Cylindrical battery monomer, battery device and electric equipment

Abstract

The utility model discloses a cylindrical battery monomer, a battery device and electric equipment. The cylindrical battery monomer comprises an electrode assembly, a shell and a current collecting assembly, the electrode assembly comprises a tab, the shell comprises a shell body and an end cover, and the shell body is provided with a containing cavity for containing the electrode assembly. The current collecting assembly comprises a first insulating part and a current collecting disc which are connected with each other; the current collecting disc is used for electrically connecting the tab and the end cover; and at least part of the first insulating part is arranged between the tab and the shell so as to insulate the tab from the shell. The first insulating part comprises a connecting part and an insulating ring, and the outer diameter of the insulating ring is gradually increased in the direction from the current collecting disc to the electrode assembly. According to the structure, the first insulating part is integrated on the collector plate, so that the insulating property between the tab and the shell is improved, the operation process of wrapping an insulating layer outside the tab is cancelled, the manufacturing process is simplified, and the production efficiency is improved.

Description

Technical Field

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

[0002] Batteries are widely used in various electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy airplanes, electric toy ships, power tools and energy storage systems, etc.

[0003] At present, how to improve the manufacturing efficiency of battery cells and simplify the manufacturing process is also one of the research issues in this field. Utility Model Content

[0004] In view of the above problems, the present application provides a cylindrical battery cell, a battery device and an electrical equipment, which improves the insulation performance between the pole ear and the shell by integrating a first insulating part on the collecting plate, eliminates the process flow of wrapping the pole ear with an insulating layer, simplifies the manufacturing process and improves production efficiency.

[0005] In a first aspect, the present application provides a cylindrical battery cell, comprising an electrode assembly, a shell and a current collecting assembly. The electrode assembly comprises a pole lug, the shell comprises a shell and an end cap, and the shell has a receiving cavity for accommodating the electrode assembly. The current collecting assembly comprises a first insulating member and a current collecting plate connected to each other, and the current collecting plate is used to electrically connect the pole lug and the end cap. At least a portion of the first insulating member is disposed between the pole lug and the shell to insulate the pole lug from the shell. The first insulating member comprises a connecting portion and an insulating ring. The connecting portion is connected to a side surface of the current collecting plate away from the pole lug, and the connecting portion is arranged along the circumference of the current collecting plate. The insulating ring is arranged around the current collecting plate, and the insulating ring extends along the connecting portion in the direction toward the pole lug. The outer diameter of the insulating ring gradually increases along the direction of the current collecting plate toward the electrode assembly.

[0006] In the technical solution of the embodiment of the present application, the electrode assembly and the current collecting assembly are accommodated in the accommodating cavity of the shell by setting a shell, so as to provide a stable environment for the operation of the electrode assembly and reduce the influence of impurities or moisture on the electrode assembly. The current collecting disk electrically connects the pole ear with the end cover to transmit the electric energy generated by the electrode assembly. The first insulating member is provided to increase the creepage distance between the pole ear and the shell, improve the insulation performance between the pole ear and the shell, and reduce the risk of short circuit in the shell. The above structure improves the insulation performance between the pole ear and the shell by integrating the first insulating member on the current collecting disk, eliminates the operation process of wrapping the pole ear with an insulating layer, simplifies the manufacturing process, and improves production efficiency. The connecting part is used to stably connect the insulating ring with the current collecting disk, and improves the connection strength and stability between the first insulating member and the current collecting disk. The insulating ring is arranged around the outer periphery of the current collecting disk, which reduces the risk of short circuit between the current collecting disk and the pole ear and the shell, and improves the insulation effect. Furthermore, the outer diameter of the insulating ring gradually increases, which can guide the collector plate during assembly and reduce the risk of eccentricity of the collector plate. It can also protect the pole ear and reduce the risk of damage caused by scratches between the pole ear and the shell.

[0007] In some embodiments, the connecting portion and the insulating ring are integrally formed. In the above structure, the integrally formed structure improves the production efficiency of the first insulating member, reduces the difficulty of assembling the first insulating member and the current collecting plate, and improves the assembly efficiency of the current collecting assembly.

[0008] In some embodiments, the electrode assembly further includes a winding core, and the tab is connected to the winding core. The winding core is provided with an insulating layer, and the insulating ring extends between the insulating layer and the shell and is stacked with the insulating layer. In the above structure, an insulating layer is provided outside the winding core, which improves the insulation performance between the winding core and the shell. Extending the insulating ring between the insulating layer and the shell further reduces the risk of short circuit between the tab and the shell, and improves the insulation stability.

[0009] In some embodiments, the insulating ring surrounds the pole lug circumferentially and forms a pleated structure in the space between the pole lug and the shell. In the above structure, the insulating ring naturally forms pleats during the assembly process. The insulating ring itself has a certain flexibility and can automatically fill the redundant space of the shell. The pleats form a local overlap, which improves the insulation effect. Therefore, the above structure can fully utilize the space inside the shell while improving the insulation performance, thereby improving the space utilization rate.

[0010] In some embodiments, the current collecting assembly further includes a welding portion, the welding portion is connected between the current collecting plate and the pole ear, the welding portion includes a plurality of welding strips, the welding strips extend radially along the current collecting plate, and the plurality of welding strips are arranged at intervals along the circumference of the current collecting plate. In the above structure, the current collecting plate is connected to the pole ear by setting the welding portion. Furthermore, by setting a plurality of welding strips, the current carrying capacity of the current collecting plate can be improved, and the connection strength between the current collecting assembly and the electrode assembly can be improved.

[0011] In some embodiments, the connection portion has a first center hole, the orthographic projection of the first center hole on the current collecting disk overlaps with the center of the current collecting disk, the connection portion includes a body arranged along the circumference of the current collecting disk and a reinforcement portion formed by protruding along the body toward the first center hole, and the reinforcement portion is connected to a side surface of the current collecting disk away from the pole ear. In the above structure, the connection area between the connection portion and the current collecting disk is increased by providing the reinforcement portion, and the connection strength between the current collecting disk and the first insulation is improved.

[0012] In some embodiments, the reinforcing portion is disposed between two adjacent welding strips. The above structure reduces the risk of interference between the reinforcing portion and the welding strips, fully utilizes the space inside the connecting portion, and improves space utilization.

[0013] In some embodiments, a pole hole is provided on the end cover, and the cylindrical battery cell further includes a pole and a seal. The pole is provided in the pole hole, and the pole is connected to the surface of the collector plate on one side away from the pole ear. The seal is arranged around the pole, and the seal includes a first part arranged in the pole hole. In the above structure, the pole is provided to facilitate connection with other components to transmit the electric energy generated by the electrode assembly, and the seal is provided outside the pole, which improves the sealing performance, reduces the risk of moisture or impurities entering the interior of the shell, and improves the operating stability of the cylindrical battery cell.

[0014] In some embodiments, the pole includes a main body and an annular first protrusion protruding from the outer circumferential surface of the main body, the first protrusion is arranged between the collector plate and the end cover, and the seal also includes a second part arranged between the first protrusion and the end cover. In the above structure, the first protrusion is provided to limit the movement of the pole relative to the end cover, thereby improving the connection stability between the pole and the collector plate. By extending the seal between the first protrusion and the end cover, the sealing effect is further improved.

[0015] In some embodiments, the cylindrical battery cell further includes a second insulating member disposed on the surface of the end cap facing the current collecting plate, and the second insulating member is used to insulate the end cap and the current collecting plate. In the above structure, by providing the second insulating member, the creepage distance between the end cap and the current collecting plate is increased, the insulation performance between the end cap and the current collecting plate is improved, the risk of short circuit of the end cap is reduced, and the stability of the operation of the cylindrical battery cell is improved.

[0016] In a second aspect, the present application provides a battery device, which includes the cylindrical battery cell in the above embodiment.

[0017] In a third aspect, the present application provides an electrical device, which includes the battery device in the above embodiment, and the battery device is used to provide electrical energy.

[0018] 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

[0019] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0020] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0021] Figure 2 A schematic diagram of the exploded structure of a battery provided in some embodiments of the present application;

[0022] Figure 3 A schematic diagram of the structure of a cylindrical battery cell provided in some embodiments of the present application;

[0023] Figure 4 A schematic diagram of the structure of a cylindrical battery cell provided in some other embodiments of the present application;

[0024] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of the middle circle A;

[0025] Figure 6 A schematic diagram of the structure of a current collecting assembly provided in some embodiments of the present application;

[0026] Figure 7 A schematic diagram of the structure of a current collecting assembly provided in some other embodiments of the present application;

[0027] Figure 8 A schematic diagram of the structure of a current collecting assembly provided in some other embodiments of the present application;

[0028] Fig. 9 for Figure 4 Schematic diagram of the enlarged structure of the middle circle B.

[0029] DETAILED DESCRIPTION OF REFERENCE NUMERALS

[0030] 1. Vehicle; 2. Battery; 10. Electrode assembly; 11. Tab; 12. Winding core; 20. Shell; 25. Electrode terminal; 30. End cap; 301. Second insulating member; 40. Outer shell; 3. Controller; 4. Motor; 5. Box; 51. First box part; 52. Second box part; 53. Accommodating space; 6. Cylindrical battery cell; 7. Current collecting assembly; 701. First insulating member; 702. Current collecting plate; 703. Connecting part; 704. Insulating ring; 705. Corrugated structure; 706. Welding part; 707. Reinforcement part; 8. Pole; 801. First protrusion; 9. Seal; 901. First part; 902. Second part. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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).

[0037] 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.

[0038] 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.

[0039] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can 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 application generally indicates that the associated objects before and after are in an "or" relationship.

[0040] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0041] At present, in cylindrical battery cells, the tabs of the electrode assemblies are usually insulated by setting an insulating rubber layer to reduce the risk of leakage caused by a short circuit between the tabs and the shell. However, the insulating rubber layer is set outside the tabs by rubber coating, which requires high consistency in the diameter of the electrode assembly. In the process of rotating the rubber coating, the rubber layer is prone to wrinkling or even entanglement. In addition, the process of rubber coating is time-consuming, which reduces the overall production efficiency of cylindrical battery cells. In particular, during use, the insulating rubber easily loses its viscosity after being soaked in the electrolyte, and the insulation layer falls off, causing insulation failure, resulting in accidents, reducing the reliability of the operation of the cylindrical single battery, and shortening the cycle life of the cylindrical battery cell.

[0042] Based on the above problems, the embodiment of the present application provides a cylindrical battery cell, and a shell is provided to accommodate the electrode assembly and the current collecting assembly in the accommodating cavity of the shell, so as to provide a stable environment for them and reduce the influence of impurities or moisture on the operation of the electrode assembly. The current collecting plate electrically connects the pole ear with the end cover to transmit the electric energy generated by the electrode assembly. The first insulating member improves the insulation performance between the pole ear and the shell by increasing the creepage distance between the pole ear and the shell, and reduces the risk of short circuit in the shell. The above structure improves the insulation performance between the pole ear and the shell by integrating the first insulating member on the current collecting plate, eliminates the operation process of the outer insulation layer of the pole ear, simplifies the manufacturing process, and improves the production efficiency. In addition, the first insulating member has strong connection stability with the current collecting plate, reduces the risk of falling off, and improves the operation stability of the cylindrical battery cell. The connecting part is used to stably connect the insulating ring with the current collecting plate, and improves the connection strength and stability between the first insulating member and the current collecting plate. The insulating ring is arranged around the outer periphery of the current collecting plate, reduces the risk of short circuit between the current collecting plate and the pole ear and the shell, and improves the insulation effect. Furthermore, the outer diameter of the insulating ring gradually increases, which can guide the collector plate during assembly and reduce the risk of eccentricity of the collector plate. It can also protect the pole ear and reduce the risk of damage caused by scratches between the pole ear and the shell.

[0043] The cylindrical battery cell and battery device of the present application are described in detail below.

[0044] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0045] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0046] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0047] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0048] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0049] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0050] Battery cells may include but are not limited to lithium ion battery cells, sodium ion battery cells, sodium lithium ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium sulfur battery cells, magnesium ion battery cells, nickel metal hydride battery cells, nickel cadmium battery cells, lead storage battery cells, etc.

[0051] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no particular limitation in the present application.

[0052] 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.

[0053] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0054] The battery disclosed in the embodiments of the present application can be used in an electrical device that uses the battery as a power source or in various energy storage systems that use the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0055] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0056] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0057] like Figure 1 As shown, a battery 2 is disposed inside the vehicle 1, and the battery 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1.

[0058] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1 .

[0059] In some embodiments of the present application, the battery 2 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0060] Figure 2 Schematic diagram of the exploded structure of a battery provided for some embodiments of the present application.

[0061] The box 5 is used to accommodate the cylindrical battery cell 6, and the box 5 can be a variety of structures. In some embodiments, the box 5 can include a first box portion 51 and a second box portion 52, the first box portion 51 and the second box portion 52 cover each other, and the first box portion 51 and the second box portion 52 jointly define a storage space 53 for accommodating the cylindrical battery cell 6. The second box portion 52 can be a hollow structure with one end open, the first box portion 51 is a plate-like structure, and the first box portion 51 covers the open side of the second box portion 52 to form a box 5 with a storage space 53; the first box portion 51 and the second box portion 52 can also be a hollow structure with one side open, and the open side of the first box portion 51 covers the open side of the second box portion 52 to form a box 5 with a storage space 53. Of course, the first box portion 51 and the second box portion 52 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0062] In order to improve the sealing performance after the first box body 51 and the second box body 52 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 51 and the second box body 52 .

[0063] Assuming that the first box body portion 51 covers the top of the second box body portion 52 , the first box body portion 51 can also be referred to as an upper box cover, and the second box body portion 52 can also be referred to as a lower box body.

[0064] In the battery 2, there can be one or more cylindrical battery cells 6. If there are more than one cylindrical battery cells 6, the multiple cylindrical battery cells 6 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple cylindrical battery cells 6 are both connected in series and in parallel. The multiple cylindrical battery cells 6 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple cylindrical battery cells 6 is accommodated in the box 5; of course, multiple battery cells can also be connected in series, in parallel, or in mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and then accommodated in the box 5.

[0065] In some optional embodiments, the cylindrical battery cells 6 may also be directly accommodated in the box body 5 to reduce the connecting components or supporting components required to form the battery module and improve the energy density of the battery 2.

[0066] Exemplarily, the cylindrical battery cell 6 may be the smallest unit constituting the battery 2 .

[0067] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application.

[0068] like Figure 3 As shown, in some embodiments, the cylindrical battery cell 6 includes a housing 40 and an electrode assembly 10 accommodated in the housing 40 .

[0069] The electrode assembly 10 includes a positive electrode and a negative electrode. During the charge and discharge process of the cylindrical battery cell 6, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. Optionally, the electrode assembly 10 also includes a separator disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes while allowing active ions to pass through.

[0070] The housing 40 is used to encapsulate the electrode assembly 10 and the electrolyte and other components. The housing 40 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 40 ), or an aluminum-plastic film.

[0071] In some embodiments, the housing 40 includes a shell 20 and an end cover 30 . The shell 20 has an opening, and the end cover 30 is used to cover the opening.

[0072] The housing 20 is a component used to cooperate with the end cover 30 to form an internal cavity of the cylindrical battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte and other components.

[0073] The housing 20 and the end cap 30 may be separate components. For example, an opening may be provided on the housing 20, and the end cap 30 may be closed at the opening to form an internal cavity of the cylindrical battery cell 6.

[0074] The end cover 30 is connected to the housing 20 by welding, bonding, clamping or other methods.

[0075] In some embodiments, the cylindrical battery cell 6 further includes an electrolyte contained in the housing 40. The electrolyte plays a role in conducting ions between the positive and negative electrodes and can be in liquid, gel or solid state.

[0076] In some embodiments, the cylindrical battery cell 6 includes an electrode terminal 25. The electrode terminal 25 is electrically connected to the electrode assembly 10 to output or input electrical energy of the cylindrical battery cell 6.

[0077] In some embodiments, the cylindrical battery cell 6 includes a pressure relief mechanism, which is used to rupture when the internal pressure of the cylindrical battery cell 6 exceeds a threshold value to release the internal pressure of the cylindrical battery cell 6 .

[0078] Please refer to Figures 2 to 5 , Figure 2 A schematic diagram of the exploded structure of a battery provided in some embodiments of the present application, Figure 3 A schematic diagram of the structure of a cylindrical battery cell provided in some embodiments of the present application, Figure 4 This is a schematic diagram of the structure of a cylindrical battery cell provided in some other embodiments of the present application. Figure 5 for Figure 4 Schematic diagram of the enlarged structure of the middle circle A.

[0079] As shown in the figure, the cylindrical battery cell 6 includes an electrode assembly 10, a shell 40 and a current collecting assembly 7. The electrode assembly 10 includes a pole lug 11, and the shell 40 includes a shell 20 and an end cover 30, and the shell 20 has a receiving cavity for accommodating the electrode assembly 10. The current collecting assembly 7 includes a first insulating member 701 and a current collecting plate 702 connected to each other, and the current collecting plate 702 is used to electrically connect the pole lug 11 and the end cover 30. At least part of the first insulating member 701 is arranged between the pole lug 11 and the shell 20 to insulate the pole lug 11 from the shell 20. The first insulating member 701 includes a connecting portion 703 and an insulating ring 704. The connecting portion 703 is connected to a side surface of the current collecting plate 702 away from the pole lug 11, and the connecting portion 703 is arranged along the circumference of the current collecting plate 702. The insulating ring 704 is arranged around the current collecting plate 702, and the insulating ring 704 extends along the connecting portion 703 toward the pole lug 11. Along the direction from the current collecting plate 702 to the electrode assembly 10 , the outer diameter of the insulating ring 704 gradually increases.

[0080] The collecting plate 702 can be circular, rectangular, hexagonal or other shapes suitable for the application scenario, with a thickness of 0.1 mm to 1.5 mm, which can be adjusted according to needs. It can be made of materials with good conductivity and certain structural strength, such as copper, aluminum, steel and other metal materials.

[0081] The first insulating member 701 can be made of an insulating material with a certain elasticity, such as non-metallic insulating materials such as PET, PP, and PVC. Optionally, the first insulating member 701 can be processed into a film or a hard structure. Exemplarily, the film thickness is 0.01 mm to 0.1 mm. The first insulating member 701 is in the shape of a ring and matches the shape of the housing 40 to improve space utilization.

[0082] The current collecting plate 702 and the first insulating member 701 may be connected and fixed by means of thermal bonding, gluing or ultrasonic welding to improve the connection strength between the first insulating member 701 and the current collecting plate 702 .

[0083] Optionally, a first connection portion 703 is further provided between the current collecting plate 702 and the first insulating member 701 . The first connection portion 703 includes a connection ring arranged along the circumference of the current collecting plate 702 , or the first connection portion 703 includes a plurality of welding connection points arranged at intervals along the circumference of the current collecting plate 702 .

[0084] During the assembly process of the current collecting assembly 7, the moving assembly can be used to move the current collecting assembly 7 to one end of the electrode assembly 10 and place it toward the pole ear 11. Then, a pressing head is used to press the current collecting plate 702 and the pole ear 11 to perform preliminary positioning. Then, laser welding is used to weld the pole ear 11 and the current collecting plate 702. After the welding is completed, the current collecting assembly 7 is connected and fixed to the electrode assembly 10, and the first insulating member 701 is circumferentially around the pole ear 11 to achieve insulation.

[0085] In the technical solution of the embodiment of the present application, the outer shell 40 is provided to accommodate the electrode assembly 10 and the current collecting assembly 7 in the accommodating cavity of the outer shell 40, so as to provide a stable environment for the operation of the electrode assembly 10 and reduce the influence of impurities or moisture on the electrode assembly 10. The current collecting plate 702 electrically connects the pole ear 11 with the end cover 30 to transmit the electric energy generated by the electrode assembly 10. The first insulating member 701 is provided to increase the creepage distance between the pole ear 11 and the shell 20, improve the insulation performance between the pole ear 11 and the shell 20, and reduce the risk of short circuit of the shell 20. The above structure improves the insulation performance between the pole ear 11 and the shell 20 by integrating the first insulating member 701 on the current collecting plate 702, and eliminates the operation process of the outer insulation layer of the pole ear 11, thereby simplifying the manufacturing process and improving the production efficiency. The connecting portion 703 is used to stably connect the insulating ring 704 with the current collecting plate 702, thereby improving the connection strength and stability between the first insulating member 701 and the current collecting plate 702. The insulating ring 704 is arranged around the outer periphery of the current collecting disc 702, which reduces the risk of short circuit between the current collecting disc 702 and the pole ear 11 and the shell 20, and improves the insulation effect. Furthermore, the outer diameter of the insulating ring 704 gradually increases, which can support and guide the current collecting disc 702, thereby reducing the risk of eccentricity of the current collecting disc 702 during installation or use. The insulating ring 704 can protect the pole ear 11 during the process of the electrode assembly 10 being inserted into the shell. The outer diameter of the insulating ring 704 gradually increases, which can reduce the direct contact between the pole ear 11 and the shell 20, thereby reducing the risk of scratches and breakage.

[0086] In some embodiments of the present application, the connecting portion 703 and the insulating ring 704 are integrally formed structures. An integrally formed structure refers to a structure that can be obtained by processing the material once without the need for secondary processing.

[0087] The one-piece structure improves the production efficiency of the first insulating member 701 , reduces the difficulty of assembling the first insulating member 701 and the current collecting plate 702 , and improves the assembly efficiency of the current collecting assembly 7 .

[0088] In some embodiments of the present application, the electrode assembly 10 further includes a winding core 12, and the electrode tab 11 is connected to the winding core 12. The winding core 12 is covered with an insulating layer, and the insulating ring 704 extends between the insulating layer and the shell 20 and is stacked with the insulating layer.

[0089] The winding core 12 is formed by stacking the positive electrode sheet, the negative electrode sheet and the separator and then winding them. The tabs 11 include the positive electrode tab 11 and the negative electrode tab 11. The positive electrode tab 11 is connected to the positive electrode sheet, and the negative electrode tab 11 is connected to the negative electrode sheet.

[0090] In the above structure, an insulating layer is disposed outside the winding core 12, which improves the insulation performance between the winding core 12 and the shell 20. The insulating ring 704 is extended between the insulating layer and the shell 20, which further reduces the risk of short circuit between the tab 11 and the shell 40 and improves the insulation stability.

[0091] like Figure 7 As shown, in some embodiments of the present application, the insulating ring 704 surrounds the pole lug 11 circumferentially and forms a corrugated structure 705 in the space between the pole lug 11 and the housing 20 .

[0092] In the above structure, the insulating ring 704 itself has a certain flexibility and can be automatically filled into the redundant space of the shell 40. The insulating ring 704 forms a close contact with the shell 40, thereby improving the insulation effect. The folded parts form a local overlap, which increases the local number of layers and thickness of the insulating ring 704, thereby improving the insulation performance. The overlapping part can more effectively block the transfer of current, extend the creepage distance between the tab 11 and the shell 20, and improve the insulation effect. In addition, the insulating ring 704 can automatically fill the redundant space of the shell 40 during the assembly process to form a folded structure 705, providing more insulation layers without increasing the extra volume, while improving the insulation performance. It can also make full use of the space inside the shell 40 and improve space utilization.

[0093] like Figures 5 to 7 As shown, in some embodiments of the present application, the current collecting assembly 7 further includes a welding portion 706, the welding portion 706 is connected between the current collecting disc 702 and the pole lug 11, the welding portion 706 includes a plurality of welding strips, the welding strips extend radially along the current collecting disc 702, and the plurality of welding strips are arranged at intervals along the circumference of the current collecting disc 702. The welding portion 706 is used to connect the current collecting disc 702 with the pole lug 11, and the current can be transmitted from the current collecting disc 702 to the pole lug 11 through the welding portion 706, and then further transmitted to other parts of the battery 2.

[0094] Optionally, the welding strip can be straight or curved. The curved welding strip prolongs the welding length, increases the welding area, and improves the connection strength and flow area between the electrode tab 11 and the current collecting plate 702.

[0095] For example, the welding strip can be formed by melting, mixing and cooling the materials of the current collecting plate 702 and the tab 11. The above structure can reduce the weight of the current collecting assembly 7 and improve the energy density of the cylindrical battery cell 6 without adding new welding materials.

[0096] In the above structure, the current collecting plate 702 is connected to the pole lug 11 by setting a welding portion 706. Furthermore, by setting a plurality of welding strips, the current carrying capacity of the current collecting plate 702 is improved, and the plurality of welding strips provide more current channels, so that the current can be more evenly distributed on the current collecting plate 702, thereby reducing the risk of local overheating and excessive resistance. The plurality of welding strips are arranged at intervals along the circumference of the current collecting plate 702, which not only increases the contact area between the welding portion 706 and the current collecting plate 702 and the pole lug 11, but also improves the connection strength therebetween, making the current collecting assembly 7 more stable during the use of the battery 2, and reducing the risk of connection failure due to vibration or temperature changes.

[0097] In some optional embodiments, the connecting portion 703 has a first center hole, and the orthographic projection of the first center hole on the current collecting disk 702 overlaps with the center of the current collecting disk 702. It can be understood that the first center hole refers to a through hole set at the geometric center of the connecting portion 703, the current collecting disk 702 is circular, and the center of the current collecting disk 702 is the geometric center of the disk.

[0098] The first center hole is coaxially arranged with the center of the collecting plate 702 and has the same diameter and direction.

[0099] The above structure provides a clear alignment reference during the assembly process of the electrode assembly 10, and the assembler can more easily align and fix the connection part 703 with the collector plate 702, thereby simplifying the assembly process and improving the accuracy and efficiency of the assembly. The connection part 703 and the collector plate 702 are more compactly combined during assembly, reducing the position offset between them. This saves radial space in the housing 40, allowing the battery 2 to accommodate more active materials or other key components, thereby improving space utilization.

[0100] The above structure improves the energy density of the cylindrical battery cell 6 and improves the assembly convenience of the electrode assembly 10 .

[0101] like Figure 8 As shown, in some embodiments of the present application, the connecting portion 703 includes a body arranged along the circumference of the collecting plate 702 and a reinforcing portion 707 protruding from the body toward the first center hole, and the reinforcing portion 707 is connected to a side surface of the collecting plate 702 away from the pole ear 11.

[0102] The connecting portion 703 includes a main body and a reinforcing portion 707. The main body is arranged along the circumference of the current collecting disk 702 and is the main structural part of the connecting portion 703. The main body can be arranged in a circular ring shape around the current collecting disk 702. The reinforcing portion 707 is formed by protruding along the direction of the main body toward the first center hole, and the reinforcing portion 707 is connected to the main body. Optionally, the reinforcing portion 707 and the main body are an integrally formed structure.

[0103] The reinforcement part 707 is connected to a surface of the current collecting plate 702 which is away from the pole lug 11 . The reinforcement part 707 may overlap with the current collecting plate 702 , or the reinforcement part 707 and the current collecting plate 702 may be welded, bonded or hot-pressed.

[0104] The above technical solution increases the contact area between the connection part 703 and the current collecting disk 702 by setting the reinforcement part 707, disperses the stress between the connection part 703 and the current collecting disk 702, and improves the stability and reliability of the connection. In addition, the reinforcement part 707 increases the connection area and provides support for the current collecting disk 702, so that the connection between the connection part 703 and the current collecting disk 702 is more secure and can withstand greater forces and vibrations, thereby improving the durability and reliability of the entire electrode assembly 10. The design of the reinforcement part 707 also takes into account the compactness of the structure and the space utilization. By protruding along the direction of the main body toward the first center hole, the reinforcement part 707 can make full use of the space on the back of the current collecting disk 702 without occupying too much other space inside the battery 2, further improving the energy density and overall performance of the battery 2.

[0105] In some embodiments of the present application, the reinforcing portion 707 is disposed between two adjacent welding strips. The above structure reduces the risk of interference between the reinforcing portion 707 and the welding strips, fully utilizes the space inside the connecting portion 703, and improves space utilization.

[0106] like Figure 4 as well as Fig. 9 As shown, in some embodiments of the present application, a pole hole is provided on the end cover 30, and the cylindrical battery cell 6 also includes a pole 8 and a seal 9. The pole 8 is provided in the pole hole, and the pole 8 is connected to the side surface of the collector 702 away from the pole ear 11. The seal 9 is arranged around the pole 8, and the seal 9 includes a first part 901 arranged in the pole hole. In the above structure, the pole 8 is provided to facilitate connection with other components to transmit the electric energy generated by the electrode assembly 10, and the seal 9 is provided outside the pole 8, which improves the sealing performance, reduces the risk of moisture or impurities entering the interior of the outer shell 40, and improves the operating stability of the cylindrical battery cell 6.

[0107] In some embodiments of the present application, the pole 8 includes a main body and an annular first protrusion 801 protruding from the outer circumference of the main body, the first protrusion 801 is arranged between the current collecting plate 702 and the end cover 30, and the seal 9 also includes a second portion 902 arranged between the first protrusion 801 and the end cover 30. In the above structure, the first protrusion 801 is provided to limit the movement of the pole 8 relative to the end cover 30, thereby improving the connection stability between the pole 8 and the current collecting plate 702. By extending the seal 9 between the first protrusion 801 and the end cover 30, the sealing effect is further improved.

[0108] In some embodiments of the present application, the cylindrical battery cell 6 further includes a second insulating member 301 disposed on the surface of the end cap 30 facing the current collecting plate 702, and the second insulating member 301 is used to insulate the end cap 30 and the current collecting plate 702. In the above structure, by providing the second insulating member 301, the creepage distance between the end cap 30 and the current collecting plate 702 is increased, the insulation performance between the end cap 30 and the current collecting plate 702 is improved, the risk of short circuit of the end cap 30 is reduced, and the stability of the operation of the cylindrical battery cell 6 is improved.

[0109] In some optional embodiments, the cylindrical battery cell 6 includes an electrode assembly 10, a shell 40 and a current collecting assembly 7. The electrode assembly 10 includes a pole lug 11, the shell 40 includes a shell 20 and an end cap 30, and the shell 20 has a housing cavity for accommodating the electrode assembly 10. The current collecting assembly 7 includes a first insulating member 701 and a current collecting plate 702 connected to each other, and the current collecting plate 702 is used to electrically connect the pole lug 11 and the end cap 30. At least part of the first insulating member 701 is disposed between the pole lug 11 and the shell 20 to insulate the pole lug 11 from the shell 20. The first insulating member 701 includes a connecting portion 703 and an insulating ring 704. The connecting portion 703 is connected to a side surface of the current collecting plate 702 away from the pole lug 11, and the connecting portion 703 is arranged along the circumference of the current collecting plate 702. The insulating ring 704 is arranged around the current collecting plate 702, and the insulating ring 704 extends along the connecting portion 703 toward the pole lug 11. The connecting portion 703 and the insulating ring 704 are an integrally formed structure. The electrode assembly 10 also includes a winding core 12, and the pole lug 11 is connected to the winding core 12. The winding core 12 is provided with an insulating layer, and the insulating ring 704 extends between the insulating layer and the shell 20 and is stacked with the insulating layer. The outer diameter of the insulating ring 704 gradually increases along the direction of the current collecting disk 702 toward the electrode assembly 10. The current collecting assembly 7 also includes a welding portion 706, which is connected between the current collecting disk 702 and the pole lug 11. The welding portion 706 includes a plurality of welding strips, which extend radially along the current collecting disk 702, and the plurality of welding strips are arranged at intervals along the circumference of the current collecting disk 702. A pole hole is provided on the end cover 30, and the cylindrical battery cell 6 also includes a pole 8 and a seal 9. The pole 8 is provided in the pole hole, and the pole 8 is connected to the side surface of the current collecting disk 702 away from the pole lug 11. The seal 9 is arranged around the pole 8, and the seal 9 includes a first portion 901 arranged in the pole hole. The pole 8 includes a main body and an annular first protrusion 801 protruding from the outer circumference of the main body, the first protrusion 801 is arranged between the collecting plate 702 and the end cover 30, and the seal 9 also includes a second portion 902 arranged between the first protrusion 801 and the end cover 30.

[0110] An embodiment of the present application provides a battery device, which includes the cylindrical battery cell 6 in the above embodiment. By providing a shell 40, the electrode assembly 10 and the current collecting assembly 7 are accommodated in the accommodating cavity of the shell 40, providing a stable environment for the operation of the electrode assembly 10, and reducing the impact of impurities or moisture on the electrode assembly 10. The current collecting plate 702 electrically connects the pole ear 11 with the end cover 30 to transmit the electric energy generated by the electrode assembly 10. The first insulating member 701 is provided to increase the creepage distance between the pole ear 11 and the shell 20, improve the insulation performance between the pole ear 11 and the shell 20, and reduce the risk of short circuit in the shell 20. The above structure integrates the first insulating member 701 on the current collecting plate 702, improves the insulation performance between the pole ear 11 and the shell 20, eliminates the operation process of the pole ear 11 outer insulation layer, simplifies the manufacturing process, and improves production efficiency.

[0111] The embodiment of the present application also provides an electric device, which includes the battery device in the above embodiment, and the battery device is used to provide electric energy. The electric device includes the battery device in the above embodiment, and can also achieve the above technical effects, which will not be described in detail here.

[0112] 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, It is characterized in that include: Electrode assembly, including tabs; A housing, comprising a shell and an end cover, wherein the shell has a housing cavity for housing the electrode assembly; A current collecting assembly comprises a first insulating member and a current collecting plate which are connected to each other, wherein the current collecting plate is used to electrically connect the pole lug and the end cover, wherein at least a portion of the first insulating member is disposed between the pole lug and the shell to insulate the pole lug from the shell, wherein the first insulating member comprises a connecting portion and an insulating ring, wherein the connecting portion is connected to a surface of the current collecting plate which is away from the pole lug, and the connecting portion is disposed along the circumference of the current collecting plate, the insulating ring is disposed around the current collecting plate, and the insulating ring extends along the connecting portion toward the pole lug, and the outer diameter of the insulating ring gradually increases along the direction from the current collecting plate toward the electrode assembly.

2. The cylindrical battery cell according to claim 1, It is characterized in that The connecting portion and the insulating ring are an integrally formed structure.

3. The cylindrical battery cell according to claim 2, It is characterized in that The electrode assembly further includes a winding core, the electrode tab is connected to the winding core, an insulating layer is provided on the winding core jacket, and the insulating ring extends between the insulating layer and the shell and is stacked with the insulating layer.

4. The cylindrical battery cell according to claim 1, It is characterized in that The insulating ring surrounds the pole lug circumferentially and forms a corrugated structure in the space between the pole lug and the shell.

5. The cylindrical battery cell according to any one of claims 1 to 4, It is characterized in that The current collecting assembly further includes a welding portion connected between the current collecting plate and the pole lug, and the welding portion includes a plurality of welding bars extending radially along the current collecting plate, and the plurality of welding bars are arranged at intervals along the circumference of the current collecting plate.

6. The cylindrical battery cell according to claim 5, It is characterized in that The connecting portion has a first center hole, the orthographic projection of the first center hole on the current collecting disk overlaps with the center of the current collecting disk, the connecting portion includes a main body arranged along the circumference of the current collecting disk and a reinforcement portion protruding along the main body toward the first center hole, and the reinforcement portion is connected to a side surface of the current collecting disk away from the pole ear.

7. The cylindrical battery cell according to claim 6, It is characterized in that The reinforcement portion is arranged between two adjacent welding strips.

8. The cylindrical battery cell according to any one of claims 1 to 4, It is characterized in that The end cover is provided with a pole hole, and the cylindrical battery cell further comprises: A pole, disposed in the pole hole, the pole being connected to a surface of the collector plate facing away from the pole ear; A sealing member is arranged around the pole, and the sealing member comprises a first portion arranged in the pole hole.

9. The cylindrical battery cell according to claim 8, It is characterized in that The pole includes a main body and a first annular protrusion protruding from the outer circumference of the main body, the first protrusion is arranged between the collecting plate and the end cover, and the seal also includes a second part arranged between the first protrusion and the end cover.

10. The cylindrical battery cell according to any one of claims 1 to 4, It is characterized in that The cylindrical battery cell further includes a second insulating member disposed on a surface of the end cover facing the current collecting plate, and the second insulating member is used for insulating the end cover from the current collecting plate.

11. A battery device, It is characterized in that The invention comprises a cylindrical battery cell as claimed in any one of claims 1 to 10.

12. An electrical device, It is characterized in that The electrical equipment comprises the battery device as claimed in claim 11, wherein the battery device is used to provide electrical energy.

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