Cylindrical current collector connecting structure, battery cell and battery

Abstract

The utility model relates to battery technology field, specifically disclose a cylindrical current collecting plate connecting structure, including roll core, first tab, first current collecting plate, riveting piece, roll core has first center hole, first tab is located one end of roll core, first tab has second center hole, first current collecting plate is located one side of first tab away from roll core, first current collecting plate has third center hole, riveting piece is located in second center hole and is abutted to the one end surface of roll core towards first current collecting plate, and at least part of riveting piece is located in third center hole, the utility model discloses riveting piece plays the role of dispersing welding heat, reduces the temperature of first current collecting plate local welding area, and simultaneously, riveting piece can provide mechanical support for the welding position, limit welding penetration, can realize accurate control welding penetration, avoid through defect, improve welding quality and battery overall reliability, reduce the rate of defective products in production process simultaneously, the utility model discloses a kind of battery and battery cell.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cylindrical current collector connection structure, a battery cell, and a battery. Background Technology

[0002] Currently, existing single-channel cylindrical batteries typically employ a process where the tabs are flattened and then directly welded to the current collector to achieve efficient current conduction within the battery. However, this process has the following drawbacks in actual production and application:

[0003] Because the current collector is relatively thin, the high temperature and concentrated welding energy during the welding process can easily lead to through-weld defects, meaning the weld penetration is too deep and extends through the current collector. This not only compromises the structural integrity of the current collector and reduces its mechanical strength, but can also cause serious safety hazards such as internal short circuits in the battery, significantly impacting the battery's performance stability and lifespan. Furthermore, through-weld defects also lead to poor battery consistency, increasing the defect rate during production and raising production costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to improve welding quality and overall battery reliability, and reduce the defect rate.

[0005] To solve the above-mentioned technical problems, this utility model provides a cylindrical manifold connection structure, comprising:

[0006] Core, the core having a first center hole;

[0007] A first electrode tab is disposed at one end of the winding core, and the first electrode tab has a second central hole;

[0008] A first current collector, disposed on the side of the first electrode tab away from the winding core, the first current collector having a third center hole; and,

[0009] A riveting component is disposed in the second central hole and abuts against one end face of the core facing the first collector plate. At least a portion of the riveting component passes through the third central hole, and at least a portion of the first collector plate is in contact with the riveting component.

[0010] More preferably, the distance between the inner wall of the second central hole and the inner wall of the first central hole is L, wherein the distance L satisfies: 1mm≤L≤2mm.

[0011] More preferably, the distance L satisfies: L = 1.5 mm.

[0012] More preferably, the riveting member includes an extension section and a main body section, the main body section being disposed within the second central hole, the extension section being disposed on the side of the main body section away from the core, and the extension section passing through the third central hole.

[0013] More preferably, the diameter D1 of the extension section and the diameter D2 of the main body section satisfy: D1 < D2, so that a supporting step structure is formed at the connection between the extension section and the main body section, and the diameter D2 of the main body section is greater than the diameter of the first center hole and the third center hole, at least a portion of the first collector plate is connected to the supporting step structure, and at least a portion of the main body section abuts against the end of the core.

[0014] More preferably, the height H of the first electrode tab satisfies: 1.5mm≤H≤2.5mm.

[0015] More preferably, the height H of the first electrode tab satisfies: H = 2 mm.

[0016] More preferably, the riveting component is a thermally conductive metal component.

[0017] This utility model also provides a battery cell, including a housing, a cap, and a cylindrical current collector connection structure as described above.

[0018] The cylindrical collector plate connection structure is located inside the housing. The end of the core away from the first electrode tab is provided with a second electrode tab. The housing has an opening. The cap is insulatedly connected to the opening of the housing. A second collector plate is provided between the second electrode tab and the cap. The cap is provided with an electrode post.

[0019] And / or, the electrode polarities of the first electrode and the second electrode are opposite.

[0020] This utility model also provides a battery, including the battery cell described above.

[0021] Compared with the prior art, the cylindrical current collector connection structure, battery cell, and battery provided by this utility model have the following advantages:

[0022] The present invention comprises a core, a first tab, and a first current collector, all having a central hole. A riveting component abuts against the end face of the core facing the first current collector. When the riveting component is placed in the second central hole, it corresponds to the position of the first central hole and is positioned on the side of the core facing the first current collector, thus supporting the riveting component. At least a portion of the riveting component passes through the third central hole, and at least a portion of the first current collector is in contact with the riveting component. During the welding process between the first current collector and the first tab, the riveting component can conduct and disperse the heat generated during welding, reducing the temperature of the local welding area of ​​the first current collector. Simultaneously, the riveting component located in the second central hole and on the first central hole provides mechanical support for the welding area, limiting the welding penetration depth. This enables precise control of the welding penetration depth, avoids through-hole defects, improves welding quality and overall battery reliability, and reduces the defect rate during production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the cylindrical collector disk connection structure described in this utility model.

[0024] Figure 2 This is a schematic diagram of the structure of the battery cell described in this utility model.

[0025] Figure label:

[0026] 10. Core; 11. First center hole; 20. First tab; 21. Second center hole; 30. First collector plate; 31. Third center hole; 40. Riveting piece; 41. Extension section; 42. Main body section; 50. Housing; 60. Second tab; 70. Second collector plate; 80. Cap; 90. Pole post. Detailed Implementation

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0028] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] like Figure 1 As shown, this utility model provides a cylindrical manifold connection structure, including a core 10, a first tab 20, a first manifold 30, and a riveting member 40; wherein, the core 10 has a first central hole 11; the first tab 20 is disposed at one end of the core 10 and has a second central hole 21; the first manifold 30 is disposed on the side of the first tab 20 away from the core 10 and has a third central hole 31; the riveting member 40 is disposed in the second central hole 21 and abuts against the end face of the core 10 facing the first manifold 30, and at least a portion of the riveting member 40 passes through the third central hole 31, and at least a portion of the first manifold 30 is in contact with the riveting member 40; after the riveting member 40 is placed in the second central hole 21, the riveting member 40 can correspond to the first central hole 11. The riveting element 40 is positioned on the side of the core 10 facing the first current collector 30, and the core 10 can support the riveting element 40. At least part of the riveting element 40 passes through the third center hole 31. Since at least part of the first current collector 30 is in contact with the riveting element 40, during the welding process between the first current collector 30 and the first electrode tab 20, the riveting element 40 plays a role in conducting and dispersing the heat generated by welding, reducing the temperature of the local welding area of ​​the first current collector 30. At the same time, the riveting element 40, which is located in the second center hole 21 and on the first center hole 11, can provide mechanical support for the welding part, limit the welding penetration, achieve precise control of the welding penetration, avoid penetration defects, improve welding quality and overall battery reliability, and reduce the defect rate in the production process.

[0035] In some embodiments, the first current collector 30 and the first tab 20 are welded together using methods such as laser welding or resistance welding. By introducing a riveting component 40 into the welding process, the welding method between the first current collector 30 and the first tab 20 is changed. Without significantly adjusting existing welding equipment and basic processes, the addition of the riveting component 40 alone can significantly improve welding quality and reduce the defect rate, balancing process feasibility and cost-effectiveness, and providing a reliable technical solution for the large-scale production of batteries. Compared to traditional methods such as optimizing welding parameters and replacing equipment, this solution only requires adding a riveting assembly step to the existing process. Without large-scale modifications to the production line, it can significantly reduce the welding defect rate, reduce rework and scrap costs, and improve production efficiency, making it suitable for the needs of large-scale industrial production.

[0036] In some embodiments, the second central hole 21 is coaxially arranged with the first central hole 11, and the diameter of the second central hole 21 is larger than the diameter of the first central hole 11. Specifically, the distance between the inner wall of the second central hole 21 and the inner wall of the first central hole 11 is L, wherein the distance L satisfies: 1mm ≤ L ≤ 2mm, so that the core 10 can provide effective support for the riveting member 40. Preferably, the distance L satisfies: L = 1.5mm.

[0037] In some implementations, the first tab 20 needs to be flattened so that it can fit tightly against the surface of the first current collector 30, ensuring welding quality and overall battery reliability, and reducing the defect rate.

[0038] In some embodiments, the riveting member 40 includes an extension 41 and a main body 42, the main body 42 being disposed within the second central hole 21, the extension 41 being disposed on the side of the main body 42 away from the core 10, and the extension 41 passing through the third central hole 31. Specifically, the diameter D1 of the extension section 41 and the diameter D2 of the main body section 42 satisfy: D1 < D2, so that a supporting step structure is formed at the connection between the extension section 41 and the main body section 42, and the diameter D2 of the main body section 42 is larger than the diameters of the first central hole 11 and the third central hole 31. At least a portion of the main body section 42 abuts against the end of the core 10, and at least a portion of the first collector plate 30 is connected to the supporting step structure. By adopting this scheme, the main body section 42 can form an annular supporting surface, which can support the first collector plate 30. During the welding process between the first collector plate 30 and the first electrode 20, the first collector plate 30 can withstand the welding pressure, limit the welding penetration, and prevent the first collector plate 30 from penetrating, thus fundamentally solving the defects of the existing welding process.

[0039] In some implementations, to ensure the welding quality between the first collector plate 30 and the first electrode tab 20, the height of the main body section 42 is the same as the height of the first electrode tab 20.

[0040] In some embodiments, the height H of the first electrode tab 20 satisfies: 1.5mm ≤ H ≤ 2.5mm. Wherein, the height H of the first electrode tab 20 ≥ 1.5mm can limit the welding penetration and avoid burn-through; the height H of the first electrode tab 20 ≤ 2.5mm can avoid uneven heat transfer during welding and ensure complete welding fusion between the first electrode tab 20 and the first collector plate 30, avoiding the formation of incomplete welds or weak connections; preferably, the height H of the first electrode tab 20 satisfies: H = 2mm.

[0041] In some embodiments, the riveting component 40 is a thermally conductive metal component, such as an aluminum alloy or a copper alloy, so that during the welding process between the first current collector 30 and the first tab 20, the riveting component 40 can disperse the welding heat, reduce the temperature of the local welding area of ​​the first current collector 30, and improve the welding quality and the overall reliability of the battery.

[0042] like Figure 2As shown, this utility model also provides a battery cell, which includes a housing 50, a cap 80, and a cylindrical current collector connection structure. The specific structure of the cylindrical current collector connection structure is as described in the above embodiments. Since this battery cell adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0043] In some embodiments, the cylindrical collector plate connection structure is located inside the housing 50, the end of the core 10 away from the first electrode 20 is provided with a second electrode 60, the housing 50 has an opening, the cap 80 is insulatedly connected to the opening of the housing 50, a second collector plate 70 is provided between the second electrode 60 and the cap 80, the cap 80 is provided with an electrode post 90, and the electrode post 90 is connected to the second collector plate 70.

[0044] In some embodiments, the first electrode 20 and the second electrode 60 have opposite electrode polarities. Preferably, the first electrode 20 is a negative electrode, the first current collector 30 is a negative current collector, the second electrode 60 is a positive electrode, and the second current collector 70 is a positive current collector.

[0045] In some embodiments, the battery cell also includes an electrolyte disposed within the housing 50. The core 10 includes a positive electrode, a negative electrode, and a separator disposed between the positive and negative electrode. The positive electrode, negative electrode, and separator are wound together to form the core 10. The battery cell mainly operates by the movement of metal ions between the positive and negative electrode. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector disk is connected to the positive current collector. The positive current collector includes a positive electrode coating area and a positive electrode tab connected to the positive electrode coating area. The positive electrode coating area is coated with the positive active material layer, while the positive electrode tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector plate is connected to the negative current collector. The negative current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area. The negative electrode coating area is coated with the negative active material layer, while the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes negative active material, which can be carbon or silicon, etc. The separator material can be PP (polypropylene) or PE (polyethylene), etc.

[0046] This utility model also provides a battery, which includes a cell. The specific structure of the cell is as described in the above embodiments. Since this battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0047] A battery is a device that converts chemical energy into electrical energy. It contains an electrolyte solution and metal electrodes to generate an electric current. With technological advancements, the term "battery" now generally refers to any small device that generates electrical energy, such as a solar cell. The main performance parameters of a battery are electromotive force, capacity, specific energy, and resistance. The principle of a battery is that chemical energy is directly converted into electrical energy through spontaneous oxidation and reduction reactions within the battery. These reactions occur at the two electrodes. The negative electrode active material consists of a reducing agent with a negative potential and stable in the electrolyte, such as active metals like zinc, cadmium, and lead, and hydrogen or hydrocarbons. The positive electrode active material consists of an oxidizing agent with a positive potential and stable in the electrolyte, such as metal oxides like manganese dioxide, lead dioxide, and nickel oxide, oxygen or air, halogens and their salts, and oxyacids and their salts. The electrolyte is a material with good ionic conductivity, such as aqueous solutions of acids, bases, and salts, organic or inorganic non-aqueous solutions, molten salts, or solid electrolytes.

[0048] This utility model also proposes a secondary battery, which includes a battery cell. The specific structure of the battery cell is as described in the above embodiments. Since this secondary battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0049] A rechargeable battery, also known as a secondary battery or accumulator, is a battery that can be recharged after being discharged, allowing the active materials to be reactivated and reused. Utilizing the reversibility of chemical reactions, a new battery can be constructed; that is, after a chemical reaction converts into electrical energy, the electrical energy can be used to repair the chemical system, and then the chemical reaction can be converted back into electrical energy. Therefore, it is called a secondary battery (rechargeable battery). The main types of rechargeable batteries on the market include nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid (or lead-acid) batteries, lithium-ion batteries, and polymer lithium-ion batteries.

[0050] This utility model also proposes an electrical device, which includes a secondary battery. The specific structure of the secondary battery is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0051] The electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power 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, etc. This application does not impose special limitations on the above-mentioned electrical equipment.

[0052] In summary, this utility model has a central hole in the core 10, the first tab 20, and the first current collector 30. After the riveting component 40 is placed in the second central hole 21, the riveting component 40 can correspond to the position of the first central hole 11 and be placed on the side of the core 10 facing the first current collector 30. The core 10 can support the riveting component 40. At least part of the riveting component 40 passes through the third central hole 31. Since at least part of the first current collector 30 is in contact with the riveting component 40, during the welding process between the first current collector 30 and the first tab 20, the riveting component 40 plays a role in conducting and dispersing the heat generated by welding, reducing the temperature of the local welding area of ​​the first current collector 30. At the same time, the riveting component 40, which is located in the second central hole 21 and on the first central hole 11, can provide mechanical support for the welding part, limit the welding penetration, achieve precise control of the welding penetration, avoid penetration defects, improve welding quality and overall battery reliability, and reduce the defect rate in the production process.

[0053] The above description is merely a preferred embodiment of this utility model. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this utility model, and these improvements and substitutions should also be considered within the protection scope of this utility model. The basic principles, main features, and advantages of this utility model have been shown and described above. For those skilled in the art, it is obvious that this utility model is not limited to the details of the above preferred embodiments. The embodiments should be considered exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this utility model.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cylindrical manifold connection structure, characterized in that, include: Core, the core having a first center hole; A first electrode tab is disposed at one end of the winding core, and the first electrode tab has a second central hole; A first current collector, disposed on the side of the first electrode tab away from the winding core, the first current collector having a third center hole; and, A riveting component is disposed in the second central hole and abuts against one end face of the core facing the first collector plate. At least a portion of the riveting component passes through the third central hole, and at least a portion of the first collector plate is in contact with the riveting component.

2. The cylindrical manifold connection structure according to claim 1, characterized in that, The distance between the inner wall of the second central hole and the inner wall of the first central hole is L, wherein the distance L satisfies: 1mm≤L≤2mm.

3. The cylindrical manifold connection structure according to claim 2, characterized in that, The distance L satisfies: L = 1.5 mm.

4. The cylindrical manifold connection structure according to claim 1, characterized in that, The riveting component includes an extension section and a main body section. The main body section is disposed in the second central hole, and the extension section is disposed on the side of the main body section away from the core. The extension section passes through the third central hole.

5. The cylindrical manifold connection structure according to claim 4, characterized in that, The diameter D1 of the extension section and the diameter D2 of the main body section satisfy: D1 < D2, so that a supporting step structure is formed at the connection between the extension section and the main body section, and the diameter D2 of the main body section is greater than the diameter of the first center hole and the third center hole. At least a portion of the first collector plate is connected to the supporting step structure, and at least a portion of the main body section abuts against the end of the core.

6. The cylindrical manifold connection structure according to claim 1, characterized in that, The height H of the first electrode lug satisfies: 1.5mm≤H≤2.5mm.

7. The cylindrical manifold connection structure according to claim 6, characterized in that, The height H of the first electrode ear satisfies: H = 2mm.

8. The cylindrical manifold connection structure according to claim 1, characterized in that, The riveting component is a thermally conductive metal component.

9. A battery cell, characterized in that, Includes a housing, a cap, and a cylindrical manifold connection structure as described in any one of claims 1-8; The cylindrical collector plate connection structure is located inside the housing. The end of the core away from the first electrode tab is provided with a second electrode tab. The housing has an opening. The cap is insulatedly connected to the opening of the housing. A second collector plate is provided between the second electrode tab and the cap. The cap is provided with an electrode post. And / or, the electrode polarities of the first electrode and the second electrode are opposite.

10. A battery, characterized in that, Includes the battery cell as described in claim 9.

Images