Battery cell, battery and electric device

Abstract

A battery cell (20), a battery (100) and an electric device. The battery cell (20) comprises a casing (21), an electrode terminal (22), an electrode assembly (23) and a first insulating member (24). The casing (21) has a wall portion (211) and a side wall (2123), with the side wall (2123) surrounding the wall portion (211). The electrode terminal (22) is disposed on the wall portion (211). The electrode assembly (23) is accommodated in the casing (21), a first tab (232) is formed at the end of the electrode assembly (23) close to the wall portion (211), and the first tab (232) is electrically connected to the electrode terminal (22). The first insulating member (24) comprises a first insulating portion (241) and a second insulating portion (242) that are connected to each other, wherein the first insulating portion (241) is located between the wall portion (211) and the first tab (232), the second insulating portion (242) surrounds the first insulating portion (241), the second insulating portion (242) and the first insulating portion (241) jointly define an accommodating space (243), and at least part of the first tab (232) is inserted into the accommodating space (243) in the direction (X) of the thickness of the wall portion (211). A groove (2123a) is provided on the inner peripheral surface of the side wall (2123), and the end of the second insulating portion (242) away from the first insulating portion (241) is inserted into the groove (2123a), so as to alleviate the phenomenon that the second insulating portion (242) scratches the electrode assembly (23) or is inserted into the electrode assembly (23).

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 2024215009826, filed on June 27, 2024, entitled “Battery cell, battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0004] New energy vehicles have made a great leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, the battery as a core component of new energy vehicles has higher requirements in terms of use performance and production quality.

[0005] 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. The tab is used to electrically connect with an electrode terminal arranged on the shell to realize the input or output of the electric energy of the battery cell. However, the existing battery cell is prone to damage to the electrode assembly during assembly, resulting in poor assembly quality and low use stability of the battery cell.

[0006] SUMMARY

[0007] The embodiments of the present application provide a battery cell, a battery and an electric device, which can effectively improve the assembly quality and use stability of the battery cell.

[0008] In a first aspect, the embodiments of the present application provide a battery monomer, comprising a shell, an electrode terminal, an electrode assembly and a first insulation piece; the shell has a wall portion and a side wall, the side wall is arranged around the wall portion; the electrode terminal is arranged on the wall portion; the electrode assembly is accommodated in the shell, the electrode assembly has a first tab, the first tab is arranged at one end of the electrode assembly close to the wall portion in the thickness direction of the wall portion, and the first tab is electrically connected with the electrode terminal; the first insulation piece comprises a first insulation portion and a second insulation portion, at least part of the first insulation portion is located between the wall portion and the first tab, the second insulation portion is arranged around the first insulation portion, and the second insulation portion and the first insulation portion jointly define an accommodation space, one end of the second insulation portion is connected with the first insulation portion in the thickness direction of the wall portion, and at least part of the first tab is inserted into the accommodation space; wherein a groove is arranged on the inner circumferential surface of the side wall, and one end of the second insulation portion away from the first insulation portion is inserted into the groove.

[0009] In the above technical solution, the first insulation piece for insulating and isolating the first tab and the shell is arranged in the shell, the first insulation piece comprises a first insulation portion and a second insulation portion, the first insulation portion is arranged between the wall portion and the first tab, the second insulation portion is arranged around the first insulation portion, and one end of the second insulation portion in the thickness direction of the wall portion is connected with the first insulation portion, so that the first insulation portion and the second insulation portion jointly form an accommodation space for the first tab, so as to realize the separation between the first tab and the wall portion and between the first tab and the side wall through the first insulation portion and the second insulation portion of the first insulation piece, which is beneficial to improve the effect of the first insulation piece insulating and isolating the first tab and the shell, thereby reducing the risk of short circuit of the battery monomer and improving the use reliability of the battery monomer, wherein by arranging the groove on the inner circumferential surface of the side wall and inserting one end of the second insulation portion away from the first insulation portion into the groove, the interference between the second insulation portion and the electrode assembly can be reduced, so that the phenomenon of the second insulation portion pressing or scratching the electrode assembly during the use of the battery monomer can be alleviated, and the phenomenon of one end of the second insulation portion away from the first insulation portion being inserted into the electrode assembly during the assembly of the battery monomer can be alleviated, thereby reducing the risk of damage to the electrode assembly and improving the assembly quality and use stability of the battery monomer.

[0010] In some embodiments, the electrode assembly comprises a first tab, the first tab comprises a first main body and the first tab, and the first tab is connected to one end of the first main body close to the wall portion in the thickness direction of the wall portion; wherein, in the thickness direction of the wall portion, one end of the second insulation portion away from the first insulation portion extends to between the first main body and the side wall, and the first tab is located in the accommodation space as a whole.

[0011] In the above technical solution, by extending the one end of the second insulation part away from the first insulation part to between the first main body and the side wall of the first pole piece, the first pole lug can be accommodated in the accommodation space as a whole, so that the projection of the first pole lug in the radial direction of the second insulation part is located in the second insulation part. Since the one end of the second insulation part away from the first insulation part is inserted into the groove, that is, the one end of the second insulation part extending to between the first main body and the side wall is inserted into the groove, the battery monomer with this structure can further improve the effect of the first insulation part insulating and isolating the first pole lug and the side wall while relieving the phenomenon that the one end of the second insulation part away from the first insulation part is inserted into the electrode assembly or scratches the electrode assembly, thereby further reducing the risk of short circuit of the battery monomer.

[0012] In some embodiments, the groove is an annular groove extending along the circumference of the side wall.

[0013] In the above technical solution, by setting the groove as an annular groove structure extending along the circumference of the side wall, the groove and the second insulation part are both annular structures, so that the one end of the second insulation part away from the first insulation part is inserted into the groove, which is beneficial to reduce the assembly difficulty between the second insulation part and the groove, thereby improving the assembly efficiency of the battery monomer.

[0014] In some embodiments, the wall thickness of the side wall is D1, and the groove depth of the groove is H, satisfying 1 / 3≤H / D1≤1 / 2.

[0015] In the above technical solution, the ratio of the groove depth of the groove to the wall thickness of the side wall is one-third to one-half. On the one hand, by setting the groove depth to be greater than or equal to one-third of the wall thickness of the side wall, the phenomenon of excessive depth of the groove provided on the inner circumferential surface of the side wall is relieved, thereby improving the wall thickness of the groove bottom wall and facilitating the improvement of the structural strength of the area of the side wall provided with the groove, so as to relieve the phenomenon of cracking or damage of the side wall during use. On the other hand, by setting the groove depth to be less than or equal to one-half of the wall thickness of the side wall, the space size of the groove for accommodating the one end of the second insulation part away from the first insulation part is improved, thereby improving the effect of the groove accommodating the one end of the second insulation part away from the first insulation part. This can effectively relieve the phenomenon of the second insulation part extruding or scratching the electrode assembly during use of the battery monomer, and effectively relieve the phenomenon of the one end of the second insulation part away from the first insulation part being inserted into the electrode assembly during assembly of the battery monomer, thereby facilitating the reduction of the risk of damage to the electrode assembly.

[0016] In some embodiments, the outer circumferential surface of the second insulation part is in interference fit with the groove bottom surface of the groove.

[0017] In the technical scheme, the outer circumferential surface of the second insulating part and the groove bottom surface of the groove are arranged in an interference fit structure, so that the first insulating part is arranged in a structure fastened in the shell, thereby improving the stability of the first insulating part in the shell, and facilitating the alleviation of the first insulating part from moving or shifting during use, so as to improve the use reliability of the battery monomer.

[0018] In some embodiments, along the thickness direction of the wall part, the second insulating part is provided with a notch at one end away from the first insulating part, and the notch penetrates the inner circumferential surface and the outer circumferential surface of the second insulating part.

[0019] In the technical scheme, the notch is arranged at one end of the second insulating part away from the first insulating part in the thickness direction of the wall part, and the notch penetrates the inner circumferential surface and the outer circumferential surface of the second insulating part, so that the second insulating part is more easily deformed in the radial direction of the second insulating part, so as to facilitate the assembly of the first insulating part into the shell, thereby reducing the difficulty of the interference fit between the second insulating part and the groove bottom surface of the groove, and reducing the difficulty of the assembly of the first insulating part into the shell, and facilitating the improvement of the assembly efficiency of the battery monomer.

[0020] In some embodiments, the second insulating part is provided with a plurality of notches, and the plurality of notches are arranged at intervals along the circumferential direction of the second insulating part.

[0021] In the technical scheme, a plurality of notches are arranged at intervals along the circumferential direction of the second insulating part, so as to further improve the deformation capability of the second insulating part in the radial direction of the second insulating part, thereby further reducing the difficulty of the interference fit between the second insulating part and the groove bottom surface of the groove, and further reducing the difficulty of the assembly of the first insulating part into the shell.

[0022] In some embodiments, the electrode assembly includes a first pole piece, a second pole piece, and a separator, the first pole piece and the second pole piece have opposite polarities, the first pole piece includes a first main body and a first tab connected to one end of the first main body close to the wall part in the thickness direction of the wall part, and part of the separator is arranged between the first pole piece and the second pole piece to separate the first pole piece and the second pole piece, and part of the separator is wrapped outside the electrode assembly; along the radial direction of the second insulating part, the projection of the notch is located in the part of the separator wrapped outside the electrode assembly, and the radial direction of the second insulating part is perpendicular to the thickness direction of the wall part.

[0023] In the technical scheme, the part of the isolation film surrounding and covering the outer side of the electrode assembly is used to insulate and separate the side wall of the shell and the first and second pole pieces, the projection of the gap on the second insulation part in the radial direction of the second insulation part is arranged in the part of the isolation film surrounding and covering the outer side of the electrode assembly, the part of the isolation film surrounding and covering the outer side of the electrode assembly is configured to cover and shield the gap in the radial direction of the second insulation part, thereby reducing the phenomenon that the first tab is overlapped with the side wall of the shell after leaking from the gap, reducing the risk of internal short circuit of the battery monomer, and improving the use reliability of the battery monomer.

[0024] In some embodiments, the electrode assembly includes a first pole piece, a second pole piece and an isolation film, the first pole piece and the second pole piece have opposite polarities, the first pole piece includes a first main body and a first tab connected to one end of the first main body close to the wall part in the thickness direction of the wall part, and a part of the isolation film is arranged between the first pole piece and the second pole piece to separate the first pole piece and the second pole piece, and a part of the isolation film surrounds the outer side of the electrode assembly; wherein, along the thickness direction of the wall part, the first tab exceeds the one end of the isolation film close to the wall part, and the part of the isolation film surrounding the outer side of the electrode assembly is inserted into the accommodation space close to the one end of the wall part.

[0025] In the technical scheme, the first tab is arranged to exceed the one end of the isolation film close to the wall part in the thickness direction of the wall part, so as to facilitate the electrical connection between the first tab and the electrode terminal, reduce the assembly difficulty between the first tab and the electrode terminal, and reduce the risk of damaging the isolation film when the first tab and the electrode terminal are assembled and connected. In addition, the part of the isolation film surrounding the outer side of the electrode assembly is arranged to be inserted into the accommodation space of the first insulation part in the thickness direction of the wall part, so that the part of the second insulation part and the part of the isolation film can overlap in the radial direction of the second insulation part, thereby improving the effect of the second insulation part of the first insulation part and the isolation film in insulating and separating the side wall of the shell and the first and second pole pieces, reducing the risk of the part of the first tab being overlapped with the side wall of the shell after being exposed, on the one hand, further improving the use reliability of the battery monomer, and on the other hand, without further surrounding an insulation film on the outer side of the electrode assembly, reducing the manufacturing cost of the battery monomer, and optimizing the production process of the battery monomer.

[0026] In some embodiments, the battery cell further comprises a first current collecting member; the first current collecting member is arranged between the first tab and the first insulating part along the thickness direction of the wall part, the first current collecting member is connected with the first tab, and the first insulating part is provided with a through hole in communication with the accommodating space, and the electrode terminal is inserted into the through hole and connected with the first current collecting member.

[0027] In the above technical solution, the first current collecting member is arranged between the first insulating part and the first tab, and the first insulating part is provided with a through hole for inserting the electrode terminal, so that the first current collecting member can connect the electrode terminal and the first tab. The battery cell with this structure can reduce the difficulty of electrically connecting the electrode terminal and the first tab, thereby reducing the assembly difficulty of the battery cell. On the other hand, the first current collecting member is also located in the accommodating space of the first insulating part, so that the first insulating part can insulate and separate the first current collecting member and the shell while insulating and separating the first tab and the shell. This is conducive to reducing the risk of short circuit between the current collecting member and the shell, thereby further reducing the risk of short circuit of the battery cell and further improving the use reliability of the battery cell.

[0028] In some embodiments, the first insulating part is connected with the first current collecting member.

[0029] In the above technical solution, the first insulating part of the first insulating member is connected with the first current collecting member, so that the first insulating member is a structure fixed on the first current collecting member. The battery cell with this structure can improve the stability of the assembly of the first insulating member into the shell, thereby alleviating the phenomenon of movement or displacement of the first insulating member during use and improving the use reliability of the battery cell. On the other hand, the first insulating member, the first current collecting member and the electrode assembly can be assembled first, and then the whole formed is assembled into the shell, thereby reducing the assembly deviation between the first insulating member and the electrode assembly, improving the assembly quality between the first insulating member and the electrode assembly, and reducing the risk of damage of the electrode assembly by the first insulating member during the assembly of the electrode assembly into the shell, thereby improving the production quality of the battery cell.

[0030] In some embodiments, the first insulating part is adhesively connected to the first current collecting member.

[0031] In the above technical solution, the first insulating part of the first insulating member is connected to the first current collecting member by adhesion, which can reduce the connection difficulty between the first insulating member and the first current collecting member, thereby improving the assembly efficiency of the battery cell. On the other hand, the connection assembly between the first insulating member and the first current collecting member does not affect the first current collecting member, thereby reducing the damage of the first current collecting member.

[0032] In some embodiments, the battery cell further comprises a second insulation member; at least part of the second insulation member is disposed between the wall portion and the first insulation portion, the second insulation member is configured to insulate and isolate the first current collecting member and the wall portion; wherein along the thickness direction of the wall portion, a limiting portion is protruded on the side of the second insulation member away from the wall portion, the limiting portion is inserted into the through hole, and the limiting portion is located between the electrode terminal and the hole wall surface of the through hole.

[0033] In the above technical solution, the second insulation member is further arranged in the shell, and at least part of the second insulation member is located between the wall portion and the first insulation portion, so that the wall portion and the first current collecting member can be further separated by the second insulation member, thereby further improving the effect of mutual insulation and isolation between the wall portion and the first current collecting member. By protruding the limiting portion on the side of the second insulation member away from the wall portion, and inserting the limiting portion into the through hole of the first insulation portion, the limiting portion of the second insulation member can also limit and position the first insulation member, which is beneficial to further reduce the phenomenon of movement or displacement of the first insulation member during use, and can improve the stability and quality of the assembly of the first insulation member into the shell.

[0034] In some embodiments, the limiting portion is arranged around the electrode terminal.

[0035] In the above technical solution, by arranging the limiting portion in the form of a ring structure around the electrode terminal, the limiting portion is in the form of a ring structure extending along the circumference of the hole wall surface of the through hole, which is beneficial to further improve the limiting and positioning effect of the limiting portion of the second insulation member on the first insulation member, thereby further improving the assembly quality between the first insulation member and the second insulation member.

[0036] In some embodiments, the second insulation member is fixedly connected to the first insulation member.

[0037] In the above technical solution, by fixedly connecting the first insulation member and the second insulation member, the structural stability of the assembly of the first insulation member and the second insulation member into the shell is improved, and the phenomenon of movement or displacement of the first insulation member during use is further reduced.

[0038] In some embodiments, the battery cell further comprises a second insulation member; the second insulation member is arranged on the side of the wall portion facing the electrode assembly along the thickness direction of the wall portion; wherein along the thickness direction of the wall portion, at least part of the first insulation portion is located between the second insulation member and the wall portion.

[0039] In the technical scheme, the second insulating member is arranged on the side of the wall portion facing the electrode assembly, and at least part of the first insulating portion of the first insulating member is located between the second insulating member and the wall portion, so that the second insulating member and the wall portion can also cooperate to assemble the first insulating portion, so as to fasten the first insulating member in the shell. The battery monomer adopting the structure can improve the stability of the first insulating member assembled in the shell, and is beneficial to alleviate the phenomenon of movement or displacement of the first insulating member in use, so as to improve the use reliability of the battery monomer, and can reduce the difficulty of fastening the first insulating member in the shell, so as to reduce the assembly difficulty of the battery monomer. On the other hand, the second insulating member can first fix the first insulating member in the shell, so that the risk of damaging the electrode assembly due to the displacement of the first insulating member can be reduced during the assembly of the electrode assembly to the shell, which is beneficial to improve the production quality of the battery monomer.

[0040] In some embodiments, the battery monomer further comprises a first current collecting member; the first current collecting member is arranged between the first tab and the wall portion, and the first current collecting member connects the electrode terminal and the first tab; wherein, along the thickness direction of the wall portion, the second insulating member is located between the wall portion and the first current collecting member, and the second insulating member is configured to insulate and isolate the wall portion and the first current collecting member.

[0041] In the technical scheme, the first current collecting member is arranged between the first tab and the wall portion, so that the first current collecting member can connect the electrode terminal and the first tab, which is beneficial to reduce the difficulty of electrical connection between the electrode terminal and the first tab. In addition, by arranging the first current collecting member on the side of the second insulating member away from the wall portion, the second insulating member is arranged between the first current collecting member and the wall portion, and the first current collecting member is also located in the accommodation space of the first insulating member, so that the first insulating member insulates and isolates the first tab and the shell, and the first insulating member and the second insulating member insulate and isolate the first current collecting member and the shell, which is beneficial to reduce the short circuit risk between the first current collecting member and the shell, and further reduces the short circuit risk of the battery monomer, so as to further improve the use reliability of the battery monomer.

[0042] In some embodiments, the second insulating member is fixedly connected to the first insulating member.

[0043] In the technical scheme, the first insulating piece and the second insulating piece are fixedly connected, which can further improve the structural stability of the first insulating piece arranged between the wall portion and the second insulating piece, so as to further reduce the phenomenon of the first insulating piece moving or shifting during use. On the other hand, the first insulating piece and the second insulating piece can be fixedly assembled together and then assembled into the shell, which can reduce the difficulty of assembling the first insulating piece between the second insulating piece and the wall portion, and can alleviate the phenomenon of the first insulating piece moving or shifting during the assembly of the first insulating piece, so as to improve the assembly quality of the first insulating piece.

[0044] In some embodiments, the wall portion is provided with a mounting hole penetrating through the wall portion along the thickness direction of the wall portion, and a portion of the electrode terminal is arranged in the mounting hole. The electrode terminal has a first clamping portion located on the side of the wall portion facing the electrode assembly along the thickness direction of the wall portion. At least part of the first insulating portion is arranged between the wall portion and the first clamping portion to insulate and separate the wall portion and the first clamping portion.

[0045] In the technical scheme, the electrode terminal has a first clamping portion located on the side of the wall portion facing the electrode assembly along the thickness direction of the wall portion, and at least part of the first insulating portion of the first insulating piece is located between the first clamping portion and the wall portion, so that the first clamping portion and the wall portion can cooperate to assemble the first insulating portion to fasten the first insulating piece in the shell. The battery cell with this structure can insulate and separate the first clamping portion and the wall portion while achieving the insulation and separation between the first tab and the shell, so that it is not necessary to separately arrange an insulating component between the first clamping portion and the wall portion, which can reduce the manufacturing cost of the battery cell. On the other hand, the stability of the first insulating piece assembled into the shell can be improved, so as to alleviate the phenomenon of the first insulating piece moving or shifting during use, and improve the use reliability of the battery cell.

[0046] In some embodiments, the battery cell further comprises a sealing piece. At least part of the sealing piece is located between the wall portion and the first clamping portion, and the sealing piece abuts against the first insulating portion.

[0047] In the technical scheme, by arranging at least part of the sealing member between the wall portion and the first clamping portion, the sealing member can play a sealing role, and on the one hand, the first clamping portion and the wall portion can clamp the sealing member to improve the structural stability and reliability of the sealing member assembled between the electrode terminal and the hole wall surface of the mounting hole, and on the other hand, by arranging the sealing member and the first insulating portion in abutment with each other, the gap between the sealing member and the first insulating portion is reduced, which is beneficial to improve the effect of the first insulating portion and the sealing member in insulating and isolating the first clamping portion and the wall portion, and further reduces the risk of short circuit between the first clamping portion and the wall portion, thereby improving the use reliability of the battery monomer.

[0048] In some embodiments, the Rockwell hardness of the second insulating portion is less than the Rockwell hardness of the shell.

[0049] In the technical scheme, by arranging the Rockwell hardness of the second insulating portion to be less than the Rockwell hardness of the shell, the phenomenon of scratching or wearing of the shell caused by the second insulating portion during assembly into the shell is alleviated, thereby reducing the risk of wire drawing or burr of the shell and improving the production quality of the battery monomer.

[0050] In some embodiments, along the thickness direction of the wall portion, the radial dimension of at least part of the outer circumferential surface of the second insulating portion gradually decreases from one end away from the first insulating portion to one end close to the first insulating portion.

[0051] In the technical scheme, by arranging the radial dimension of at least part of the outer circumferential surface of the second insulating portion to gradually decrease from one end away from the first insulating portion to one end close to the first insulating portion, the outer circumferential surface of the second insulating portion can play a certain guiding role during assembly of the first insulating member into the shell, which is beneficial to reduce the difficulty of mutual assembly of the second insulating portion and the shell, thereby improving the assembly efficiency of the battery monomer.

[0052] In some embodiments, along the thickness direction of the wall portion, the thickness of the first insulating portion is greater than or equal to 0.3 mm and less than or equal to 1.2 mm.

[0053] In the technical solution, the thickness of the first insulation part of the first insulation piece is 0.3mm to 1.2mm. On one hand, by setting the thickness of the first insulation part to be greater than or equal to 0.3mm, the structural strength of the first insulation part is improved, which is conducive to improving the insulation isolation effect of the first insulation part on the first tab and the shell, and is conducive to alleviating the damage or warping of the first insulation part during use, thereby effectively improving the stability and reliability of the first insulation part in insulating isolation of the first tab and the shell. On the other hand, by setting the thickness of the first insulation part to be less than or equal to 1.2mm, the phenomenon of the first insulation part occupying too much space in the shell is alleviated, thereby improving the space utilization rate inside the shell to improve the energy density of the battery monomer.

[0054] In some embodiments, the thickness of the second insulation part is greater than or equal to 0.05mm and less than or equal to 0.5mm.

[0055] In the technical solution, the thickness of the second insulation part of the first insulation piece is 0.05mm to 0.5mm. On one hand, by setting the thickness of the second insulation part to be greater than or equal to 0.05mm, the structural strength of the second insulation part is improved, which is conducive to improving the insulation isolation effect of the second insulation part on the first tab and the shell, and is conducive to alleviating the damage or warping of the second insulation part during use, thereby effectively improving the stability and reliability of the second insulation part in insulating isolation of the first tab and the shell. On the other hand, by setting the thickness of the second insulation part to be less than or equal to 0.5mm, the phenomenon of the second insulation part occupying too much space in the shell is alleviated, thereby improving the space utilization rate inside the shell to improve the energy density of the battery monomer.

[0056] In some embodiments, the first insulation part and the second insulation part are integrally formed.

[0057] In the technical solution, by setting the first insulation part and the second insulation part of the first insulation piece to be integrally formed, the first insulation part and the second insulation part are in an integrated structure, thereby improving the connection strength between the first insulation part and the second insulation part to reduce the phenomenon of the first insulation part and the second insulation part separating from each other, which is conducive to improving the stability and reliability of the first insulation piece during use.

[0058] In some embodiments, along the thickness direction of the wall part, the thickness of the second insulation part gradually increases from one end away from the first insulation part to one end close to the first insulation part.

[0059] In the technical solution, the thickness of the second insulation part is gradually increased from the end far away from the first insulation part to the end close to the first insulation part, so that the second insulation part has a larger thickness at the end connected to the first insulation part, thereby improving the connection reliability between the second insulation part and the first insulation part, improving the structural stability of the first insulation part, and reducing the forming difficulty of the first insulation part and the second insulation part.

[0060] In some embodiments, the side wall is cylindrical, and a central axis of the side wall extends along a thickness direction of the wall part.

[0061] In the technical solution, the side wall of the shell is cylindrical, so that the shell is cylindrical, facilitating the processing of the cylindrical battery monomer, and the battery monomer has the advantages of high capacity, long cycle life, wide use environment temperature, etc. In addition, the shell is cylindrical, so that the electrode assembly is arranged in a cylindrical structure with a central axis extending along the thickness direction of the wall part, facilitating the insertion of the first tab of the electrode assembly into the accommodation space of the first insulation part, and reducing the manufacturing difficulty of the first insulation part.

[0062] In some embodiments, the shell includes a shell body and an end cover; the shell body includes the side wall and the bottom wall which are integrally formed, the side wall surrounds 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; the side wall and the bottom wall jointly define an accommodation cavity, and the electrode assembly is accommodated in the accommodation cavity; the end cover closes the opening; wherein the bottom wall is the wall part; or the end cover is the wall part.

[0063] In the technical solution, the wall part of the shell is arranged as the bottom wall of the shell body opposite to the end cover in the thickness direction of the wall part. The battery monomer with this structure can arrange the wall part with the electrode terminal away from the end cover, so that there is no direct connection relationship between the wall part and the end cover, thereby relieving the phenomenon that the force generated when the electrode terminal and other components pull or twist the wall part acts on the end cover, reducing the risk of connection failure between the end cover and the shell body, and further reducing the risk of liquid leakage of the battery monomer in use. Similarly, the wall part of the shell is arranged as the end cover of the shell for closing the opening of the shell body. The battery monomer with this structure facilitates the assembly of the electrode terminal on the end cover, and facilitates the electrical connection between the electrode terminal and the first tab, thereby reducing the assembly difficulty of the battery monomer and improving the production efficiency of the battery monomer.

[0064] In a second aspect, the embodiments of the present application also provide a battery including the battery monomer.

[0065] In a third aspect, the embodiments of the present application further provide a power utilization device, comprising the battery cell described above, which is used to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0066] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0067] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0068] Fig. 2 is a structural exploded view of a battery provided by some embodiments of the present application;

[0069] Fig. 3 is a structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0070] Fig. 4 is a structural exploded view of a battery cell provided by some embodiments of the present application;

[0071] Fig. 5 is a sectional view of a battery cell provided by some embodiments of the present application;

[0072] Fig. 6 is a partial enlarged view of A of the battery cell shown in Fig. 5;

[0073] Fig. 7 is a structural schematic diagram of a first insulating member provided by some embodiments of the present application;

[0074] Fig. 8 is a sectional view of a first insulating member provided by some embodiments of the present application;

[0075] Fig. 9 is a sectional view of a battery cell provided by yet some embodiments of the present application;

[0076] Fig. 10 is a partial enlarged view of B of the battery cell shown in Fig. 9;

[0077] Fig. 11 is a sectional view of a battery cell provided by still some embodiments of the present application;

[0078] Fig. 12 is a partial enlarged view of C of the battery cell shown in Fig. 11.

[0079] Icon: 1000 - vehicle; 100 - battery; 10 - case; 11 - first case body; 12 - second case body; 20 - battery cell; 21 - case; 211 - wall portion; 2111 - mounting hole; 212 - housing; 2121 - opening; 2122 - bottom wall; 2123 - side wall; 2123a - groove; 213 - end cover; 22 - electrode terminal; 221 - first clamping portion; 222 - second clamping portion; 23 - electrode assembly; 231 - main body portion; 232 - first tab; 233 - second tab; 234 - separation film; 24 - first insulating member; 241 - first insulating portion; 2411 - through hole; 242 - second insulating portion; 2421 - notch; 243 - accommodation space; 25 - second insulating member; 251 - limiting portion; 26 - third insulating member; 27 - sealing member; 28 - first current collecting member; 29 - second current collecting member; 30 - adhesive layer; 200 - controller; 300 - motor; X - thickness direction of wall portion; Y - radial direction of second insulating portion. DETAILED DESCRIPTION

[0080] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0081] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as those commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0082] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0083] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0084] The term "and / or" in the application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the application generally represents that the front and rear associated objects have an "or" relationship.

[0085] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0086] "Multiple" appearing in the application means more than two (including two).

[0087] In the embodiments of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to use.

[0088] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the application are not limited in this regard.

[0089] 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 allow the active ions to pass through.

[0090] 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.

[0091] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0092] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum subjected to silver plating on the surface, stainless steel subjected to silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a high molecular 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, or the like) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0093] As an example, the positive electrode 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 electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. As an example of the lithium-containing phosphate, at least one of lithium iron phosphate (such as LiFeP04(also referred to simply as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon can be included, but is not limited thereto. As an example of the lithium transition metal oxide, lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(also referred to simply as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2(also referred to simply as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2(also referred to simply as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2(also referred to simply as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2(also referred to simply as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05O2) and modified compounds thereof, etc.

[0094] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is employed as the positive electrode, the foamed metal surface can be free of the positive electrode active material, or can be provided with the positive electrode active material. As an example, the foamed metal can be filled or / and deposited with a lithium source material, potassium metal, or sodium metal. The lithium source material can be lithium metal and / or a lithium-rich material.

[0095] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0096] As an example, the negative electrode 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.).

[0097] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0098] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0099] As an example, the negative electrode active material can employ a negative electrode active material known in the art for use in a battery cell. As an example, the negative electrode 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 electrode active material can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0100] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0101] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0102] In some embodiments, the separator is a separator film. The separator film can be of various types, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0103] 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.

[0104] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive and negative electrodes.

[0105] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0106] 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.

[0107] 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, butanedisulfone, 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.

[0108] Among them, the gel-state electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0109] Among them, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0110] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, a cellulose, or the like.

[0111] 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.

[0112] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0113] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0114] In some embodiments, the electrode assembly is a stacked structure.

[0115] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0116] 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.

[0117] 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.

[0118] As an example, a plurality of separators can be provided, and each of the separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0119] As an example, the separators can be continuously provided and provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0120] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, or the like.

[0121] In some embodiments, the electrode assembly is provided with a tab. The tab can guide current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0122] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, or the like.

[0123] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, and the prismatic battery cell includes, but is not limited to, a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, and the like.

[0124] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0125] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0126] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0127] 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 longitudinal beam of the vehicle.

[0128] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0129] 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 performance parameters, and in addition, the safety of the battery needs to be considered.

[0130] For a general battery cell, the battery cell usually includes a shell and an electrode assembly accommodated in the shell, and an electrode terminal is arranged on the shell. Correspondingly, one end of the electrode assembly is formed with a tab, and the electrode terminal and the tab are electrically connected to realize the input or output of the electric energy of the battery cell. However, since the tab is very easy to contact the shell, the battery cell is prone to short circuit risk. Therefore, in the related art, an insulating film or an insulating piece is arranged on the outer side of the electrode assembly to insulate and isolate the tab and the shell by the insulating film or the insulating piece. However, the battery cell with such a structure is prone to the phenomenon of the insulating film being warped or damaged during use, thereby causing the risk of the tab and the shell being short-circuited during use of the battery cell, or the insulating piece being easily scratched on the electrode assembly or inserted into the electrode assembly, thereby causing the electrode assembly to be damaged, which is not conducive to improving the assembly quality and use stability of the battery cell.

[0131] In view of the above, in order to solve the problems of poor assembly quality and low use stability of the battery monomer, the application provides a battery monomer, which comprises a shell, an electrode terminal, an electrode assembly and a first insulating piece. The shell has a wall portion and a side wall surrounding the wall portion. The electrode terminal is arranged on the wall portion. The electrode assembly is accommodated in the shell, and the electrode assembly has a first tab arranged at one end of the electrode assembly close to the wall portion in the thickness direction of the wall portion, and the first tab is electrically connected with the electrode terminal. The first insulating piece comprises a first insulating portion and a second insulating portion, at least part of the first insulating portion is located between the wall portion and the first tab, the second insulating portion surrounds the first insulating portion, and the second insulating portion and the first insulating portion jointly define an accommodation space, one end of the second insulating portion is connected with the first insulating portion in the thickness direction of the wall portion, and at least part of the first tab is inserted into the accommodation space. A groove is arranged on the inner circumferential surface of the side wall, and one end of the second insulating portion away from the first insulating portion is inserted into the groove.

[0132] In the battery monomer with the above structure, the first insulating piece for insulating and isolating the first tab and the shell is arranged in the shell, the first insulating piece comprises a first insulating portion and a second insulating portion, the first insulating portion is arranged between the wall portion and the first tab, the second insulating portion surrounds the first insulating portion, and one end of the second insulating portion in the thickness direction of the wall portion is connected with the first insulating portion, so that the first insulating portion and the second insulating portion jointly form an accommodation space for the first tab, so as to realize the separation between the first tab and the wall portion and between the first tab and the side wall through the first insulating portion and the second insulating portion of the first insulating piece, which is beneficial to improve the effect of the first insulating piece in insulating and isolating the first tab and the shell, thereby reducing the risk of short circuit of the battery monomer and improving the use reliability of the battery monomer. By arranging the groove on the inner circumferential surface of the side wall and inserting one end of the second insulating portion away from the first insulating portion into the groove, the interference between the second insulating portion and the electrode assembly can be reduced, so that the phenomenon of the second insulating portion pressing or scratching the electrode assembly during use of the battery monomer can be alleviated, and the phenomenon of one end of the second insulating portion away from the first insulating portion being inserted into the electrode assembly during assembly of the battery monomer can be alleviated, thereby reducing the risk of damage to the electrode assembly and improving the assembly quality and use stability of the battery monomer.

[0133] The battery monomer disclosed in the application can be used in an electric device such as a vehicle, a ship or an aircraft, etc. A 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 damage to the electrode assembly during assembly or use of the battery monomer can be alleviated, and the assembly quality and use stability of the battery monomer can be improved.

[0134] The embodiments of the present application provide a power consumption device using a battery as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft.

[0135] The following embodiments are described by taking a power consumption device as a vehicle as an example for convenience of description.

[0136] Referring to FIG. 1, FIG. 1 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, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile. The vehicle 1000 is internally provided with a battery 100. The battery 100 can be arranged at the bottom of the vehicle 1000, or arranged at the head of the vehicle 1000, or arranged 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 supply or a use power supply of the vehicle 1000. 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.

[0137] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply or a use power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0138] Referring to FIG. 2 and FIG. 3, FIG. 2 is a structural explosion 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. The battery monomer 20 is used to be accommodated in the box body 10.

[0139] The box 10 is configured to provide an assembly space for the battery cell 20. The box 10 can have various structures. In some embodiments, the box 10 can include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 are coupled to each other to define an assembly space for accommodating the battery cell 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate structure. The first box body 11 is coupled to the open end of the second box body 12 to define the assembly space together with the second box body 12. Alternatively, the first box body 11 and the second box body 12 can both be hollow structures with one end open. The open end of the first box body 11 is coupled to the open end of the second box body 12.

[0140] The box 10 formed by the first box body 11 and the second box body 12 can have various shapes, such as a cylinder, a cuboid, a square, etc. For example, as shown in FIG. 2, the box 10 has a cuboid shape.

[0141] In the battery 100, the battery cell 20 disposed in the box 10 can be one or a plurality of battery cells. When the battery cell 20 disposed in the box 10 is a plurality of battery cells, the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the plurality of battery cells 20 can be accommodated in the box 10. Alternatively, the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed connection to form a battery module, and then a plurality of battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box 10.

[0142] In some embodiments, the battery 100 can further include other structures. For example, the battery 100 can further include a busbar member configured to connect the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20.

[0143] Each of the battery cells 20 can be a secondary battery or a primary battery, and can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can have a cuboid, a cylinder, a prism, or other shapes, etc. For example, as shown in FIG. 3, the battery cell 20 has a cylindrical shape.

[0144] According to some embodiments of the present application, referring to FIG. 3, and further referring to FIG. 4, FIG. 5, FIG. 6, FIG. 7 and FIG. 8, 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 an enlarged view of part A of the battery cell 20 shown in FIG. 5, FIG. 7 is a structural schematic view of the first insulating member 24 according to some embodiments of the present application, and FIG. 8 is a sectional view of the first insulating member 24 according to some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, an electrode terminal 22, an electrode assembly 23 and a first insulating member 24. The housing 21 has a wall portion 211 and a side wall 2123 surrounding the wall portion 211. The electrode terminal 22 is arranged on the wall portion 211. The electrode assembly 23 is accommodated in the housing 21, and the electrode assembly 23 has a first tab 232 arranged at one end of the electrode assembly 23 close to the wall portion 211 in the thickness direction X of the wall portion, and the first tab 232 is electrically connected to the electrode terminal 22. The first insulating member 24 includes a first insulating portion 241 and a second insulating portion 242, at least part of the first insulating portion 241 is located between the wall portion 211 and the first tab 232, the second insulating portion 242 surrounds the first insulating portion 241, and the second insulating portion 242 and the first insulating portion 241 together define an accommodation space 243, one end of the second insulating portion 242 is connected to the first insulating portion 241 in the thickness direction X of the wall portion, and at least part of the first tab 232 is inserted into the accommodation space 243. A groove 2123a is arranged on the inner circumferential surface of the side wall 2123, and one end of the second insulating portion 242 away from the first insulating portion 241 is inserted into the groove 2123a.

[0145] The housing 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms. The material of the housing 21 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0146] In some embodiments, the housing 21 can include a shell 212 and an end cover 213, the inside of the shell 212 is formed with an accommodation cavity, and the accommodation cavity has an opening 2121, i.e. the shell 212 is a hollow structure with one end open, and the end cover 213 is sealed to the opening 2121 of the shell 212 to form a sealed space for accommodating the electrode assembly 23 and the electrolyte.

[0147] The shell 212 can include a bottom wall 2122 and a side wall 2123 surrounding the bottom wall 2122, one end of the side wall 2123 is connected to the bottom wall 2122, and the other end forms the opening 2121.

[0148] Optionally, the wall portion 211 provided with the electrode terminal 22 can be an end cover 213 of the outer shell 21, or can be a bottom wall 2122 of the shell body 212 of the outer shell 21. Exemplarily, in FIGS. 4 and 5, the wall portion 211 is the bottom wall 2122 of the shell body 212 oppositely arranged with the end cover 213 in the thickness direction X of the wall portion, and correspondingly, the thickness direction X of the wall portion is the arrangement direction of the end cover 213 and the wall portion 211, and is also the thickness direction of the end cover 213. Of course, in other embodiments, the wall portion 211 can also be the end cover 213 of the outer shell 21.

[0149] The side wall 2123 surrounds the wall portion 211, that is, the side wall 2123 is an annular structure extending along the circumference of the wall portion 211, and the side wall 2123 surrounds the outer circumferential side of the electrode assembly 23.

[0150] When assembling the battery cell 20, the electrode assembly 23 can be first placed into the shell body 212, and the electrolyte is filled into the shell body 212, and then the end cover 213 is covered on the opening 2121 of the shell body 212 to close the opening 2121 of the shell body 212.

[0151] The shell body 212 can be various shapes, such as a cylinder, a cuboid, etc. The shape of the shell body 212 can be determined according to the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 is a cylindrical structure, the shell body 212 can be selected as a cylindrical structure; if the electrode assembly 23 is a cuboid structure, the shell body 212 can be selected as a cuboid structure. Of course, the end cover 213 can also be various structures, such as a plate-like structure or a hollow structure with one end open, etc. Exemplarily, in FIGS. 3 and 4, the shell body 212 is a cylindrical structure, and correspondingly, the side wall 2123 of the shell body 212 is also a cylindrical structure, and the central axis of the shell body 212 extends along the thickness direction X of the wall portion, and correspondingly, the end cover 213 is a circular plate-like structure.

[0152] It can be understood that the outer shell 21 is not limited to the above structure, and the outer shell 21 can also be other structures, such as the outer shell 21 including the shell body 212 and two end covers 213, the shell body 212 being a hollow structure with opposite openings 2121, one end cover 213 corresponding to being covered at one opening 2121 of the shell body 212 and forming a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte, that is, the shell body 212 of the outer shell 21 only includes the side wall 2123, and the side wall 2123 is a hollow structure with openings 2121 at both ends in the thickness direction X of the wall portion, and the two end covers 213 are respectively covered at the openings 2121 at both ends of the side wall 2123 in the thickness direction X of the wall portion.

[0153] It should be noted that the electrode assembly 23 is a component in which an electrochemical reaction occurs in the battery cell 20, and the electrode assembly 23 includes a first electrode tab, a second electrode tab, and a separator 234, the polarities of the first electrode tab and the second electrode tab are opposite, and a portion of the separator 234 is disposed between the first electrode tab and the second electrode tab to separate the first electrode tab and the second electrode tab. Among them, the structure of the electrode assembly 23 can be various, for example, the electrode assembly 23 can be a winding type structure formed by winding the first electrode tab, the separator 234 and the second electrode tab, or can be a stacking type structure formed by stacking the first electrode tab, the separator 234 and the second electrode tab. In FIG. 4, the electrode assembly 23 is a winding type structure formed by winding the first electrode tab, the separator 234 and the second electrode tab, the electrode assembly 23 has a cylindrical structure, and the central axis of the electrode assembly 23 extends along the thickness direction X of the wall portion.

[0154] Among them, the first electrode tab includes a first main body and a first tab 232 connected to one end of the first main body, the first main body is a region of the first electrode tab on which an active material layer is coated, and the first tab 232 is a region of the first electrode tab on which the active material layer is not coated, if the first electrode tab is a positive electrode tab, the first main body is a region of the first electrode tab on which a positive active material layer is coated, and the first tab 232 is a region of the first electrode tab on which the positive active material layer is not coated, and the first tab 232 is used to input or output the positive electrode of the electrode assembly 23, if the first electrode tab is a negative electrode tab, the first main body is a region of the first electrode tab on which a negative active material layer is coated, and the first tab 232 is a region of the first electrode tab on which the negative active material layer is not coated, and the first tab 232 is used to input or output the negative electrode of the electrode assembly 23. Similarly, the second electrode tab includes a second main body and a second tab 233 connected to one end of the second main body, the second main body is a region of the second electrode tab on which an active material layer is coated, and the second tab 233 is a region of the second electrode tab on which the active material layer is not coated, if the second electrode tab is a positive electrode tab, the second main body is a region of the second electrode tab on which a positive active material layer is coated, and the second tab 233 is a region of the second electrode tab on which the positive active material layer is not coated, and the second tab 233 is used to input or output the positive electrode of the electrode assembly 23, if the second electrode tab is a negative electrode tab, the second main body is a region of the second electrode tab on which a negative active material layer is coated, and the second tab 233 is a region of the second electrode tab on which the negative active material layer is not coated, and the second tab 233 is used to input or output the negative electrode of the electrode assembly 23.

[0155] Exemplarily, the material of the first tab 232 can be copper or aluminum, and similarly, the material of the second tab 233 can also be copper or aluminum.

[0156] The polarities of the first electrode tab and the second electrode tab are opposite, that is, the first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab, or vice versa, the first electrode tab is a negative electrode tab, and the second electrode tab is a positive electrode tab.

[0157] It should be noted that the part of the first main body of the first tab and the second main body of the second tab that are wound together forms the main body part 231 of the electrode assembly 23, and the first and second tabs 232 and 233 are formed at the two ends of the main body part 231 in the thickness direction X of the wall part, the first tab 232 is located at one end of the main body part 231 in the thickness direction X of the wall part close to the wall part 211, so that the first tab 232 is arranged at one end of the electrode assembly 23 in the thickness direction X of the wall part close to the wall part 211, and the second tab 233 is located at one end of the main body part 231 in the thickness direction X of the wall part away from the wall part 211.

[0158] Exemplarily, the first tab 232 of the first tab can be formed at one end of the main body part 231 in the thickness direction X of the wall part close to the wall part 211 by a rubbing process or a smoothing process, and similarly, the second tab 233 of the second tab can be formed at one end of the main body part 231 in the thickness direction X of the wall part away from the wall part 211 by a rubbing process or a smoothing process.

[0159] A part of the isolation film 234 is arranged between the first tab and the second tab to insulate and isolate the first tab and the second tab, and a part of the isolation film 234 is wrapped around the outside of the main body part 231 of the electrode assembly 23 along the axis extending in the thickness direction X of the wall part, so that the isolation film 234 can also insulate and isolate the electrode assembly 23 and the side wall 2123. It should be noted that only the part of the isolation film 234 wrapped around the outside of the electrode assembly 23 is shown in FIG. 6, and the part of the isolation film 234 between the first tab and the second tab is not shown, wherein the part of the isolation film 234 wrapped around the outside of the electrode assembly 23 along the axis extending in the thickness direction X of the wall part is the part of the isolation film 234 in the electrode assembly 23 for finishing.

[0160] Exemplarily, the main material of the isolation film 234 can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0161] Alternatively, the electrode assembly 23 accommodated in the shell 21 can be one or multiple. Exemplarily, in FIGS. 4 and 5, only one electrode assembly 23 is arranged in the shell 21 of the battery monomer 20, of course, in other embodiments, the electrode assembly 23 accommodated in the shell 21 can be two, three, four, five, six, seven or eight, etc.

[0162] In the embodiments of the present application, the electrode terminal 22 serves as an input or output of the electric energy of the battery monomer 20, the electrode terminal 22 is insulatively mounted on the wall part 211 of the shell 21, and the electrode terminal 22 is used to be electrically connected with the electrode assembly 23 to output or input the electric energy of the battery monomer 20.

[0163] It is to be noted that the electrode terminal 22 is insulatedly mounted on the wall portion 211, that is, no electrical connection is formed between the electrode terminal 22 and the wall portion 211.

[0164] Referring to FIGS. 5 and 6, the electrode terminal 22 is riveted to the wall portion 211, that is, the wall portion 211 is provided with a mounting hole 2111 penetrating through both sides of the wall portion 211 along the thickness direction X of the wall portion, and a portion of the electrode terminal 22 is arranged in the mounting hole 2111, and the electrode terminal 22 has a first clamping portion 221 located on the side of the wall portion 211 facing the electrode assembly 23 and a second clamping portion 222 located on the side of the wall portion 211 away from the electrode assembly 23, and at least a portion of the wall portion 211 is located between the first clamping portion 221 and the second clamping portion 222 in the thickness direction X of the wall portion, so that the first clamping portion 221 and the second clamping portion 222 can cooperatively clamp the wall portion 211 to achieve riveting of the electrode terminal 22 to the wall portion 211. Of course, in other embodiments, the electrode terminal 22 can also be welded or adhered to the wall portion 211.

[0165] In some embodiments, referring to FIGS. 5 and 6, the battery cell 20 can further include a second insulating member 25 and a third insulating member 26, the second insulating member 25 is located on the side of the wall portion 211 facing the electrode assembly 23, and a portion of the second insulating member 25 is located between the first clamping portion 221 and the wall portion 211 to insulate and separate the first clamping portion 221 and the wall portion 211, and the third insulating member 26 is located on the side of the wall portion 211 away from the electrode assembly 23, and a portion of the third insulating member 26 is located between the second clamping portion 222 and the wall portion 211 to insulate and separate the second clamping portion 222 and the wall portion 211.

[0166] Exemplarily, the materials of the second insulating member 25 and the third insulating member 26 can be various, such as plastic, rubber, or silicone, etc.

[0167] In FIG. 6, the battery cell 20 can further include a sealing member 27, the sealing member 27 is arranged between the wall portion 211 and the electrode terminal 22, and at least a portion of the sealing member 27 extends into the mounting hole 2111, so that at least a portion of the sealing member 27 is located between the electrode terminal 22 and the hole wall surface of the mounting hole 2111, so that the sealing member 27 can seal the gap between the electrode terminal 22 and the hole wall surface of the mounting hole 2111, and so that the sealing member 27 can also insulate and separate the electrode terminal 22 and the hole wall surface of the mounting hole 2111.

[0168] Exemplarily, the material of the sealing member 27 can be various, such as rubber, plastic, or silicone, etc.

[0169] The first lug 232 is electrically connected with the electrode terminal 22, and the second lug 233 is electrically connected with the shell 21. The shell 21 is provided with a wall opposite to the wall portion 211 in the thickness direction X of the wall portion, and the wall is electrically connected with the second lug 233. Exemplarily, the wall portion 211 is the bottom wall 2122 of the shell 212, and correspondingly, the end cover 213 of the shell 21 is electrically connected with the second lug 233. If the end cover 213 is the wall portion 211, the bottom wall 2122 of the shell 212 is electrically connected with the second lug 233. Of course, in other embodiments, the battery monomer 20 can also include two electrode terminals 22, which are respectively mounted at two ends of the shell 21 in the thickness direction X of the wall portion, and are respectively electrically connected with the first lug 232 and the second lug 233 of the electrode assembly 23 at the two ends in the thickness direction X of the wall portion, so as to realize the input or output of the electric energy of the battery monomer 20.

[0170] Exemplarily, the material of the electrode terminal 22 can also be various, for example, the material of the electrode terminal 22 can be copper, iron, aluminum, steel or aluminum alloy, etc.

[0171] In some embodiments, the battery monomer 20 can also include two current collecting members, which are respectively a first current collecting member 28 and a second current collecting member 29. The first current collecting member 28 and the second current collecting member 29 are both arranged in the shell 21. The first current collecting member 28 is used for connecting the first lug 232 and the electrode terminal 22, and the second current collecting member 29 is used for connecting the second lug 233 and the shell 21, thereby facilitating the assembly difficulty between the first lug 232 and the electrode terminal 22 and between the second lug 233 and the shell 21.

[0172] The wall portion 211 is the bottom wall 2122 of the shell 212, and the second current collecting member 29 is a structure for connecting the second lug 233 and the end cover 213.

[0173] Exemplarily, the material of the first current collecting member 28 and the second current collecting member 29 can also be various, for example, the material of the first current collecting member 28 and the second current collecting member 29 can be copper, iron, aluminum, steel or aluminum alloy, etc.

[0174] In the embodiments of the present application, the first insulating member 24 plays a role of insulating and isolating the first lug 232 and the shell 21. The first insulating member 24 includes a first insulating portion 241 and a second insulating portion 242, that is, the first insulating member 24 is composed of two parts.

[0175] The second insulation part 242 is arranged around the first insulation part 241, and the second insulation part 242 and the first insulation part 241 jointly define the accommodation space 243. That is, the first insulation part 24 is a hollow structure with an open end in the thickness direction X of the wall part, so that the first insulation part 24 can be sleeved on the electrode assembly 23 from the end of the electrode assembly 23 close to the wall part 211, that is, the end of the electrode assembly 23 forming the first tab 232 can be inserted into the accommodation space 243 of the first insulation part 24.

[0176] Exemplarily, as shown in FIGS. 7 and 8, the second insulation part 242 is connected to the first insulation part 241 at the end close to the wall part 211 in the thickness direction X of the wall part, so that the first insulation part 24 is a hollow structure with an open end at the end away from the first insulation part 241.

[0177] In the thickness direction X of the wall part, at least part of the first tab 232 is inserted into the accommodation space 243, and the first insulation part 241 is located between the wall part 211 and the first tab 232. That is, in the thickness direction X of the wall part, the wall part 211 and the first tab 232 are respectively located on the two sides of the first insulation part 241, and the second insulation part 242 surrounds the outside of the first tab 232. That is, the second insulation part 242 is a ring structure, and the second insulation part 242 surrounds the first tab 232, so that the first insulation part 24 can insulate and isolate the shell 21 and the first tab 232.

[0178] Exemplarily, in FIGS. 6 and 7, the first insulation part 241 is provided with a through hole 2411 for inserting the electrode terminal 22. The through hole 2411 penetrates the two sides of the first insulation part 241 in the thickness direction X of the wall part, so that the through hole 2411 communicates with the accommodation space 243, and the electrode terminal 22 is inserted into the through hole 2411 in the thickness direction X of the wall part and is electrically connected with the first tab 232.

[0179] Optionally, the first insulation part 241 and the second insulation part 242 of the first insulation part 24 can be an integrally formed structure or a separately arranged structure. Exemplarily, in FIGS. 7 and 8, the first insulation part 241 and the second insulation part 242 of the first insulation part 24 are an integrally formed structure, that is, the first insulation part 241 and the second insulation part 242 of the first insulation part 24 are an integral structure, and the first insulation part 241 and the second insulation part 242 of the first insulation part 24 can be made by an integrally forming process such as injection molding or milling. Of course, in other embodiments, the first insulation part 241 and the second insulation part 242 of the first insulation part 24 can also be a separately arranged structure, and the end of the second insulation part 242 close to the wall part 211 can be connected to the first insulation part 241 by bonding or clamping.

[0180] Exemplarily, the material of the first insulation member 24 can be rubber, plastic, or silica gel, etc.

[0181] The inner circumferential surface of the side wall 2123 is provided with a groove 2123a, and the end of the second insulation portion 242 away from the first insulation portion 241 is inserted into the groove 2123a, that is, the surface of the side wall 2123 facing the electrode assembly 23 is provided with the groove 2123a, and at least part of the end of the second insulation portion 242 away from the first insulation portion 241 is accommodated in the groove 2123a. It should be noted that the end of the second insulation portion 242 away from the first insulation portion 241 can be a structure in which the entire second insulation portion 242 is located in the groove 2123a in the radial direction Y of the second insulation portion, that is, the end of the second insulation portion 242 away from the first insulation portion 241 does not protrude from the inner circumferential surface of the side wall 2123 in the radial direction Y of the second insulation portion. Of course, the end of the second insulation portion 242 away from the first insulation portion 241 can also be a structure in which part of the second insulation portion 242 is located in the groove 2123a in the radial direction Y of the second insulation portion, that is, the end of the second insulation portion 242 away from the first insulation portion 241 protrudes from the inner circumferential surface of the side wall 2123 in the radial direction Y of the second insulation portion.

[0182] It should be noted that the radial direction Y of the second insulation portion is perpendicular to the thickness direction X of the wall portion, and the radial direction Y of the second insulation portion is: in a plane perpendicular to the thickness direction X of the wall portion, the center position of the second insulation portion 242 points to the direction of the outer circumferential surface of the second insulation portion 242 or the outer circumferential surface of the second insulation portion 242 points to the direction of the center position of the second insulation portion 242.

[0183] Exemplarily, the groove 2123a is a ring-shaped groove structure extending along the circumferential direction of the side wall 2123, that is, the groove 2123a is arranged around the electrode assembly 23.

[0184] In some embodiments, the battery monomer 20 can also include a pressure relief mechanism arranged on the shell 21, and the pressure relief mechanism is used to release the internal pressure of the battery monomer 20 when the internal pressure or temperature of the battery monomer 20 reaches a predetermined value.

[0185] Optionally, the pressure relief mechanism can be arranged on the end cover 213 of the shell 21, or can be arranged on the shell body 212 of the shell 21. Similarly, the pressure relief mechanism and the shell 21 can be an integrally formed structure, or can be a separate structure. If the pressure relief mechanism and the shell 21 are a separate structure, the pressure relief mechanism can be connected to the shell 21 by welding or the like. Correspondingly, the pressure relief mechanism can be a pressure relief component such as an explosion-proof valve, an explosion-proof sheet, a gas valve, a pressure relief valve, or a safety valve. If the pressure relief mechanism and the shell 21 can also be an integrally formed structure, the pressure relief mechanism is a region with a weak structure formed on the shell 21, for example, a region provided with a notch groove on the shell 21.

[0186] In the embodiment, the first insulation piece 24 is arranged in the shell 21 to insulate and separate the first tab 232 from the shell 21. The first insulation piece 24 includes a first insulation portion 241 and a second insulation portion 242. The first insulation portion 241 is arranged between the wall portion 211 and the first tab 232. The second insulation portion 242 surrounds the first insulation portion 241. One end of the second insulation portion 242 in the thickness direction X of the wall portion is connected to the first insulation portion 241. The first insulation portion 241 and the second insulation portion 242 jointly form an accommodation space 243 for the first tab 232. The first tab 232 is inserted into the accommodation space 243. The first insulation portion 241 and the second insulation portion 242 respectively achieve the separation between the first tab 232 and the wall portion 211 and between the first tab 232 and the side wall 2123. This facilitates improving the effect of the first insulation piece 24 in insulating and separating the first tab 232 from the shell 21. Thus, the risk of short circuit of the battery monomer 20 can be reduced, and the use reliability of the battery monomer 20 can be improved. In addition, by arranging the groove 2123a on the inner circumferential surface of the side wall 2123 and inserting the end of the second insulation portion 242 away from the first insulation portion 241 into the groove 2123a, the interference between the second insulation portion 242 and the electrode assembly 23 can be reduced. In the use process of the battery monomer 20, the phenomenon that the second insulation portion 242 extrudes or scratches the electrode assembly 23 can be alleviated. In the assembly process of the battery monomer 20, the end of the second insulation portion 242 away from the first insulation portion 241 is inserted into the electrode assembly 23. The phenomenon can be alleviated. Thus, the risk of damage to the electrode assembly 23 can be reduced, and the assembly quality and use stability of the battery monomer 20 can be improved.

[0187] According to some embodiments of the present application, referring to FIGS. 5 and 6, the electrode assembly 23 includes a first tab. The first tab includes a first body and the first tab 232. The first tab 232 is connected to one end of the first body close to the wall portion 211 in the thickness direction X of the wall portion. In the thickness direction X of the wall portion, the end of the second insulation portion 242 away from the first insulation portion 241 extends to between the first body and the side wall 2123. The first tab 232 is located in the accommodation space 243 as a whole.

[0188] The first main body of the first pole piece and the second main body of the second pole piece are wound together to form a main body part 231 of the electrode assembly 23. Correspondingly, the second insulation part 242 extends from one end of the first insulation part 241 to between the main body part 231 of the electrode assembly 23 and the side wall 2123 of the shell 21 in the thickness direction X of the wall part, that is, in the radial direction Y of the second insulation part 242, one end of the second insulation part 242 is located between the main body part 231 of the electrode assembly 23 and the side wall 2123 of the shell 21, so that the first lug 232 connected to the main body part 231 near one end of the wall part 211 in the thickness direction X of the wall part can be entirely inserted into the accommodation space 243, that is, the projection of the first lug 232 in the radial direction Y of the second insulation part 242 is located in the second insulation part 242.

[0189] In the embodiment, by extending the one end of the second insulation part 242 away from the first insulation part 241 to between the first main body of the first pole piece and the side wall 2123, the first lug 232 can be entirely accommodated in the accommodation space 243. Since the one end of the second insulation part 242 is inserted into the groove 2123a, that is, the one end of the second insulation part 242 extending to between the first main body and the side wall 2123 is inserted into the groove 2123a, the battery monomer 20 with this structure can further improve the effect of the first insulation part 24 in insulating and isolating the first lug 232 and the side wall 2123 while relieving the insertion of the one end of the second insulation part 242 into the electrode assembly 23 or scratching and damaging the electrode assembly 23, thereby further reducing the risk of short circuit of the battery monomer 20.

[0190] According to some embodiments of the present application, please continue to refer to FIGS. 5 and 6, the groove 2123a is an annular groove extending along the circumferential direction of the side wall 2123. That is, the groove 2123a is an annular structure connected at its ends and surrounding the outside of the electrode assembly 23.

[0191] In the embodiment, by setting the groove 2123a as an annular groove structure extending along the circumferential direction of the side wall 2123, the groove 2123a and the second insulation part 242 are both annular structures, so that the one end of the second insulation part 242 is inserted into the groove 2123a, which is beneficial to reduce the assembly difficulty between the second insulation part 242 and the groove 2123a, thereby improving the assembly efficiency of the battery monomer 20.

[0192] According to some embodiments of the present application, please refer to FIG. 6, the wall thickness of the side wall 2123 is D1, the groove depth of the groove 2123a is H, and 1 / 3≤H / D1≤1 / 2 is satisfied.

[0193] The wall thickness D1 of the side wall 2123 is a thickness dimension of the side wall 2123 in the normal direction of the inner circumferential surface of the side wall 2123. For example, in the embodiment of the present application, the side wall 2123 is a cylinder, and the wall thickness D1 of the side wall 2123 is a thickness dimension of the side wall 2123 in the radial direction of the side wall 2123.

[0194] The groove depth H of the groove 2123a is the maximum distance between the inner circumferential surface of the side wall 2123 at the corresponding position and the groove bottom wall 2122 of the groove 2123a in the normal direction of the inner circumferential surface of the side wall 2123 at the corresponding position. For example, in the embodiment of the present application, the side wall 2123 is a cylinder, and the groove depth H of the groove 2123a is the maximum depth of the groove 2123a in the radial direction of the side wall 2123, which is also the minimum difference between the wall thickness of the side wall 2123 and the wall thickness of the groove bottom wall 2122 of the groove 2123a.

[0195] For example, the ratio of the groove depth H of the groove 2123a to the wall thickness D1 of the side wall 2123 can be 1 / 3, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, or 0.5, etc.

[0196] For example, the wall thickness D1 of the side wall 2123 is usually greater than or equal to 0.2 mm and less than or equal to 0.8 mm.

[0197] In the embodiment, the ratio of the groove depth of the groove 2123a to the wall thickness D1 of the side wall 2123 is one-third to one-half. On the one hand, by setting the groove depth of the groove 2123a to be greater than or equal to one-third of the wall thickness of the side wall 2123, the phenomenon of the groove 2123a being too deep on the inner circumferential surface of the side wall 2123 is alleviated, thereby improving the wall thickness of the groove bottom wall 2122 of the groove 2123a and improving the structural strength of the area of the side wall 2123 provided with the groove 2123a, so as to alleviate the phenomenon of the side wall 2123 being broken or damaged during use. On the other hand, by setting the groove depth of the groove 2123a to be less than or equal to one-half of the wall thickness of the side wall 2123, the space size of the groove 2123a for accommodating the end of the second insulation portion 242 away from the first insulation portion 241 is improved, thereby improving the effect of the groove 2123a accommodating the end of the second insulation portion 242 away from the first insulation portion 241, effectively alleviating the phenomenon of the second insulation portion 242 pressing or scratching the electrode assembly 23 during use of the battery monomer 20, and effectively alleviating the phenomenon of the end of the second insulation portion 242 away from the first insulation portion 241 being inserted into the electrode assembly 23 during assembly of the battery monomer 20, thereby facilitating reduction of the risk of the electrode assembly 23 being damaged.

[0198] According to some embodiments of the present application, please continue to refer to FIG. 6, the outer circumferential surface of the second insulation part 242 is in interference fit with the groove bottom surface of the groove 2123a.

[0199] In the present embodiment, by setting the outer circumferential surface of the second insulation part 242 in interference fit with the groove bottom surface of the groove 2123a, the first insulation part 24 is in structure fastened in the shell 21, so that the stability of the first insulation part 24 assembled in the shell 21 can be improved, and the phenomenon of the first insulation part 24 moving or shifting during use can be alleviated, so as to improve the use reliability of the battery monomer 20.

[0200] According to some embodiments of the present application, please refer to FIG. 7 and FIG. 8, along the thickness direction X of the wall part, the end of the second insulation part 242 away from the first insulation part 241 is provided with a notch 2421, and the notch 2421 penetrates the inner circumferential surface and the outer circumferential surface of the second insulation part 242.

[0201] Among them, the end of the second insulation part 242 away from the first insulation part 241 is provided with a notch 2421, that is, the end face of the end of the second insulation part 242 away from the first insulation part 241 is provided with a notch 2421 along the thickness direction X of the wall part.

[0202] The notch 2421 penetrates the inner circumferential surface and the outer circumferential surface of the second insulation part 242, that is, the notch 2421 is in structure extending along the radial direction Y of the second insulation part, and the two ends of the notch 2421 in the radial direction Y of the second insulation part extend to the inner circumferential surface of the second insulation part 242 and the outer circumferential surface of the second insulation part 242 respectively.

[0203] In the present embodiment, by setting the notch 2421 at the end of the second insulation part 242 away from the first insulation part 241 along the thickness direction X of the wall part, and the notch 2421 is in structure penetrating the inner circumferential surface and the outer circumferential surface of the second insulation part 242, so that the second insulation part 242 is more easily deformed in the radial direction Y of the second insulation part, so as to facilitate the assembly of the first insulation part 24 into the shell 21, and then the difficulty of the interference fit between the second insulation part 242 and the groove bottom surface of the groove 2123a can be reduced, so as to reduce the difficulty of the assembly of the first insulation part 24 into the shell 21, and the assembly efficiency of the battery monomer 20 can be improved.

[0204] In some embodiments, please refer to FIG. 7, the second insulation part 242 is provided with a plurality of notches 2421, and the plurality of notches 2421 are arranged at intervals along the circumferential direction of the second insulation part 242.

[0205] In the embodiment, the plurality of notches 2421 are arranged on the second insulation part 242 to further improve the deformation capability of the second insulation part 242 in the radial direction Y of the second insulation part 242, so as to further reduce the difficulty of the interference fit between the second insulation part 242 and the bottom surface of the groove 2123a, and to further reduce the difficulty of the assembly of the first insulation member 24 into the shell 21.

[0206] According to some embodiments of the present application, as shown in FIGS. 6, 7 and 8, the electrode assembly 23 comprises a first pole piece, a second pole piece and a separation film 234, the first pole piece and the second pole piece are opposite in polarity, the first pole piece comprises a first main body and a first tab 232, the first tab 232 is connected to one end of the first main body close to the wall part 211 in the thickness direction X of the wall part, and a part of the separation film 234 is arranged between the first pole piece and the second pole piece to separate the first pole piece and the second pole piece, and a part of the separation film 234 is wrapped outside the electrode assembly 23. In the radial direction Y of the second insulation part, the projection of the notch 2421 is located in the part of the separation film 234 wrapped outside the electrode assembly 23, and the radial direction Y of the second insulation part is perpendicular to the thickness direction X of the wall part.

[0207] In the radial direction Y of the second insulation part, the projection of the notch 2421 is located in the part of the separation film 234 wrapped outside the electrode assembly 23, that is, the part of the separation film 234 wrapped outside the electrode assembly 23 covers and covers the notch 2421 in the radial direction Y of the second insulation part.

[0208] In the radial direction Y of the second insulation part, the projection of the notch 2421 is located in the part of the separation film 234 wrapped outside the electrode assembly 23, that is, the part of the separation film 234 wrapped outside the electrode assembly 23 covers and covers the notch 2421 in the radial direction Y of the second insulation part.

[0209] In the embodiment, the part of the separation film 234 separating the first and second pole pieces wraps around and covers the outside of the electrode assembly 23, so that the separation film 234 can also serve to insulate and separate the side wall 2123 of the housing 21 and the first pole piece and the side wall 2123 of the housing 21 and the second pole piece. By setting the projection of the notch 2421 on the second insulating part 242 in the radial direction Y of the second insulating part to be located in the part of the separation film 234 wrapping around the outside of the electrode assembly 23, the part of the separation film 234 wrapping around the outside of the electrode assembly 23 is configured to cover and shield the notch 2421 in the radial direction Y of the second insulating part, so that the phenomenon of the first tab 232 overlapping the side wall 2123 of the housing 21 after leaking out of the notch 2421 can be reduced, the risk of internal short circuit of the battery monomer 20 is reduced, and the use reliability of the battery monomer 20 is improved.

[0210] According to some embodiments of the present application, referring to FIG. 6, the electrode assembly 23 includes a first pole piece, a second pole piece, and a separation film 234. The first and second pole pieces have opposite polarities. The first pole piece includes a first main body and a first tab 232 connected to one end of the first main body close to the wall portion 211 in the thickness direction X of the wall portion. A part of the separation film 234 is arranged between the first and second pole pieces to separate the first and second pole pieces, and the part of the separation film 234 wraps around the outside of the electrode assembly 23. In the thickness direction X of the wall portion, the first tab 232 extends beyond the part of the separation film 234 close to the wall portion 211, and the part of the separation film 234 wrapping around the outside of the electrode assembly 23 is inserted into the accommodation space 243 close to one end of the wall portion 211.

[0211] In the thickness direction X of the wall portion, the first tab 232 extends beyond the part of the separation film 234 close to the wall portion 211, and the part of the separation film 234 wrapping around the outside of the electrode assembly 23 is inserted into the accommodation space 243 close to one end of the wall portion 211, that is, the part of the separation film 234 wrapping around the outside of the main body portion 231 of the electrode assembly 23 is inserted into the accommodation space 243 of the first insulating part 24 in the thickness direction X of the wall portion, and the first tab 232 extends beyond the separation film 234 in the thickness direction X of the wall portion.

[0212] In the embodiment, by setting the first tab 232 to protrude from the isolation film 234 towards one end of the wall portion 211 in the thickness direction X of the wall portion, so as to facilitate the electrical connection between the first tab 232 and the electrode terminal 22, the assembly difficulty between the first tab 232 and the electrode terminal 22 can be reduced, and the risk of damaging the isolation film 234 when the first tab 232 and the electrode terminal 22 are assembled and connected to each other can be reduced. In addition, by setting the portion of the isolation film 234 wrapped on the outer side of the electrode assembly 23 to be inserted into the accommodation space 243 of the first insulating member 24 in the thickness direction X of the wall portion, the portion of the second insulating portion 242 and the portion of the isolation film 234 can overlap each other in the radial direction Y of the second insulating portion, so as to improve the effect of the second insulating portion 242 of the first insulating member 24 and the isolation film 234 cooperating to insulate the side wall 2123 of the housing 21 and the second tab and the side wall 2123 of the housing 21, so as to reduce the risk of the portion of the first tab 232 exposed and lapped with the side wall 2123 of the housing 21, on the one hand, the use reliability of the battery monomer 20 can be further improved, on the other hand, there is no need to further wrap an insulating film or the like structure on the outer side of the electrode assembly 23, which is conducive to reducing the manufacturing cost of the battery monomer 20, and is conducive to optimizing the production process of the battery monomer 20.

[0213] According to some embodiments of the present application, referring to FIGS. 4, 5, 6 and 7, the battery monomer 20 can further include a first current collecting member 28, the first current collecting member 28 is arranged between the first tab 232 and the first insulating portion 241 in the thickness direction X of the wall portion, the first current collecting member 28 is connected with the first tab 232, the first insulating portion 241 is provided with a through hole 2411, the through hole 2411 is communicated with the accommodation space 243, and the electrode terminal 22 is inserted into the through hole 2411 and connected with the first current collecting member 28.

[0214] The first current collecting member 28 is arranged between the first tab 232 and the first insulating portion 241 in the thickness direction X of the wall portion, that is, in the thickness direction X of the wall portion, the first insulating portion 241 of the first insulating member 24 and the first tab 232 of the electrode assembly 23 are respectively located on the two sides of the first current collecting member 28, so that the first current collecting member 28 is located in the accommodation space 243 defined by the first insulating portion 241 and the second insulating portion 242.

[0215] The first insulating portion 241 is provided with a through hole 2411, and the through hole 2411 is communicated with the accommodation space 243, that is, the through hole 2411 on the first insulating portion 241 is a structure extending in the thickness direction X of the wall portion, and the through hole 2411 penetrates the two sides of the first insulating portion 241 in the thickness direction X of the wall portion, so that the electrode terminal 22 can extend into the accommodation space 243 through the through hole 2411, so that the first current collecting member 28 can connect the electrode terminal 22 and the first tab 232.

[0216] It should be noted that in other embodiments, the electrode terminal 22 can also be a structure not inserted into the through hole 2411, for example, a protrusion is formed on the side of the first current collecting member 28 facing the wall portion 211, the protrusion is inserted into the through hole 2411 along the thickness direction X of the wall portion and connected with the electrode terminal 22, so as to realize the electrical connection between the electrode terminal 22 and the first current collecting member 28.

[0217] Exemplarily, the connection structure between the first current collecting member 28 and the first tab 232 can be various, such as welding connection or abutting, and similarly, the connection structure between the first current collecting member 28 and the electrode terminal 22 can also be various, such as welding connection or abutting.

[0218] In the embodiment, the housing 21 is also provided with the first current collecting member 28, the first current collecting member 28 is arranged between the first insulating portion 241 and the first tab 232, and the first insulating portion 241 is provided with the through hole 2411 for inserting the electrode terminal 22, so that the first current collecting member 28 can connect the electrode terminal 22 and the first tab 232. The battery monomer 20 adopting such a structure can reduce the difficulty of electrical connection between the electrode terminal 22 and the first tab 232 on the one hand, so as to reduce the assembly difficulty of the battery monomer 20, and on the other hand, the first current collecting member 28 is also located in the containing space 243 of the first insulating member 24, so that the first insulating member 24 can insulate and isolate the first current collecting member 28 and the housing 21 while realizing the insulation and isolation of the first tab 232 and the housing 21, which is beneficial to reduce the short circuit risk between the current collecting member and the housing 21, and further reduce the short circuit risk of the battery monomer 20, so as to further improve the use reliability of the battery monomer 20.

[0219] According to some embodiments of the present application, referring to FIG. 6, the first insulating portion 241 is connected with the first current collecting member 28.

[0220] Exemplarily, the first insulating portion 241 is connected with the first current collecting member 28 on the side facing the first tab 232 in the thickness direction X of the wall portion.

[0221] Optionally, the connection structure between the first insulating portion 241 and the first current collecting member 28 can be various, such as bonding, clamping or bolted connection, etc.

[0222] In the embodiment, the first insulation part 241 of the first insulation member 24 is connected to the first current collecting member 28, so that the first insulation member 24 is fixed on the first current collecting member 28. In this way, the battery monomer 20 can improve the stability of the first insulation member 24 in the shell 21, and can prevent the first insulation member 24 from moving or shifting during use, thereby improving the use reliability of the battery monomer 20. In addition, the first insulation member 24, the first current collecting member 28 and the electrode assembly 23 can be assembled first, and then the whole is assembled into the shell 21, thereby reducing the assembly deviation between the first insulation member 24 and the electrode assembly 23, improving the assembly quality between the first insulation member 24 and the electrode assembly 23, and reducing the risk of damaging the electrode assembly 23 by the first insulation member 24 during the assembly of the electrode assembly 23 into the shell 21, thereby improving the production quality of the battery monomer 20.

[0223] In some embodiments, as shown in FIG. 6, the first insulation part 241 is adhesively connected to the first current collecting member 28.

[0224] In the thickness direction X of the wall part, an adhesive layer 30 is arranged between the first insulation part 241 and the first current collecting member 28, and the first insulation part 241 and the first current collecting member 28 are adhesively connected through the adhesive layer 30. For example, the adhesive layer 30 can be glue, double-sided tape or hot melt adhesive arranged between the first insulation part 241 and the first current collecting member 28.

[0225] In the embodiment, the first insulation part 241 of the first insulation member 24 is connected to the first current collecting member 28 by adhesion, which can reduce the connection difficulty between the first insulation member 24 and the first current collecting member 28, thereby improving the assembly efficiency of the battery monomer 20, and the connection between the first insulation member 24 and the first current collecting member 28 does not affect the first current collecting member 28, thereby reducing the damage of the first current collecting member 28.

[0226] According to some embodiments of the present application, as shown in FIGS. 5, 6 and 7, the battery monomer 20 can further include a second insulation member 25, at least part of the second insulation member 25 is arranged between the wall part 211 and the first insulation part 241, and the second insulation member 25 is configured to insulate and isolate the first current collecting member 28 and the wall part 211. Along the thickness direction X of the wall part, a limiting part 251 is arranged on the side of the second insulation member 25 away from the wall part 211, the limiting part 251 is inserted into the through hole 2411, and the limiting part 251 is located between the electrode terminal 22 and the hole wall surface of the through hole 2411.

[0227] At least part of the second insulating member 25 is arranged between the wall portion 211 and the first insulating portion 241, that is, at least part of the second insulating member 25 extends to between the wall portion 211 and the first insulating portion 241, so that in the thickness direction X of the wall portion, the wall portion 211 and the first insulating portion 241 are respectively located on both sides of the second insulating member 25.

[0228] The limiting portion 251 is inserted into the through hole 2411, and the limiting portion 251 is located between the electrode terminal 22 and the hole wall surface of the through hole 2411, that is, at least part of the limiting portion 251 extends to the through hole 2411 of the first insulating portion 241 in the thickness direction X of the wall portion, and the limiting portion 251 is located between the outer circumferential surface of the portion of the electrode terminal 22 inserted into the through hole 2411 and the hole wall surface of the through hole 2411.

[0229] Optionally, the Rockwell hardness of the second insulating member 25 is greater than or equal to 50HRC and less than or equal to 100HRC.

[0230] In the embodiment, the second insulating member 25 is further arranged in the shell 21, and at least part of the second insulating member 25 is located between the wall portion 211 and the first insulating portion 241, so that the wall portion 211 and the first current collecting member 28 can be further separated by the second insulating member 25, thereby further improving the effect of mutual insulation and isolation between the wall portion 211 and the first current collecting member 28. By protruding the limiting portion 251 on the side of the second insulating member 25 away from the wall portion 211, and inserting the limiting portion 251 into the through hole 2411 of the first insulating portion 241, the limiting portion 251 of the second insulating member 25 can also play a certain limiting and positioning role on the first insulating member 24, which is beneficial to further reduce the phenomenon of movement or displacement of the first insulating member 24 during use, and can improve the stability and quality of the assembly of the first insulating member 24 into the shell 21.

[0231] In some embodiments, referring to FIG. 6, the limiting portion 251 is arranged around the electrode terminal 22. That is, the limiting portion 251 is an annular structure extending along the circumferential direction of the hole wall surface of the through hole 2411, and the limiting portion 251 is also an annular structure surrounding the outside of the portion of the electrode terminal 22 inserted into the through hole 2411.

[0232] In the embodiment, by arranging the limiting portion 251 as an annular structure surrounding the electrode terminal 22, the limiting portion 251 is an annular structure extending along the circumferential direction of the hole wall surface of the through hole 2411, which is beneficial to further improve the limiting and positioning effect of the limiting portion 251 of the second insulating member 25 on the first insulating member 24, thereby further improving the assembly quality between the first insulating member 24 and the second insulating member 25.

[0233] In some embodiments, referring to FIG. 6, the second insulation member 25 is fixedly connected to the first insulation member 24.

[0234] Exemplarily, the structure of the fixed connection between the second insulation member 25 and the first insulation member 24 can be various, such as bonding or hot melt connection, etc.

[0235] In the present embodiment, by fixedly connecting the first insulation member 24 and the second insulation member 25, the structural stability of the assembly of the first insulation member 24 and the second insulation member 25 into the housing 21 is improved, and the phenomenon of the first insulation member 24 moving or shifting during use can be further reduced.

[0236] According to some embodiments of the present application, referring to FIG. 9 and FIG. 10, FIG. 9 is a sectional view of the battery monomer 20 provided by some embodiments of the present application, and FIG. 10 is a partial enlarged view of position B of the battery monomer 20 shown in FIG. 9. The battery monomer 20 can further include a second insulation member 25. The second insulation member 25 is arranged on the side of the wall portion 211 facing the electrode assembly 23 along the thickness direction X of the wall portion. Along the thickness direction X of the wall portion, at least part of the first insulation portion 241 is located between the second insulation member 25 and the wall portion 211, and the second insulation member 25 and the wall portion 211 are configured to cooperatively clamp the first insulation portion 241.

[0237] In which, the electrode terminal 22 has a first clamping portion 221, and along the thickness direction X of the wall portion, the first clamping portion 221 is located on the side of the wall portion 211 facing the electrode assembly 23. Correspondingly, the electrode terminal 22 also has a second clamping portion 222 located on the side of the wall portion 211 away from the electrode assembly 23 along the thickness direction X of the wall portion, and the second clamping portion 222 and the first clamping portion 221 are configured to cooperatively clamp the wall portion 211 to achieve the assembly and fastening of the electrode terminal 22 on the wall portion 211.

[0238] Exemplarily, at least part of the second insulation member 25 is arranged between the wall portion 211 and the first clamping portion 221, and the wall portion 211 and the first clamping portion 221 are configured to cooperatively clamp the second insulation member 25, that is, the second insulation member 25 is arranged in the housing 21, and at least part of the second insulation member 25 extends between the wall portion 211 and the first clamping portion 221 of the electrode terminal 22, so that the wall portion 211 and the first clamping portion 221 of the electrode terminal 22 can jointly clamp and fix the second insulation member 25 to achieve the assembly and fastening of the second insulation member 25 on the wall portion 211. It should be noted that in other embodiments, the second insulation member 25 can also be bonded, clamped or bolted to the wall portion 211, and can also be bonded, clamped or bolted to the electrode terminal 22.

[0239] At least part of the first insulation part 241 is located between the second insulation part 25 and the wall part 211, that is, at least part of the first insulation part 241 extends between the wall part 211 and the second insulation part 25, so that the wall part 211 and the second insulation part 25 can jointly clamp and fix the first insulation part 241 of the first insulation part 24 to assemble and fasten the first insulation part 24 on the wall part 211. It should be noted that in other embodiments, the first insulation part 241 of the first insulation part 24 can also be directly assembled and fastened on the wall part 211 by bonding or bolting and the like.

[0240] In this embodiment, the second insulation part 25 is arranged on the side of the wall part 211 facing the electrode assembly 23, and at least part of the first insulation part 241 of the first insulation part 24 is located between the second insulation part 25 and the wall part 211, so that the second insulation part 25 and the wall part 211 can also cooperate to assemble the first insulation part 241 to fasten the first insulation part 24 in the shell 21. The battery monomer 20 using this structure can on the one hand improve the stability of the first insulation part 24 assembled into the shell 21, which is conducive to alleviating the phenomenon of the first insulation part 24 moving or shifting during use, thereby improving the use reliability of the battery monomer 20, and can reduce the difficulty of fastening the first insulation part 24 in the shell 21, thereby reducing the assembly difficulty of the battery monomer 20, and on the other hand, the second insulation part 25 can first fix the first insulation part 24 in the shell 21, so that during the assembly of the electrode assembly 23 to the shell 21, the risk of damaging the electrode assembly 23 due to the displacement of the first insulation part 24 can be reduced, which is conducive to improving the production quality of the battery monomer 20.

[0241] In some embodiments, please continue to refer to FIGS. 9 and 10, the battery monomer 20 can also include a first current collecting member 28, the first current collecting member 28 is arranged between the first tab 232 and the wall part 211, and the first current collecting member 28 connects the electrode terminal 22 and the first tab 232. In the thickness direction X of the wall part, the second insulation part 25 is located between the wall part 211 and the first current collecting member 28, and the second insulation part 25 is also configured to insulate and isolate the wall part 211 and the first current collecting member 28.

[0242] Among them, the first current collecting member 28 is arranged between the first tab 232 and the wall part 211, and the first current collecting member 28 connects the electrode terminal 22 and the first tab 232, that is, in the thickness direction X of the wall part, the wall part 211 and the electrode assembly 23 are located on both sides of the first current collecting member 28 respectively, and the first current collecting member 28 plays a role of connecting the electrode terminal 22 and the first tab 232 of the electrode assembly 23 to realize the electrical connection between the electrode terminal 22 and the electrode assembly 23.

[0243] The second insulation member 25 is located between the wall portion 211 and the first current collecting member 28, i.e. in the thickness direction X of the wall portion, the wall portion 211 and the first current collecting member 28 are respectively located on two sides of the second insulation member 25, and correspondingly, due to the extension of at least part of the first insulation portion 241 to between the second insulation member 25 and the wall portion 211, part of the second insulation member 25 is located on the side of the first insulation portion 241 facing the first tab 232, and the first current collecting member 28 is located on the side of the first insulation portion 241 facing the first tab 232, so that the part of the second insulation member 25 is located in the accommodation space 243 defined by the first insulation portion 241 and the second insulation portion 242 together, and correspondingly, the first current collecting member 28 is also located in the accommodation space 243 defined by the first insulation portion 241 and the second insulation portion 242 together.

[0244] In FIG. 10, the first insulation portion 241 is provided with a through hole 2411 penetrating through both sides of the first insulation portion 241 in the thickness direction X of the wall portion, the electrode terminal 22 is arranged in the through hole 2411 and connected with the first current collecting member 28, and part of the second insulation member 25 is also arranged in the through hole 2411, so that the part of the second insulation member 25 can be located on the side of the first insulation portion 241 facing the first tab 232.

[0245] In the present embodiment, the first current collecting member 28 is also arranged in the shell 21, and the first current collecting member 28 is arranged between the first tab 232 and the wall portion 211, so that the first current collecting member 28 can connect the electrode terminal 22 and the first tab 232, which is conducive to reducing the difficulty of electrical connection between the electrode terminal 22 and the first tab 232. In addition, by arranging the first current collecting member 28 on the side of the second insulation member 25 away from the wall portion 211, the second insulation member 25 is arranged between the first current collecting member 28 and the wall portion 211, and the first current collecting member 28 is also located in the accommodation space 243 of the first insulation member 24, so that the first insulation member 24 can insulate the first tab 232 and the shell 21, and the first insulation member 24 and the second insulation member 25 can also insulate the first current collecting member 28 and the shell 21, which is conducive to reducing the risk of short circuit between the first current collecting member 28 and the shell 21, and further reducing the risk of short circuit of the battery monomer 20, so as to further improve the use reliability of the battery monomer 20.

[0246] In some embodiments, referring to FIG. 10, the second insulation member 25 is fixedly connected to the first insulation member 24.

[0247] For example, the structure of the fixed connection between the second insulation member 25 and the first insulation member 24 can be various, such as adhesive or hot melt connection.

[0248] In the embodiment, by fixedly connecting the first insulation member 24 and the second insulation member 25, on the one hand, the structural stability of the first insulation member 24 arranged between the wall portion 211 and the second insulation member 25 can be further improved, so as to further reduce the phenomenon of the first insulation member 24 from moving or shifting during use, and on the other hand, the first insulation member 24 and the second insulation member 25 can be fixedly assembled together and then assembled into the shell 21, which is beneficial to reduce the difficulty of assembling the first insulation member 24 between the second insulation member 25 and the wall portion 211, and can relieve the phenomenon of the first insulation member 24 from moving or shifting during the assembling process of the first insulation member 24, which is beneficial to improve the assembling quality of the first insulation member 24.

[0249] It should be noted that the structure of the battery monomer 20 is not limited to this, and in some embodiments, referring to FIGS. 11 and 12, FIG. 11 is a sectional view of a battery monomer 20 provided in some other embodiments of the present application, and FIG. 12 is a partial enlarged view of position C of the battery monomer 20 shown in FIG. 11. The battery monomer 20 can also have other structures, for example, the wall portion 211 is provided with a mounting hole 2111 penetrating the wall portion 211 along the thickness direction X of the wall portion, and part of the electrode terminal 22 is arranged in the mounting hole 2111. The electrode terminal 22 has a first clamping portion 221, which is located on the side of the wall portion 211 facing the electrode assembly 23 along the thickness direction X of the wall portion, and at least part of the first insulation portion 241 is arranged between the wall portion 211 and the first clamping portion 221 to insulate and separate the wall portion 211 and the first clamping portion 221, and the first clamping portion 221 is configured to clamp the first insulation portion 241 in cooperation with the wall portion 211.

[0250] In the embodiment, by fixedly connecting the first insulation member 24 and the second insulation member 25, on the one hand, the structural stability of the first insulation member 24 arranged between the wall portion 211 and the second insulation member 25 can be further improved, so as to further reduce the phenomenon of the first insulation member 24 from moving or shifting during use, and on the other hand, the first insulation member 24 and the second insulation member 25 can be fixedly assembled together and then assembled into the shell 21, which is beneficial to reduce the difficulty of assembling the first insulation member 24 between the second insulation member 25 and the wall portion 211, and can relieve the phenomenon of the first insulation member 24 from moving or shifting during the assembling process of the first insulation member 24, which is beneficial to improve the assembling quality of the first insulation member 24.

[0251] In the present embodiment, the electrode terminal 22 has a first clamping portion 221 located on the side of the wall portion 211 facing the electrode assembly 23 in the thickness direction X of the wall portion, and at least part of the first insulating portion 241 of the first insulating member 24 is located between the first clamping portion 221 and the wall portion 211, so that the first clamping portion 221 and the wall portion 211 can also cooperate to assemble the first insulating portion 241 to fasten the first insulating member 24 in the housing 21. The battery monomer 20 with such a structure can not only achieve the insulation isolation between the first tab 232 and the housing 21, but also achieve the insulation isolation of the first clamping portion 221 and the wall portion 211, so that it is not necessary to separately provide an insulating component between the first clamping portion 221 and the wall portion 211, which is conducive to reducing the manufacturing cost of the battery monomer 20, and on the other hand, it can improve the stability of the first insulating member 24 assembled into the housing 21, which is conducive to alleviating the phenomenon of the first insulating member 24 moving or shifting during use, so as to improve the use reliability of the battery monomer 20.

[0252] In some embodiments, referring to FIG. 12, the battery monomer 20 can also include a sealing member 27, which is arranged between the electrode terminal 22 and the wall portion 211 to seal the gap between the electrode terminal 22 and the wall portion 211. At least part of the sealing member 27 is located between the wall portion 211 and the first clamping portion 221, and the sealing member 27 abuts against the first insulating portion 241.

[0253] Wherein the main body of the electrode terminal 22 is arranged in the mounting hole 2111 along the thickness direction X of the wall portion, the first clamping portion 221 and the second clamping portion 222 are both protruded on the outer circumferential surface of the main body of the electrode terminal 22, and the first clamping portion 221 and the second clamping portion 222 are respectively located on both sides of the wall portion 211.

[0254] At least part of the sealing member 27 is located between the wall portion 211 and the first clamping portion 221, i.e. the sealing member 27 can be located between the wall portion 211 and the first clamping portion 221 in the thickness direction X of the wall portion, so that the wall portion 211 and the first clamping portion 221 can cooperate to clamp at least part of the sealing member 27. For example, in FIG. 12, part of the sealing member 27 is located between the wall portion 211 and the first clamping portion 221.

[0255] For example, in FIG. 12, the sealing member 27 and the first insulating portion 241 abut against each other along the radial direction Y of the second insulating portion. Of course, in other embodiments, the sealing member 27 and the first insulating portion 241 can also be in a structure of abutting against each other along the thickness direction X of the wall portion.

[0256] Optionally, part of the sealing member 27 is arranged between the electrode terminal 22 and the hole wall surface of the mounting hole 2111, so that the sealing member 27 can also seal the gap between the electrode terminal 22 and the hole wall surface of the mounting hole 2111, to achieve the sealing of the gap between the electrode terminal 22 and the wall portion 211 by the sealing member 27. Of course, in other embodiments, the sealing member 27 can also be a structure that is entirely located between the wall portion 211 and the first clamping portion 221, so that the sealing member 27 indirectly seals the gap between the electrode terminal 22 and the hole wall surface of the mounting hole 2111 by sealing the gap between the wall portion 211 and the first clamping portion 221.

[0257] In the present embodiment, by arranging at least part of the sealing member 27 between the wall portion 211 and the first clamping portion 221, the sealing member 27 not only plays a sealing role, but on the one hand, the first clamping portion 221 and the wall portion 211 can also play a clamping role on the sealing member 27, to improve the structural stability and reliability of the sealing member 27 assembled between the electrode terminal 22 and the hole wall surface of the mounting hole 2111, and on the other hand, by arranging the sealing member 27 and the first insulating portion 241 in abutting relationship with each other, to reduce the phenomenon of gap between the sealing member 27 and the first insulating portion 241, which is conducive to improving the effect of the first insulating portion 241 and the sealing member 27 cooperating to insulate and isolate the first clamping portion 221 and the wall portion 211, and further reducing the risk of short circuit between the first clamping portion 221 and the wall portion 211, to improve the use reliability of the battery monomer 20.

[0258] In some embodiments, the Rockwell hardness of the second insulating portion 242 is less than the Rockwell hardness of the shell 21.

[0259] For example, the material of the second insulating portion 242 is plastic, plastic or rubber, and the material of the shell 21 is copper, iron, aluminum, steel or aluminum alloy.

[0260] In the present embodiment, by setting the Rockwell hardness of the second insulating portion 242 to be less than the Rockwell hardness of the shell 21, the phenomenon of scratching or wear of the shell 21 caused by the second insulating portion 242 during assembly into the shell 21 is alleviated, which is conducive to reducing the risk of wire drawing or burr of the shell 21, to improve the production quality of the battery monomer 20.

[0261] According to some embodiments of the present application, referring to FIG. 8, along the thickness direction X of the wall portion, the radial dimension of at least part of the outer circumferential surface of the second insulating portion 242 gradually decreases from one end away from the first insulating portion 241 to one end close to the first insulating portion 241. That is, part or the whole of the outer circumferential surface of the second insulating portion 242 is outwardly inclined from one end close to the first insulating portion 241 to one end away from the first insulating portion 241.

[0262] Exemplarily, along the thickness direction X of the wall portion, the radial dimension of the entire outer circumferential surface of the second insulation portion 242 gradually decreases from the end away from the first insulation portion 241 to the end close to the first insulation portion 241.

[0263] In the present embodiment, by setting the radial dimension of at least part of the outer circumferential surface of the second insulation portion 242 to gradually decrease from the end away from the first insulation portion 241 to the end close to the first insulation portion 241, the outer circumferential surface of the second insulation portion 242 can play a certain guiding role in the process of assembling the second insulation portion 242 of the first insulation member 24 into the shell 21, which is conducive to reducing the difficulty of mutual assembly of the second insulation portion 242 and the shell 21, thereby improving the assembly efficiency of the battery monomer 20.

[0264] According to some embodiments of the present application, please refer to FIG. 8, along the thickness direction X of the wall portion, the thickness of the first insulation portion 241 is greater than or equal to 0.3 mm and less than or equal to 1.2 mm. That is, in FIG. 8, the thickness of the first insulation portion 241 in the thickness direction X of the wall portion is D2, which satisfies 0.3 mm≤D2≤1.2 mm, that is, the wall thickness of the first insulation portion 241 is D2.

[0265] Exemplarily, the thickness D2 of the first insulation portion 241 in the thickness direction X of the wall portion can be 0.3 mm, 0.32 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 1.05 mm, 1.1 mm, 1.15 mm or 1.2 mm, etc.

[0266] It should be noted that the thickness D2 of the first insulation portion 241 is the thickness of the mostly flat area in the first insulation portion 241 in the thickness direction X of the wall portion, without considering the locally protruding or recessed area in the first insulation portion 241.

[0267] In the embodiment, the thickness of the first insulation part 241 of the first insulation member 24 is 0.3 mm to 1.2 mm. On one hand, by setting the thickness of the first insulation part 241 to be greater than or equal to 0.3 mm, the structural strength of the first insulation part 241 is improved, which is conducive to improving the effect of insulating and isolating the first tab 232 and the shell 21 by the first insulation part 241 and alleviating the phenomenon of damage or warping of the first insulation part 241 during use, thereby effectively improving the stability and reliability of the first insulation part 241 in insulating and isolating the first tab 232 and the shell 21. On the other hand, by setting the thickness of the first insulation part 241 to be less than or equal to 1.2 mm, the phenomenon of the first insulation part 241 occupying too much space in the shell 21 is alleviated, thereby improving the space utilization rate inside the shell 21 to improve the energy density of the battery monomer 20.

[0268] According to some embodiments of the present application, please continue to refer to FIG. 8, the thickness of the second insulation part 242 is greater than or equal to 0.05 mm and less than or equal to 0.5 mm. That is, in FIG. 8, the thickness of the second insulation part 242 in the radial direction Y of the second insulation part is D3, which satisfies 0.05 mm≤D3≤0.5 mm, that is, the wall thickness of the second insulation part 242 is D3.

[0269] Exemplarily, the thickness D3 of the second insulation part 242 in the radial direction Y of the second insulation part can be 0.05 mm, 0.06 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.48 mm or 0.5 mm, etc.

[0270] It should be noted that the thickness of the second insulation part 242 is greater than or equal to 0.05 mm and less than or equal to 0.5 mm, that is, the thickness of any position of the second insulation part 242 in the radial direction Y of the second insulation part satisfies greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

[0271] In the embodiment, the thickness of the second insulation part 242 of the first insulation piece 24 is 0.05mm to 0.5mm. On one hand, by setting the thickness of the second insulation part 242 to be greater than or equal to 0.05mm, the structural strength of the second insulation part 242 is improved, which is conducive to improving the effect of insulating the first tab 232 and the shell 21 by the second insulation part 242 and alleviating the damage or warping of the second insulation part 242 during use, thereby effectively improving the stability and reliability of the second insulation part 242 in insulating the first tab 232 and the shell 21. On the other hand, by setting the thickness of the second insulation part 242 to be less than or equal to 0.5mm, the phenomenon of the second insulation part 242 occupying too much space in the shell 21 is alleviated, thereby improving the space utilization inside the shell 21 and improving the energy density of the battery monomer 20.

[0272] According to some embodiments of the application, referring to FIGS. 7 and 8, the first insulation part 241 and the second insulation part 242 are integrally formed. That is, the first insulation part 241 and the second insulation part 242 are an integrated structure formed by an integral molding process.

[0273] Exemplarily, the first insulation part 241 and the second insulation part 242 of the first insulation piece 24 can be formed by an integral molding process such as injection molding, milling, etc.

[0274] It should be noted that in other embodiments, the first insulation part 241 and the second insulation part 242 can also be a split structure, that is, the first insulation part 241 and the second insulation part 242 are a split structure, and the first insulation part 241 and the second insulation part 242 can be connected to each other by bonding or clamping structure, etc.

[0275] In the embodiment, by setting the first insulation part 241 and the second insulation part 242 of the first insulation piece 24 to be an integrally formed structure, the first insulation part 241 and the second insulation part 242 are an integrated structure, thereby improving the connection strength between the first insulation part 241 and the second insulation part 242 to reduce the phenomenon of the first insulation part 241 and the second insulation part 242 separating from each other, which is conducive to improving the stability and reliability of the first insulation piece 24 during use.

[0276] In some embodiments, referring to FIG. 8, along the thickness direction X of the wall portion, the thickness of the second insulation portion 242 gradually increases from the end away from the first insulation portion 241 to the end close to the first insulation portion 241. That is, the thickness of the end of the second insulation portion 242 connected to the first insulation portion 241 is the largest, so that the thickness of the end of the second insulation portion 242 connected to the first insulation portion 241 is the maximum thickness of the second insulation portion 242, and the thickness of the end of the second insulation portion 242 away from the first insulation portion 241 is the smallest, so that the thickness of the end of the second insulation portion 242 away from the first insulation portion 241 is the minimum thickness of the second insulation portion 242.

[0277] In the present embodiment, by setting the thickness of the second insulation portion 242 to gradually increase from the end away from the first insulation portion 241 to the end close to the first insulation portion 241, the second insulation portion 242 is configured to have a larger thickness at the end connected to the first insulation portion 241, thereby on the one hand facilitating the connection reliability between the second insulation portion 242 and the first insulation portion 241, and facilitating the structural stability of the first insulation member 24 as a whole, and on the other hand reducing the forming difficulty of the first insulation portion 241 and the second insulation portion 242, so as to reduce the manufacturing difficulty of the first insulation member 24.

[0278] According to some embodiments of the present application, referring to FIGS. 3, 4 and 5, the side wall 2123 is in a cylindrical shape, and the central axis of the side wall 2123 extends along the thickness direction X of the wall portion.

[0279] In the present embodiment, by setting the side wall 2123 of the shell 21 to be in a cylindrical shape, the shell 21 is in a cylindrical structure, and the central axis of the shell 21 extends along the thickness direction X of the wall portion. Correspondingly, the end cover 213 of the shell 21 is in a circular plate shape, and the bottom wall 2122 of the shell 212 is also in a circular plate shape, so that the side wall 2123 is in a hollow structure in a cylindrical shape with both ends open along the central axis.

[0280] It should be noted that in other embodiments, the shape of the side wall 2123 can also be a cuboid, a square or a prism, etc.

[0281] In the present embodiment, by setting the side wall 2123 of the shell 21 to be in a cylindrical shape, the shell 21 is in a cylindrical shape, so as to facilitate the processing of the battery monomer 20 in a cylindrical structure, so that the battery monomer 20 has the advantages of high capacity, long cycle life, wide use environment temperature, etc. In addition, by setting the shell 21 to be in a cylindrical shape, the electrode assembly 23 can be set to be in a cylindrical structure with the central axis extending along the thickness direction X of the wall portion, so as to facilitate the insertion of the first tab 232 of the electrode assembly 23 into the accommodation space 243 of the first insulation member 24, and reduce the manufacturing difficulty of the first insulation member 24.

[0282] According to some embodiments of the present application, referring to FIG. 3, FIG. 4 and FIG. 5, the shell 21 can include a housing 212 and an end cover 213, the housing 212 includes an integrally formed side wall 2123 and a bottom wall 2122, the side wall 2123 is arranged around the bottom wall 2122, one end of the side wall 2123 is connected to the bottom wall 2122 in the thickness direction X of the wall portion, and the other end of the side wall 2123 is closed to form an opening 2121, the side wall 2123 and the bottom wall 2122 jointly define a containing cavity, the electrode assembly 23 is contained in the containing cavity, and the end cover 213 closes the opening 2121. The bottom wall 2122 is the wall portion 211.

[0283] The housing 212 includes an integrally formed side wall 2123 and a bottom wall 2122, that is, the housing 212 is processed by an integrally forming process, such as stamping, casting or extrusion forming, etc. That is, the side wall 2123 and the bottom wall 2122 of the housing 212 are of an integral structure.

[0284] The bottom wall 2122 is the wall portion 211, that is, the wall portion 211 is a wall of the housing 212 arranged opposite to the end cover 213 in the thickness direction X of the wall portion, and correspondingly, the electrode terminal 22 is installed on the bottom wall 2122 of the housing 212. Correspondingly, the first tab 232 is arranged on one end of the electrode assembly 23 facing the bottom wall 2122 of the housing 212 in the thickness direction X of the wall portion, and similarly, the first insulating part 241 of the first insulating member 24 is located between the first tab 232 and the bottom wall 2122 of the housing 212.

[0285] In the present embodiment, by arranging the wall portion 211 of the shell 21 as the bottom wall 2122 of the housing 212 arranged opposite to the end cover 213 in the thickness direction X of the wall portion, the battery monomer 20 with such a structure can make the wall portion 211 provided with the electrode terminal 22 away from the end cover 213, so that there is no direct connection relationship between the wall portion 211 and the end cover 213, thereby relieving the phenomenon that the force generated when the wall portion 211 is pulled or twisted by components such as the electrode terminal 22 acts on the end cover 213, so as to reduce the risk of connection failure between the end cover 213 and the housing 212, and further to reduce the risk of liquid leakage of the battery monomer 20 in use.

[0286] It should be noted that the structure of the battery monomer 20 is not limited to this, and in some embodiments, the battery monomer 20 can also be other structures, for example, the shell 21 can include a shell body 212 and an end cover 213, the shell body 212 includes an integrally formed side wall 2123 and a bottom wall 2122, the side wall 2123 is arranged around the bottom wall 2122, and one end of the side wall 2123 is connected to the bottom wall 2122 in the thickness direction X of the wall portion, and the other end is closed to form an opening 2121, the side wall 2123 and the bottom wall 2122 jointly define a containing cavity, and the electrode assembly 23 is contained in the containing cavity, and the end cover 213 closes the opening 2121, and the end cover 213 is the wall portion 211. That is, the electrode terminal 22 is mounted on the end cover 213 of the shell 21, and correspondingly, the first tab 232 is arranged on one end of the electrode assembly 23 facing the end cover 213 in the thickness direction X of the wall portion, and the first insulating part 241 of the first insulating part 24 is located between the first tab 232 and the end cover 213.

[0287] In this embodiment, by arranging the wall portion 211 of the shell 21 as the end cover 213 used to close the opening 2121 of the shell body 212, the battery monomer 20 adopting this structure facilitates the assembly of the electrode terminal 22 on the end cover 213 and facilitates the electrical connection between the electrode terminal 22 and the first tab 232, which is beneficial to reduce the assembly difficulty of the battery monomer 20 and improve the production efficiency of the battery monomer 20.

[0288] According to some embodiments of the present application, the present application also provides a battery 100, which includes the battery monomer 20 of any one of the above schemes.

[0289] Among them, referring to FIG. 2, the battery 100 can also include a box body 10, and the battery monomer 20 is contained in the box body 10.

[0290] 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 closed, and the first box body 11 and the second box body 12 jointly define an assembly space for containing the battery monomer 20.

[0291] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-shaped structure, the first box body 11 is closed to the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 is closed to the open side of the second box body 12.

[0292] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid, etc. Exemplarily, in FIG. 2, the box body 10 is in a cuboid structure.

[0293] Optionally, the battery monomer 20 arranged in the box body 10 can be one or multiple. Exemplarily, in FIG. 2, multiple battery monomers 20 are arranged in the box body 10 of the battery 100, and the multiple battery monomers 20 can be in series connection, parallel connection or mixed connection, where the mixed connection means that the multiple battery monomers 20 are in both series connection and parallel connection. The multiple battery monomers 20 can be directly connected in series, parallel or mixed connection, and then the whole of the multiple battery monomers 20 is contained in the box body 10; of course, the battery 100 can also be in the form that the multiple battery monomers 20 are first connected in series, parallel or mixed connection to form a battery module, and then the multiple battery modules are connected in series, parallel or mixed connection to form a whole, and the whole is contained in the box body 10.

[0294] The battery 100 can further include other structures, for example, the battery 100 can further include a current collecting component connected to the multiple battery monomers 20 to realize the electrical connection between the multiple battery monomers 20.

[0295] It should be noted that in some embodiments, the battery 100 can also not be provided with the box body 10, and the battery 100 includes the multiple battery monomers 20, and the battery 100 composed of the multiple battery monomers 20 can be directly assembled to the electric device to provide the electric device with electric energy through the multiple battery monomers 20. That is, the box body 10 can be part of the electric device. Taking the vehicle 1000 as an example of the electric device, the box body 10 can be part of the chassis structure of the vehicle 1000, for example, part of the box body 10 can be at least part of the floor of the vehicle 1000, or part of the box body 10 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.

[0296] According to some embodiments of the present application, the present application further provides an electric device, which includes the battery monomer 20 of any one of the above solutions, and the battery monomer 20 is used to provide the electric device with electric energy.

[0297] The electric device can be any one of the devices or systems to which the battery monomer 20 is applied.

[0298] 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.

[0299] The above merely provides preferred embodiments 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 modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A battery cell, comprising: a housing having a wall portion and a side wall surrounding the wall portion; an electrode terminal provided on the wall portion; an electrode assembly accommodated in the housing, the electrode assembly having a first tab provided at one end of the electrode assembly close to the wall portion in a thickness direction of the wall portion, the first tab being electrically connected to the electrode terminal; and a first insulating member including a first insulating portion at least partially located between the wall portion and the first tab, and a second insulating portion surrounding the first insulating portion, the second insulating portion and the first insulating portion together defining an accommodation space, one end of the second insulating portion being connected to the first insulating portion in the thickness direction of the wall portion, and at least a portion of the first tab being inserted into the accommodation space; wherein a groove is provided on an inner circumferential surface of the side wall, and one end of the second insulating portion away from the first insulating portion is inserted into the groove. The electrode assembly includes a first tab, the first tab including a first main body and the first tab, the first tab being connected to one end of the first main body close to the wall portion in the thickness direction of the wall portion; 2. The battery cell of claim 1, wherein, wherein one end of the second insulating portion away from the first insulating portion extends to between the first main body and the side wall in the thickness direction of the wall portion, and the first tab is located in the accommodation space as a whole. The groove is an annular groove extending in a circumferential direction of the side wall.

3. The battery cell of claim 1 or 2, wherein, A wall thickness of the side wall is D1, and a groove depth of the groove is H, satisfying 1 / 3≤H / D1≤1 / 2.

4. The battery cell of any one of claims 1-3, wherein, An outer circumferential surface of the second insulating portion is in interference fit with a groove bottom surface of the groove.

5. The battery cell of any one of claims 1-4, wherein, One end of the second insulating portion away from the first insulating portion is provided with a notch in the thickness direction of the wall portion, the notch penetrating through the inner circumferential surface and the outer circumferential surface of the second insulating portion.

6. The battery cell of claim 5, wherein, The second insulating portion is provided with a plurality of notches, and the plurality of notches are arranged at intervals in a circumferential direction of the second insulating portion.

7. The battery cell of claim 6, wherein, The electrode assembly includes a first tab, a second tab and a separator, polarities of the first tab and the second tab are opposite, the first tab includes a first main body and the first tab, the first tab being connected to one end of the first main body close to the wall portion in the thickness direction of the wall portion, and a portion of the separator is provided between the first tab and the second tab to separate the first tab and the second tab, and a portion of the separator is wrapped outside the electrode assembly; 8. The battery cell of claim 6 or 7, wherein, wherein a projection of the notch is located in a portion of the separator wrapped outside the electrode assembly in a radial direction of the second insulating portion, and the radial direction of the second insulating portion is perpendicular to the thickness direction of the wall portion. ​ 9. The battery cell of any one of claims 1-8, wherein, The electrode assembly includes a first tab, a second tab, and a separator, the first tab and the second tab have opposite polarities, the first tab includes a first main body and a first tab lug connected to one end of the first main body near the wall portion in the thickness direction of the wall portion, and a portion of the separator is disposed between the first tab and the second tab to separate the first tab and the second tab, and a portion of the separator is wrapped outside the electrode assembly; Wherein, along the thickness direction of the wall portion, the first tab lug protrudes beyond the separator near one end of the wall portion, and the portion of the separator wrapped outside the electrode assembly near one end of the wall portion is inserted into the accommodation space.

10. The battery cell of any one of claims 1-9, wherein, The battery cell further includes: A first current collecting member is disposed between the first tab lug and the first insulating portion in the thickness direction of the wall portion, the first current collecting member is connected to the first tab lug, the first insulating portion is provided with a through hole, the through hole is in communication with the accommodation space, and the electrode terminal is inserted into the through hole and connected to the first current collecting member.

11. The battery cell of claim 10, wherein, The first insulating portion is connected to the first current collecting member.

12. The battery cell of claim 11, wherein, The first insulating portion is adhesively connected to the first current collecting member.

13. The battery cell of any one of claims 10-12, wherein, The battery cell further includes: A second insulating member is at least partially disposed between the wall portion and the first insulating portion, and the second insulating member is configured to insulate and separate the first current collecting member and the wall portion; Wherein, along the thickness direction of the wall portion, a limiting portion is protruded from one side of the second insulating member away from the wall portion, the limiting portion is inserted into the through hole, and the limiting portion is located between the electrode terminal and the hole wall surface of the through hole.

14. The battery cell of claim 13, wherein, The limiting portion is arranged around the electrode terminal.

15. The battery cell of claim 13 or 14, wherein, The second insulating member is fixedly connected to the first insulating member.

16. The battery cell of any one of claims 1-9, wherein, The battery cell further includes: A second insulating member is disposed on the side of the wall portion facing the electrode assembly in the thickness direction of the wall portion; Wherein, along the thickness direction of the wall portion, at least a portion of the first insulating portion is located between the second insulating member and the wall portion.

17. The battery cell of claim 16, wherein, The battery cell further includes: A first current collecting member is disposed between the first tab lug and the wall portion, and the first current collecting member connects the electrode terminal and the first tab lug; Wherein, along the thickness direction of the wall portion, the second insulating member is located between the wall portion and the first current collecting member, and the second insulating member is further configured to insulate and separate the wall portion and the first current collecting member.

18. The battery cell of claim 16 or 17, wherein, The second insulating member is fixedly connected to the first insulating member.

19. The battery cell of any one of claims 1-9, wherein, The wall portion is provided with a mounting hole penetrating through the wall portion in the thickness direction of the wall portion, and a portion of the electrode terminal is inserted into the mounting hole; Wherein, the electrode terminal has a first clamping portion, along the thickness direction of the wall portion, the first clamping portion is located on the side of the wall portion facing the electrode assembly, and at least a portion of the first insulating portion is disposed between the wall portion and the first clamping portion to insulate and separate the wall portion and the first clamping portion.

20. The battery cell of claim 19, wherein, The battery cell further includes: A sealing member is located at least partially between the wall portion and the first clamping portion, and abuts against the first insulating portion.

21. The battery cell of any one of claims 1-20, wherein, The second insulating portion has a Rockwell hardness less than that of the outer shell.

22. The battery cell of any one of claims 1-21, wherein, In a thickness direction of the wall portion, a radial dimension of at least a portion of an outer circumferential surface of the second insulating portion gradually decreases from one end away from the first insulating portion to one end close to the first insulating portion.

23. The battery cell of any one of claims 1-22, wherein, In the thickness direction of the wall portion, a thickness of the first insulating portion is greater than or equal to 0.3 mm and less than or equal to 1.2 mm.

24. The battery cell of any one of claims 1-23, wherein, A thickness of the second insulating portion is greater than or equal to 0.05 mm and less than or equal to 0.5 mm.

25. The battery cell of any one of claims 1-24, wherein, The first insulating portion is integrally formed with the second insulating portion.

26. The battery cell of claim 25, wherein, In the thickness direction of the wall portion, a thickness of the second insulating portion gradually increases from one end away from the first insulating portion to one end close to the first insulating portion.

27. The battery cell of any one of claims 1-26, wherein, The side wall is in a cylindrical shape, and a central axis of the side wall extends in the thickness direction of the wall portion.

28. The battery cell of any one of claims 1-27, wherein, The outer shell comprises: A shell body comprising the side wall and a bottom wall integrally formed, the side wall being surrounded by the bottom wall, one end of the side wall being connected to the bottom wall in the thickness direction of the wall portion, and the other end of the side wall being closed to form an opening, the side wall and the bottom wall jointly defining a receiving cavity, and the electrode assembly being received in the receiving cavity; An end cover closing the opening; The bottom wall is the wall portion; or The end cover is the wall portion.

29. A battery comprising the battery cell of any one of claims 1-28.

30. An electric device comprising the battery cell of any one of claims 1-28, the battery cell being configured to provide electric energy.

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