Pole terminal structure, welding method and application

Abstract

The invention belongs to the technical field of storage batteries, and particularly relates to a pole terminal structure, a welding method and application, the pole terminal structure comprises a terminal body, the terminal body is an integrated long circular flat plate-shaped structure with two semicircular ends and a rectangular middle, one end of the terminal body is provided with a cone-frustum-shaped pole hole, and the other end of the terminal body is provided with a groove; one end of the terminal body is provided with a pole hole, the inner wall of the pole hole inclines towards the central axis to form an annular wedge-shaped structure, the other end of the terminal body vertically extends up and down to form a threaded column and a base, the top end face of the base and the bottom end face of the pole hole are coplanar, and the top end face of the pole hole and the bottom end face of the threaded column are coplanar. The problem that the welding quality cannot be visually detected due to lead liquid covering of an existing cylindrical pole hole is solved, the long-acting acid climbing prevention performance is achieved, the terminal does not need to depend on a complex welding process, the torsion resistance of the terminal is fundamentally improved, and the problem that the terminal and the pole are prone to sliding up and down and loosening is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of storage batteries, and particularly relates to a terminal structure, a welding method and an application thereof. Background Art

[0002] As an important energy device widely used in fields such as automotive starting, backup power supplies, and energy storage systems, the performance stability and safety of lead-acid batteries are directly related to the normal operation and service life of equipment. The terminal, as a key component connecting the positive and negative electrode posts of the lead-acid battery to the external circuit, undertakes the important function of current transmission. However, during the actual production and use process, the welding quality between the terminal and the electrode post directly affects the overall performance and reliability of the battery.

[0003] Currently, the terminal structure generally adopts a simple cylindrical hole with a threaded connection structure. This structure has the following problems during terminal welding: 1. Contact problems caused by poor welding During the battery production process, since the cylindrical electrode post hole of the terminal is completely covered by lead liquid, it is very difficult to visually judge the welding quality, making it difficult to detect defects such as virtual welding and false welding in a timely manner. And such defects are very likely to cause terminal loosening and falling off due to factors such as vibration, thermal expansion and contraction during the battery's transfer to subsequent processes or actual use, resulting in an increase in contact resistance, heating and even open circuit, seriously affecting the battery performance and safety; 2. Insufficient torsional resistance caused by structural defects During the battery use process, especially in scenarios of high-current discharge or frequent disassembly and assembly, the terminal and the electrode post are prone to loosen, resulting in an increase in the resistance of the bonding surface, aggravated heating, and even potential safety hazards such as terminal burnout or fire; 3. Insufficient anti-crawling acid performance During the battery electrode welding process, there will be tiny gaps at the bonding interface between the terminal and the lead coating layer. These gaps will cause the electrolyte to climb along them, resulting in problems such as terminal corrosion and a decrease in insulation performance.

[0004] There are studies on the many problems existing in the current terminal structure in the prior art. For example, in the patent application CN211957779U - A lead - acid battery terminal structure, through the Z - shaped structure design of welding the lead platform and the external conical terminal, although it can enhance the terminal torque and welding efficiency, it is still very difficult to intuitively judge the welding quality. Moreover, its anti - acid - creep design relies on the cooperation of multiple grooves and butyl rubber, which requires a high welding process and is difficult to fundamentally solve the acid - creep problem caused by poor welding. Another example is the patent application CN105118955A - A copper terminal for preventing pole - post loosening and its processing method, which enhances the fusion of the terminal and the lead - covered part through structures such as annular grooves, strip - shaped knurling, and tail bosses, but it is mainly applicable to the connection scenario between copper terminals and lead - covered parts and does not solve the quality problem of the direct welding between the pole - post of the lead - acid battery and the terminal. In addition, the existing copper terminal processing technology is complex, resulting in increased costs, and the improvement effect of the anti - torsion performance is also limited by the welding quality.

[0005] In summary, it is very difficult to intuitively judge the welding quality of the existing battery terminal structure, which makes it difficult to fundamentally solve the acid - creep problem caused by poor welding. In addition, the existing battery terminal structure has a complex processing technology, high cost, and the improvement effect of the anti - torsion performance is extremely limited by the welding quality. Therefore, a new technical solution is needed to solve the above - mentioned technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a pole - post terminal structure, welding method and application to solve the problems mentioned in the above - mentioned background technology, that is, it is very difficult to intuitively judge the welding quality of the current battery terminal structure at the present stage, which makes it difficult to fundamentally solve the acid - creep problem caused by poor welding. In addition, the existing battery terminal structure has a complex processing technology, high cost, and the improvement effect of the anti - torsion performance is extremely limited by the welding quality.

[0007] To achieve the above - mentioned purpose, the present invention provides the following technical solution: A pole - post terminal structure includes a terminal body. The terminal body is an integral oblong flat plate - like structure with semi - circular ends and a rectangular middle part. One end of the terminal body is provided with a conical - frustum - shaped pole - post hole. The inner wall of the pole - post hole inclines towards the central axis to form an annular wedge - shaped structure. The inclination angle of the inner wall of the annular wedge - shaped structure is 15 - 45°. The other end of the terminal body vertically extends upwards and downwards with a threaded post and a base respectively. The central axis of the threaded post is collinear with the central axis of the base, and the diameter of the base is smaller than the diameter of the threaded post. The top surface of the base is coplanar with the bottom surface of the pole - post hole, and the top surface of the pole - post hole is coplanar with the bottom surface of the threaded post. The threaded post is provided with a threaded through - hole penetrating the top end.

[0008] Furthermore, the longitudinal section of the terminal post hole is trapezoidal, and the wall thickness on the side away from the central axis gradually decreases towards the inside of the hole; the cross section of the terminal post hole is circular ring-shaped; the wall thickness on the side of the terminal post hole away from the central axis in the radial direction is greater than the wall thickness on the side close to the central axis.

[0009] Furthermore, on the outer circumference of the terminal post hole, there are tail fins extending horizontally. The thickness of the tail fins is equal to the wall thickness on the side of the terminal post hole away from the central axis in the radial direction.

[0010] Weld the terminal post structure arranged as above to the terminal post of the storage battery. The specific steps are as follows: S1. Position the terminal post structure arranged as above at the position of the terminal post on the top of the storage battery through the base and the tail fins. S2. Use an electric soldering iron and solder wire to melt part of the terminal post on the top of the storage battery into lead liquid. The melted lead liquid overflows and covers the terminal post hole of the terminal post structure. S3. After the lead liquid cools and solidifies naturally, it interlocks with the annular wedge-shaped structure of the terminal post hole to form a dumbbell-shaped bayonet structure with a larger diameter at both ends than in the middle, thus completing the welding of the storage battery terminal post.

[0011] In addition to the above technical solutions, the terminal post structure arranged as above can also be applied to the electrode connection of lead-acid storage batteries.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention adopts a pole hole in the shape of a frustum of a cone with an inner wall inclined towards the central axis to form an annular wedge-shaped structure, so that the pole hole forms a dumbbell-shaped bayonet structure with diameters at both ends larger than the middle diameter after welding, realizing the physical interlocking effect between the terminal body and the pole, enabling the welding quality to be visually judged through the integrity of the bayonet structure, completely solving the problem that the welding quality of the existing cylindrical pole hole cannot be visually detected due to the coverage of lead liquid, avoiding problems such as terminal loosening and falling off caused by vibration, thermal expansion and contraction of virtual soldering, false soldering and other defects in subsequent processes or use, ensuring the firmness of the welding of the terminal structure, eliminating problems such as increased contact resistance, heating and even open circuit caused by poor welding, fundamentally improving the long-term reliability of the battery, thus significantly improving the safety and service life of the battery. On this basis, seamless bonding can be formed by using the lead liquid and the annular wedge-shaped structure of the pole hole, completely eliminating the tiny gap between the terminal and the pole, fundamentally blocking the path of the electrolyte climbing along the bonding interface, avoiding problems such as terminal corrosion and deterioration of insulation performance, and realizing long-term anti-acid-climbing performance without relying on additional sealing materials. Through the cooperation of the pole hole with the annular wedge-shaped structure and the vertical extension structure of the threaded post and the base, a three-dimensional anti-torsion system is constructed. When the battery discharges at a large current or is frequently disassembled and assembled, the contact surface between the terminal and the pole not only bears the axial tension, but also converts the torque into radial pressure through the inclined surface of the annular wedge-shaped structure, fundamentally improving the anti-torsion performance of the terminal, and without relying on complex welding processes, solving the problem of easy up-and-down sliding loosening between the terminal and the pole, avoiding risks such as increased resistance and heating at the bonding surface, and reducing the risk of terminal burning or fire. The terminal body adopts an oblong flat plate-shaped structure with semicircles at both ends and a rectangle in the middle. While ensuring mechanical strength, it realizes lightweight design by optimizing material distribution, further reducing the material consumption, directly reducing the raw material cost, and at the same time improving the universality and interchangeability of the product, which is beneficial to large-scale production and market promotion; 2. By carefully designing the inclination angle of the inner wall of the annular wedge-shaped structure, the molten lead can more evenly fill the gap between the terminal post hole and the terminal post during welding, so that the bonding surface formed by the terminal structure and the terminal post has a better mechanical biting effect, making the connection between the terminal and the terminal post more firm, effectively improving the welding bonding strength, reducing the risks such as increased contact resistance, heating, and even open circuit caused by poor welding. At the same time, the torque can be more effectively dispersed and transmitted through the inclined contact surface, enhancing the anti-torsion ability of the terminal. On this basis, by utilizing the characteristics of the trapezoidal longitudinal section combined with the decreasing wall thickness, the molten lead can flow more smoothly and fill the terminal post hole during welding, so that the lead can better form a tight bond with the terminal post when solidifying, reducing the generation of welding defects, improving the reliability of welding, helping to visually judge the welding quality, avoiding subsequent problems caused by poor welding, better adapting to stress changes caused by factors such as thermal expansion and contraction, reducing the risk of structural damage caused by stress concentration, and extending the service life of the terminal; 3. The present invention adopts a terminal post hole with a circular ring cross-section, making the current transmission between the terminal and the terminal post more uniform, so that the current is more reasonably distributed on the circular ring cross-section, reducing the heating problem caused by excessive local current, improving the performance and safety of the battery. On this basis, by utilizing the design feature of unequal wall thickness, the structural stability of the terminal post hole is enhanced, reducing the influence of welding deformation on the terminal structure when the terminal bears external forces and internal current, being beneficial to ensuring the welding quality, improving the overall strength and reliability of the terminal. Through the design of horizontally extending tail fins on the outer circumference of the terminal post hole, a positioning reference is provided for the terminal during welding, enabling the terminal to be more accurately installed on the terminal post, improving the positioning accuracy, and at the same time increasing the contact area between the terminal and the terminal post, helping the heat to be more evenly transmitted during welding, improving the welding quality, and ensuring a good connection between the terminal and the terminal post; 4. Through the coaxial design of the center axes of the base and the threaded post and the design of size differences, the terminal is not easily deformed and damaged when bearing various acting forces, improving the reliability and service life of the terminal. From the perspective of processing and manufacturing, the structure is effectively simplified, the processing cost and difficulty are reduced, which is beneficial to large-scale production; 5. The present invention accurately positions the pole terminal structure at the pole position inside the battery through the base and the tail fin, ensuring the accuracy of the welding position, effectively avoiding poor welding caused by positioning deviation, such as false soldering and offset soldering, significantly improving the welding quality, enabling a more reliable electrical connection between the pole terminal and the battery pole. Then, using the high temperature of the soldering iron to melt part of the pole into lead liquid and covering the pole hole with solder wire can not only ensure the good fluidity of the lead liquid but also minimize the thermal impact on surrounding components to the greatest extent, ensuring the stability and reliability of the welding process. At the same time, it can also ensure the electrical conductivity of the pole. On this basis, through natural cooling, without additional processing or treatment steps, the structure is simple and stable, capable of maintaining a good connection state for a long time, reducing the risk of failure caused by structural deformation or damage, lowering the maintenance cost of the battery, and also enabling the lead liquid to interlock with the annular wedge-shaped structure of the pole hole after solidification, forming a dumbbell-shaped bayonet structure with a larger diameter at both ends than in the middle, greatly enhancing the connection strength between the pole terminal and the pole. Compared with the existing welding methods, it can better withstand various stresses and vibrations generated during the use of the battery, effectively preventing the pole terminal from loosening or falling off, and improving the service life and safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the overall structure of the pole terminal of the present invention; Figure 2 is Figure 1 a schematic diagram of the structure with the threaded post and the base removed in Figure 3 is Figure 1 or Figure 2 a schematic diagram of the structure of the pole hole in Figure 4 is Figure 2 a schematic diagram of the longitudinal sectional structure of part of the pole hole in (including the tail fin); Figure 5 is a schematic diagram of the threaded post and the base of the present invention.

[0014] Among them, 1, terminal body; 2, pole hole; 3, tail fin; 4, threaded post; 401, threaded through hole; 5, base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following embodiments are used to further illustrate the content of the present invention and do not limit the application of the present invention. Embodiment 1:

[0016] Please refer to Figures 1-5, in this embodiment, a terminal post structure is provided, including a terminal body 1. The terminal body 1 is an integrally formed oblong flat plate structure with semi-circular ends and a rectangular middle part. One end of the terminal body 1 is provided with a conical terminal post hole 2. The inner wall of the terminal post hole 2 inclines towards the central axis to form an annular wedge-shaped structure. The inclination angle of the inner wall of the annular wedge-shaped structure is 15°. The longitudinal section of the terminal post hole 2 of the annular wedge-shaped structure is trapezoidal, and the wall thickness on the side far from the central axis gradually decreases towards the inside of the hole. The cross-section of the terminal post hole 2 is circular ring-shaped, and the wall thickness on the side far from the central axis in the radial direction is greater than that on the side close to the central axis. Horizontally extending circumferentially outside the terminal post hole 2 is a tail wing 3 with a thickness equal to the wall thickness of the terminal post hole 2 on the side far from the central axis in the radial direction. The other end of the terminal body 1 vertically extends upwards with a threaded post 4. The threaded post 4 is provided with a threaded through hole 401 penetrating the top end for connecting other components. The other end of the terminal body 1 vertically extends downwards with a base 5. The central axis of the base 5 is collinear with the central axis of the threaded post 4, and the diameter of the threaded post 4 is greater than the diameter of the base 5. The top end surface of the base 5 is coplanar with the bottom end surface of the terminal post hole 2, and the top end surface of the terminal post hole 2 is coplanar with the bottom end surface of the threaded post 4.

[0017] Weld the above-mentioned terminal post structure to the terminal post of the storage battery (the functions and structures of conventional devices such as the storage battery and its terminal post are well-known in the art, and the connection settings are also common knowledge, so no more description will be given here and they are not shown in the drawings). The specific steps are as follows: First, position the terminal body 1 at the position of the terminal post inside the storage battery through the base 5 and the tail wing 3. Then, use the high temperature of the soldering iron to melt part of the terminal post at the top of the storage battery into lead liquid mixed with solder wire liquid. The melted lead liquid will overflow and cover the terminal post hole 2 with an inner wall inclination angle of 15° of the annular wedge-shaped structure. Finally, the lead liquid will gradually shrink and solidify under natural cooling until it forms solid lead (at this time, the solid lead is a lead connecting piece and is mixed with the solder wire to form a conductive connecting piece). The solid lead will interlock with the annular wedge-shaped structure of the terminal post hole during the shrinkage and solidification process of the lead liquid, and finally form a dumbbell-shaped bayonet structure with a larger diameter at both ends than in the middle, that is, the welding of the storage battery terminal post is completed. At this time, the welding bonding strength between the terminal and the terminal post is 104 MPa.

[0018] Then apply the above-mentioned terminal post structure to the electrode connection of the lead-acid storage battery. Embodiment 2:

[0019] Please refer to Figures 1-5, in this embodiment, the specific setting, welding method and application of the pole terminal structure are the same as those in Embodiment 1, except that the inner wall inclination angle of the annular wedge-shaped structure is different, that is: the inner wall inclination angle of the annular wedge-shaped structure is 45°. During the welding process, the high temperature of the soldering iron is used to melt part of the pole on the top of the battery into lead liquid mixed with solder wire liquid. The melted lead liquid will overflow and cover the pole hole 2 with an inner wall inclination angle of 45° of the annular wedge-shaped structure. At this time, the welding bonding strength between the terminal and the pole is 120 MPa. Embodiment 3:

[0020] Please refer to Figures 1-5 , in this embodiment, the specific setting, welding method and application of the pole terminal structure are the same as those in Embodiment 1, except that the inner wall inclination angle of the annular wedge-shaped structure is different, that is: the inner wall inclination angle of the annular wedge-shaped structure is 30°. During the welding process, the high temperature of the soldering iron is used to melt part of the pole on the top of the battery into lead liquid mixed with solder wire liquid. The melted lead liquid will overflow and cover the pole hole 2 with an inner wall inclination angle of 30° of the annular wedge-shaped structure. At this time, the welding bonding strength between the terminal and the pole is 116 MPa.

Claims

1. A terminal structure of a pole column, comprising a terminal body, characterized in that, The terminal body is an integral oblong flat plate structure with semi-circular ends and a rectangular middle. One end of the terminal body is provided with a conical post hole, and the inner wall of the post hole inclines towards the central axis to form an annular wedge-shaped structure. The other end of the terminal body vertically extends upwards and downwards with a threaded post and a base respectively. The top surface of the base is coplanar with the bottom surface of the post hole, and the top surface of the post hole is coplanar with the bottom surface of the threaded post.

2. The pole terminal structure according to claim 1, characterized in that, The inclination angle of the inner wall of the annular wedge-shaped structure is 15 - 45°.

3. The pole terminal structure according to claim 2, characterized in that, The longitudinal section of the post hole is trapezoidal and the wall thickness on the side away from the central axis gradually decreases towards the inside of the hole.

4. A terminal structure of a pole according to claim 3, characterized in that, The cross section of the post hole is circular ring-shaped.

5. The pole terminal structure according to claim 4, characterized in that, The wall thickness of the post hole on the side away from the central axis in the radial direction is greater than the wall thickness on the side close to the central axis.

6. The pole terminal structure according to claim 5, characterized in that, The outer circumference of the post hole horizontally extends with a tail fin, and the thickness of the tail fin is equal to the wall thickness of the post hole on the side away from the central axis in the radial direction.

7. The pole terminal structure according to claim 1, characterized in that, The threaded post is provided with a threaded through hole penetrating the top end.

8. The pole terminal structure according to claim 7, characterized in that, The central axis of the threaded post is collinear with the central axis of the base, and the diameter of the base is smaller than the diameter of the threaded post.

9. A welding method for a battery pole terminal structure, characterized in that, It includes the following specific steps: S1. Position the post terminal structure according to any one of claims 1 - 8 at the post position on the top of the storage battery through the base and the tail fin. S2. Use an electric soldering iron and solder wire to melt a part of the post on the top of the storage battery into lead liquid, and the melted lead liquid overflows and covers the post hole of the post terminal structure. S3. After the lead liquid naturally cools and solidifies, it interlocks with the annular wedge-shaped structure of the post hole to form a dumbbell-shaped bayonet structure with a larger diameter at both ends and a smaller diameter in the middle, that is, the welding of the storage battery post terminal is completed.

10. An application of the post terminal structure according to any one of claims 1 - 8 in the electrode connection of lead-acid storage batteries.

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