Current collector plate and cylindrical battery

Abstract

The utility model relates to a cylindrical battery, specifically provide a current collection disc and cylindrical battery, aims at solving the problem that the positive pole column and current collection disc of existing torque welding connection are easy to produce metal particle in the welding process, influence the safety of electric core, for this purpose, a current collection disc of the utility model includes welding part and convex ring, the convex ring is set in the welding part outside. The utility model discloses a convex ring structure is set outside the welding part of positive current collection disc, can play the effective protection effect in the electric core torque welding process. The convex ring can block the metal particle produced in the welding process, and collect it in the predetermined area, prevent the particle to splash. The structure still maintained the simplicity of torque welding process and the mechanical stability of current collection disc whole.

Description

Technical Field

[0001] This utility model relates to cylindrical batteries, specifically providing a current collector and a cylindrical battery. Background Technology

[0002] In the manufacturing process of existing cylindrical battery cells, the connection between the positive terminal and the positive current collector is typically achieved through welding to ensure stable and reliable current conduction. Among various welding processes, torque welding is widely used due to its advantages such as simple structural design, short process flow, and fewer assembly steps. Torque welding can achieve a strong bond between the positive terminal and the current collector in a shorter time, reducing reliance on additional fasteners or auxiliary connection structures, thus effectively simplifying the cell structure. Simultaneously, this process can reduce material and processing costs, improve production automation, increase production efficiency, and meet the consistency and reliability requirements of large-scale battery cell manufacturing.

[0003] However, during the torque welding process to connect the positive terminal and the current collector, the significant mechanical friction and heat generated during welding can easily lead to microscopic peeling or melting of the metal surface, resulting in a large number of fine metal particles. These particles can splash during welding due to vibration or airflow, and some may enter the internal structure of the battery cell, especially between the electrode layers and the separator, causing internal contamination. Once these metal particles enter the electrode layers, they may puncture the separator or form an electrochemical short circuit, severely impacting the cell's safety performance and cycle life. While existing technologies attempt to improve this by optimizing welding parameters or adding protective structures, it remains difficult to fundamentally eliminate the problem of metal particle splashing during torque welding, particularly at the outer edge of the welding area between the current collector and the positive terminal, where potential safety hazards and risks still exist.

[0004] Therefore, there is an urgent need in this field for a current collector and a cylindrical battery to solve the above problems. Utility Model Content

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem that metal particles are easily generated during the welding process of the positive electrode post and current collector of the existing torque welding connection, which affects the safety of the battery cell.

[0006] In a first aspect, the present invention provides a current collector for a cylindrical battery, the cylindrical battery including terminals, the current collector including a welding part and a convex ring, the welding part being connected to the terminals by torque welding, the convex ring being disposed outside the welding part, and the convex ring being disposed in the direction away from the terminals of the current collector.

[0007] In a specific embodiment of the above-mentioned collector plate, the collector plate also includes a body, and the convex ring is integrally formed with the body.

[0008] In the specific embodiment of the above-mentioned manifold, the welded part and the convex ring are integrally formed.

[0009] In the specific implementation of the above-mentioned manifold, the thickness of the manifold ranges from 0.1 mm to 1 mm.

[0010] In the specific embodiment of the above-described manifold, the height of the convex ring ranges from 0.2 mm to 3 mm; and / or

[0011] The width of the convex ring ranges from 0.2 mm to 2 mm; and / or

[0012] The diameter of the convex ring ranges from 2 mm to 8 mm.

[0013] In a specific embodiment of the above-mentioned collector plate, the collector plate is provided with multiple through holes, which are arranged around the outside of the convex ring, and an anti-torsion bridge is formed between two adjacent through holes.

[0014] In the specific embodiment of the above-mentioned manifold, a plurality of the anti-torsion bridges are evenly arranged along the outer side of the convex ring.

[0015] In the specific embodiment of the above-mentioned manifold, the width of the anti-torsion bridge ranges from 0.2mm to 6mm; and / or

[0016] The length of the anti-torsion bridge ranges from 0.2 mm to 6 mm; and / or

[0017] The number of anti-torsion bridges ranges from 2 to 32.

[0018] In a second aspect, the present invention provides a cylindrical battery, which includes the current collector as described above.

[0019] In the specific embodiment of the above cylindrical battery, the cylindrical battery further includes a wound core separator, the electrode post is disposed on the first side of the current collector, the wound core separator is disposed on the second side of the current collector, one end of the wound core separator abuts against the current collector, and the wound core separator, the convex ring and the welded part form a closed space.

[0020] By employing the above technical solution, this invention provides effective protection during the torque welding process of the battery cell by providing a raised ring structure on the outer side of the welding portion of the positive current collector. This raised ring blocks metal particles generated during welding and collects them in a predetermined area, preventing particle splashing. This structure also maintains the simplicity of the torque welding process and the overall mechanical stability of the current collector.

[0021] Furthermore, by setting multiple through holes with surrounding convex rings on the current collector and forming anti-torsion bridges between adjacent through holes, this invention can play a role in stress dispersion and absorption during torque welding. When the welding head contacts the welding part and generates mechanical friction, the welding part may undergo slight deformation. The anti-torsion bridge can deform appropriately accordingly to absorb the deformation stress generated during welding, thereby preventing stress concentration from causing deformation or damage to the overall structure of the current collector. In addition, the design of the anti-torsion bridge can also reduce metal debris generated during torque welding, reducing the risk of debris entering the core. The synergistic design of the through holes and the anti-torsion bridge not only maintains the structural stability of the current collector but also ensures reliable welding quality, effectively improving the safety and durability of the battery cell in long-term use, extending cycle life, and ensuring its stable performance and reliable operation under high-intensity operating environments.

[0022] Furthermore, by uniformly arranging multiple anti-torsion bridges along the circumference of the current collector, this invention can evenly disperse and effectively absorb the deformation stress generated during torque welding, thereby avoiding localized deformation or structural damage caused by stress concentration. During welding, the anti-torsion bridges adjust their shape appropriately to accommodate slight deformations in the welded area, achieving stress buffering and dispersion, ensuring the current collector maintains a stable geometric shape and structural integrity. Simultaneously, the uniform arrangement of the anti-torsion bridges improves the reliability of welding quality and reduces the impact of micro-debris generated during welding on the core and separator, thus lowering the risk of internal cell contamination. Through this design, the current collector maintains good mechanical stability and conductivity under high-intensity welding and long-term use conditions, effectively improving the overall safety, performance stability, and cycle life of the cell, providing a solid guarantee for the manufacture of high-reliability cells.

[0023] Furthermore, by positioning the convex ring on the outer side of the welded portion and extending it protruding away from the electrode post, the convex ring, the core diaphragm, and the welded portion spatially enclose each other to form a relatively closed cavity structure. This closed space effectively shields and isolates the welding area during torque welding, thereby blocking and collecting metal particles or tiny debris generated by welding friction, preventing them from scattering or entering the core diaphragm area, and avoiding contamination of the electrode layer and electrolyte system. Through the above structural design, the mechanical damage and potential short-circuit risk caused by metal particles to the diaphragm can be significantly reduced, improving the cleanliness of the internal environment of the cell and the overall safety. At the same time, this structure retains the advantages of simplified torque welding connection and efficient process flow, which is conducive to achieving consistency in mass production and long-term reliable operation of the cell structure. Attached Figure Description

[0024] The preferred embodiments of this utility model are described below with reference to the accompanying drawings, in which:

[0025] Figure 1This is a schematic diagram of the structure of the collector plate provided by this utility model;

[0026] Figure 2 This is a schematic diagram of the internal structure of the cylindrical battery provided by this utility model.

[0027] List of reference numerals in the attached diagram:

[0028] 1. Collector plate; 11. Body; 12. Welding part; 13. Convex ring; 14. Through hole; 15. Anti-torsion bridge; 2. Pole post. Detailed Implementation

[0029] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0030] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" 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 direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] A battery cell is the basic energy storage unit in a battery, and it is the core structural component that enables the conversion between electrical energy and chemical energy. A complete battery is usually composed of multiple cells, which are connected in series or parallel to form a battery module or battery pack according to usage requirements, to meet different voltage and capacity requirements. A battery cell typically includes basic components such as a positive electrode, a negative electrode, and a separator. The battery cell in this embodiment is a cylindrical cell, whose internal structure consists of a positive electrode, a negative electrode, and a separator wound together to form a core structure, which has the advantages of compact structure, good heat dissipation performance, and high energy density. The two ends of the core achieve effective current output through current collectors and terminals, respectively, thereby ensuring the conductivity reliability and safety performance of the cell during charging and discharging, making it suitable for various power batteries or energy storage systems.

[0033] The current collector is a crucial structural component in a battery used for collecting and conducting current. It is typically located at the top or bottom of the battery cell to achieve efficient energy transfer between the cell's interior and external circuitry. In this embodiment, the current collector is a positive current collector, positioned at the top of the battery cell. One end is reliably connected to the terminal post via welding or a conductive connection, while the other end is connected to the positive electrode plate inside the cell. The main function of the current collector is to collect and conduct the current generated or stored in the positive electrode plate to the external circuitry, thereby ensuring stable current transmission and excellent conductivity during charging and discharging. To improve conductivity and mechanical strength, the current collector can be made of highly conductive metal materials and can be reinforced with ribs or heat dissipation structures according to design requirements to further improve heat dissipation and overall reliability, ensuring the battery's safety and stability under long-term operating conditions.

[0034] To address the issue that existing torque-welded positive terminal and current collector connections are prone to generating metal particles during the welding process, which affects the safety of the battery cell, this embodiment discloses a cylindrical battery, which includes a current collector, a terminal, and a wound separator.

[0035] Reference Figure 1 The collector plate 1 includes a body 11, a welding part 12, a convex ring 13, and an anti-torsion part.

[0036] The body 11 is disc-shaped, and the thickness of the collector 1 ranges from 0.1 mm to 1 mm. The shape of the collector 1 body 11 is basically the same as that of the collector 1 in the prior art, and its specific structure will not be described in detail here.

[0037] The welded section 12 is located in the middle of the main body 11 of the manifold 1. This arrangement facilitates the uniform distribution of structural forces, avoids localized stress concentration, and thus ensures the stability and long-term reliability of the welded connection. (Refer to...) Figure 2 The welding part 12 is firmly connected to the electrode post 2 by torque welding. The shape of the electrode post 2 is basically the same as that of the common positive electrode post in the prior art, and its specific structure and size design will not be described in detail here. Torque welding is a highly efficient solid-state bonding process that can achieve a strong bond between materials without melting the metal, effectively ensuring the mechanical strength and conductivity of the weld. Through this welding method, the continuity of the conductive path can be maintained while improving assembly accuracy and reducing the occurrence of defects such as incomplete welding and misaligned welding. The connection method of torque welding can not only effectively simplify the cell structure and reduce the use of additional fasteners or welding accessories, but also simplify the production process, reduce manufacturing costs, and improve overall production efficiency and product consistency.

[0038] Reference Figure 1 and Figure 2The convex ring 13 is fitted onto the outer side of the welding part 12 and is further designed to protrude towards the current collector 1 away from the electrode post 2, thereby forming an effective protective barrier structure during the welding process. During torque welding, the welding head contacts the welding part 12 and generates high-speed friction, which can easily lead to the generation of a small amount of metal debris or particles. The convex ring 13 can effectively block, collect, and limit the movement range of these metal debris generated by friction, preventing debris from splashing into the surrounding area, reducing internal contamination of the battery cell, and reducing the potential short circuits or safety hazards caused by this. Furthermore, the convex ring 13 and the current collector 1 body 11 are integrally molded, making the overall structure more stable and reliable, avoiding problems such as loosening, while ensuring the continuity of the current conduction path, improving conductivity and mechanical strength, thereby significantly improving the reliability of the welded connection and the overall safety performance of the battery cell. Furthermore, the height of the convex ring 13 ranges from 0.2mm to 3mm, the width ranges from 0.2mm to 2mm, and the diameter ranges from 2mm to 8mm.

[0039] After being wound, the core separator forms a uniform cylindrical structure to accommodate the tight arrangement inside the cylindrical battery cell, thereby ensuring effective isolation between the electrode sheets and stable electrochemical reactions. The shape, thickness, and dimensional parameters of the core separator are basically the same as those of the cylindrical battery cell separators used in the prior art, so its specific structure will not be described in detail in this specification. One end of the separator abuts against the side of the current collector 1 away from the electrode post 2, achieving a stable fit and reliable positioning with the current collector 1, thereby ensuring the overall assembly accuracy of the internal components. In this embodiment of the invention, the core separator, the convex ring 13, and the welding part 12 together form a closed or nearly closed spatial structure. This structure can effectively seal the welding area during torque welding, limiting the diffusion of metal debris or particles generated by welding friction and preventing them from entering the electrode layer inside the core. Through this structural design, the risk of metal debris piercing the separator and causing a short circuit between the positive and negative electrodes can be effectively avoided, thereby significantly improving the electrochemical stability and safety of the battery cell. At the same time, the design takes into account both the high efficiency of the torque welding process and the overall stability of the manifold 1 structure, providing a reliable guarantee for subsequent assembly and grouping.

[0040] Reference Figure 1The anti-torsion section is designed as a ring-shaped structure and is fitted around the outer side of the convex ring 13 to form a multi-layered protective system around the torque welding area. This anti-torsion section not only structurally supports and limits the torque welding area but also further enhances the overall torsional resistance and welding stability. Multiple through holes 14 are provided on the anti-torsion section, which are evenly distributed around the convex ring 13 in the circumferential direction, allowing the anti-torsion section to maintain sufficient structural strength while possessing a certain degree of elasticity and deformation buffering capacity. Narrow strip-shaped anti-torsion bridges 15 are formed between adjacent through holes 14, and these anti-torsion bridges 15 are evenly distributed in a ring, thereby achieving overall dispersion of torque force and balanced stress transmission. During torque welding, the welding head contacts and rubs against the welding part 12, and the welding part 12 may undergo slight elastic deformation due to concentrated force. At this point, the anti-torsion bridge 15 can deform moderately according to the direction of force, absorbing and buffering the stress generated during welding. This effectively prevents the local deformation of the welded part 12 from spreading to the main body area of ​​the current collector 1, avoiding warping, cracking, or structural instability caused by uneven stress. Simultaneously, with the synergistic effect of the anti-torsion bridge 15, the amount of metal debris generated during friction and deformation is significantly reduced, effectively lowering the risk of debris splashing into the core diaphragm and electrode layer, further improving the cleanliness, safety, and electrochemical reliability of the battery cell assembly. Through the synergistic design of the anti-torsion part and the anti-torsion bridge 15, the dual functions of stress absorption and debris protection are achieved, ensuring that the current collector 1 maintains excellent structural stability, durability, and long-term reliability while ensuring welding strength and conductivity.

[0041] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A current collector for a cylindrical battery, the cylindrical battery comprising terminals (2), characterized in that, The collector plate includes a welding part (12) and a convex ring (13). The welding part (12) is connected to the pole post (2) by torque welding. The convex ring (13) is disposed outside the welding part (12) and is disposed in the direction away from the pole post (2) of the collector plate (1).

2. The collector disk according to claim 1, characterized in that, The collector plate (1) also includes a body (11), and the convex ring (13) is integrally formed with the body (11).

3. The collector disk according to claim 2, characterized in that, The welded part (12) and the convex ring (13) are integrally formed.

4. The collector disk according to claim 1, characterized in that, The thickness of the manifold (1) ranges from 0.1 mm to 1 mm.

5. The collector disk according to claim 1, characterized in that, The height of the convex ring (13) ranges from 0.2 mm to 3 mm; and / or The width of the convex ring (13) ranges from 0.2 mm to 2 mm; and / or The diameter of the convex ring (13) ranges from 2 mm to 8 mm.

6. The collector disk according to claim 1, characterized in that, The collector plate (1) is provided with multiple through holes (14), which are arranged around the outside of the convex ring (13), and an anti-torsion bridge (15) is formed between two adjacent through holes (14).

7. The collector disk according to claim 6, characterized in that, Multiple anti-torsion bridges (15) are evenly distributed along the outer side of the convex ring (13).

8. The collector disk according to claim 6, characterized in that, The width of the anti-torsion bridge (15) ranges from 0.2 mm to 6 mm; and / or The length of the anti-torsion bridge (15) ranges from 0.2 mm to 6 mm; and / or The number of anti-torsion bridges (15) ranges from 2 to 32.

9. A cylindrical battery, characterized in that, Includes the collector disk (1) as described in any one of claims 1-8.

10. The cylindrical battery according to claim 9, characterized in that, The cylindrical battery also includes a core separator. The electrode post (2) is disposed on the first side of the current collector (1), and the core separator is disposed on the second side of the current collector (1). One end of the core separator abuts against the current collector (1). The core separator, the convex ring (13), and the welding part (12) form a closed space.

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