Cylindrical battery monomer, battery and power utilization device

Abstract

The utility model provides a cylindrical battery monomer, a battery and a power utilization device. The cylindrical battery monomer comprises a shell, an electrode assembly, a first connecting piece and a second connecting piece, the electrode assembly is housed within the housing. The electrode assembly is cylindrical and comprises a main body part, a first tab and a second tab, the first tab and the second tab are located on the same side of the main body part in the winding axial direction, and the polarities of the first tab and the second tab are opposite; the first connecting piece is used for being electrically connected with the first tab; the second connecting piece is used for being electrically connected with the second tab; wherein the first tab comprises a first bending area, the first bending area is used for being connected with the first connecting piece, the second tab comprises a second bending area, the second bending area is used for being connected with the second connecting piece, and the surface, deviating from the main body part, of the first bending area is flush with the surface, deviating from the main body part, of the second bending area. The reliability of the cylindrical battery monomer can be improved.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] In the development of battery technology, how to improve battery reliability has always been a research direction in battery technology. Utility Model Content

[0004] In view of the above problems, the present application provides a cylindrical battery cell, a battery and an electrical device, which can improve the reliability of the cylindrical battery cell.

[0005] In the first aspect, the present application provides a cylindrical battery cell, which includes a housing, an electrode assembly, a first connector, and a second connector. The electrode assembly is contained in the housing, and is cylindrical. The electrode assembly includes a main body, a first pole ear, and a second pole ear. The first pole ear and the second pole ear are located on the same side of the main body along the winding axis, and the first pole ear and the second pole ear have opposite polarities; a first connector is used to electrically connect to the first pole ear; and a second connector is used to electrically connect to the second pole ear; wherein the first pole ear includes a first bending zone, and the first bending zone is used to connect to the first connector, and the second pole ear includes a second bending zone, and the second bending zone is used to connect to the second connector, and the surface of the first bending zone away from the main body and the surface of the second bending zone away from the main body are arranged flush.

[0006] In the above scheme, the first bending zone and the second bending zone are arranged flush with the surface away from the main body to facilitate the electrical connection between the first bending zone and the second bending zone and the adapter connected to the bending zone in the cylindrical battery cell, thereby reducing the risk of reduced connection strength due to size differences during the connection process and improving the reliability of the cylindrical battery cell.

[0007] In some embodiments, along the winding axis, a size of the first electrode tab in a flattened state is smaller than a size of the second electrode tab in a flattened state.

[0008] In the above scheme, by setting pole ears of different sizes, the first pole ear and the second pole ear can have a predetermined density after being flattened, so that the first pole ear and the second pole ear can provide sufficient strength when welded to the electrode terminal, thereby improving the reliability of the connection between the pole ear and the electrode terminal, and further improving the reliability of the cylindrical battery cell.

[0009] In some embodiments, the number of first pole ears includes multiple, the width of the first pole ear near the inner winding circle is smaller than the width of the first pole ear near the outer winding circle, and the width of the first pole ear is the size of the first pole ear along the winding direction; and / or the number of second pole ears includes multiple, the width of the second pole ear near the inner winding circle is smaller than the width of the second pole ear near the outer winding circle, and the width of the second pole ear is the size of the second pole ear along the winding direction.

[0010] In the above scheme, it is beneficial to increase the overall size of the bending area of ​​the pole tab, thereby increasing the connection area between the bending area of ​​the pole tab and the electrode terminal, thereby increasing the current carrying capacity of the pole tab and improving the performance of the cylindrical battery cell.

[0011] In some embodiments, along a direction away from the winding center, the widths of the plurality of first tabs and / or the widths of the plurality of second tabs gradually increase.

[0012] In the above scheme, by increasing the width of the first pole tab and the second pole tab, the connection area between the first pole tab and the second pole tab and the electrode terminal on the cylindrical battery cell is increased after being flattened or smoothed, thereby increasing the current carrying capacity of the pole tab and improving the performance of the cylindrical battery cell.

[0013] In some embodiments, the number of first pole ears includes multiple, the length of the first pole ear close to the inner winding circle is smaller than the length of the first pole ear close to the outer winding circle, and the length of the first pole ear is the dimension of the first pole ear along the axial direction of winding; and / or the number of second pole ears includes multiple, the length of the second pole ear close to the inner winding circle is smaller than the length of the second pole ear close to the outer winding circle, and the length of the second pole ear is the dimension of the second pole ear along the axial direction of winding.

[0014] In the above scheme, it is helpful to increase the density of the bending zone formed by flattening the tab, reduce the possibility of collapse of the bending zone, and improve the connection reliability between the bending zone and the adapter.

[0015] In some embodiments, along a direction away from the winding center, lengths of the first plurality of tabs and / or lengths of the second plurality of tabs gradually increase.

[0016] In the above scheme, by setting the above settings, it is helpful to adjust the density of the electrode tab after flattening, so that the first electrode tab and the second electrode tab can freely adjust their own strength according to design requirements, which is helpful to improve the strength of the electrode tab and the electrode terminal during welding and improve the reliability of the connection between the electrode tab and the electrode terminal.

[0017] In some embodiments, the thickness of the second pole tab is less than that of the first pole tab, which is beneficial to increase the selection range of the second pole tab material and the first pole tab material and reduce the manufacturing cost of the second pole tab and the first pole tab.

[0018] In some embodiments, the number of first pole ears includes multiple, and the thickness of the first pole ear near the inner winding circle is less than the thickness of the first pole ear near the outer winding circle; and / or the number of second pole ears includes multiple, and the thickness of the second pole ear near the inner winding circle is less than the thickness of the second pole ear near the outer winding circle.

[0019] In the above scheme, it is beneficial to improve the supporting strength of the part of the bending zone close to the outer ring area formed after the tab is flattened, reduce the possibility of collapse of the bending zone, and improve the connection strength between the bending zone and the adapter.

[0020] In some embodiments, along a direction away from the winding center, the thicknesses of the plurality of first tabs and / or the plurality of second tabs gradually increase.

[0021] In the above scheme, by setting the above configuration, it is helpful to reduce the impedance of the first pole ear and the second pole ear, increase the current capacity of the first pole ear and the second pole ear, and improve the performance of the cylindrical battery cell. In addition, by increasing in the direction away from the winding center, the difficulty of winding can be reduced, and the risk of being unable to wind due to too small a winding angle during the winding process can be reduced.

[0022] In some embodiments, the first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab.

[0023] In some embodiments, the material of the first pole ear includes aluminum, and the material of the second pole ear includes copper. Since the ductility of the second pole ear material is less than that of the first pole ear material, the selection of the above materials is conducive to achieving the thickness design requirements of the first pole ear and the second pole ear. In addition, the above materials have low cost and mature manufacturing process, which is conducive to reducing manufacturing costs.

[0024] In some embodiments, the density ρ1 of the first bending zone is 0.2 g / cm 3 ≤ρ1≤1g / cm 3 , and / or, the density ρ2 of the second bending zone is 0.5g / cm 3 ≤ρ2≤1.5g / cm 3 .

[0025] In the above scheme, by setting the density range of the first bending zone and the second bending zone, the possibility of burning the isolation piece during welding due to too low density of the first bending zone and the second bending zone is reduced. In addition, the connection strength between the bending zone and the electrode terminal can be improved, and the possibility of insufficient welding strength between the bending zone and the electrode terminal can be reduced.

[0026] In some embodiments, the density ρ1 of the first bending zone and the density ρ2 of the second bending zone satisfy the relationship: ρ2>ρ1.

[0027] In the above scheme, since the first pole ear and the second pole ear are made of different materials, the material of the second pole ear can be copper, so that the energy required for the second pole ear during the welding process is greater than the energy required for the first pole ear during the welding process. The above setting is helpful to reduce the risk of poor welding between the second pole ear and the electrode terminal during the welding process.

[0028] In some embodiments, the housing includes a first terminal and a second terminal, the first terminal is connected to the first bending region, and the second terminal is connected to the second bending region.

[0029] In the above scheme, the above arrangement is helpful to reduce the size of the first bending zone and the second bending zone on the electrode terminal, thereby reducing the overall size of the electrode assembly and improving the energy density of the cylindrical battery cell.

[0030] In some embodiments, a cylindrical battery cell includes an outer shell, an electrode assembly is accommodated in the outer shell, the outer shell includes an end cap and a shell that are insulated from each other, the shell includes at least one side opening, the end cap covers the opening, the first connector is connected to one of the end cap and the shell, and the second connector is connected to the other.

[0031] In the above scheme, through the above arrangement, the connection method between the electrode assembly and the shell is simplified, the difficulty of connecting the first electrode tab and the second electrode tab with other structures in the cylindrical battery cell is reduced, and the reliability of the cylindrical battery cell is improved.

[0032] In some embodiments, the cylindrical battery cell includes a housing and an electrode terminal, the electrode assembly is accommodated in the housing, the first connector is connected to one of the housing and the electrode terminal, and the second connector is connected to the other.

[0033] In the above scheme, the above arrangement is helpful to increase the application scope of the electrode assembly to meet various design requirements and improve the applicability of the cylindrical battery cell.

[0034] In some embodiments, the cylindrical battery cell includes an electrode terminal, the electrode terminal includes a first terminal and a second terminal, the first connector is connected to the first terminal, and the second connector is connected to the second terminal.

[0035] In the above scheme, it is helpful to reduce the size of the first bending zone and the second bending zone in the cylindrical battery cell, thereby reducing the overall size of the electrode assembly and improving the energy density of the cylindrical battery cell.

[0036] In a second aspect, an embodiment of the present application provides a battery, comprising a cylindrical battery cell in any of the aforementioned embodiments.

[0037] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery in any of the aforementioned embodiments, and the battery is used to provide electrical energy.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of the present application;

[0041] Figure 2 is a schematic diagram of an exploded structure of a battery provided in an embodiment of the present application;

[0042] Figure 3 is a structural schematic diagram of a battery module provided in an embodiment of the present application;

[0043] Figure 4 is a schematic cross-sectional structural diagram of a cylindrical battery cell provided in an embodiment of the present application;

[0044] Figure 5 This is a schematic diagram of the structure of a tab in a cylindrical battery cell after being flattened, provided in an embodiment of the present application;

[0045] Figure 6 This is a schematic diagram of the cross-sectional structure of a tab in a cylindrical battery cell after being flattened, provided in an embodiment of the present application;

[0046] Figure 7 yes Figure 6 A schematic diagram of an enlarged structure of R;

[0047] Figure 8 It is a schematic diagram of the structure of a tab in a cylindrical battery cell in a flattened state provided in an embodiment of the present application;

[0048] Fig. 9 It is a schematic diagram of a cross-sectional structure of a tab in a cylindrical battery cell in a flattened state provided in an embodiment of the present application;

[0049] Fig.10 This is a schematic diagram of a top view of a flattened tab in a cylindrical battery cell provided in an embodiment of the present application;

[0050] Fig.11It is a schematic cross-sectional structure diagram of another cylindrical battery cell tab in a flattened state provided in an embodiment of the present application;

[0051] Fig.12 It is a schematic cross-sectional structure diagram of another cylindrical battery cell tab in a flattened state provided in an embodiment of the present application;

[0052] Fig.13 yes Figure 4 Schematic diagram of an amplified structure of Q.

[0053] Marking Description

[0054] 1000. Vehicles;

[0055] 100, battery; 200, controller; 300, motor; 400, housing; 410, first housing portion; 420, second housing portion; 430, storage portion; 500, battery module;

[0056] 110. Cylindrical battery cell; 111. Housing; 112. Electrode assembly;

[0057] 10. Main body; 20. First pole ear; 21. First bending area; 30. Second pole ear; 31. Second bending area; 40. First terminal; 50. Second terminal; 60. First connecting member; 70. Second connecting member;

[0058] X, winding axis. DETAILED DESCRIPTION

[0059] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0062] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0064] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0065] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] In the embodiment of the present application, the cylindrical battery cell may be a secondary battery. A secondary battery refers to a cylindrical battery cell that can be continuously used by activating the active material by charging after the cylindrical battery cell is discharged.

[0068] The cylindrical battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0069] Cylindrical battery cells generally include an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the cylindrical battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0070] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0071] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0072] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with silver surface treatment may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0074] As an example, the negative electrode current collector can be a metal foil, a foamed metal, a foamed carbon or a composite current collector. For example, as a metal foil, a silver surface treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium can be used. The foamed metal can be a foamed nickel, a foamed copper, a foamed aluminum or a foamed alloy. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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 substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0075] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0076] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0077] As an example, the negative electrode active material may be a negative electrode active material for cylindrical battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc.

[0078] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0079] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0080] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0081] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0082] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0083] In some embodiments, the cylindrical battery cell further includes an electrolyte, which plays a role of conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0084] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0085] In some embodiments, the electrode assembly is a laminate structure.

[0086] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0087] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0088] In some embodiments, the cylindrical battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0089] In some embodiments, the housing may be provided with functional components such as electrode terminals, etc. The electrode terminals may be used to electrically connect to the electrode assembly to output or input electrical energy of the cylindrical battery cells.

[0090] In some embodiments, a current collecting member may be disposed in the housing, and the electrode assembly may be electrically connected to the housing or an electrode terminal disposed on the housing through the current collecting member.

[0091] 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.

[0092] In some embodiments, the battery may be a battery module. When there are multiple cylindrical battery cells, the multiple cylindrical battery cells are arranged and fixed to form a battery module.

[0093] In some embodiments, the battery may be a battery pack, which includes a case and cylindrical battery cells, wherein the cylindrical battery cells or battery modules are accommodated in the case.

[0094] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0095] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0096] The development of battery technology must take into account many design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0097] As an important component in the battery, the electrode assembly usually uses a tab to electrically connect to the electrode terminal on the battery to realize the charging and discharging of the cylindrical battery cell. Before connecting the tab to the electrode terminal, the tab needs to be flattened so that the tab has a predetermined density to achieve the strength of welding with the electrode terminal. The positive and negative tabs with different polarities are flattened to form the positive bending area and negative bending area, which need to be electrically connected to the electrode terminal through an adapter. However, due to the different materials of the positive and negative tabs, the positive bending area and negative bending area are prone to poor welding when they are electrically connected to the adapter, which is not conducive to improving the reliability of the cylindrical battery cell.

[0098] Based on the above technical problems, the present application provides a technical solution, which arranges the first bending zone and the second bending zone flush with the surface away from the main body to facilitate the electrical connection between the first bending zone and the second bending zone and the adapter connected to the bending zone in the cylindrical battery cell, thereby reducing the risk of reduced connection strength due to size differences during the connection process and improving the reliability of the cylindrical battery cell.

[0099] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries, such as mobile phones, portable devices, laptop computers, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc., wherein spacecrafts include airplanes, rockets, space shuttles and spacecrafts, etc., electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0100] The cylindrical battery cells described in the embodiments of the present application are not limited to the electrical devices described above, but for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0101] See also Figure 1 , Figure 1 It is a structural schematic diagram of a vehicle provided in an embodiment of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 can be arranged inside the vehicle 1000, for example, a battery 100 can be arranged at the bottom or the front or the rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used, for example, to control the battery to power the motor 300. The battery can be used for starting and navigating the vehicle 1000, and of course, the battery 100 can also be used to drive the vehicle 1000 to drive, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0102] Figure 2 Schematic diagram of the explosion structure of a battery provided in an embodiment of the present application. Figure 2 As shown, the battery 100 includes a housing 400 and cylindrical battery cells (not shown in the figure), and the cylindrical battery cells are accommodated in the housing 400 .

[0103] The box 400 is used to accommodate cylindrical battery cells, and the box 400 can be of various structures. In some embodiments, the box 400 can include a first box portion 410 and a second box portion 420, the first box portion 410 and the second box portion 420 cover each other, and the first box portion 410 and the second box portion 420 jointly define a receiving portion 430 for accommodating cylindrical battery cells. The second box portion 420 can be a hollow structure with one end open, the first box portion 410 is a plate-like structure, and the first box portion 410 covers the open side of the second box portion 420 to form a box with a receiving portion 430; the first box portion 410 and the second box portion 420 can also be hollow structures with one side open, and the open side of the first box portion 410 covers the open side of the second box portion 420 to form a box 400 with a receiving portion 430. Of course, the first box body 410 and the second box body 420 can be in various shapes, such as a cylinder, a cuboid, etc.

[0104] In the battery 100, there can be one or more cylindrical battery cells. If there are multiple cylindrical battery cells, the multiple cylindrical battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple cylindrical battery cells are both connected in series and in parallel. Multiple cylindrical battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple cylindrical battery cells is accommodated in the box 400; of course, multiple cylindrical battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module 500, and the multiple battery modules 500 are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 400.

[0105] Figure 3 It is a structural schematic diagram of a battery module provided in an embodiment of the present application.

[0106] In some embodiments, Figure 3 As shown, there are multiple cylindrical battery cells 110, and the multiple cylindrical battery cells 110 are first connected in series, parallel or mixed to form a battery module 500. The multiple battery modules 500 are then connected in series, parallel or mixed to form a whole, and are accommodated in a box.

[0107] Figure 4 It is a schematic diagram of the cross-sectional structure of a cylindrical battery cell provided in an embodiment of the present application. Figure 5 It is a schematic diagram of the structure of a tab in a cylindrical battery cell after being bent, provided in an embodiment of the present application. Figure 6 It is a schematic diagram of the cross-sectional structure of a tab in a cylindrical battery cell after being bent, provided in an embodiment of the present application. Figure 7 yes Figure 6 Schematic diagram of the enlarged structure of R.

[0108] See also Figures 4 to 7The embodiment of the present application provides a cylindrical battery cell 110, which includes a housing 111, an electrode assembly 112, a first connector 60, and a second connector 70. The electrode assembly 112 includes a main body 10, a first pole tab 20, and a second pole tab 30. The electrode assembly 112 is cylindrical, and the first pole tab 20 and the second pole tab 30 are located on the same side of the main body 10 along the winding axis, and the first pole tab 20 and the second pole tab 30 have opposite polarities; the first connector 60 is used to electrically connect to the first pole tab 20; the second connector 70 is used to electrically connect to the second pole tab 30; wherein the first pole tab 20 includes a first bending zone 21, and the first bending zone 21 is used to connect to the first connector 60, and the second pole tab 30 includes a second bending zone 31, and the second bending zone 31 is used to connect to the second connector 70. The surface of the first bending zone 21 away from the main body 10 and the surface of the second bending zone 31 away from the main body 10 are arranged flush.

[0109] The electrode assembly 112 includes a first pole piece and a second pole piece. During the charge and discharge process of the cylindrical battery cell 110, active ions (such as lithium ions) are inserted and removed back and forth between the first pole piece and the second pole piece. Optionally, the electrode assembly 112 also includes a separator disposed between the first pole piece and the second pole piece, which can reduce the risk of short circuit of the positive second pole piece and allow active ions to pass through.

[0110] Exemplarily, the first pole piece and the second pole piece are both strip-shaped structures, and the first pole piece and the second pole piece can be stacked and wound around a winding center to form the electrode assembly 112. Optionally, the number of the first pole piece can include one or more. Optionally, the number of the second pole piece can include one or more.

[0111] Optionally, one or more first pole lugs 20 may be provided on a first pole piece.

[0112] Optionally, one or more second pole tabs 30 may be provided on a second pole piece.

[0113] For example, the first pole tab 20 and the second pole tab 30 may be symmetrically arranged along the winding axis as a symmetry axis. Alternatively, the first pole tab 20 and the second pole tab 30 may be arranged at intervals in the winding direction, and the interval size may be adjusted according to the design.

[0114] It is understandable that the first electrode tab 20 can form the first bending region 21 through processes such as flattening and smoothing; the second electrode tab can form the second bending region 31 through processes such as flattening and smoothing.

[0115] It is understandable that due to process errors such as the flattening process and the cutting process of the pole ear, the absolute value of the difference between the size of the first bending zone 21 along the winding axis and the size of the second bending zone 31 along the winding axis is less than or equal to 2 mm and is regarded as the surface of the first bending zone 21 away from the main body 10 and the surface of the second bending zone 31 away from the main body 10 being flush.

[0116] Optionally, one of the first pole piece and the second pole piece may be a positive pole tab, and the other may be a negative pole tab.

[0117] Optionally, the first connector 60 and the second connector 70 may be an integral structure, and the first connector 60 and the second connector 70 are separated by an insulating member. Of course, the first connector 60 and the second connector 70 may also be separate structures.

[0118] In the cylindrical battery cell 110 provided in the embodiment of the present application, the first bending zone 21 and the second bending zone 31 are arranged flush with the surface of the main body 10 to facilitate the electrical connection between the first bending zone 21 and the second bending zone 31 and the adapter connected to the bending zone in the cylindrical battery cell, thereby reducing the risk of reduced connection strength due to size differences during the connection process and improving the reliability of the cylindrical battery cell.

[0119] Figure 8 It is a schematic diagram of the structure of a tab in a cylindrical battery cell in a flattened state provided in an embodiment of the present application. Fig. 9 It is a schematic diagram of the cross-sectional structure of a tab in a cylindrical battery cell in a flattened state provided in an embodiment of the present application.

[0120] In some optional embodiments, see Figure 8 and Fig. 9 Along the winding axis, the size of the first pole tab 20 in the flattened state is smaller than the size of the second pole tab 30 in the flattened state.

[0121] The electrode assembly 112 may include a first electrode sheet, a second electrode sheet, and a separator, wherein the separator is located between the first electrode sheet and the second electrode sheet. The first electrode sheet and the second electrode sheet each include an area covering the active material layer and an area not covering the active material layer, wherein the area not covering the active material layer may form a pole ear, and the main body 10 may include an area covering the active material layer and a separator.

[0122] It can be understood that the flattened state of the first pole ear refers to the state in which the first pole ear 20 is bent to form the first bending area 21, and then the bent first bending area 21 is unfolded to form a flat plane through a process. In some examples, the size of the first pole ear 20 along the winding axis X can be the distance from the edge of the isolating member along the winding axis X to the edge of the first pole ear 20 facing away from the isolating member. In other examples, the size of the first pole ear 20 along the winding axis X can also be the distance from the edge of the covering active material layer area along the winding axis X to the edge of the first pole ear 20 facing away from the active material layer area.

[0123] In some examples, the size of the second pole tab 30 along the winding axial direction X may be the distance from the edge of the separator along the winding axial direction X to the edge of the second pole tab 30 facing away from the separator. In other examples, the size of the second pole tab 30 along the winding axial direction X may also be the distance from the edge of the covering active material layer region along the winding axial direction X to the edge of the second pole tab 30 facing away from the active material layer region.

[0124] In the embodiments of the present application, the dimension of the pole tab along the winding axis X is exemplified as the distance from the edge of the isolating element along the winding axis X to the edge of the pole tab facing away from the isolating element.

[0125] In the electrode assembly 112 provided in the embodiment of the present application, by setting pole ears of different sizes, the first pole ear 20 and the second pole ear 30 can have a predetermined density after being flattened, so that the first pole ear 20 and the second pole ear 30 can provide sufficient strength when being welded to the electrode terminal, thereby providing reliability of the connection between the pole ear and the electrode terminal, and further providing reliability of the cylindrical battery cell 110.

[0126] Fig.10 It is a schematic diagram of the top view structure of an electrode assembly after being flattened, provided in an embodiment of the present application.

[0127] In some optional embodiments, see Figure 4 and Fig.10 , the number of first pole tabs 20 includes a plurality of first pole tabs, the width of the first pole tab close to the inner winding circle is less than the width of the first pole tab close to the outer winding circle, and the first pole tab width is the size of the first pole tab 20 along the winding direction. And / or the number of second pole tabs 30 includes a plurality of second pole tabs, the width of the second pole tab close to the inner winding circle is less than the width of the second pole tab close to the outer winding circle, and the second pole tab width is the size of the second pole tab 30 along the winding direction.

[0128] In some examples, the width of the first pole lug near the inner winding circle is less than the width of the first pole lug near the outer winding circle. In other examples, the width of the second pole lug near the inner winding circle is less than the width of the second pole lug near the outer winding circle. In other examples, the width of the first pole lug near the inner winding circle is less than the width of the first pole lug near the outer winding circle. And, the width of the second pole lug near the inner winding circle is less than the width of the second pole lug near the outer winding circle.

[0129] Exemplarily, the width of the first pole lug close to the inner winding circle and the width of the second pole lug close to the inner winding circle may be equal, or may be unequal.

[0130] Exemplarily, the width of the first pole lug close to the outer winding circle and the width of the second pole lug close to the outer winding circle may be equal, or may be unequal.

[0131] Exemplarily, the widths of the multiple first pole tabs near the inner winding circle may be the same preset size; the widths of the multiple first pole tabs near the outer winding circle may be the same preset size.

[0132] In these optional embodiments, it is helpful to increase the overall size of the bending area of ​​the tab, thereby increasing the connection area between the bending area of ​​the tab and the electrode terminal, thereby increasing the current carrying capacity of the tab and improving the performance of the cylindrical battery cell 110.

[0133] In some optional embodiments, see Figure 4 and Fig.10 , along the direction away from the winding center, the widths of the multiple first pole tabs and / or the second pole tabs gradually increase.

[0134] Exemplarily, the electrode assembly 112 includes a first pole sheet and a second pole sheet. The first pole sheet and the second pole sheet are stacked and wound around a winding center to form a wound electrode assembly 112. Taking the first pole sheet as an example, the first pole sheet may include a plurality of first pole ears 20. Before the first pole sheet is wound, the plurality of first pole ears 20 are spaced apart along the length direction of the first pole sheet. Before the first pole sheet is wound to form the electrode assembly 112, the plurality of first pole ears 20 may be overlapped in the thickness direction of the electrode assembly 112. At this time, the plurality of first pole ears 20 are in a flattened state. When the electrode assembly 112 needs to be electrically connected to other structures on the cylindrical battery cell 110, the plurality of first pole ears 20 need to be subjected to processes such as flattening or smoothing so that the plurality of first pole ears 20 form a first bending zone 21. The first bending zone 21 includes a welding plane. Other structures on the cylindrical battery cell 110 may fit the welding plane and be connected to the first bending zone 21. For example, the electrode terminal is fit to the welding plane through an adapter and is welded to the first bending zone 21.

[0135] Further, the first pole tab width may be the dimension of the first pole tab 20 along the length direction of the first pole sheet before the first pole sheet is wound. Moreover, after the first pole sheet is wound to form the electrode assembly 112, a plurality of first pole tabs 20 are sequentially arranged in a direction away from the winding center, and the widths of the plurality of first pole tabs are gradually increased, so that the orthographic projection shapes of the plurality of first pole tabs 20 on the main body 10 together form a fan shape.

[0136] Optionally, the number and width of the second tabs 30 may be the same as those of the first tabs 20 , or the second tab width arrangement may be similar to the first tab width arrangement, for example, the first tab width increase factor and the second tab width increase factor are different.

[0137] Optionally, the width of the first pole tab may be increased by multiples or by a fixed value. Of course, targeted arrangements may also be made according to design requirements.

[0138] In these optional embodiments, by increasing the width of the first pole tab and the second pole tab, the connection area between the first pole tab 20 and the second pole tab 30 and the electrode terminal on the cylindrical battery cell 110 is increased after being flattened or smoothed, thereby increasing the current carrying capacity of the pole tabs and improving the performance of the cylindrical battery cell 110.

[0139] In some other examples, along a direction away from the winding center, the widths of the plurality of first tabs may be the same, and / or, along a direction away from the winding center, the widths of the plurality of second tabs may be the same.

[0140] Fig.11 It is a schematic diagram of the cross-sectional structure of another type of tab in a cylindrical battery cell in a flattened state provided in an embodiment of the present application.

[0141] In some optional embodiments, see Figure 4 and Fig.11 , the number of first pole lugs 20 includes a plurality of first pole lugs 20, the length of the first pole lug 20 near the inner winding circle is less than the length of the first pole lug near the outer winding circle, and the first pole lug length is the dimension of the first pole lug 20 along the winding axial direction. And / or the number of second pole lugs 30 includes a plurality of second pole lugs 30, the length of the second pole lug near the inner winding circle is less than the length of the second pole lug near the outer winding circle, and the second pole lug length is the dimension of the second pole lug 30 along the winding axial direction.

[0142] In some examples, the length of the first pole lug near the inner winding circle is less than the length of the first pole lug near the outer winding circle. In other examples, the length of the second pole lug near the inner winding circle is less than the length of the second pole lug near the outer winding circle. In still other examples, the length of the first pole lug near the inner winding circle is less than the length of the first pole lug near the outer winding circle. And, the length of the second pole lug near the inner winding circle is less than the length of the second pole lug near the outer winding circle.

[0143] Exemplarily, the length of the first pole lug close to the inner winding circle and the length of the second pole lug close to the inner winding circle may be equal, or may be unequal.

[0144] Exemplarily, the length of the first pole lug close to the outer winding circle and the length of the second pole lug close to the outer winding circle may be equal, or may be unequal.

[0145] Exemplarily, the lengths of the multiple first pole tabs near the inner winding circle may be the same preset size; the lengths of the multiple first pole tabs near the outer winding circle may be the same preset size.

[0146] In these optional embodiments, it is helpful to increase the density of the bending zone formed by flattening the tab, reduce the possibility of collapse of the bending zone, and improve the connection reliability between the bending zone and the adapter.

[0147] In some optional embodiments, see Figure 4 and Fig.11 , along the direction away from the winding center, the lengths of the multiple first pole ears and / or the lengths of the multiple second pole ears gradually increase.

[0148] In some examples, at least a portion of the lengths of the plurality of first tabs gradually increase in a direction away from the winding center. In other examples, at least a portion of the lengths of the plurality of second tabs gradually increase in a direction away from the winding center. In other examples, at least a portion of the lengths of the plurality of first tabs gradually increase in a direction away from the winding center. And, at least a portion of the lengths of the plurality of second tabs gradually increase in a direction away from the winding center.

[0149] In some examples, along the direction away from the winding center, the lengths of the plurality of first pole ears may increase by multiples or by a fixed value. Of course, they may also be arranged in a targeted manner according to design requirements.

[0150] In some examples, the second tab length arrangement may be similar to the first tab length arrangement, for example, the first tab length increase factor and the second tab length increase factor are different.

[0151] It should be noted that the minimum length of the second pole lug is greater than the maximum length of the first pole lug.

[0152] In some examples, the lengths of the plurality of first pole tabs are arranged in a gradually increasing manner in a direction away from the winding center. In other examples, some of the plurality of first pole tab lengths are the same, and the lengths of the other first pole tabs gradually increase in a direction away from the winding center.

[0153] In these optional embodiments, by setting the above-mentioned settings, it is helpful to adjust the density of the tab after flattening, so that the first tab 20 and the second tab 30 can freely adjust their own strength according to design requirements, which is helpful to improve the strength of the tab and the electrode terminal during welding and improve the reliability of the connection between the tab and the electrode terminal.

[0154] Fig.12 It is a schematic diagram of the cross-sectional structure of another type of tab in a cylindrical battery cell in a flattened state provided in an embodiment of the present application.

[0155] In some optional embodiments, see Figure 4 and Fig.12 The thickness of the second pole tab is less than that of the first pole tab, which is beneficial to increasing the selection range of the second pole tab 30 material and the first pole tab 20 material and reducing the manufacturing cost of the second pole tab 30 and the first pole tab 20.

[0156] In some optional embodiments, see Figure 4 and Fig.12 , the number of first pole ears includes multiple, the thickness of the first pole ear close to the inner winding circle is less than the thickness of the first pole ear close to the outer winding circle; and / or the number of second pole ears includes multiple, the thickness of the second pole ear close to the inner winding circle is less than the thickness of the second pole ear close to the outer winding circle.

[0157] In some examples, the thickness of the first pole lug near the inner winding circle is less than the thickness of the first pole lug near the outer winding circle. In other examples, the thickness of the second pole lug near the inner winding circle is less than the thickness of the second pole lug near the outer winding circle. In other examples, the thickness of the first pole lug near the inner winding circle is less than the thickness of the first pole lug near the outer winding circle. The thickness of the second pole lug near the inner winding circle is less than the thickness of the second pole lug near the outer winding circle.

[0158] Exemplarily, the thickness of the first pole lug close to the inner winding circle and the thickness of the second pole lug close to the inner winding circle may be equal, or may be unequal.

[0159] Exemplarily, the thickness of the first pole lug close to the outer winding circle and the thickness of the second pole lug close to the outer winding circle may be equal, or may be unequal.

[0160] Exemplarily, the thicknesses of the multiple first pole tabs near the inner winding circle may be the same preset size; the thicknesses of the multiple first pole tabs near the outer winding circle may be the same preset size.

[0161] In these optional embodiments, it is helpful to improve the support strength of the portion of the bending zone close to the outer ring area formed after the tab is flattened, reduce the possibility of collapse of the bending zone, and improve the connection strength between the bending zone and the adapter.

[0162] In some optional embodiments, see Figure 4 and Fig.12 , along the direction away from the winding center, the thickness of the multiple first pole tabs and / or the thickness of the multiple second pole tabs gradually increases.

[0163] In some examples, at least some of the thicknesses of the plurality of first pole tabs gradually increase. In other examples, at least some of the thicknesses of the plurality of second pole tabs gradually increase. In other examples, at least some of the thicknesses of the plurality of first pole tabs gradually increase. And, at least some of the thicknesses of the plurality of second pole tabs gradually increase.

[0164] In some examples, along the direction away from the winding center, the thickness of the plurality of first pole tabs may increase by multiples or by a fixed value. Of course, they may also be arranged in a targeted manner according to design requirements.

[0165] In some examples, the arrangement scheme of the second tab thickness may be similar to the arrangement scheme of the first tab thickness, for example, the increase multiple of the first tab thickness is different from the increase multiple of the second tab thickness.

[0166] It should be noted that the maximum value of the thickness of the second electrode tab is smaller than the minimum value of the thickness of the first electrode tab.

[0167] In some examples, the thicknesses of the plurality of first pole tabs are arranged in a gradually increasing manner in a direction away from the winding center. In other examples, some of the plurality of first pole tab thicknesses are the same, and the thicknesses of the other portion of the first pole tabs gradually increase in a direction away from the winding center.

[0168] In these optional embodiments, by setting the above configuration, it is helpful to reduce the impedance of the first pole tab 20 and the second pole tab 30, increase the current capacity of the first pole tab 20 and the second pole tab 30, and improve the performance of the cylindrical battery cell 110. In addition, by increasing in the direction away from the winding center, the difficulty of winding can be reduced, and the risk of being unable to wind due to too small a winding angle during the winding process can be reduced.

[0169] In some optional embodiments, the first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab.

[0170] In some optional embodiments, the material of the first pole lug 20 includes aluminum, and the material of the second pole lug 30 includes copper. Since the ductility of the material of the second pole lug 30 is less than that of the material of the first pole lug 20, the selection of the above materials is conducive to achieving the thickness design requirements of the first pole lug 20 and the second pole lug 30. In addition, the above materials have low costs and mature manufacturing processes, which is conducive to reducing manufacturing costs.

[0171] In some optional embodiments, see Figure 6 , Fig. 9as well as Fig.10 The density ρ1 of the first bending zone 21 is 0.2 g / cm 3 ≤ρ1≤1g / cm 3 , and / or, the density ρ2 of the second bending zone 31 is 0.5 g / cm 3 ≤ρ2≤1.5g / cm 3 .

[0172] For example, the density ρ1 of the first bending zone 21 is 0.2 g / cm 3 , 0.3g / cm 3 , 0.4g / cm 3 , 0.5g / cm 3 , 0.6g / cm 3 , 0.7g / cm 3 , 0.8g / cm 3 , 0.9g / cm 3 or 1g / cm 3 .

[0173] For example, the density ρ1 of the second bending zone 31 is 0.5 g / cm 3 , 0.6g / cm 3 , 0.7g / cm 3 , 0.8g / cm 3 , 0.9g / cm 3 , 1g / cm 3 , 1.1g / cm 3 , 1.3g / cm 3 or 1.5g / cm 3 .

[0174] Optionally, the density ρ1 of the first bending zone 21 can be calculated by the following calculation formula: ρ1=(W1*L1*H2*ρ 正 ) / (π*(D2-D1)*(a / 360)*H1), wherein W1 is the thickness of the first pole tab 20 in a flattened state, L1 is the length of the first pole tab 20 along the winding direction, H2 is the length of the first pole tab 20 in a flattened state along the winding axis X, ρ 正 is the density of the first substrate, D1 and D2 are the minimum diameter and maximum diameter of the fan-shaped area of ​​the first bending zone 21 respectively, a is the central angle of the fan-shaped area of ​​the first bending zone 21, and H1 is the length of the first bending zone 21 along the winding axis.

[0175] Optionally, the density ρ2 of the second bending zone 31 can be calculated by the following calculation formula: ρ2=(W2*L2*H4*ρ 负) / (π*(D4-D3)*(a / 360)*H3), wherein W2 is the thickness of the second pole tab 30 in a flattened state, L2 is the length of the second pole tab 30 along the winding direction, H4 is the length of the second pole tab 30 in a flattened state along the winding axis X, ρ 负 is the density of the first substrate, D3 and D4 are the minimum diameter and maximum diameter of the fan-shaped area of ​​the second bending zone 31 respectively, a is the central angle of the fan-shaped area of ​​the second bending zone 31, and H3 is the length of the second bending zone 31 along the winding axis.

[0176] In these optional embodiments, by setting the density range of the first bending zone 21 and the second bending zone 31, the possibility of burning the isolation piece during welding due to too low density of the first bending zone 21 and the second bending zone 31 is reduced. In addition, the connection strength between the bending zone and the electrode terminal can be improved, and the possibility of insufficient welding strength between the bending zone and the electrode terminal can be reduced.

[0177] In some optional embodiments, the density ρ1 of the first bending zone 21 and the density ρ2 of the second bending zone 31 satisfy the relationship: ρ2>ρ1.

[0178] In these optional embodiments, since the first pole lug 20 and the second pole lug 30 are made of different materials, the material of the second pole lug 30 can be copper, so that the energy required for the second pole lug 30 during the welding process is greater than the energy required for the first pole lug 20 during the welding process. Through the above configuration, it is helpful to reduce the risk of poor welding between the second pole lug 30 and the electrode terminal during the welding process.

[0179] In some optional embodiments, see Figure 4 The electrode assembly is accommodated in the outer shell 111, and the outer shell 111 includes an end cap 111b and a shell 111a that are insulated from each other. The shell 111a includes at least one side opening, and the end cap 111b covers the opening. The first connecting member 60 is connected to one of the end cap 111b and the shell 111a, and the second connecting member 70 is connected to the other.

[0180] The housing 111 is used to encapsulate the electrode assembly 112 and the electrolyte and other components. The housing 111 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 111), or an aluminum-plastic film.

[0181] Exemplarily, the housing 111a may have an opening on one side, and an insulating member may be provided between the housing 111a and the end cover 111b. Optionally, a portion of the housing 111a may form the first connector 60. A portion of the end cover 111b may form the second connector 70.

[0182] Exemplarily, the first connecting member 60 is connected to the housing 111 a , and the second connecting member 70 is connected to the end cover 111 b .

[0183] In these optional embodiments, the above configuration simplifies the connection between the electrode assembly and the housing 111, reduces the difficulty of connecting the first electrode tab 20 and the second electrode tab with other structures in the cylindrical battery cell, and improves the reliability of the cylindrical battery cell.

[0184] In some optional embodiments, the cylindrical battery cell includes a housing 111 and electrode terminals, the electrode assembly is accommodated in the housing 111, the first connector 60 is connected to one of the housing 111 and the electrode terminal, and the connector is connected to the other.

[0185] Alternatively, a portion of the case 111 a may form the first connector 60 . At least a portion of the electrode terminal may form the second connector 70 .

[0186] Exemplarily, the first connector 60 is connected to the housing 111 , and the second connector 70 is connected to the electrode terminal.

[0187] Optionally, the housing 111 includes an end cover 111b and a shell 111a, and one of the end cover 111b and the shell 111a is connected to the first connector 60. For example, the end cover 111b is connected to the first connector 60. Or the shell 111a is connected to the first connector 60.

[0188] In these optional embodiments, the above-mentioned configuration is helpful to increase the application range of the electrode assembly to meet various design requirements and improve the applicability of the cylindrical battery cell.

[0189] Fig.13 yes Figure 4 In some optional embodiments, please refer to Figure 4 and Fig.13 The cylindrical battery cell includes an electrode terminal, the electrode terminal includes a first terminal 40 and a second terminal 50 , the first connector 60 is connected to the first terminal 40 , and the second connector 70 is connected to the second terminal 50 .

[0190] Optionally, the first connector 60 and the first terminal 40 may be an integral structure, and the first connector 60 is a part of the first terminal 40. Of course, the first connector 60 and the first terminal 40 may also be separate structures.

[0191] Exemplarily, the first connecting member 60 is a transition member.

[0192] Optionally, the second connector 70 and the second terminal 50 may be an integral structure, and the second connector 70 is a part of the second terminal 50. Of course, the second connector 70 and the second terminal 50 may also be a separate structure.

[0193] Exemplarily, the second connecting member 70 is a current collecting member.

[0194] Optionally, the first terminal 40 and the first bending region 21 may be connected by welding, for example, continuous welding, laser spot welding or other methods.

[0195] In these optional embodiments, the above configuration is helpful to reduce the size of the first bending zone 21 and the second bending zone 31 in the cylindrical battery cell, thereby reducing the overall size of the electrode assembly 112 and improving the energy density of the cylindrical battery cell 110.

[0196] In a second aspect, an embodiment of the present application provides a battery, comprising a cylindrical battery cell in any of the aforementioned embodiments.

[0197] In a third aspect, an embodiment of the present application provides an electrical device, comprising a battery in any of the aforementioned embodiments, and the battery is used to provide electrical energy.

[0198] According to some embodiments of the present application, please refer to Figures 4 to 9 The cylindrical battery cell 110 includes an electrode assembly 112, which includes a main body 10, a first pole tab 20 and a second pole tab 30. The electrode assembly 112 is cylindrical, and the first pole tab 20 and the second pole tab 30 are located on the same side of the main body 10 along the winding axis. The first pole tab 20 includes a first bending area 21, and the second pole tab 30 includes a second bending area 31. The surface of the first bending area 21 away from the main body 10 and the surface of the second bending area 31 away from the main body 10 are arranged flush. The size of the first pole tab 20 along the winding axis in the flattened state is smaller than the size of the second pole tab along the winding axis in the flattened state.

[0199] The first pole tab 20 is a positive pole tab, and the second pole tab 30 is a negative pole tab. The material of the first pole tab 20 includes aluminum, and the material of the second pole tab 30 includes copper. The thickness of the second pole tab 30 is less than that of the first pole tab 20.

[0200] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A cylindrical battery cell, characterized in that: include: shell; An electrode assembly, the electrode assembly is accommodated in the housing, the electrode assembly is cylindrical, the electrode assembly comprises a main body, a first pole ear and a second pole ear, the first pole ear and the second pole ear are located on the same side of the main body along the winding axis, and the first pole ear and the second pole ear have opposite polarities; A first connector, used for electrically connecting to the first electrode tab; A second connecting member, used for electrically connecting to the second electrode tab; Among them, the first pole ear includes a first bending zone, the first bending zone is used to connect with the first connecting member, the second pole ear includes a second bending zone, the second bending zone is used to connect with the second connecting member, and the surface of the first bending zone away from the main body and the surface of the second bending zone away from the main body are arranged flush.

2. The cylindrical battery cell according to claim 1, characterized in that: Along the winding axis, a size of the first pole tab in a flattened state is smaller than a size of the second pole tab in a flattened state.

3. The cylindrical battery cell according to claim 1, characterized in that: The number of the first pole lugs includes a plurality, the width of the first pole lug close to the inner winding circle is smaller than the width of the first pole lug close to the outer winding circle, and the first pole lug width is the size of the first pole lug along the winding direction; and / or The number of the second pole lugs includes multiple ones, the width of the second pole lug close to the inner winding circle is smaller than the width of the second pole lug close to the outer winding circle, and the second pole lug width is the size of the second pole lug along the winding direction.

4. The cylindrical battery cell according to claim 3, characterized in that: Along the direction away from the winding center, the widths of the first plurality of pole tabs and / or the second plurality of pole tabs gradually increase.

5. The cylindrical battery cell according to claim 1, characterized in that: The number of the first pole lugs includes a plurality, the length of the first pole lug close to the inner winding circle is less than the length of the first pole lug close to the outer winding circle, and the first pole lug length is the dimension of the first pole lug along the winding axis; and / or The number of the second pole lugs includes a plurality, the length of the second pole lug close to the inner winding circle is less than the length of the second pole lug close to the outer winding circle, and the length of the second pole lug is the dimension of the second pole lug along the winding axis.

6. The cylindrical battery cell according to claim 5, characterized in that: Along the direction away from the winding center, the lengths of the first plurality of pole tabs and / or the second plurality of pole tabs gradually increase.

7. The cylindrical battery cell according to claim 1, characterized in that: The second electrode tab has a thickness smaller than that of the first electrode tab.

8. The cylindrical battery cell according to claim 7, characterized in that: The number of the first pole lugs includes a plurality, and the thickness of the first pole lug close to the inner winding circle is less than the thickness of the first pole lug close to the outer winding circle; and / or The number of the second pole tabs includes a plurality, and the thickness of the second pole tab close to the inner winding circle is less than the thickness of the second pole tab close to the outer winding circle.

9. The cylindrical battery cell according to claim 8, characterized in that: Along the direction away from the winding center, the thickness of the plurality of first electrode tabs and / or the thickness of the plurality of second electrode tabs gradually increases.

10. The cylindrical battery cell according to claim 1, characterized in that: The first electrode tab is a positive electrode tab, and the second electrode tab is a negative electrode tab.

11. The cylindrical battery cell according to claim 1, characterized in that: The material of the first electrode tab includes aluminum, and the material of the second electrode tab includes copper.

12. The cylindrical battery cell according to claim 1, characterized in that: The density ρ1 of the first bending zone is 0.2 g / cm 3 ≤ρ1≤1g / cm 3 , and / or, the density ρ2 of the second bending zone is 0.5g / cm 3 ≤ρ2≤1.5g / cm 3 .

13. The cylindrical battery cell according to claim 1, characterized in that: The density ρ1 of the first bending zone and the density ρ2 of the second bending zone satisfy the relationship: ρ2>ρ1.

14. The cylindrical battery cell according to claim 1, characterized in that: The shell includes an end cover and a shell insulated from each other, the shell includes at least one opening on one side, the end cover covers the opening, the first connecting member is connected to one of the end cover and the shell, and the second connecting member is connected to the other.

15. The cylindrical battery cell according to claim 1, characterized in that: The battery cell includes a housing and an electrode terminal, the electrode assembly is accommodated in the housing, the first connector is connected to one of the housing and the electrode terminal, and the second connector is connected to the other.

16. The cylindrical battery cell according to claim 1, characterized in that: The battery cell includes an electrode terminal, and the electrode terminal includes a first terminal and a second terminal. The first connector is connected to the first terminal, and the second connector is connected to the second terminal.

17. A battery, characterized in that: Comprising a cylindrical battery cell as claimed in any one of claims 1 to 16.

18. An electrical device, characterized in that: Comprising a battery as claimed in claim 17, the battery is used to provide electrical energy.

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