in the radial direction of the first tab 2221 to be greater than half or more than half of the size of the first tab 2221 in the radial direction of the first tab 2221, each ring of the first tab 2221 from the inside to the outside can form a welding relationship with the first current collecting member 2222. Thus, the overcurrent path inside the electrode assembly 22 can be shortened, and the overcurrent effect inside the electrode assembly 22 can be improved to reduce the internal resistance of the electrode assembly 22 during use, thereby facilitating the improvement of the use performance and use stability of the battery monomer 20.

[0252] According to some embodiments of the present application, as shown in FIGS. 6, 7, and 8, along the thickness direction X of the first wall 211, the first wall 211 has a fourth surface 2114 away from the electrode assembly 22, which is the surface of the first wall 211 farthest away from the electrode assembly 22. The fourth surface 2114 is provided with a fitting groove 2115, and the first electrode lead-out part 222 is welded to the groove bottom wall of the fitting groove 2115 to form the first connecting part 24. At least part of the plugging piece 23 is arranged in the fitting groove 2115.

[0253] The fourth surface 2114 is the outer surface of the first wall 211 farthest away from the electrode assembly 22 in the thickness direction X of the first wall. The fourth surface 2114 is provided with a fitting groove 2115, i.e., part of the fourth surface 2114 is recessed in the direction close to the electrode assembly 22 to form the fitting groove 2115.

[0254] The first electrode lead-out portion 222 is welded to the bottom wall of the assembly groove 2115 to form the first connection portion 24, that is, the projection of the first connection portion 24 formed by the mutual welding of the first electrode lead-out portion 222 and the first wall 211 in the thickness direction X of the first wall is located on the bottom surface of the assembly groove 2115.

[0255] At least part of the blocking member 23 is arranged in the assembly groove 2115, that is, the blocking member 23 can be partially arranged in the assembly groove 2115 in the thickness direction X of the first wall, or the entire blocking member 23 can be arranged in the assembly groove 2115 in the thickness direction X of the first wall.

[0256] It should be noted that in the embodiment in which the first wall 211 is provided with the exhaust hole 2111, the exhaust hole 2111 is arranged on the bottom surface of the assembly groove 2115.

[0257] In the present embodiment, by arranging the assembly groove 2115 on the fourth surface 2114 of the first wall 211 away from the electrode assembly 22, the bottom wall of the assembly groove 2115 is welded to the first electrode lead-out portion 222 to form the first connection portion 24, and at least part of the blocking member 23 in the thickness direction X of the first wall is arranged in the assembly groove 2115, thereby on the one hand facilitating the covering and sealing of the first connection portion 24 by the blocking member 23, which is conducive to reducing the difficulty of covering and sealing the first connection portion 24 by the blocking member 23 and can improve the effect of covering and sealing the first connection portion 24 by the blocking member 23, and on the other hand the assembly groove 2115 can also play a certain assembly positioning and protection role for the blocking member 23, which can effectively reduce the assembly difficulty between the blocking member 23 and the first wall 211, is conducive to improving the assembly efficiency of the blocking member 23 and the first wall 211, and can effectively reduce the phenomenon of wear and tear of the blocking member 23 during use, which is conducive to improving the service life of the blocking member 23.

[0258] In some embodiments, referring to FIG. 6, along the thickness direction X of the first wall, the blocking member 23 does not exceed the fourth surface 2114. That is, the blocking member 23 is arranged in the assembly groove 2115 in the thickness direction X of the first wall as a whole.

[0259] In the present embodiment, by arranging the blocking member 23 to not exceed the fourth surface 2114 in the thickness direction X of the first wall, the blocking member 23 is arranged in the assembly groove 2115 in the thickness direction X of the first wall as a whole, thereby further improving the protection effect of the assembly groove 2115 on the blocking member 23 to further reduce the phenomenon of wear and tear of the blocking member 23 during use.

[0260] According to some embodiments of the present application, referring to FIGS. 6 and 7, the first wall 211 further has a fifth surface 2116 facing the electrode assembly 22 along the thickness direction X of the first wall 211, and a second protrusion 2117 is formed on the fifth surface 2116 corresponding to the position of the assembly groove 2115 on the side of the first wall 211 facing the electrode assembly 22.

[0261] For example, the assembly groove 2115 provided on the fourth surface 2114 of the first wall 211 is a structure formed by a stamping process to form the assembly groove 2115 on the side of the first wall 211 away from the electrode assembly 22 and the second protrusion 2117 on the side of the first wall 211 facing the electrode assembly 22 corresponding to the position of the assembly groove 2115. Of course, the processing method of the assembly groove 2115 provided on the fourth surface 2114 of the first wall 211 is not limited to this, and in other embodiments, the assembly groove 2115 provided on the fourth surface 2114 of the first wall 211 can also be formed by a casting or milling process.

[0262] In this embodiment, by forming the second protrusion 2117 protruding from the fifth surface 2116 on the side of the first wall 211 facing the electrode assembly 22 corresponding to the position of the assembly groove 2115, the assembly groove 2115 on the fourth surface 2114 of the first wall 211 is a structure that can be formed by a stamping process to form the assembly groove 2115 and the second protrusion 2117 on both sides of the first wall 211, thereby effectively reducing the difficulty of forming the first wall 211 of the shell 21 to improve the production efficiency of the battery monomer 20.

[0263] According to some embodiments of the present application, referring to FIG. 6, the outer circumferential surface of the plugging member 23 is welded to the groove side surface of the assembly groove 2115 to form a third connection portion 28, and the third connection portion 28 is an annular structure.

[0264] The third connection portion 28 is a welding mark formed by the outer circumferential surface of the plugging member 23 and the groove side surface of the assembly groove 2115 being welded to each other.

[0265] The third connection portion 28 is an annular structure, that is, the third connection portion 28 is an annular structure arranged around the plugging member 23 along the circumferential direction of the plugging member 23.

[0266] In the embodiment, the outer circumferential surface of the blocking piece 23 and the groove side surface of the assembly groove 2115 are welded to each other to form the third connecting part 28 surrounding the blocking piece 23, so that the sealing connection between the blocking piece 23 and the first wall 211 is realized through the third connecting part 28. With the battery monomer 20 adopting the structure, on the one hand, the connection stability between the blocking piece 23 and the first wall 211 can be improved, the risk of the blocking piece 23 being separated in use can be reduced, and the difficulty of the sealing connection between the blocking piece 23 and the first wall 211 can be reduced, so that the assembly efficiency of the blocking piece 23 and the first wall 211 is improved. On the other hand, the structure that the outer circumferential surface of the blocking piece 23 and the groove side surface of the assembly groove 2115 are welded to each other to form the sealing connection can improve the effect of the sealing connection between the blocking piece 23 and the first wall 211, and can reduce the influence of the third connecting part 28 on the air tightness of the battery monomer 20.

[0267] According to some embodiments of the application, as shown in FIGS. 6, 7 and 8, the assembly groove 2115 includes a first groove 2115a and a second groove 2115b, the first groove 2115a is arranged on the fourth surface 2114, and the second groove 2115b is arranged on the groove bottom surface of the first groove 2115a. The first electrode lead-out part 222 is welded to the groove bottom wall of the second groove 2115b to form the first connecting part 24, and the outer circumferential surface of the blocking piece 23 is welded to the groove side surface of the second groove 2115b to form the third connecting part 28.

[0268] The assembly groove 2115 includes a first groove 2115a and a second groove 2115b, the first groove 2115a is arranged on the fourth surface 2114, and the second groove 2115b is arranged on the groove bottom surface of the first groove 2115a, that is, the assembly groove 2115 is a two-stage stepped groove structure including the first groove 2115a and the second groove 2115b.

[0269] The first electrode lead-out part 222 is welded to the groove bottom wall of the second groove 2115b to form the first connecting part 24, that is, the projection of the first connecting part 24 formed by the mutual welding connection between the first electrode lead-out part 222 and the first wall 211 in the thickness direction X of the first wall is located on the groove bottom surface of the second groove 2115b.

[0270] In the embodiment, the assembly groove 2115 includes a first groove 2115a arranged on the fourth surface 2114 and a second groove 2115b arranged on the groove bottom surface of the first groove 2115a, so that the assembly groove 2115 is a stepped groove structure arranged along the thickness direction X of the first wall. By welding the groove bottom wall of the second groove 2115b and the first electrode lead-out portion 222 to form the first connecting portion 24, and welding the outer circumferential surface of the plugging member 23 and the groove side surface of the second groove 2115b to form the annular third connecting portion 28, on the one hand, the plugging member 23 can cover and seal the first connecting portion 24, which is beneficial to reduce the difficulty of covering and sealing the first connecting portion 24 by the plugging member 23 and improve the covering and sealing effect of the first connecting portion 24 by the plugging member 23. On the other hand, the first groove 2115a can also accommodate and protect the part of the third connecting portion 28 protruding from the groove bottom surface of the first groove 2115a, which is beneficial to reduce the interference between the third connecting portion 28 and other components and reduce the phenomenon of bumping and wear of the third connecting portion 28 during use.

[0271] In some embodiments, referring to FIG. 6, along the thickness direction X of the first wall, the third connecting portion 28 does not protrude beyond the fourth surface 2114. That is, the part of the third connecting portion 28 protruding from the groove bottom surface of the first groove 2115a is located in the first groove 2115a and does not protrude beyond the groove opening of the first groove 2115a.

[0272] In the embodiment, by arranging the third connecting portion 28 in the thickness direction X of the first wall to not protrude beyond the fourth surface 2114, the part of the third connecting portion 28 protruding from the groove bottom surface of the first groove 2115a is located in the first groove 2115a, which can further improve the protection effect of the first groove 2115a on the third connecting portion 28, further reduce the interference between the third connecting portion 28 and other components, and further reduce the phenomenon of bumping and wear of the third connecting portion 28 during use.

[0273] In some embodiments, referring to FIGS. 6 and 10, along the thickness direction X of the first wall, the plugging member 23 has a second surface 233 facing away from the electrode assembly 22, the second surface 233 is connected to the outer circumferential surface of the plugging member 23, and the second surface 233 is coplanar with the groove bottom surface of the first groove 2115a, that is, the second surface 233 of the plugging member 23 is flush with the groove bottom surface of the first groove 2115a.

[0274] In this embodiment, by setting the second surface 233 of the sealing member 23 on the side opposite to the electrode assembly 22 and connected to the outer peripheral surface of the sealing member 23 to be coplanar with the bottom surface of the first groove 2115a, the second surface 233 of the sealing member 23 and the bottom surface of the first groove 2115a are flush with each other, thereby further improving the welding quality between the outer peripheral surface of the sealing member 23 and the side surface of the second groove 2115b, so as to improve the assembly quality between the sealing member 23 and the first wall 211.

[0275] In some embodiments, as shown in FIG6, the sealing member 23 abuts against the bottom surface of the second groove 2115b along the thickness direction X of the first wall.

[0276] In this embodiment, by setting the sealing member 23 to abut against the bottom surface of the second groove 2115b in the thickness direction X of the first wall, the bottom surface of the second groove 2115b can also provide some support and positioning for the sealing member 23. On the one hand, this can further improve the welding quality between the sealing member 23 and the first wall 211, which is conducive to further improving the assembly quality and assembly stability of the sealing member 23 and the first wall 211. On the other hand, it can further reduce the assembly difficulty between the sealing member 23 and the first wall 211, thereby improving the assembly efficiency of the sealing member 23 and the first wall 211.

[0277] According to some embodiments of this application, as shown in Figures 6, 7, 8 and 12, the bottom surface of the assembly groove 2115 is provided with a second groove 2118, and the projection of the first connecting portion 24 is located in the second groove 2118 along the thickness direction X of the first wall.

[0278] The second groove 2118 is disposed on the bottom surface of the assembly groove 2115, that is, a local area of ​​the bottom surface of the assembly groove 2115 is recessed towards the electrode assembly 22 to form the second groove 2118. It should be noted that in the embodiment where the assembly groove 2115 includes the first groove 2115a and the second groove 2115b, the second groove 2118 is disposed on the bottom surface of the second groove 2115b.

[0279] Along the thickness direction X of the first wall, the projection of the first connecting part 24 is located in the second groove 2118. That is, the bottom wall of the second groove 2118 is welded to the first electrode lead-out part 222 to form the first connecting part 24.

[0280] In the present embodiment, by arranging the second groove 2118 on the groove bottom surface of the assembly groove 2115, and the projection of the first connecting portion 24 formed by the welding connection between the first electrode lead-out portion 222 and the groove bottom wall of the assembly groove 2115 in the thickness direction X of the first wall is located within the second groove 2118, so that the first connecting portion 24 is arranged in a structure in which the groove bottom wall of the second groove 2118 and the first electrode lead-out portion 222 are weldedly connected. The battery monomer 20 adopting such a structure can on one hand facilitate the covering and sealing of the first connecting portion 24 by the blocking member 23, and is beneficial to reducing the difficulty of covering and sealing the first connecting portion 24 by the blocking member 23, and can improve the effect of covering and sealing the first connecting portion 24 by the blocking member 23, and on the other hand can accommodate the part of the first connecting portion 24 protruding from the groove bottom surface of the second groove 2118, which is beneficial to reducing the interference between the first connecting portion 24 and the blocking member 23 arranged in the assembly groove 2115.

[0281] In some embodiments, referring to FIG. 6, along the thickness direction X of the first wall, the blocking member 23 covers the second groove 2118, that is, the projection of the second groove 2118 in the thickness direction X of the first wall is located within the blocking member 23.

[0282] In the present embodiment, by arranging the blocking member 23 to cover the second groove 2118 in the thickness direction X of the first wall, the covering of the first connecting portion 24 by the blocking member 23 is facilitated, and the effect of covering and sealing the first connecting portion 24 by the blocking member 23 can be improved.

[0283] According to some embodiments of the present application, referring to FIGS. 6 and 7, along the thickness direction X of the first wall, the groove bottom wall of the assembly groove 2115 has a third surface 2112 facing the electrode assembly 22, the groove bottom wall of the assembly groove 2115 has a side facing the electrode assembly 22 and corresponding to the position of the second groove 2118, and a protruding portion 2113 protruding from the third surface 2112 is formed at the position, and the protruding portion 2113 is weldedly connected with the first electrode lead-out portion 222 and forms the first connecting portion 24.

[0284] The third surface 2112 is a surface of the side of the groove bottom wall of the assembly groove 2115 facing the electrode assembly 22 in the thickness direction X of the first wall. For example, in FIG. 7, the fourth surface 2114 of the first wall 211 is provided with the assembly groove 2115, the side of the first wall 211 facing the electrode assembly 22 is formed with the second protrusion 2117 protruding from the fifth surface 2116 at a position corresponding to the assembly groove 2115, and the third surface 2112 is a surface of the side of the second protrusion 2117 facing the electrode assembly 22 in the thickness direction X of the first wall. If the side of the first wall 211 facing the electrode assembly 22 is not provided with the second protrusion 2117 protruding from the fifth surface 2116, the third surface 2112 is the same surface as the fifth surface 2116.

[0285] The groove bottom wall of the assembly groove 2115 is formed with the protruding portion 2113 protruding from the third surface 2112 at a position corresponding to the second groove 2118, that is, the second protrusion 2117 is provided with the protruding portion 2113 protruding from the third surface 2112 at a position corresponding to the second groove 2118 in the thickness direction X of the first wall, so that the groove bottom wall of the second groove 2118 is in a structure protruding from the third surface 2112, and the first wall 211 is in a structure in which the protruding portion 2113 is welded to the first electrode lead portion 222 to form the first connecting portion 24.

[0286] In this embodiment, by forming the protruding portion 2113 protruding from the third surface 2112 at a position corresponding to the second groove 2118 on the side of the groove bottom wall of the second groove 2118 facing the electrode assembly 22, and the protruding portion 2113 is used for welding connection with the first electrode lead portion 222 to form the first connecting portion 24, the battery monomer 20 with this structure enables the part of the first wall 211 used for welding connection with the first electrode lead portion 222 to have sufficient contact with the first electrode lead portion 222, which is beneficial to improve the contact effect of the part of the first wall 211 used for welding connection with the first electrode lead portion 222, thereby on the one hand, reducing the welding difficulty between the first wall 211 and the first electrode lead portion 222, and on the other hand, effectively reducing the phenomenon of false welding between the first wall 211 and the first electrode lead portion 222 during welding assembly, so as to improve the welding quality of the first wall 211 and the first electrode lead portion 222.

[0287] According to some embodiments of the present application, referring to FIGS. 3, 4 and 5, the shell 21 can include a housing 212 and an end cover 213. The housing 212 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, and the other end of the side wall is closed to form an opening 2122. The side wall and the bottom wall jointly define a containing cavity 2121. The end cover 213 closes the opening 2122, and the bottom wall is the first wall 211.

[0288] The bottom wall is the first wall 211, that is, the first electrode lead-out part 222 is connected to one end of the main body part 221 on the first wall in the thickness direction X and faces the bottom wall of the shell 212 and is welded to the bottom wall of the shell 212 to form the first connecting part 24, and the plugging part 23 is arranged on the side of the bottom wall of the shell 212 away from the electrode assembly 22.

[0289] The shell 212 includes an integrally formed side wall and bottom wall, that is, the side wall and bottom wall of the shell 212 are formed by an integral forming process, such as a stamping process or a casting process, to form the accommodating cavity 2121 with the opening 2122 in the interior of the shell 212.

[0290] In this embodiment, by arranging the first wall 211 of the shell 21 as the bottom wall of the shell 212 opposite to the end cover 213 in the thickness direction X of the first wall, the battery monomer 20 with this structure can make the first wall 211 welded to the first electrode lead-out part 222 and form the first connecting part 24 away from the end cover 213, so that there is no direct connection relationship between the first wall 211 and the end cover 213, thereby being able to alleviate the influence of the stress generated when the end cover 213 and the shell 212 are assembled and connected on the first connecting part 24, and being beneficial to improve the welding quality of the first wall 211 and the first electrode lead-out part 222, so as to improve the production quality of the battery monomer 20.

[0291] Of course, the structure of the battery monomer 20 is not limited to this, and in some embodiments, the battery monomer 20 can also have other structures, for example, the shell 21 can include the shell 212 and the end cover 213, the interior of the shell 212 forms the accommodating cavity 2121, the accommodating cavity 2121 forms the opening 2122 at one end of the shell 212, and the end cover 213 closes the opening 2122. The end cover 213 is the first wall 211, that is, the first electrode lead-out part 222 is connected to one end of the main body part 221 on the first wall in the thickness direction X and faces the end cover 213 and is welded to the end cover 213 to form the first connecting part 24, and the plugging part 23 is arranged on the side of the end cover 213 away from the electrode assembly 22.

[0292] In this embodiment, by arranging the first wall 211 of the shell 21 as the end cover 213 used to close the opening 2122 of the shell 212, the battery monomer 20 with this structure facilitates the assembly of the plugging part 23 on the end cover 213, and can reduce the welding difficulty between the first electrode lead-out part 222 and the first wall 211, thereby being beneficial to reduce the assembly difficulty of the battery monomer 20, so as to improve the production efficiency of the battery monomer 20.

[0293] According to some embodiments of the present application, the present application also provides a battery 100 including the battery monomer 20 of any of the above schemes.

[0294] The battery 100 can further include a case 10 in which the battery cells 20 are accommodated, as shown in FIG. 2.

[0295] In some embodiments, the case 10 can include a first case body 11 and a second case body 12, the first case body 11 and the second case body 12 being coupled to each other, and the first case body 11 and the second case body 12 together defining an assembly space for accommodating the battery cells 20.

[0296] Alternatively, the second case body 12 can be a hollow structure with one end open, and the first case body 11 can be a plate structure, the first case body 11 being coupled to the open end of the second case body 12 to define the assembly space together with the second case body 12. Alternatively, the first case body 11 and the second case body 12 can both be hollow structures with one end open, the open end of the first case body 11 being coupled to the open end of the second case body 12.

[0297] Of course, the case 10 formed by the first case body 11 and the second case body 12 can have various shapes, such as a cylinder or a cuboid. For example, in FIG. 2, the case 10 has a cuboid structure.

[0298] Alternatively, the battery cells 20 accommodated in the case 10 can be one or multiple. For example, in FIG. 2, the case 10 of the battery 100 accommodates multiple battery cells 20, which can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the multiple battery cells 20 is accommodated in the case 10. Of course, the battery 100 can also be in the form of a battery module in which the multiple battery cells 20 are connected in series, in parallel, or in a mixed manner, and the multiple battery modules are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the case 10.

[0299] The battery 100 can further include other structures, for example, the battery 100 can further include a current collecting member for connecting the multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0300] It should be noted that in some embodiments, the battery 100 can also not be provided with the box 10, the battery 100 includes a plurality of battery monomers 20, and the battery 100 composed of the plurality of battery monomers 20 can be directly assembled to the electric device to provide electric energy for the electric device by the plurality of battery monomers 20. That is, the box 10 can be part of the electric device. Taking the vehicle 1000 as an example of the electric device, the box 10 can be part of the chassis structure of the vehicle 1000, for example, part of the box 10 can become at least part of the floor of the vehicle 1000, or part of the box 10 can become at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0301] According to some embodiments of the present application, the present application also provides an electric device, the electric device includes the battery monomer 20 of any one of the above solutions, and the battery monomer 20 is used to provide electric energy for the electric device.

[0302] Among them, the electric device can be the device or system of the above-mentioned any application battery monomer 20.

[0303] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0304] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, comprising: a housing having a receiving cavity formed inside, the housing having a first wall; an electrode assembly received in the receiving cavity, the electrode assembly including a main body portion and a first electrode lead-out portion connected to an end of the main body portion close to the first wall in a thickness direction of the first wall, the first electrode lead-out portion being welded to the first wall and forming a first connecting portion; and a blocking member disposed on a side of the first wall away from the electrode assembly, the blocking member being sealingly connected to the first wall, and the blocking member covering the first connecting portion in the thickness direction of the first wall.

2. The battery cell of claim 1, wherein, The first wall is provided with a vent hole communicating with the receiving cavity, the vent hole penetrating through the first wall in the thickness direction of the first wall; wherein the blocking member is configured to be able to release the internal pressure of the battery cell.

3. The battery cell of claim 2, wherein, The blocking member and the first wall jointly define a vent cavity, and the vent hole communicates the vent cavity and the receiving cavity.

4. The battery cell of claim 3, wherein, In the thickness direction of the first wall, the blocking member has a first surface facing the electrode assembly, and the first surface abuts against the first wall; wherein the first surface is provided with a first groove, and a groove wall surface of the first groove jointly defines the vent cavity with the first wall.

5. The battery cell of claim 4, wherein, In the thickness direction of the first wall, the blocking member has a second surface away from the electrode assembly, and a first protrusion is formed on a side of the blocking member away from the electrode assembly and corresponding to a position of the first groove, the first protrusion protruding from the second surface.

6. The battery cell of claim 4 or 5, wherein, The blocking member is provided with a pressure relief groove, and the blocking member is configured to be able to split along at least part of the pressure relief groove to release the internal pressure of the battery cell when the battery cell is relieved of pressure; wherein, in the thickness direction of the first wall, a projection of the pressure relief groove is located in the first groove.

7. The battery cell of claim 6, wherein, In the thickness direction of the first wall, the pressure relief groove is disposed on a side of the blocking member away from the electrode assembly.

8. The battery cell of any one of claims 2-7, wherein, The first electrode lead-out portion includes a first tab and a first current collecting member, and in the thickness direction of the first wall, the first tab is connected to an end of the main body portion close to the first wall, the first current collecting member is disposed between the first tab and the first wall, the first current collecting member is connected to the first tab, and the first current collecting member is welded to the first wall and forms the first connecting portion; wherein the first current collecting member is provided with a through hole penetrating through both sides of the first current collecting member in the thickness direction of the first wall, and the through hole communicates with the vent hole.

9. The battery cell of claim 8, wherein, In the thickness direction of the first wall, at least part of a projection of at least one of the through holes is located in one of the vent holes.

10. The battery cell of any one of claims 2-9, wherein, The first electrode lead-out portion includes a first tab and a first current collecting member, and in the thickness direction of the first wall, the first tab is connected to an end of the main body portion close to the first wall, the first current collecting member is disposed between the first tab and the first wall, the first current collecting member is connected to the first tab, and the first current collecting member is welded to the first wall and forms the first connecting portion; The first wall has a third surface facing the electrode assembly in the thickness direction of the first wall, and the first wall has a protruding portion protruding from the third surface, the protruding portion is welded to the first current collecting member and forms the first connecting portion, an exhaust gap is formed between the first current collecting member and the third surface, and the exhaust gap communicates with the exhaust hole.

11. The battery cell of any one of claims 2-10, wherein, The shell is cylindrical, and a central axis of the shell extends in the thickness direction of the first wall; The first wall is provided with a plurality of exhaust holes, and the plurality of exhaust holes includes a plurality of first exhaust holes, and the plurality of first exhaust holes are arranged at intervals around the central axis of the shell.

12. The battery cell of claim 11, wherein, The projection of the first exhaust hole in the thickness direction of the first wall is a fan ring shape extending in the circumferential direction of the shell.

13. The battery cell of claim 11 or 12, wherein, The electrode assembly has a central through hole extending in the thickness direction of the first wall, and the central through hole penetrates both ends of the main body portion in the thickness direction of the first wall; The plurality of exhaust holes further includes a second exhaust hole, and the plurality of first exhaust holes are arranged around the second exhaust hole, and at least part of the projection of the second exhaust hole is located in the central through hole in the thickness direction of the first wall.

14. The battery cell of any one of claims 1-13, wherein, The first electrode lead-out portion includes: A first tab connected to one end of the main body portion close to the first wall in the thickness direction of the first wall; A first current collecting member arranged between the first tab and the first wall in the thickness direction of the first wall, the first current collecting member is connected to the first tab, and the first current collecting member is welded to the first wall and forms the first connecting portion.

15. The battery cell of claim 14, wherein, The first current collecting member is welded to the first tab and forms a second connecting portion.

16. The battery cell of claim 15, wherein, The projection of the second connecting portion does not overlap with the projection of the first connecting portion in the thickness direction of the first wall.

17. The battery cell of claim 15 or 16, wherein, The first wall is provided with an exhaust hole communicating with the accommodation cavity, and the exhaust hole penetrates the first wall in the thickness direction of the first wall; At least one projection of the second connecting portion is located in one exhaust hole in the thickness direction of the first wall.

18. The battery cell of any one of claims 15-17, wherein, The first current collecting member is welded to the first wall and forms a plurality of first connecting portions, and the first current collecting member is welded to the first tab and forms a plurality of second connecting portions; The plurality of first connecting portions and the plurality of second connecting portions are alternately and spaced arranged in the circumferential direction of the first current collecting member.

19. The battery cell of any one of claims 15-18, wherein, The first tab is a cylindrical structure with a central axis extending in the thickness direction of the first wall, and the second connecting portion extends in the radial direction of the first tab; In the radial direction of the first tab, the size of the first tab is L1, the size of the second connecting portion is L2, and 0.5≤L2 / L1≤1.

20. The battery cell of any one of claims 1-19, wherein, The first wall has a fourth surface away from the electrode assembly in the thickness direction of the first wall, and the fourth surface is the surface of the first wall farthest away from the electrode assembly; The fourth surface is provided with an assembly groove, the first electrode lead-out portion is welded to the groove bottom wall of the assembly groove and forms the first connecting portion, and at least part of the blocking member is arranged in the assembly groove.

21. The battery cell of claim 20, wherein, In the thickness direction of the first wall, the blocking member does not exceed the fourth surface.

22. The battery cell of claim 20 or 21, wherein, In the thickness direction of the first wall, the first wall further has a fifth surface facing the electrode assembly, one side of the first wall facing the electrode assembly is formed with a second protrusion corresponding to the position of the assembly groove, and the second protrusion is protruded on the fifth surface.

23. The battery cell of any one of claims 20-22, wherein, The outer circumferential surface of the blocking member is welded to the groove side surface of the assembly groove and forms a third connecting portion, and the third connecting portion is in an annular structure.

24. The battery cell of claim 23, wherein, The assembly groove comprises a first groove and a second groove, the first groove is arranged on the fourth surface, the second groove is arranged on the groove bottom surface of the first groove, and the first electrode lead-out portion is welded to the groove bottom wall of the second groove and forms the first connecting portion. The outer circumferential surface of the blocking member is welded to the groove side surface of the second groove and forms the third connecting portion.

25. The battery cell of claim 24, wherein, In the thickness direction of the first wall, the third connecting portion does not exceed the fourth surface.

26. The battery cell of claim 24 or 25, wherein, In the thickness direction of the first wall, the blocking member has a second surface facing away from the electrode assembly, the second surface is connected to the outer circumferential surface of the blocking member, and the second surface is coplanar with the groove bottom surface of the first groove.

27. The battery cell of any one of claims 24-26, wherein, In the thickness direction of the first wall, the blocking member abuts against the groove bottom surface of the second groove.

28. The battery cell of any one of claims 20-27, wherein, The groove bottom surface of the assembly groove is provided with a second groove, and in the thickness direction of the first wall, the projection of the first connecting portion is located in the second groove.

29. The battery cell of claim 28, wherein, In the thickness direction of the first wall, the blocking member covers the second groove.

30. The battery cell of claim 28 or 29, wherein, In the thickness direction of the first wall, the groove bottom wall of the assembly groove has a third surface facing the electrode assembly, one side of the groove bottom wall of the assembly groove facing the electrode assembly is formed with a protruding portion protruding from the third surface corresponding to the position of the second groove, the protruding portion is welded to the first electrode lead-out portion and forms the first connecting portion.

31. The battery cell of any one of claims 1-30, wherein, The shell comprises: a shell body including an integrally formed side wall and a bottom wall, the side wall being arranged around the bottom wall, one end of the side wall being connected to the bottom wall in the thickness direction of the first wall, and the other end being closed to form an opening, the side wall and the bottom wall jointly defining the accommodating cavity; an end cover closing the opening; wherein the bottom wall is the first wall.

32. The battery cell of any one of claims 1-30, wherein, The shell comprises: a shell body, the accommodating cavity being formed in the shell body, and the accommodating cavity being formed with an opening at one end of the shell body; an end cover closing the opening; wherein the end cover is the first wall.

33. A battery comprising the battery cell according to any one of claims 1-32.

34. An electric device comprising the battery cell according to any one of claims 1-32, the battery cell being used to provide electric energy.

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