Cylindrical battery monomer, battery and electric equipment

Abstract

The invention provides a cylindrical battery monomer, a battery and electric equipment. The cylindrical battery monomer comprises a shell, an electrode assembly and an elastic insulating part, wherein the electrode assembly is accommodated in the shell. The electrode assembly comprises a first pole piece, a second pole piece and a separator, the polarity of the first pole piece is opposite to that of the second pole piece, and the first pole piece, the separator and the second pole piece are arranged in a winding mode. The housing includes a sidewall disposed around the electrode assembly. The elastic insulating part is arranged between the electrode assembly and the side wall, and the elastic insulating part abuts against the outer surface of the electrode assembly and the inner surface of the side wall. The elastic insulating part can fill the gap between the electrode assembly and the side wall, so that expansion of the electrode assembly is inhibited to a certain extent, the risk of excessive expansion of the electrode assembly is reduced, the slippage of the pole piece is reduced, shear force generated in the slippage process is reduced, the risk of cracking of the pole piece is reduced, and the risk that burrs generated at the cracking position pierce the isolating part is reduced; and the reliability of the cylindrical battery monomer is improved.

Description

Cylindrical battery cell, battery and electric device TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a cylindrical battery cell, a battery and an electric device. BACKGROUND

[0002] Batteries are widely used in the field of new energy, for example, electric vehicles, new energy vehicles and the like. New energy vehicles and electric vehicles have become a new trend in the development of the automobile industry. The development of battery technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and the like. In addition, the reliability of the battery also needs to be considered. However, the cylindrical battery cell using a wound electrode assembly has poor reliability.

[0003] SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a cylindrical battery cell, a battery and an electric device, which aims to improve the problem of poor reliability of the cylindrical battery cell in the related art.

[0005] In a first aspect, the embodiments of the present application provide a cylindrical battery cell, which comprises a shell, an electrode assembly and an elastic insulating piece. The electrode assembly is accommodated in the shell. The electrode assembly comprises a first electrode plate, a second electrode plate and a separator. The first electrode plate and the second electrode plate have opposite polarities. The first electrode plate, the separator and the second electrode plate are wound and arranged. The shell comprises a side wall arranged around the electrode assembly. The elastic insulating piece is arranged between the electrode assembly and the side wall, and the elastic insulating piece abuts the outer surface of the electrode assembly and the inner surface of the side wall, respectively.

[0006] In the above technical solution, the cylindrical battery cell is provided with an elastic insulating piece between the electrode assembly and the side wall of the shell. The elastic insulating piece abuts the outer surface of the electrode assembly and the inner surface of the side wall, respectively, fills the gap between the electrode assembly and the side wall, reduces the expansion space of the electrode assembly, to a certain extent, inhibits the expansion of the electrode assembly, reduces the risk of excessive expansion of the electrode assembly, reduces the amount of slip of the electrode plate, reduces the shear force generated in the process of slip, thereby reducing stress concentration, reducing the risk of cracking of the electrode plate, and improving the reliability of the cylindrical battery cell. In addition, the elastic insulating piece has a certain elasticity, which can allow the electrode assembly to expand to a certain extent, so that the pressure on the electrode assembly is not too large, thereby reducing the risk of extrusion of the electrolyte in the electrode assembly, and being beneficial to maintaining the performance of the electrode assembly.

[0007] As an optional technical solution of the embodiments of the present application, the cylindrical battery cell comprises a plurality of elastic insulating pieces, and the plurality of elastic insulating pieces are arranged at intervals along the axial direction of the cylindrical battery cell.

[0008] In the above technical solution, by arranging multiple elastic insulation pieces and spacing the multiple elastic insulation pieces along the axial direction of the cylindrical battery monomer, the multiple elastic insulation pieces can effectively suppress the expansion of the electrode assembly at multiple positions along the axial direction of the cylindrical battery monomer, thereby reducing the risk of the electrode tab cracking and improving the reliability of the cylindrical battery monomer. In addition, the two adjacent elastic insulation pieces are spaced along the axial direction of the cylindrical battery monomer, which can reduce the material consumption of the elastic insulation piece and reduce the cost of the cylindrical battery monomer.

[0009] As an optional technical solution of the embodiment of the present application, the cylindrical battery monomer includes two elastic insulation pieces, and along the axial direction of the cylindrical battery monomer, the spacer includes two end regions, and the two elastic insulation pieces are arranged around the two end regions, respectively.

[0010] In the above technical solution, by arranging two elastic insulation pieces, along the axial direction of the cylindrical battery monomer, the two elastic insulation pieces are arranged around the two end regions of the spacer, which can effectively suppress the expansion of the electrode assembly, reduce the risk of the electrode tab cracking, improve the reliability of the cylindrical battery monomer, reduce the material consumption of the elastic insulation piece, and reduce the cost of the cylindrical battery monomer.

[0011] As an optional technical solution of the embodiment of the present application, along the axial direction of the cylindrical battery monomer, the length of the elastic insulation piece is L1, and the length of the spacer is L2, and 0.1≤L1 / L2≤0.3 is satisfied.

[0012] When L1 / L2≥0.1, the length of the elastic insulation piece along the axial direction of the cylindrical battery monomer is large, which can effectively suppress the expansion of the electrode assembly, reduce the amount of electrode tab sliding, reduce the shear force generated during the sliding process, thereby reducing stress concentration, reducing the risk of electrode tab cracking, and improving the reliability of the cylindrical battery monomer. When L1 / L2≤0.3, the length of the elastic insulation piece along the axial direction of the cylindrical battery monomer is not too large, which is conducive to reducing the cost of the cylindrical battery monomer. Therefore, when 0.1≤L1 / L2≤0.3, the reliability of the cylindrical battery monomer and the cost of the cylindrical battery monomer can be considered.

[0013] As an optional technical solution of the embodiment of the present application, 0.15≤L1 / L2≤0.25.

[0014] In the technical solution, when L1 / L2 is greater than or equal to 0.15, the length of the elastic insulation part along the axial direction of the cylindrical battery cell is greater, which can effectively inhibit the expansion of the electrode assembly, further reduce the sliding amount of the pole piece, reduce the shear force generated in the sliding process, thereby further reducing stress concentration, further reducing the risk of pole piece cracking, and improving the reliability of the cylindrical battery cell. When L1 / L2 is less than or equal to 0.25, the length of the elastic insulation part along the axial direction of the cylindrical battery cell is not too large, which is conducive to reducing the cost of the cylindrical battery cell. Therefore, when 0.15≤L1 / L2≤0.25, the reliability and cost of the cylindrical battery cell can be considered.

[0015] As an optional technical solution of the embodiment, the elastic insulation part is one, and along the axial direction of the cylindrical battery cell, the length of the elastic insulation part is L1, and the length of the isolation part is L2, and 0.5≤L1 / L2≤1.2 is met.

[0016] In the technical solution, when the elastic insulation part is one and L1 / L2 is greater than or equal to 0.5, the length of the elastic insulation part along the axial direction of the cylindrical battery cell is greater, which can effectively inhibit the expansion of the electrode assembly, reduce the sliding amount of the pole piece, reduce the shear force generated in the sliding process, thereby reducing stress concentration, reducing the risk of pole piece cracking, and improving the reliability of the cylindrical battery cell. When the elastic insulation part is one and L1 / L2 is less than or equal to 1.2, the length of the elastic insulation part along the axial direction of the cylindrical battery cell is not too large, which is conducive to reducing the cost of the cylindrical battery cell. Therefore, when the elastic insulation part is one and 0.5≤L1 / L2≤1.2, the reliability and cost of the cylindrical battery cell can be considered.

[0017] As an optional technical solution of the embodiment, along the axial direction of the cylindrical battery cell, the two ends of the elastic insulation part are flush with the two ends of the isolation part.

[0018] In the technical solution, when along the axial direction of the cylindrical battery cell, the two ends of the elastic insulation part are flush with the two ends of the isolation part, the length of the elastic insulation part is equal to the length of the isolation part, that is, L1=L2. At this time, the elastic insulation part is completely wrapped in the isolation part along the axial direction of the cylindrical battery cell, which can effectively inhibit the expansion of the electrode assembly, further reduce the sliding amount of the pole piece, reduce the shear force generated in the sliding process, thereby further reducing stress concentration, further reducing the risk of pole piece cracking, and improving the reliability of the cylindrical battery cell.

[0019] As an optional technical solution of the embodiment of the application, the elastic insulation member is arranged around the electrode assembly along the circumferential direction of the cylindrical battery monomer, the elastic insulation member has a leading end and a trailing end, the leading end and the trailing end are arranged at intervals, and a gap region not covering the electrode assembly is formed between the leading end and the trailing end.

[0020] In the above technical solution, by arranging the elastic insulation member around the electrode assembly along the circumferential direction of the cylindrical battery monomer, the gap between the electrode assembly and the side wall can be better filled, the expansion space of the electrode assembly is reduced, the expansion of the electrode assembly is inhibited, the sliding amount of the pole piece is reduced, the shear force generated in the sliding process is reduced, thereby reducing stress concentration and reducing the risk of pole piece cracking, and the reliability of the cylindrical battery monomer is improved. In addition, by forming the gap region not covering the electrode assembly between the leading end and the trailing end, on the one hand, the material consumption of the elastic insulation member can be reduced, and the cost of the cylindrical battery monomer can be reduced. On the other hand, due to the existence of the gap region, the leading end and the trailing end are not easy to overlap together to form an overlapping region (the overlapping region has a relatively thick thickness, and the overlapping region can cause stress concentration of the electrode assembly), and stress concentration of the electrode assembly is not easy to cause, which is beneficial to improve the reliability of the cylindrical battery monomer.

[0021] As an optional technical solution of the embodiment of the application, the first pole piece has a first end, and part of the second pole piece exceeds the first end in the winding direction of the electrode assembly, the second pole piece includes a pole piece located at the outermost circle of the electrode assembly, the second pole piece has a second end, and the second end is located in the gap region.

[0022] In the above technical solution, the second end is located in the gap region, that is, the position of the gap region corresponds to the position of the second end. The diameter corresponding to the position of the second end of the electrode assembly is relatively large. By corresponding the position of the gap region to the position of the second end, the elastic insulation member does not need to cover the position of the second end, so that the material consumption of the elastic insulation member can be reduced to a large extent, and the cost of the cylindrical battery monomer can be reduced.

[0023] As an optional technical solution of the embodiment of the application, the length of the gap region is L3 along the circumferential direction of the cylindrical battery monomer, the total length of the elastic insulation member and the gap region is L4, and L3 / L4≤0.5 is satisfied.

[0024] In the technical solution, when L3 / L4≤0.5, the length of the notch area along the circumference of the cylindrical battery monomer is short, the elastic insulation piece can be arranged on the outside of the electrode assembly along the circumference of the cylindrical battery monomer to a large extent, the gap between the electrode assembly and the side wall is filled well, the expansion space of the electrode assembly is reduced, the expansion of the electrode assembly is inhibited well, the slip amount of the pole piece is reduced, the shear force generated in the slip process is reduced, the risk of pole piece cracking is reduced, and the reliability of the cylindrical battery monomer is improved.

[0025] As an optional technical solution of the embodiment, 0.1≤L3 / L4≤0.4.

[0026] In the technical solution, when L3 / L4≤0.4, the length of the notch area along the circumference of the cylindrical battery monomer is shorter, the elastic insulation piece can be arranged on the outside of the electrode assembly along the circumference of the cylindrical battery monomer to a larger extent, the gap between the electrode assembly and the side wall is filled well, the expansion space of the electrode assembly is reduced, the expansion of the electrode assembly is inhibited well, the slip amount of the pole piece is reduced, the shear force generated in the slip process is reduced, the risk of pole piece cracking is reduced, and the reliability of the cylindrical battery monomer is improved. When L3 / L4≥0.1, the length of the notch area is not too short, the material consumption of the elastic insulation piece is reduced, the cost of the cylindrical battery monomer is reduced, and the risk of the first end and the tail end overlapping together to form the overlapping area is also reduced. Therefore, when 0.1≤L3 / L4≤0.4, the reliability and the cost of the cylindrical battery monomer can be considered.

[0027] As an optional technical solution of the embodiment, 1mm≤L3≤5mm.

[0028] In the technical solution, when L3≤5mm, the length of the notch area along the circumference of the cylindrical battery monomer is short, the elastic insulation piece can be arranged on the outside of the electrode assembly along the circumference of the cylindrical battery monomer to a large extent, the gap between the electrode assembly and the side wall is filled well, the expansion space of the electrode assembly is reduced, the expansion of the electrode assembly is inhibited well, the slip amount of the pole piece is reduced, the shear force generated in the slip process is reduced, the risk of pole piece cracking is reduced, and the reliability of the cylindrical battery monomer is improved. When L3≥1mm, the length of the notch area is not too short, the material consumption of the elastic insulation piece is reduced, the cost of the cylindrical battery monomer is reduced, and the risk of the first end and the tail end overlapping together to form the overlapping area is also reduced. Therefore, when 1mm≤L3≤5mm, the reliability and the cost of the cylindrical battery monomer can be considered.

[0029] As an optional technical solution of the embodiment, the first end is located at the notch area.

[0030] In the technical solution, the first end is located in the notch region, that is, the position of the notch region corresponds to the position of the first end. The diameter of the electrode assembly at the position of the first end is relatively large. By corresponding the position of the notch region to the position of the first end, the elastic insulation member does not need to cover the position of the first end, thereby reducing the material consumption of the elastic insulation member to a great extent and reducing the cost of the cylindrical battery cell.

[0031] As an optional technical solution of the embodiment, the elastic insulation member is wrapped around the electrode assembly along the circumference of the cylindrical battery cell.

[0032] In the technical solution, by wrapping the elastic insulation member around the electrode assembly along the circumference of the cylindrical battery cell, the expansion of the electrode assembly can be more effectively inhibited, the slip amount of the electrode plate can be further reduced, the shear force generated in the slip process can be reduced, the stress concentration can be further reduced, the risk of electrode plate cracking can be further reduced, and the reliability of the cylindrical battery cell can be improved.

[0033] As an optional technical solution of the embodiment, the elastic insulation member is an annular structure arranged around the electrode assembly.

[0034] In the technical solution, the elastic insulation member is an annular structure. On the one hand, the expansion of the electrode assembly can be effectively inhibited, the risk of electrode plate cracking can be reduced, and the reliability of the cylindrical battery cell can be improved. On the other hand, when the elastic insulation member is arranged outside the electrode assembly, there is no overlapping area, which is not easy to cause stress concentration of the electrode assembly, and is beneficial to improve the reliability of the cylindrical battery cell.

[0035] As an optional technical solution of the embodiment, the material of the elastic insulation member includes oriented polystyrene.

[0036] In the technical solution, the oriented polystyrene can expand greatly when absorbing electrolyte. Before the elastic insulation member absorbs electrolyte, the volume of the elastic insulation member is relatively small, so that the elastic insulation member can be arranged between the electrode assembly and the side wall. Then, the elastic insulation member expands by absorbing the electrolyte in the cylindrical battery cell, fills the gap between the electrode assembly and the side wall, reduces the expansion space of the electrode assembly, inhibits the expansion of the electrode assembly, reduces the slip amount of the electrode plate, reduces the shear force generated in the slip process, thereby reducing the stress concentration, reducing the risk of electrode plate cracking, and improving the reliability of the cylindrical battery cell.

[0037] As an optional technical solution of the embodiment of the application, the first pole piece comprises a first pole lug, and the second pole piece comprises a second pole lug; the cylindrical battery monomer comprises a first electrode lead-out part and a second electrode lead-out part, the first electrode lead-out part is electrically connected to the first pole lug, and the second electrode lead-out part is electrically connected to the second pole lug; in the axial direction of the cylindrical battery monomer, the first electrode lead-out part and the second electrode lead-out part are located on the same side of the electrode assembly.

[0038] In the above technical solution, when a plurality of cylindrical battery monomers are assembled into a group, the first electrode lead-out part and the second electrode lead-out part of the plurality of cylindrical battery monomers can be arranged on the same side, thereby facilitating the connection of the current conduction component with the first electrode lead-out part and the second electrode lead-out part and simplifying the battery structure.

[0039] As an optional technical solution of the embodiment of the application, the shell comprises a shell body and an end cover, the shell body comprises the side wall and the end wall which are integrally formed, the end wall and the end cover are opposite in the axial direction of the cylindrical battery monomer, and the end cover is sealingly connected to the side wall.

[0040] As an optional technical solution of the embodiment of the application, the first pole piece comprises a first pole lug, and the second pole piece comprises a second pole lug; the cylindrical battery monomer further comprises an electrode terminal which is insulatively arranged on the end wall, the first pole lug is electrically connected to the electrode terminal, and the second pole lug is electrically connected to the end wall.

[0041] In the above technical solution, the electrode terminal and the end wall can serve as two exposed electrodes of the cylindrical battery monomer, and the electrode terminal and the end wall are located on the same side, which is conducive to the assembly of a plurality of cylindrical battery monomers into a group and simplifies the battery structure.

[0042] As an optional technical solution of the embodiment of the application, the cylindrical battery monomer further comprises a first current collection member, the first current collection member is located on the side of the first pole lug facing the end wall and is connected to the first pole lug; the electrode terminal is abutted against and connected to the surface of the first current collection member facing the end wall.

[0043] In the above technical solution, the first current collection member can serve as an adapter to realize the electrical connection of the first pole lug and the electrode terminal.

[0044] As an optional technical solution of the embodiment of the application, the electrode terminal is provided with a terminal recess on the side facing the first current collection member, and / or the electrode terminal is provided with a terminal recess on the side facing away from the first current collection member; the bottom wall of the terminal recess is welded to the first current collection member.

[0045] In the technical solution, the terminal recess is arranged to reduce the thickness of the bottom wall of the terminal recess, reduce the power required for welding the electrode terminal from the outside to the first current collecting member, reduce the risk of particles generated by welding falling into the shell, and improve the reliability of the cylindrical battery cell.

[0046] As an optional technical solution of the embodiment, the first tab and the second tab are both located at one end of the electrode assembly facing the end wall.

[0047] In the technical solution, the first tab and the second tab can share space in the axial direction of the cylindrical battery cell, thereby improving the space utilization and the energy density.

[0048] As an optional technical solution of the embodiment, the first tab is located at one end of the electrode assembly facing the end wall, and the second tab is located at one end of the electrode assembly facing the end cover; the cylindrical battery cell further comprises a second current collecting member connected to the second tab; and the second current collecting member is connected to at least one of the end cover and the side wall.

[0049] As an optional technical solution of the embodiment, the height of the shell is 1.3 to 4 times the outer diameter of the shell.

[0050] In the technical solution, when the shell meets the size requirements, the structural stability of the shell is high, and the use reliability of the cylindrical battery cell can be improved.

[0051] As an optional technical solution of the embodiment, the height of the shell is 50 to 150 mm; and / or the outer diameter of the shell is 40 to 80 mm.

[0052] In the technical solution, when the height of the shell is 50 to 150 mm and / or the outer diameter of the shell is 40 to 80 mm, the cylindrical battery cell is larger, and the electrode assembly is more likely to be over-expanded, and the embodiment has better effect on such cylindrical battery cell.

[0053] In a second aspect, the embodiment also provides a battery comprising the cylindrical battery cell.

[0054] In a third aspect, the embodiment also provides an electrical equipment comprising the cylindrical battery cell, and the cylindrical battery cell is used to provide electrical energy for the electrical equipment. BRIEF DESCRIPTION OF DRAWINGS

[0055] 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 of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

[0056] Fig. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0057] Fig. 2 is an exploded view of a battery according to some embodiments of the present application;

[0058] Fig. 3 is a structural schematic diagram of a cylindrical battery cell according to some embodiments of the present application;

[0059] Fig. 4 is an exploded view of a cylindrical battery cell according to some embodiments of the present application;

[0060] Fig. 5 is a sectional view of a cylindrical battery cell according to some embodiments of the present application;

[0061] Fig. 6 is a simplified schematic diagram of the positional relationship between an elastic insulation member and an electrode assembly according to some embodiments of the present application;

[0062] Fig. 7 is a simplified schematic diagram of the positional relationship between an elastic insulation member and an electrode assembly according to some other embodiments of the present application;

[0063] Fig. 8 is a simplified schematic diagram of the positional relationship between an elastic insulation member and an electrode assembly according to some other embodiments of the present application;

[0064] Fig. 9 is a sectional view of a cylindrical battery cell according to some other embodiments of the present application; and

[0065] Fig. 11 is a sectional view of an elastic insulation member according to some other embodiments of the present application.

[0066] Icon: 10 - box; 11 - first part; 12 - second part; 20 - cylindrical battery cell; 21 - outer shell; 211 - shell body; 2111 - side wall; 2112 - end wall; 212 - end cap; 213 - first electrode lead-out portion; 214 - second electrode lead-out portion; 22 - electrode assembly; 221 - main body portion; 2211 - first tab; 22111 - first end tab; 2212 - separator; 2213 - second tab; 22131 - second end tab; 222 - first tab; 223 - second tab; 23 - elastic insulating member; 231 - leading end; 232 - trailing end; 233 - notch region; 234 - first adhesive layer; 235 - swelling layer; 236 - insulating layer; 237 - second adhesive layer; 24 - electrode terminal; 251 - first current collecting member; 252 - second current collecting member; 26 - lower plastic; 100 - battery; 200 - controller; 300 - motor; 1000 - vehicle. DETAILED DESCRIPTION

[0067] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0068] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments 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.

[0069] 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 phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0070] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; for those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] The term "and / or" in the present application only describes 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 present application generally represents that the front and rear associated objects have an "or" relationship.

[0072] In the embodiments of the present 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 present 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 present application.

[0073] "Multiple" appearing in the present application means two or more (including two).

[0074] In the embodiments of the present application, the cylindrical battery cell can be a secondary battery, which refers to a cylindrical battery cell that can be activated by charging after discharging to continue using the active material.

[0075] The cylindrical battery cell includes but is not limited to lithium ion battery, sodium ion battery, sodium lithium ion battery, lithium metal battery, sodium metal battery, lithium sulfur battery, magnesium ion battery, nickel hydrogen battery, nickel cadmium battery, lead-acid battery, etc.

[0076] The cylindrical 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 cylindrical 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 reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0077] In some embodiments, the positive electrode can be a positive electrode tab, 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.

[0078] 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.

[0079] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as a 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).

[0080] 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. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFeP04 (which can also be referred to simply as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be referred to simply as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to simply as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to simply as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to simply as NCM 622 ), LiNi 0.8 Co0.1Mn 0.1 O2 (which can also be referred to simply as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and a modified compound thereof.

[0081] 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 used as the positive electrode, the foamed metal surface can be free of positive electrode active material, or can be provided with positive electrode active material. As an example, the foamed metal can be filled or / and deposited with lithium source material, potassium metal or sodium metal. The lithium source material can be lithium metal and / or lithium-rich material.

[0082] In some embodiments, the negative electrode can be a negative electrode tab, which can include a negative electrode current collector.

[0083] As an example, the negative electrode current collector can employ a metal foil, foamed metal or composite current collector. For example, as the metal foil, silver surface treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, 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.).

[0084] As an example, the negative electrode tab 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.

[0085] 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.

[0086] As an example, the negative electrode active material can employ a negative electrode active material known in the art for cylindrical battery cells. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0087] 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.

[0088] In some embodiments, the separator is a separator film. The separator film can be any known porous structure separator film having good chemical stability and mechanical stability.

[0089] As an example, the material of the separation film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separation film can be a single layer film or a multi-layer composite film. When the separation film is a multi-layer composite film, the materials of the layers can be the same or different. The separation member can be a separate component located between the positive and negative electrodes or can be attached to the surfaces of the positive and negative electrodes.

[0090] In some embodiments, the separation member is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes and functions to transport ions and separate the positive and negative electrodes.

[0091] In some embodiments, the cylindrical 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.

[0092] 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.

[0093] 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, butyrosulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether-based solvent. The ether-based 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.

[0094] Among them, the gel-state electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0095] Among them, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0096] As an example, the polymer solid-state electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, etc.

[0097] 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.

[0098] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0099] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0100] 0099]As an example, a plurality of separators can be provided between any adjacent positive electrode sheets or negative electrode sheets.

[0101] 00100]As an example, the separators can be continuously provided between any adjacent positive electrode sheets or negative electrode sheets by a winding method.

[0102] 00101]In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0103] 00102]In some embodiments, the electrode assembly can include tabs that can guide current out of the electrode assembly. The tabs can include positive electrode tabs and negative electrode tabs.

[0104] In some embodiments, the cylindrical battery cell can include a housing. The housing can be used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite case), or an aluminum-plastic film.

[0105] The battery referred to in the embodiments of the present application refers to a single physical module including one or more cylindrical battery cells to provide higher voltage and capacity.

[0106] In some embodiments, the battery can be a battery module, and when there are a plurality of cylindrical battery cells, the plurality of cylindrical battery cells are arranged and fixed to form a battery module.

[0107] In some embodiments, the battery can be a battery pack, and the battery pack can include a case and cylindrical battery cells, and the cylindrical battery cells or the battery module can be accommodated in the case.

[0108] In some embodiments, the case can be part of a chassis structure of a vehicle. For example, part of the case can be at least part of a floor of the vehicle, or part of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0109] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0110] 00109]At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0111] 00110]The development of battery technology needs to consider many design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters, in addition, the reliability of the battery also needs to be considered. However, the cylindrical battery cell using the wound electrode assembly has poor reliability.

[0112] For the cylindrical battery cell using the wound electrode assembly, there is a large gap between the electrode assembly and the shell. During the cycle process of the cylindrical battery cell, the electrode assembly is prone to over-expansion, the slip amount of the inner layer of the electrode plate relative to the outer layer of the electrode plate is large, the shear force generated on the outer layer of the electrode plate is large, which is easy to cause stress concentration of the outer layer of the electrode plate, causing the outer layer of the electrode plate to break. When the electrode plate breaks, burrs will be generated at the broken part, and even metal debris will be generated. These burrs and debris may pierce the separator, causing the positive and negative electrode plates to be overlapped, causing the cylindrical battery cell to short circuit, causing the cylindrical battery cell to catch fire, and even explode, resulting in poor reliability of the cylindrical battery cell.

[0113] In view of this, the embodiment of the present application provides a cylindrical battery cell. The cylindrical battery cell includes a shell, an electrode assembly and an elastic insulating piece. The electrode assembly is accommodated in the shell. The electrode assembly includes a first electrode plate, a second electrode plate and a separator. The polarities of the first electrode plate and the second electrode plate are opposite. The first electrode plate, the separator and the second electrode plate are wound. The shell includes a side wall arranged around the electrode assembly. The elastic insulating piece is arranged between the electrode assembly and the side wall, and the elastic insulating piece abuts with the outer surface of the electrode assembly and the inner surface of the side wall, respectively.

[0114] The cylindrical battery cell is provided with an elastic insulating piece between the electrode assembly and the side wall of the shell, the elastic insulating piece abuts against the outer surface of the electrode assembly and the inner surface of the side wall respectively, fills the gap between the electrode assembly and the side wall, reduces the expansion space of the electrode assembly, to a certain extent, inhibits the expansion of the electrode assembly, reduces the risk of excessive expansion of the electrode assembly, reduces the amount of slip of the pole piece, reduces the shear force generated in the process of slip, thereby reducing stress concentration, reducing the risk of pole piece cracking, and improving the reliability of the cylindrical battery cell. In addition, the elastic insulating piece has a certain elasticity and can allow the electrode assembly to expand to a certain extent, so that the pressure on the electrode assembly is not too large, thereby reducing the risk of electrolyte being squeezed out of the electrode assembly, and being beneficial to maintaining the performance of the electrode assembly.

[0115] 00114]The technical solutions described in the embodiments of the present application are suitable for batteries and electric devices using batteries.

[0116] 00115]The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric car toy, an electric ship toy, and an electric plane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above electric devices.

[0117] 00116]The following embodiments take the vehicle as an example for convenience of description.

[0118] 00117]Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and driving.

[0119] In some embodiments of the present application, the battery 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0120] 00119]Referring to FIG. 2, FIG. 2 is an exploded view of the battery 100 according to some embodiments of the present application. The battery 100 includes a box body 10 and a plurality of cylindrical battery cells 20, which are accommodated in the box body 10. The box body 10 is configured to provide a space for accommodating the cylindrical battery cells 20, and can have various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, which are coupled to each other to define a space for accommodating the cylindrical battery cells 20. The second part 12 can be a hollow structure with one open end, and the first part 11 can be a plate structure, which is coupled to the open end of the second part 12 to define the space for accommodating the cylindrical battery cells 20 together with the second part 12. Alternatively, the first part 11 and the second part 12 can both be hollow structures with one open end, and the open end of the first part 11 is coupled to the open end of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder or a cuboid.

[0121] In the battery 100, the plurality of cylindrical battery cells 20 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the plurality of cylindrical battery cells 20 are connected in series and in parallel. The plurality of cylindrical battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and then accommodated in the box body 10. Alternatively, the plurality of cylindrical battery cells 20 can be first connected in series, in parallel, or in a mixed manner to form a battery module, and then a plurality of battery modules are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the box body 10. The battery 100 can further include other structures, for example, the battery 100 can further include a busbar component for electrically connecting the plurality of cylindrical battery cells 20.

[0122] Each of the plurality of cylindrical battery cells 20 can be a secondary cylindrical battery cell or a primary cylindrical battery cell, and can be a lithium-sulfur cylindrical battery cell, a sodium-ion cylindrical battery cell, or a magnesium-ion cylindrical battery cell, but is not limited thereto.

[0123] Please refer to FIG. 3, FIG. 4 and FIG. 5, FIG. 3 is a structural schematic diagram of a cylindrical battery cell 20 provided by some embodiments of the present application. FIG. 4 is an exploded view of the cylindrical battery cell 20 provided by some embodiments of the present application. FIG. 5 is a sectional view of the cylindrical battery cell 20 provided by some embodiments of the present application. Embodiments of the present application provide a cylindrical battery cell 20, which includes a shell 21, an electrode assembly 22 and an elastic insulation piece 23, the electrode assembly 22 is contained in the shell 21. The electrode assembly 22 includes a first electrode tab 2211, a second electrode tab 2213 and a separator 2212, the first electrode tab 2211 and the second electrode tab 2213 are opposite in polarity, and the first electrode tab 2211, the separator 2212 and the second electrode tab 2213 are wound and arranged. The shell 21 includes a side wall 2111 arranged around the electrode assembly 22. The elastic insulation piece 23 is arranged between the electrode assembly 22 and the side wall 2111, and the elastic insulation piece 23 abuts the outer surface of the electrode assembly 22 and the inner surface of the side wall 2111, respectively.

[0124] 00123]The cylindrical battery cell 20 refers to the smallest unit that constitutes the battery 100.

[0125] 00124]The shell 21 includes an end cover 212 and a shell body 211, the shell body 211 has an open-ended containing space for containing the electrode assembly 22. The end cover 212 is connected to the shell body 211 and closes the opening.

[0126] The end cover 212 refers to a component that covers the opening of the shell body 211 to isolate the internal environment of the cylindrical battery cell 20 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the shell body 211 to fit the shell body 211. Optionally, the end cover 212 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 212 is not easy to deform when subjected to extrusion and collision, so that the cylindrical battery cell 20 can have higher structural strength, and the safety performance can also be improved. The material of the end cover 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not specially limited in embodiments of the present application. The cylindrical battery cell 20 also includes an insulation piece arranged on the inner side of the end cover 212, which can be used to isolate the electrical connection components in the shell body 211 from the end cover 212 to reduce the risk of short circuit. Exemplarily, the insulation piece can be plastic, rubber, etc. Optionally, the end cover 212 can also be provided with an electrode terminal 24, which is used to electrically connect with the tab of the electrode assembly 22 to input or output the electrical energy of the cylindrical battery cell 20. The electrode terminal 24 can be directly connected with the tab, such as directly welded with the tab. The electrode terminal 24 can also be indirectly connected with the tab, such as indirectly connected with the tab through a current collecting member.

[0127] The shell 211 is a component for cooperating with the end cover 212 to form an internal environment of the cylindrical battery cell 20, and the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte, and other components. The shell 211 and the end cover 212 can be independent components, and an opening can be provided on the shell 211, and the end cover 212 is used to cover the opening to form the internal environment of the cylindrical battery cell 20. Without limitation, the end cover 212 and the shell 211 can also be integrated, specifically, the end cover 212 and the shell 211 can form a common joint surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 211, the end cover 212 is used to cover the shell 211. The material of the shell 211 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. The cylindrical battery cell 20 further includes a lower plastic 26, which is arranged on the inner side of the end cover 212, and the lower plastic 26 can be used to isolate the electrical connection components in the shell 211 from the end cover 212 to reduce the risk of short circuit. Exemplarily, the lower plastic 26 can be plastic, rubber, etc.

[0128] The electrode assembly 22 is a component in which electrochemical reactions occur in the cylindrical battery cell 20. One or more electrode assemblies 22 can be contained in the shell 21. The electrode assembly 22 is mainly formed by winding the positive electrode sheet and the negative electrode sheet, and an insulating member 2212 is usually arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting a main body portion 221 of the electrode assembly 22, and a portion without active material of the positive electrode sheet and the negative electrode sheet respectively constitutes a tab. The positive tab and the negative tab can be located at one end of the main body portion 221 or at two ends of the main body portion 221 respectively. In the charging and discharging process of the battery 100, the positive active material and the negative active material react with the electrolyte.

[0129] One of the first electrode sheet 2211 and the second electrode sheet 2213 is a positive electrode sheet, and the other is a negative electrode sheet. For example, when the first electrode sheet 2211 is a positive electrode sheet, the second electrode sheet 2213 is a negative electrode sheet. For another example, when the first electrode sheet 2211 is a positive electrode sheet, the second electrode sheet 2213 is a negative electrode sheet.

[0130] 00129]The insulating member 2212 is an insulating structure arranged between the first electrode sheet 2211 and the second electrode sheet 2213, and the insulating member 2212 is used to insulate and separate the first electrode sheet 2211 and the second electrode sheet 2213 to reduce the risk of short circuit caused by the contact between the first electrode sheet 2211 and the second electrode sheet 2213.

[0131] 00130]The first electrode sheet 2211, the insulating member 2212, and the second electrode sheet 2213 are wound to form the electrode assembly 22, that is, the electrode assembly 22 is a wound electrode assembly.

[0132] 00131]The shell 21 comprises a side wall 2111 which is arranged around the electrode assembly 22 along the winding axis of the electrode assembly 22. The side wall 2111 is in a cylindrical structure.

[0133] The elastic insulation member 23 is arranged between the electrode assembly 22 and the side wall 2111. The elastic insulation member 23 abuts against the outer surface of the electrode assembly 22 and the inner surface of the side wall 2111 respectively. Since the isolation member 2212 is located at the outermost layer of the electrode assembly 22, the elastic insulation member 23 actually abuts against the isolation member 2212 and the side wall 2111.

[0134] 00133]The elastic insulation member 23 has an insulation effect and can insulate and separate the electrode assembly 22 and the shell 21. In addition, the elastic insulation member 23 also has a certain elasticity, so that the electrode assembly 22 can expand to a certain extent, so that the pressure on the electrode assembly 22 is not too large, thereby reducing the risk of the electrolyte in the electrode assembly 22 being squeezed out, and being beneficial to maintaining the performance of the electrode assembly 22. The elastic insulation member 23 can be rubber, plastic or the like.

[0135] 00134]The elastic insulation member 23 can be a component capable of absorbing the expansion of the electrolyte. Before the elastic insulation member 23 absorbs the electrolyte, the volume of the elastic insulation member 23 is small, so that the elastic insulation member 23 is conveniently arranged between the electrode assembly 22 and the side wall 2111. The elastic insulation member 23 absorbs the electrolyte and expands to fill the gap between the electrode assembly 22 and the side wall 2111, reduce the expansion space of the electrode assembly 22, and inhibit the expansion of the electrode assembly 22. Of course, the elastic insulation member 23 can also be directly arranged between the electrode assembly 22 and the side wall 2111 and abut against the outer surface of the electrode assembly 22 and the inner surface of the side wall 2111, without the need to absorb the electrolyte and expand.

[0136] 00135]The cylindrical battery monomer 20 is provided with the elastic insulation member 23 between the electrode assembly 22 and the side wall 2111 of the shell 21. The elastic insulation member 23 abuts against the outer surface of the electrode assembly 22 and the inner surface of the side wall 2111 respectively, fills the gap between the electrode assembly 22 and the side wall 2111, reduces the expansion space of the electrode assembly 22, inhibits the expansion of the electrode assembly 22 to a certain extent, reduces the risk of excessive expansion of the electrode assembly 22, reduces the amount of slip of the pole piece, reduces the shear force generated in the process of slipping, thereby reducing stress concentration, reducing the risk of cracking of the pole piece, and improving the reliability of the cylindrical battery monomer 20. In addition, the elastic insulation member 23 has a certain elasticity, which can allow the electrode assembly 22 to expand to a certain extent, so that the pressure on the electrode assembly 22 is not too large, thereby reducing the risk of the electrolyte in the electrode assembly 22 being squeezed out, and being beneficial to maintaining the performance of the electrode assembly 22.

[0137] Please refer to FIG. 3, FIG. 4, FIG. 5 and FIG. 6, which are a simplified schematic diagram of the position relationship between the elastic insulation piece 23 and the electrode assembly 22 provided by some embodiments of the present application. In some embodiments, the cylindrical battery monomer 20 comprises a plurality of elastic insulation pieces 23, and the plurality of elastic insulation pieces 23 are arranged at intervals along the axial direction of the cylindrical battery monomer 20.

[0138] The cylindrical battery monomer 20 can comprise two elastic insulation pieces 23, three elastic insulation pieces 23, four elastic insulation pieces 23, or more than four elastic insulation pieces 23. The plurality of elastic insulation pieces 23 are arranged along the axial direction of the cylindrical battery monomer 20, and there is an interval between two adjacent elastic insulation pieces 23. Each elastic insulation piece 23 is arranged around the outside of the electrode assembly 22. Along the circumferential direction of the cylindrical battery monomer 20, the elastic insulation piece 23 can be entirely wrapped around the outside of the electrode assembly 22, or can be partially wrapped around the outside of the electrode assembly 22.

[0139] The axial direction of the cylindrical battery monomer 20 refers to the extension direction of the axis of the cylindrical battery monomer 20. The circumferential direction of the cylindrical battery monomer 20 refers to the circumferential direction of the cylindrical battery monomer 20. Please refer to FIG. 5 and FIG. 6, the axial direction of the cylindrical battery monomer 20 is the X direction shown in the figure, the circumferential direction of the cylindrical battery monomer 20 is the Y direction shown in the figure, and the axial direction of the cylindrical battery monomer 20 is perpendicular to the circumferential direction of the cylindrical battery monomer 20.

[0140] By arranging a plurality of elastic insulation pieces 23 and arranging the plurality of elastic insulation pieces 23 at intervals along the axial direction of the cylindrical battery monomer 20, the plurality of elastic insulation pieces 23 can suppress the expansion of the electrode assembly 22 at multiple positions in the axial direction of the cylindrical battery monomer 20, which has a good suppression effect, can reduce the risk of electrode sheet cracking, and can improve the reliability of the cylindrical battery monomer 20. In addition, along the axial direction of the cylindrical battery monomer 20, there is a certain interval between two adjacent elastic insulation pieces 23, which can reduce the material consumption of the elastic insulation piece 23 and reduce the cost of the cylindrical battery monomer 20.

[0141] Please refer to FIG. 3, FIG. 4, FIG. 5 and FIG. 6, in some embodiments, the cylindrical battery monomer 20 comprises two elastic insulation pieces 23, and along the axial direction of the cylindrical battery monomer 20, the spacer 2212 comprises two end regions, and the two elastic insulation pieces 23 are arranged around the two end regions, respectively.

[0142] 00141]Along the axial direction of the cylindrical battery monomer 20, the spacer 2212 comprises two end faces arranged opposite to each other. The end region refers to the region in the spacer 2212, which is within the range of 1 / 6 of the length of the spacer 2212, and is away from the end face of the spacer 2212 along the axial direction of the cylindrical battery monomer 20.

[0143]

[00142] The cylindrical battery cell 20 includes two elastic insulating members 23, which are disposed in a one-to-one correspondence with the end regions. Each elastic insulating member 23 surrounds an end region. It should be noted that the dimension of the elastic insulating member 23 along the axial direction of the cylindrical battery cell 20 may extend beyond the end region or may not extend beyond the end region.

[0144]

[00143] By setting two elastic insulating members 23 along the axial direction of the cylindrical battery cell 20, the two elastic insulating members 23 are respectively arranged around the two end regions of the separator 2212, which can not only have a good suppression effect, reduce the risk of electrode cracking and improve the reliability of the cylindrical battery cell 20, but also reduce the material consumption of the elastic insulating members 23 and reduce the cost of the cylindrical battery cell 20.

[0145] Referring to Figures 3, 4, 5, and 6, in some embodiments, along the axial direction of the cylindrical battery cell 20, the length of the elastic insulating member 23 is L1, and the length of the separator 2212 is L2, satisfying: 0.1≤L1 / L2≤0.3.

[0146] L1 represents the length of the elastic insulating member 23 along the axial direction of the cylindrical battery cell 20. During measurement, the length of the elastic insulating member 23 at different positions can be measured and the average value can be taken as L1.

[0147] L2 represents the length of the separator 2212 along the axial direction of the cylindrical battery cell 20. During measurement, the length of the separator 2212 at different positions can be measured and the average value can be taken as L2.

[0148] L1 / L2 represents the ratio of the length of the elastic insulating member 23 along the axial direction of the cylindrical battery cell 20 to the length of the separator 2212 along the axial direction of the cylindrical battery cell 20.

[0149] When there are multiple elastic insulating elements 23, the ratio of the length of the elastic insulating element 23 along the axial direction of the cylindrical battery cell 20 to the length of the separator 2212 along the axial direction of the cylindrical battery cell 20 can be: L1 / L2 = 0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, etc.

[0150] 00149]When L1 / L2≥0.1, the length of the elastic insulation piece 23 along the axial direction of the cylindrical battery cell 20 is large, which can effectively suppress the expansion of the electrode assembly 22, reduce the amount of slip of the electrode tab, reduce the shear force generated in the process of slip, thereby reducing stress concentration, reducing the risk of electrode tab cracking, and improving the reliability of the cylindrical battery cell 20. When L1 / L2≤0.3, the length of the elastic insulation piece 23 along the axial direction of the cylindrical battery cell 20 is not too large, which is conducive to reducing the cost of the cylindrical battery cell 20. Therefore, when 0.1≤L1 / L2≤0.3, the reliability of the cylindrical battery cell 20 and the cost of the cylindrical battery cell 20 can be considered.

[0151] 00150]Optionally, 0.15≤L1 / L2≤0.25.

[0152] The ratio of the length of the elastic insulation piece 23 along the axial direction of the cylindrical battery cell 20 to the length of the separator 2212 along the axial direction of the cylindrical battery cell 20 can be: L1 / L2=0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, etc.

[0153] When L1 / L2≥0.15, the length of the elastic insulation piece 23 along the axial direction of the cylindrical battery cell 20 is larger, which can more effectively suppress the expansion of the electrode assembly 22, further reduce the amount of slip of the electrode tab, reduce the shear force generated in the process of slip, thereby further reducing stress concentration, further reducing the risk of electrode tab cracking, and improving the reliability of the cylindrical battery cell 20. When L1 / L2≤0.25, the length of the elastic insulation piece 23 along the axial direction of the cylindrical battery cell 20 is not too large, which is conducive to reducing the cost of the cylindrical battery cell 20. Therefore, when 0.15≤L1 / L2≤0.25, the reliability of the cylindrical battery cell 20 and the cost of the cylindrical battery cell 20 can be considered.

[0154] Please refer to FIG. 7, which is a simplified schematic diagram of the position relationship between the elastic insulation piece 23 and the electrode assembly 22 provided by some embodiments of the present application. In some embodiments, the elastic insulation piece 23 is one, and along the axial direction of the cylindrical battery cell 20, the length of the elastic insulation piece 23 is L1, and the length of the separator 2212 is L2, which satisfies: 0.5≤L1 / L2≤1.2.

[0155] When the elastic insulation piece 23 is one, the ratio of the length of the elastic insulation piece 23 along the axial direction of the cylindrical battery cell 20 to the length of the separator 2212 along the axial direction of the cylindrical battery cell 20 can be: L1 / L2≤0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, etc.

[0156] When the elastic insulation piece 23 is one and L1 / L2≥0.5, the length of the elastic insulation piece 23 along the axial direction of the cylindrical battery monomer 20 is large, which can effectively inhibit the expansion of the electrode assembly 22, reduce the amount of slip of the pole piece, and reduce the shear force generated in the process of slip, thereby reducing stress concentration, reducing the risk of pole piece cracking, and improving the reliability of the cylindrical battery monomer 20. When the elastic insulation piece 23 is one and L1 / L2≤1.2, the length of the elastic insulation piece 23 along the axial direction of the cylindrical battery monomer 20 is not too large, which is conducive to reducing the cost of the cylindrical battery monomer 20. Therefore, when the elastic insulation piece 23 is one and 0.5≤L1 / L2≤1.2, the reliability of the cylindrical battery monomer 20 and the cost of the cylindrical battery monomer 20 can be considered.

[0157] Please refer to FIG. 8, which is a simplified schematic diagram of the position relationship between the elastic insulation piece 23 and the electrode assembly 22 provided by some embodiments of the present application. In some embodiments, along the axial direction of the cylindrical battery monomer 20, the two ends of the elastic insulation piece 23 are flush with the two ends of the separator 2212, respectively.

[0158] The elastic insulation piece 23 is one, and the two end faces of the elastic insulation piece 23 along the axial direction of the cylindrical battery monomer 20 are flush with the two end faces of the separator 2212 along the axial direction of the cylindrical battery monomer 20, respectively. At this time, L1=L2.

[0159] When the two ends of the elastic insulation piece 23 along the axial direction of the cylindrical battery monomer 20 are flush with the two ends of the separator 2212, respectively, the length of the elastic insulation piece 23 is equal to the length of the separator 2212, that is, L1=L2. At this time, the elastic insulation piece 23 is completely wrapped in the separator 2212 along the axial direction of the cylindrical battery monomer 20, which can more effectively inhibit the expansion of the electrode assembly 22, further reduce the amount of slip of the pole piece, reduce the shear force generated in the process of slip, thereby further reducing stress concentration, further reducing the risk of pole piece cracking, and improving the reliability of the cylindrical battery monomer 20.

[0160] Please refer to FIG. 5 again. In some embodiments, along the circumferential direction of the cylindrical battery monomer 20, the elastic insulation piece 23 is arranged around the electrode assembly 22, and the elastic insulation piece 23 has a leading end 231 and a trailing end 232, which are arranged at intervals. A gap region 233 is formed between the leading end 231 and the trailing end 232, which does not cover the electrode assembly 22.

[0161] 00160]Along the circumferential direction of the cylindrical battery monomer 20, the elastic insulation piece 23 partially wraps the outside of the electrode assembly 22.

[0162] The elastic insulation member 23 has a first end 231 and a second end 232 arranged at intervals along the circumference of the cylindrical battery cell 20, and a gap region 233 is formed between the first end 231 and the second end 232 to expose the electrode assembly 22.

[0163] 00162]By arranging the elastic insulation member 23 around the electrode assembly 22 along the circumference of the cylindrical battery cell 20, the gap between the electrode assembly 22 and the side wall 2111 can be better filled, the expansion space of the electrode assembly 22 can be reduced, the expansion of the electrode assembly 22 can be inhibited, the amount of slip of the pole piece can be reduced, the shear force generated during the slip can be reduced, thereby reducing stress concentration and reducing the risk of pole piece cracking, and the reliability of the cylindrical battery cell 20 is improved. In addition, by forming the gap region 233 between the first end 231 and the second end 232 that does not cover the electrode assembly 22, on the one hand, the material consumption of the elastic insulation member 23 can be reduced, and the cost of the cylindrical battery cell 20 can be reduced. On the other hand, due to the existence of the gap region 233, the first end 231 and the second end 232 are not easy to overlap together to form an overlapping region (the overlapping region has a relatively thick thickness, and the overlapping region can cause stress concentration of the electrode assembly 22), and the electrode assembly 22 is not easy to cause stress concentration, which is beneficial to improve the reliability of the cylindrical battery cell 20.

[0164] Please refer to FIG. 5, in some embodiments, the first pole piece 2211 has a first end 22111, and a part of the second pole piece 2213 exceeds the first end 22111 in the winding direction of the electrode assembly 22, and the second pole piece 2213 includes a pole piece located at the outermost circle of the electrode assembly 22. The second pole piece 2213 has a second end 22131, and the second end 22131 is located in the gap region 233.

[0165] 00164]The first end 22111 is the winding tail end 232 of the first pole piece 2211, and along the winding direction, the first end 22111 is located at the end of the first pole piece 2211, and the first end 22111 is usually close to the outer layer of the electrode assembly 22. The first pole piece 2211 also has a first starting end, which is the beginning of winding the first pole piece 2211, and is usually located inside the electrode assembly 22.

[0166] 00165]The second end 22131 is the winding tail end 232 of the second pole piece 2213, and along the winding direction, the second end 22131 is located at the end of the second pole piece 2213, and the second end 22131 is usually close to the outer layer of the electrode assembly 22. The second pole piece 2213 also has a second starting end, which is the beginning of winding the second pole piece 2213, and is usually located inside the electrode assembly 22. In the embodiment shown in FIG. 5, the first end 22111 is closer to the inside of the electrode assembly 22 than the second end 22131.

[0167] 00166]The "second tab 2213 includes a tab located at the outermost circle of the electrode assembly 22" means that a part of the second tab 2213 is a tab located at the outermost circle of the electrode assembly 22. The first tab 2211 can be a positive tab, and the second tab 2213 can be a negative tab. The second end tab 22131 is located beyond the first end tab 22111 in the winding direction, so that the second tab 2213 covers the first tab 2211, reducing the risk of lithium precipitation.

[0168] 00167]The second end tab 22131 is located in the notch area 233, that is, the position of the notch area 233 corresponds to the position of the second end tab 22131.

[0169] 00168]The electrode assembly 22 has a larger diameter at the position corresponding to the second end tab 22131. By corresponding the position of the notch area 233 to the position of the second end tab 22131, the elastic insulating member 23 does not need to cover the position of the second end tab 22131, thereby reducing the material consumption of the elastic insulating member 23 to a greater extent and reducing the cost of the cylindrical battery cell 20.

[0170] Please refer to FIG. 5. In some embodiments, along the circumference of the cylindrical battery cell 20, the length of the notch area 233 is L3, and the total length of the elastic insulating member 23 and the notch area 233 is L4, which satisfies: L3 / L4≤0.5.

[0171] 00170]L3 represents the length of the notch area 233 along the circumference of the cylindrical battery cell 20, that is, the distance between the first end 231 and the second end 232 along the circumference of the cylindrical battery cell 20.

[0172] 00171]L4 represents the sum of the length of the elastic insulating member 23 along the circumference of the cylindrical battery cell 20 and the length of the notch area 233 along the circumference of the cylindrical battery cell 20. Please refer to FIG. 5. The length of the elastic insulating member 23 along the circumference of the cylindrical battery cell 20 is L5, so L4=L3+L5.

[0173] L3 / L4 represents the ratio of the length of the notch area 233 along the circumference of the cylindrical battery cell 20 to the sum of the length of the elastic insulating member 23 along the circumference of the cylindrical battery cell 20 and the length of the notch area 233 along the circumference of the cylindrical battery cell 20.

[0174] The ratio of the length of the notch area 233 along the circumference of the cylindrical battery cell 20 to the sum of the length of the elastic insulating member 23 along the circumference of the cylindrical battery cell 20 and the length of the notch area 233 along the circumference of the cylindrical battery cell 20 can be: L3 / L4=0.5, 0.45, 0.4, 0.35, 0.3, 0.25, 0.2, 0.15, 0.1, 0.5, etc.

[0175] When L3 / L4≤0.5, the length of the notch region 233 along the circumference of the cylindrical battery monomer 20 is relatively short, and the elastic insulation piece 23 can be arranged on the outer side of the electrode assembly 22 along the circumference of the cylindrical battery monomer 20 to a large extent, preferably fill the gap between the electrode assembly 22 and the side wall 2111, reduce the expansion space of the electrode assembly 22, better inhibit the expansion of the electrode assembly 22, reduce the amount of slip of the pole piece, reduce the shear force generated in the slip process, thereby reducing stress concentration, reducing the risk of pole piece cracking, and improving the reliability of the cylindrical battery monomer 20.

[0176] Optionally, 0.1≤L3 / L4≤0.4.

[0177] The ratio of the length of the notch region 233 along the circumference of the cylindrical battery monomer 20 to the sum of the length of the elastic insulation piece 23 along the circumference of the cylindrical battery monomer 20 and the length of the notch region 233 along the circumference of the cylindrical battery monomer 20 can be: L3 / L4=0.1, 0.12, 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.35, 0.38, 0.4, etc.

[0178] When L3 / L4≤0.4, the length of the notch region 233 along the circumference of the cylindrical battery monomer 20 is shorter, and the elastic insulation piece 23 can be arranged on the outer side of the electrode assembly 22 along the circumference of the cylindrical battery monomer 20 to a larger extent, preferably fill the gap between the electrode assembly 22 and the side wall 2111, reduce the expansion space of the electrode assembly 22, better inhibit the expansion of the electrode assembly 22, reduce the amount of slip of the pole piece, reduce the shear force generated in the slip process, reduce the risk of pole piece cracking, and improve the reliability of the cylindrical battery monomer 20. When L3 / L4≥0.1, the length of the notch region 233 is not too short, which can reduce the material consumption of the elastic insulation piece 23, reduce the cost of the cylindrical battery monomer 20, and also reduce the risk of the first end 231 and the tail end 232 overlapping to form an overlapping region. Therefore, when 0.1≤L3 / L4≤0.4, the reliability and cost of the cylindrical battery monomer 20 can be considered.

[0179] In some embodiments, 1mm≤L3≤5mm.

[0180] 00179]The length of the notch region 233 along the circumference of the cylindrical battery monomer 20 can be: L3=1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc.

[0181] When L3 is less than or equal to 5 mm, the length of the notch area 233 along the circumference of the cylindrical battery monomer 20 is short, and the elastic insulation piece 23 can be wrapped around the outside of the electrode assembly 22 along the circumference of the cylindrical battery monomer 20 to a large extent, preferably filling the gap between the electrode assembly 22 and the side wall 2111, reducing the expansion space of the electrode assembly 22, preferably inhibiting the expansion of the electrode assembly 22, reducing the amount of slip of the pole piece, reducing the shear force generated during the slip process, reducing the risk of pole piece cracking, and improving the reliability of the cylindrical battery monomer 20. When L3 is greater than or equal to 1 mm, the length of the notch area 233 is not too short, which can reduce the material consumption of the elastic insulation piece 23, reduce the cost of the cylindrical battery monomer 20, and also reduce the risk of the first end 231 and the tail end 232 overlapping to form an overlapping area. Therefore, when 1 mm≤L3≤5 mm, the reliability and cost of the cylindrical battery monomer 20 can be considered.

[0182] Please refer to FIG. 5, in some embodiments, the first end 22111 is located in the notch area 233.

[0183] 00182]The first end 22111 is located in the notch area 233, that is, the position of the notch area 233 corresponds to the position of the first end 22111.

[0184] The diameter of the electrode assembly 22 at the position corresponding to the first end 22111 is large, and by corresponding the position of the notch area 233 to the position of the first end 22111, the elastic insulation piece 23 does not need to cover the position where the first end 22111 is located, thereby the material consumption of the elastic insulation piece 23 can be reduced to a large extent, and the cost of the cylindrical battery monomer 20 can be reduced.

[0185] Please refer to FIG. 9, in some embodiments, along the circumference of the cylindrical battery monomer 20, the elastic insulation piece 23 is wrapped around the electrode assembly 22.

[0186] “Along the circumference of the cylindrical battery monomer 20, the elastic insulation piece 23 is wrapped around the electrode assembly 22” means that the elastic insulation piece 23 is completely wrapped around the electrode assembly 22 along the circumference of the cylindrical battery monomer 20.

[0187] By wrapping the elastic insulation piece 23 around the electrode assembly 22 along the circumference of the cylindrical battery monomer 20, the expansion of the electrode assembly 22 can be more effectively inhibited, the amount of slip of the pole piece can be further reduced, the shear force generated during the slip process can be reduced, thereby the stress concentration can be further reduced, the risk of pole piece cracking can be further reduced, and the reliability of the cylindrical battery monomer 20 can be improved.

[0188] Please refer to FIG. 9, in some embodiments, the elastic insulation piece 23 is an annular structure arranged around the electrode assembly 22.

[0189] In the embodiment shown in FIG. 9, the elastic insulation member 23 is in a ring structure (cylindrical structure). The elastic insulation member 23 is arranged around the outside of the electrode assembly 22.

[0190] 00189]The elastic insulation member 23 is in a ring structure, which can effectively suppress the expansion of the electrode assembly 22, reduce the risk of cracking of the electrode tab, and improve the reliability of the cylindrical battery cell 20. On the other hand, when the elastic insulation member 23 is arranged around the outside of the electrode assembly 22, there is no overlapping area, which is not easy to cause stress concentration of the electrode assembly 22, and is conducive to improving the reliability of the cylindrical battery cell 20. Please refer to FIG. 10, which is a cross-sectional view of the elastic insulation member 23 provided in some embodiments of the present application. In the embodiment in which the elastic insulation member 23 is a component capable of absorbing electrolyte and expanding, the elastic insulation member 23 can include an expansion layer 235 and a first adhesive layer 234, and the expansion layer 235 and the first adhesive layer 234 are arranged in a stacked manner. The expansion layer 235 is configured to be capable of absorbing electrolyte and expanding, and the first adhesive layer 234 is adhered to the inner surface of the side wall 2111.

[0191] 00190]The first adhesive layer 234 has adhesion, and the first adhesive layer 234 is adhered to the inner surface of the side wall 2111 to achieve the connection of the elastic insulation member 23 and the side wall 2111. In some embodiments, the first adhesive layer 234 is arranged on the side of the expansion layer 235 facing the side wall 2111, and the first adhesive layer 234 connects the expansion layer 235 and the side wall 2111.

[0192] The expansion layer 235 is capable of absorbing electrolyte and expanding to fill the gap between the electrode assembly 22 and the side wall 2111, reduce the expansion space of the electrode assembly 22, and suppress the expansion of the electrode assembly 22. The expansion layer 235 and the first adhesive layer 234 are arranged along the thickness direction of the elastic insulation member 23.

[0193] 00192]The first adhesive layer 234 has adhesion, and by arranging the first adhesive layer 234, the elastic insulation member 23 can be adhered to the inner surface of the shell 21, and the connection of the elastic insulation member 23 and the shell 21 is more firm, reducing the risk of the elastic insulation member 23 leaving the space between the electrode assembly 22 and the side wall 2111. The expansion layer 235 is capable of absorbing electrolyte and expanding along its thickness direction, thereby filling the gap between the electrode assembly 22 and the side wall 2111, reducing the expansion space of the electrode assembly 22, suppressing the expansion of the electrode assembly 22, reducing the amount of sliding of the electrode tab, reducing the shear force generated in the sliding process, thereby reducing stress concentration, reducing the risk of cracking of the electrode tab, and improving the reliability of the electrode assembly 22.

[0194] Please refer to FIG. 10. In some embodiments, the expansion layer 235 is made of an insulating material.

[0195] 00194]The expansion layer 235 can absorb the electrolyte and expand, and has insulation properties, and can insulate and separate the electrode assembly 22 from the side wall 2111. For example, the expansion layer 235 can be made of oriented polystyrene.

[0196] 00195]The expansion layer 235 is made of an insulating material, so that the expansion layer 235 can not only absorb the electrolyte and expand, but also has insulation properties. In this way, the expansion layer 235 can insulate and separate the side wall 2111 from the electrode assembly 22, and reduce the risk of short circuit caused by contact between the side wall 2111 and the electrode assembly 22.

[0197] 00196]Referring to FIG. 11, FIG. 11 is a cross-sectional view of the elastic insulation piece 23 according to some embodiments of the present application. In some embodiments, the elastic insulation piece 23 further includes an insulation layer 236, and the expansion layer 235 and the insulation layer 236 are arranged in layers.

[0198] The insulation layer 236 has insulation properties, and can insulate and separate the side wall 2111 from the electrode assembly 22. The insulation layer 236 can be made of plastic, rubber, or the like.

[0199] 00198]The insulation layer 236 and the expansion layer 235 are arranged along the thickness direction of the elastic insulation piece 23. The insulation layer 236 can be closer to the side wall 2111 than the expansion layer 235, or the expansion layer 235 can be closer to the side wall 2111 than the insulation layer 236. Referring to FIG. 10, in the embodiment shown in FIG. 10, the insulation layer 236 is closer to the side wall 2111 than the expansion layer 235.

[0200] 00199]Optionally, the elastic insulation piece 23 further includes a second adhesive layer 237, and the second adhesive layer 237 bonds the insulation layer 236 and the expansion layer 235, so that the insulation layer 236 and the expansion layer 235 are more closely connected.

[0201] 00200]The elastic insulation piece 23 further includes the insulation layer 236, so that the elastic insulation piece 23 has insulation properties, and can insulate and separate the side wall 2111 from the electrode assembly 22, and reduce the risk of short circuit caused by contact between the side wall 2111 and the electrode assembly 22.

[0202] In some embodiments, the material of the elastic insulation piece 23 includes oriented polystyrene.

[0203] The oriented polystyrene can swell greatly when absorbing electrolyte. Before the elastic insulation member 23 absorbs electrolyte, the volume of the elastic insulation member 23 is small, so that the elastic insulation member 23 is easily arranged between the electrode assembly 22 and the side wall 2111. Then, the elastic insulation member 23 swells by absorbing electrolyte in the cylindrical battery cell 20, fills the gap between the electrode assembly 22 and the side wall 2111, reduces the swelling space of the electrode assembly 22, suppresses the swelling of the electrode assembly 22, reduces the amount of slip of the electrode tab, reduces the shear force generated in the process of slip, thereby reducing stress concentration, reducing the risk of cracking of the electrode tab, and improving the reliability of the cylindrical battery cell 20.

[0204] Please refer to FIG. 3 and FIG. 4 again. In some embodiments, the first electrode tab 2211 includes a first tab 222, and the second electrode tab 2213 includes a second tab 223. The cylindrical battery cell 20 includes a first electrode lead 213 and a second electrode lead 214. The first electrode lead 213 is electrically connected to the first tab 222, and the second electrode lead 214 is electrically connected to the second tab 223. In the axial direction of the cylindrical battery cell 20, the first electrode lead 213 and the second electrode lead 214 are located on the same side of the electrode assembly 22.

[0205] 00204]The first tab 222 is a positive tab or a negative tab as described above, and the second tab 223 is a negative tab or a positive tab as described above. The polarity of the first tab 222 and the second tab 223 is opposite. When the first tab 222 is a positive tab, the second tab 223 is a negative tab. When the first tab 222 is a negative tab, the second tab 223 is a positive tab.

[0206] The first electrode lead 213 and the second electrode lead 214 are used to connect with an external circuit to realize charging or discharging of the cylindrical battery cell 20. For example, when a plurality of cylindrical battery cells 20 are assembled into a group, the first electrode lead 213 and the second electrode lead 214 are used to connect with a busbar component.

[0207] 00206]The first electrode lead 213 can be an electrode terminal 24 arranged on the shell 21. The electrode terminal 24 is independently formed with the shell 21 and assembled together in the production process of the cylindrical battery cell 20. For example, the electrode terminal 24 is arranged on the end cover 212 or the shell 211 in an insulating manner.

[0208] Alternatively, the first electrode lead 213 can also be a part of the shell 21. For example, the first electrode lead 213 can be the end cover 212 of the shell 21, or the first electrode lead 213 can be the end wall 2112 of the shell 211 opposite to the end cover 212.

[0209] The second electrode lead-out portion 214 can be an electrode terminal 24 provided on the shell 21. Alternatively, the second electrode lead-out portion 214 can be a part of the shell 21. For example, the second electrode lead-out portion 214 can be an end cover 212 of the shell 21, or the second electrode lead-out portion 214 can be an end wall 2112 of the shell 211 opposite to the end cover 212.

[0210] The first electrode lead-out portion 213 is electrically connected to the first tab 222, and the second electrode lead-out portion 214 is electrically connected to the second tab 223. The first electrode lead-out portion 213 and the second electrode lead-out portion 214 are insulated from each other.

[0211] 00210]In some embodiments, in the axial direction of the cylindrical battery cell 20, the first electrode lead-out portion 213 and the second electrode lead-out portion 214 are located on the same side of the electrode assembly 22.

[0212] 00211]When a plurality of cylindrical battery cells 20 are assembled into a group, the first electrode lead-out portions 213 and the second electrode lead-out portions 214 of the plurality of cylindrical battery cells 20 can be arranged on the same side, facilitating the connection of the current collecting member to the first electrode lead-out portions 213 and the second electrode lead-out portions 214 and simplifying the structure of the battery 100.

[0213] Please refer to FIGS. 3 and 4. In some embodiments, the shell 21 includes a shell body 211 and an end cover 212, the shell body 211 includes an integrally formed side wall 2111 and an end wall 2112, the end wall 2112 and the end cover 212 are opposite in the axial direction of the cylindrical battery cell 20, and the end cover 212 is sealingly connected to the side wall 2111.

[0214] The end cover 212 can be insulated from the side wall 2111 or can be electrically connected.

[0215] 00214]The end wall 2112 of the shell body 211 away from the end wall 2112 has an opening, and the end cover 212 covers the opening of the shell body 211.

[0216] Please refer to FIGS. 3 and 4. In some embodiments, the first tab 222 is included in the first electrode tab 2211, and the second tab 223 is included in the second electrode tab 2213. The cylindrical battery cell 20 further includes an electrode terminal 24 insulated from the end wall 2112, the first tab 222 is electrically connected to the electrode terminal 24, and the second tab 223 is electrically connected to the end wall 2112.

[0217] 00216]As an example, the first tab 222 is electrically connected to the electrode terminal 24, and the second tab 223 is electrically connected to the end wall 2112. The second tab 223 can be directly connected to the end wall 2112 or indirectly connected to the end wall 2112 through the end cover 212, the side wall 2111, or other components.

[0218] One of the electrode terminal 24 and the end wall 2112 serves as a first electrode lead-out portion 213, and the other serves as a second electrode lead-out portion 214.

[0219] The electrode terminal 24 and the end wall 2112 can serve as two exposed electrodes of the cylindrical battery cell 20, and the electrode terminal 24 and the end wall 2112 are located on the same side, which facilitates the assembly of a plurality of cylindrical battery cells 20 into a group and simplifies the structure of the battery 100.

[0220] Please refer to FIG. 3 and FIG. 4. In some embodiments, the cylindrical battery cell 20 further includes a first current collecting member 251, which is located on the side of the first tab 222 facing the end wall 2112 and connected to the first tab 222. The electrode terminal 24 is abutted against and connected to the surface of the first current collecting member 251 facing the end wall 2112.

[0221] The first current collecting member 251 can serve as an adapter to realize the electrical connection between the first tab 222 and the electrode terminal 24.

[0222] Please refer to FIG. 3 and FIG. 4. In some embodiments, the side of the electrode terminal 24 facing the first current collecting member 251 is provided with a terminal recess, and / or the side of the electrode terminal 24 away from the first current collecting member 251 is provided with a terminal recess; the bottom wall of the terminal recess is welded to the first current collecting member 251.

[0223] By providing the terminal recess, the thickness of the bottom wall of the terminal recess can be reduced, the power required for welding the electrode terminal 24 and the first current collecting member 251 from the outside can be reduced, the risk of particles generated by welding falling into the housing 21 can be reduced, and the reliability of the cylindrical battery cell 20 can be improved.

[0224] Providing the terminal recess on the inner side of the electrode terminal 24 can also increase the internal space of the cylindrical battery cell 20.

[0225] In some embodiments, the side of the electrode terminal 24 away from the first current collecting member 251 is provided with a terminal recess.

[0226] In some embodiments, the side of the electrode terminal 24 facing the first current collecting member 251 is provided with one terminal recess, and the side of the electrode terminal 24 away from the first current collecting member 251 is provided with another terminal recess; the corresponding parts of the bottom surfaces of the two terminal recesses are welded to the first current collecting member 251.

[0227] In some embodiments, the bottom wall of the terminal recess is provided with a through hole, which can be used for injecting electrolyte.

[0228] In some embodiments, the cylindrical battery cell 20 further includes a cover plate, which is connected to the electrode terminal 24 and used to separate the through hole from the external space of the cylindrical battery cell 20.

[0229] In some embodiments, at least part of the cover plate is housed in the terminal recess. In some embodiments, the first electrode lead-out portion 213 includes the cover plate and the electrode terminal 24.

[0230] In some embodiments, the electrode terminal 24 is riveted to the end wall 2112.

[0231] Referring to FIGS. 3 and 4, in some embodiments, the first tab 222 and the second tab 223 are both located at an end of the electrode assembly 22 facing the end wall 2112.

[0232] The first tab 222 and the second tab 223 can share space in the axial direction of the cylindrical battery cell 20, thereby improving space utilization and increasing energy density.

[0233] Referring to FIGS. 3 and 4, in some embodiments, the first tab 222 is located at an end of the electrode assembly 22 facing the end wall 2112, and the second tab 223 is located at an end of the electrode assembly 22 facing the end cover 212. The cylindrical battery cell 20 further includes a second current collector member 252 connected to the second tab 223, the second current collector member 252 being connected to at least one of the end cover 212 and the side wall 2111.

[0234] In some examples, the second current collector member 252 is connected to the end cover 212, and the end cover 212 is electrically connected to the side wall 2111. The second tab 223 is electrically connected to the end wall 2112 through the second current collector member 252, the end cover 212, and the side wall 2111.

[0235] In other examples, the second current collector member 252 is connected to the side wall 2111. The second tab 223 is electrically connected to the end wall 2112 through the second current collector member 252 and the side wall 2111. Optionally, the end cover 212 is provided in an insulating manner with the side wall 2111.

[0236] In some embodiments, the height of the housing 21 is 1.3 to 4 times the outer diameter of the housing 21.

[0237] Exemplarily, the height of the housing 21 can be a dimension of the housing 21 in the axial direction of the cylindrical battery cell 20.

[0238] Optionally, the height of the housing 21 is 1.3 times, 1.4 times, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, 2.0 times, 2.1 times, 2.2 times, 2.3 times, 2.4 times, 2.5 times, 2.6 times, 2.7 times, 2.8 times, 2.9 times, 3.0 times, 3.1 times, 3.2 times, 3.3 times, 3.4 times, 3.5 times, 3.6 times, 3.7 times, 3.8 times, 3.9 times, or 4.0 times the outer diameter of the housing 21.

[0239] When the shell 21 meets the above size requirements, the structural stability of the shell 21 is relatively high, and the use reliability of the cylindrical battery monomer 20 can be improved.

[0240] In some embodiments, the height of the shell 21 is 1.5 to 2.5 times the outer diameter of the shell 21.

[0241] In some embodiments, the height of the shell 21 is 50 to 150 mm; and / or the outer diameter of the shell 21 is 40 to 80 mm.

[0242] In some embodiments, the height of the shell 21 is 50 to 150 mm. For example, the height of the shell 21 is 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, 100 mm, 105 mm, 110 mm, 115 mm, 120 mm, 125 mm, 130 mm, 135 mm, 140 mm, 145 mm, or 150 mm.

[0243] Optionally, the height of the shell 21 is 60 to 100 mm.

[0244] In some embodiments, the outer diameter of the shell 21 is 40 to 80 mm. For example, the diameter of the shell 21 is 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, or 80 mm.

[0245] When the height of the shell 21 is 50 to 150 mm and / or the outer diameter of the shell 21 is 40 to 80 mm, the cylindrical battery monomer 20 is relatively large, and the electrode assembly 22 is more likely to be over-swollen. The effect of the embodiments of the present application is better for such cylindrical battery monomers 20.

[0246] In some embodiments, the cylindrical battery monomer 20 includes two electrode terminals 24 arranged on the end wall 2112, and the first tab 222 and the second tab 223 are respectively electrically connected to the two electrode terminals 24. The two electrode terminals 24 are respectively the first electrode lead-out portion 213 and the second electrode lead-out portion 214.

[0247] 00246]Optionally, the cylindrical battery monomer 20 includes a first current collecting member 251 and a second current collecting member 252, the first current collecting member 251 connects the first tab 222 and one of the electrode terminals 24, and the second current collecting member 252 connects the second tab 223 and the other electrode terminal 24.

[0248] In other embodiments, the cylindrical battery monomer 20 includes one electrode terminal 24 arranged on the end wall 2112, the first tab 222 is electrically connected to the electrode terminal 24, and the second tab 223 is electrically connected to the end wall 2112.

[0249] In some embodiments, the first tab 222 has a projection along the axial direction of the cylindrical battery cell 20 in the shape of a sector.

[0250] In some embodiments, the second tab 223 has a projection along the axial direction of the cylindrical battery cell 20 in the shape of a sector.

[0251] 00250]The embodiments of the present application also provide a battery 100, which includes the cylindrical battery cell 20 described above.

[0252] The embodiments of the present application also provide an electrical device, which includes the cylindrical battery cell 20 described above, and the cylindrical battery cell 20 is configured to provide electric energy for the electrical device.

[0253] According to some embodiments of the present application, refer to FIG. 3-9.

[0254] 00253]The embodiments of the present application provide a cylindrical battery cell 20, which includes a housing 21, an electrode assembly 22 and an elastic insulation piece 23, and the electrode assembly 22 is contained in the housing 21. The electrode assembly 22 includes a first electrode tab 2211, a second electrode tab 2213 and a separator 2212, the polarities of the first electrode tab 2211 and the second electrode tab 2213 are opposite, and the first electrode tab 2211, the separator 2212 and the second electrode tab 2213 are wound together. The housing 21 includes a side wall 2111 arranged around the electrode assembly 22. The elastic insulation piece 23 is arranged between the electrode assembly 22 and the side wall 2111, and the elastic insulation piece 23 abuts against the outer surface of the electrode assembly 22 and the inner surface of the side wall 2111, respectively. The cylindrical battery cell 20 is provided with the elastic insulation piece 23 between the electrode assembly 22 and the side wall 2111 of the housing 21, and the elastic insulation piece 23 abuts against the outer surface of the electrode assembly 22 and the inner surface of the side wall 2111, respectively, to fill the gap between the electrode assembly 22 and the side wall 2111, reduce the swelling space of the electrode assembly 22, inhibit the swelling of the electrode assembly 22 to a certain extent, reduce the risk of excessive swelling of the electrode assembly 22, reduce the amount of sliding of the electrode tab, reduce the shear force generated in the sliding process, thereby reducing stress concentration, reducing the risk of cracking of the electrode tab, and improving the reliability of the cylindrical battery cell 20. In addition, the elastic insulation piece 23 has a certain elasticity, which can allow the electrode assembly 22 to swell to a certain extent, so that the pressure on the electrode assembly 22 is not too large, thereby reducing the risk of extrusion of the electrolyte in the electrode assembly 22, and being beneficial to maintaining the performance of the electrode assembly 22.

[0255] The cylindrical battery cell 20 includes two elastic insulation pieces 23, which are arranged along the axial direction of the cylindrical battery cell 20. The two elastic insulation pieces 23 are arranged around two end regions of the separator 2212, respectively. By arranging the two elastic insulation pieces 23 along the axial direction of the cylindrical battery cell 20 and around the two end regions of the separator 2212, respectively, the two elastic insulation pieces 23 can have a better inhibiting effect, can reduce the risk of tab cracking, and can improve the reliability of the cylindrical battery cell 20. In addition, the two elastic insulation pieces 23 can reduce the material consumption of the elastic insulation pieces 23 and reduce the cost of the cylindrical battery cell 20.

[0256] The elastic insulation piece 23 is arranged around the electrode assembly 22 along the circumferential direction of the cylindrical battery cell 20. The elastic insulation piece 23 has a first end 231 and a second end 232, which are arranged apart from each other. A gap region 233, in which the electrode assembly 22 is not covered, is formed between the first end 231 and the second end 232. By arranging the elastic insulation piece 23 around the electrode assembly 22 along the circumferential direction of the cylindrical battery cell 20, the elastic insulation piece 23 can better fill the gap between the electrode assembly 22 and the side wall 2111, reduce the expansion space of the electrode assembly 22, inhibit the expansion of the electrode assembly 22, reduce the amount of tab sliding, reduce the shear force generated during the sliding process, thereby reducing stress concentration and reducing the risk of tab cracking, and improving the reliability of the cylindrical battery cell 20. In addition, by forming the gap region 233, in which the electrode assembly 22 is not covered, between the first end 231 and the second end 232, on the one hand, the material consumption of the elastic insulation piece 23 can be reduced, and the cost of the cylindrical battery cell 20 can be reduced. On the other hand, due to the existence of the gap region 233, the first end 231 and the second end 232 are not easy to overlap together to form an overlapping region (the overlapping region has a relatively thick thickness, and the overlapping region can cause stress concentration of the electrode assembly 22), and the electrode assembly 22 is not easy to cause stress concentration, which is conducive to improving the reliability of the cylindrical battery cell 20.

[0257] 00256]The first tab 2211 has a first end 22111. A part of the second tab 2213 extends beyond the first end 22111 in the winding direction of the electrode assembly 22. The second tab 2213 includes a tab located at the outermost circle of the electrode assembly 22. The second tab 2213 has a second end 22131, which is located in the gap region 233. The second end 22131 is located in the gap region 233, that is, the position of the gap region 233 corresponds to the position of the second end 22131. The diameter of the electrode assembly 22 at the position corresponding to the second end 22131 is relatively large. By corresponding the position of the gap region 233 to the position of the second end 22131, the elastic insulation piece 23 does not need to cover the position of the second end 22131, thereby greatly reducing the material consumption of the elastic insulation piece 23 and reducing the cost of the cylindrical battery cell 20.

[0258] The first end 22111 is located in the notch area 233. The first end 22111 is located in the notch area 233, that is, the position of the notch area 233 corresponds to the position of the first end 22111. The electrode assembly 22 has a larger diameter at the position corresponding to the first end 22111. By corresponding the position of the notch area 233 to the position of the first end 22111, the elastic insulation member 23 does not need to cover the position of the first end 22111, thereby reducing the material consumption of the elastic insulation member 23 to a greater extent and reducing the cost of the cylindrical battery cell 20.

[0259] In some embodiments, the material of the elastic insulation member 23 includes oriented polystyrene. Oriented polystyrene can swell greatly when absorbing electrolyte. Before the elastic insulation member 23 absorbs electrolyte, the volume of the elastic insulation member 23 is small, thereby facilitating the arrangement of the elastic insulation member 23 between the electrode assembly 22 and the side wall 2111. Then, the elastic insulation member 23 swells by absorbing electrolyte in the cylindrical battery cell 20, fills the gap between the electrode assembly 22 and the side wall 2111, reduces the swelling space of the electrode assembly 22, suppresses the swelling of the electrode assembly 22, reduces the amount of slip of the electrode tab, reduces the shear force generated in the slip process, thereby reducing stress concentration, reducing the risk of cracking of the electrode tab, and improving the reliability of the cylindrical battery cell 20.

[0260] In some embodiments, the first electrode tab 2211 includes a first tab 222, and the second electrode tab 2213 includes a second tab 223. The cylindrical battery cell 20 includes a first electrode lead 213 and a second electrode lead 214. The first electrode lead 213 is electrically connected to the first tab 222, and the second electrode lead 214 is electrically connected to the second tab 223. In the axial direction of the cylindrical battery cell 20, the first electrode lead 213 and the second electrode lead 214 are located on the same side of the electrode assembly 22. When a plurality of cylindrical battery cells 20 are assembled into a group, the first electrode leads 213 and the second electrode leads 214 of the plurality of cylindrical battery cells 20 can be arranged on the same side, facilitating the connection of the current collecting member to the first electrode leads 213 and the second electrode leads 214 and simplifying the structure of the battery 100.

[0261] In some embodiments, the shell 21 comprises a casing 211 and an end cover 212, the casing 211 comprises an integrally formed side wall 2111 and an end wall 2112, the end wall 2112 and the end cover 212 are opposite along the axial direction of the cylindrical battery cell 20, and the end cover 212 is sealingly connected to the side wall 2111. The first pole piece 2211 comprises a first pole lug 222, and the second pole piece 2213 comprises a second pole lug 223. The cylindrical battery cell 20 further comprises an electrode terminal 24 which is insulatedly arranged at the end wall 2112, the first pole lug 222 is electrically connected to the electrode terminal 24, and the second pole lug 223 is electrically connected to the end wall 2112. The electrode terminal 24 and the end wall 2112 can serve as two exposed electrodes of the cylindrical battery cell 20, and the electrode terminal 24 and the end wall 2112 are located at the same side, which is conducive to assembling a plurality of cylindrical battery cells 20 into a group and simplifying the structure of the battery 100.

[0262] 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.

[0263] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A cylindrical battery cell, wherein, The cylindrical battery cell comprises a housing, an electrode assembly accommodated in the housing, and an elastic insulation member arranged between the electrode assembly and the housing. The cylindrical battery cell comprises a plurality of elastic insulation members arranged along an axial direction of the cylindrical battery cell. The cylindrical battery cell comprises two elastic insulation members arranged along an axial direction of the cylindrical battery cell, and the separator comprises two end regions, and the two elastic insulation members are arranged around the two end regions, respectively. The length of the elastic insulation member along the axial direction of the cylindrical battery cell is L1, and the length of the separator along the axial direction of the cylindrical battery cell is L2, and 0.1≤L1 / L2≤0.3 is satisfied.

2. The cylindrical battery cell of claim 1, wherein, 0.15≤L1 / L2≤0.25 is satisfied.

3. The cylindrical battery cell of claim 2, wherein, The length of the elastic insulation member along the axial direction of the cylindrical battery cell is L1, and the length of the separator along the axial direction of the cylindrical battery cell is L2, and 0.5≤L1 / L2≤1.2 is satisfied.

4. The cylindrical battery cell according to claim 2 or 3, wherein, The two ends of the elastic insulation member are flush with the two ends of the separator along the axial direction of the cylindrical battery cell.

5. The cylindrical battery cell of claim 4, wherein, The elastic insulation member is arranged around the electrode assembly along a circumferential direction of the cylindrical battery cell, the elastic insulation member has a leading end and a trailing end, the leading end and the trailing end are arranged at intervals, and a gap region not covering the electrode assembly is formed between the leading end and the trailing end.

6. The cylindrical battery cell of claim 1, wherein, The first tab has a first end, and a portion of the second tab protrudes beyond the first end in the winding direction of the electrode assembly, the second tab comprises a tab located at the outermost circle of the electrode assembly, and the second tab has a second end.

7. The cylindrical battery cell of claim 6, wherein, The length of the gap region along the circumferential direction of the cylindrical battery cell is L3, and the total length of the elastic insulation member and the gap region along the circumferential direction of the cylindrical battery cell is L4, and L3 / L4≤0.5 is satisfied.

8. The cylindrical battery cell of any one of claims 1-7, wherein, 0.1≤L3 / L4≤0.4 is satisfied.

9. The cylindrical battery cell of claim 8, wherein, 1mm≤L3≤5mm is satisfied.

10. The cylindrical battery cell of claim 9, wherein, The first end is located in the gap region.

11. The cylindrical battery cell of claim 10, wherein, The elastic insulation member entirely covers the electrode assembly along the circumferential direction of the cylindrical battery cell.

12. The cylindrical battery cell of claim 10 or 11, wherein, The elastic insulation member is in the form of a ring arranged around the electrode assembly.

13. The cylindrical battery cell of any one of claims 9-12, wherein, The material of the elastic insulation member comprises oriented polystyrene.

14. The cylindrical battery cell of any one of claims 1-7, wherein, The first tab comprises a first tab ear, and the second tab comprises a second tab ear.

15. The cylindrical battery cell of claim 14, wherein, The cylindrical battery cell comprises a first electrode lead and a second electrode lead, the first electrode lead is electrically connected to the first tab ear, and the second electrode lead is electrically connected to the second tab ear.

16. The cylindrical battery cell of any one of claims 1-15, wherein, The first electrode lead and the second electrode lead are located on the same side of the electrode assembly along the axial direction of the cylindrical battery cell.

17. The cylindrical battery cell of any one of claims 1-16, wherein, ​ ​ ​ 18. The cylindrical battery cell of any one of claims 1-17, wherein, The shell comprises a shell body and an end cover, the shell body comprises the integral side wall and end wall, the end wall and the end cover are opposite along the axial direction of the cylindrical battery cell, and the end cover is sealingly connected to the side wall.

19. The cylindrical battery cell of claim 18, wherein, The first tab comprises a first tab lug, and the second tab comprises a second tab lug. The cylindrical battery cell further comprises an electrode terminal insulatedly arranged on the end wall, the first tab lug is electrically connected to the electrode terminal, and the second tab lug is electrically connected to the end wall.

20. The cylindrical battery cell of claim 19, wherein, The cylindrical battery cell further comprises a first current collecting member, the first current collecting member is located on a side of the first tab lug facing the end wall and is connected to the first tab lug. The electrode terminal abuts against and is connected to a surface of the first current collecting member facing the end wall.

21. The cylindrical battery cell of claim 20, wherein, The electrode terminal is provided with a terminal recess on a side facing the first current collecting member, and / or the electrode terminal is provided with a terminal recess on a side facing away from the first current collecting member. A bottom wall of the terminal recess is welded to the first current collecting member.

22. The cylindrical battery cell of any one of claims 19-21, wherein, The first tab lug and the second tab lug are both located on an end of the electrode assembly facing the end wall.

23. The cylindrical battery cell of any one of claims 19-21, wherein, The first tab lug is located on an end of the electrode assembly facing the end wall, and the second tab lug is located on an end of the electrode assembly facing the end cover. The cylindrical battery cell further comprises a second current collecting member connected to the second tab lug, and the second current collecting member is connected to at least one of the end cover and the side wall.

24. The cylindrical battery cell of any one of claims 1-23, wherein, The height of the shell is 1.3 to 4 times the outer diameter of the shell.

25. The cylindrical battery cell of any one of claims 1-24, wherein, The height of the shell is 50 mm to 150 mm; and / or The outer diameter of the shell is 40 mm to 80 mm.

26. A battery, wherein, The cylindrical battery cell according to any one of claims 1-25.

27. An electrical device, comprising: The cylindrical battery cell according to any one of claims 1-25 is used to provide electric energy for the electric device.

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