Pole column for parallel connection of unit cells in battery

Abstract

The utility model provides a pole column for parallel connection of single cells in a battery, which is arranged on a busbar of each single cell lead-acid battery and comprises a conical boss, and a connecting line of a top surface central point and a bottom surface central point of the conical boss coincides with a bottom surface vertical central line of the conical boss. The diameter of the cross section of the conical boss in the horizontal direction is gradually increased from top to bottom; a circular boss is arranged on the lower portion of the conical boss, the outer circumferential face of the circular boss extends out of the conical boss, and a conductive soft metal strip is fixedly arranged on the outer side of the conical boss. The single-cell lead-acid battery pole is simple and reasonable in structure and strong in integrity, a plurality of single-cell lead-acid batteries can be connected in parallel to form a single-cell lead-acid battery through the pole, the voltage stability of the lead-acid battery can be ensured, the battery reliability is improved, the internal resistance of the battery can be reduced, higher current output can be supported, the overall performance of the lead-acid battery is improved, and the service life of the lead-acid battery is prolonged. And the structure is simple, installation is easy, maintenance is convenient, and applicability is wide.

Description

Technical Field

[0001] This utility model relates to the field of lead-acid battery technology; specifically, it relates to a terminal post for parallel connection of individual cells inside a battery. Background Technology

[0002] Lead-acid batteries (VRLA) are a type of storage battery primarily made of lead and its oxides as electrodes, with sulfuric acid solution as the electrolyte. The nominal voltage of a single lead-acid cell is 2.0V. A 2.0V lead-acid battery can discharge to 1.5V and charge to 2.4V. In engineering applications, multiple single lead-acid cells are often connected in series to form lead-acid batteries with nominal voltages of 12V, 24V, 36V, and 48V.

[0003] Currently, larger capacity 2.0V lead-acid batteries (such as 2V 800Ah and above) are composed of two or four individual lead-acid cells, completely isolated from each other. This results in poor overall voltage stability due to performance differences between the individual cells. When any one cell fails, the overall battery voltage drops, potentially causing the entire battery to fail.

[0004] If a 2.0V lead-acid battery is made into a single cell to avoid performance differences between multiple cells, this would result in a larger number of plates in a single cell, making it heavier and more difficult to assemble. Utility Model Content

[0005] Therefore, the purpose of this utility model is to design a terminal for parallel connection of single cells inside a battery. Through this terminal, multiple single lead-acid batteries can be connected in parallel to form a single lead-acid battery cell. This not only ensures the voltage stability of the lead-acid battery and improves the battery reliability, but also reduces the internal resistance of the battery, supports higher current output, improves the overall performance of the lead-acid battery, and has a simple structure, is easy to install, is easy to maintain, and has wide applicability.

[0006] This utility model provides a terminal post for parallel connection of individual cells inside a battery, which is set on the busbar of each lead-acid battery cell, including: a conical boss, wherein the line connecting the center point of the top surface and the center point of the bottom surface of the conical boss coincides with the vertical center line of the bottom surface of the conical boss, and the horizontal cross-sectional diameter of the conical boss gradually increases from top to bottom; a circular boss is provided at the lower part of the conical boss, the outer circumference of the circular boss extends beyond the conical boss, and a conductive soft metal strip (preferably a lead strip) is fixedly provided on the outer side of the conical boss.

[0007] Specifically, the busbar connects multiple positive and negative plates to form a single-cell lead-acid battery pack. Preferably, the terminals are welded to the busbar. Welding the terminals plays a crucial role in connecting multiple single-cell lead-acid batteries. This robust connection enhances the stability of the terminals during use and provides safety for the battery. Furthermore, welding the terminals to the busbar helps improve the battery's sealing performance. The tight fit between the terminals and the busbar effectively suppresses acid mist leakage through gaps, prevents electrolyte leakage, and slows down terminal oxidation and acid creep, thereby improving the overall battery sealing and environmental tolerance.

[0008] The upper part of the electrode post adopts a conical boss (frustum structure) that is thinner at the top and thicker at the bottom. Preferably, the taper of the conical boss is designed to be 1:1.5-1:2. The middle part of the electrode post is a circular boss with an outer circumference diameter larger than that of the upper conical boss. The upper conical boss allows a conductive soft metal strip (such as a lead strip) to be smoothly inserted into the electrode post, while the middle circular boss can hold the conductive soft metal strip in place from above and below, preventing it from falling directly from the electrode post onto the busbar.

[0009] Specifically, the electrode post is made of lead.

[0010] Furthermore, the lower part of the circular boss is provided with a cylinder whose outer circumference diameter is smaller than that of the circular boss, the lower part of the cylinder is provided with a foot, the line connecting the center of the top surface and the center of the bottom surface of the cylinder is perpendicular to the top or bottom surface of the cylinder, and the foot is embedded in the busbar.

[0011] The base increases the contact area with the busbar, improves the structural installation stability of the pole, and also enables the pole to carry a larger current.

[0012] Preferably, the outer circumferential diameter of the cylinder is slightly larger than the bottom diameter of the conical boss (e.g., the outer circumferential diameter of the cylinder is φ25mm and the bottom diameter of the conical boss is φ23mm), so that the diameter of the lead strip clamping point on the pole is larger than the bottom diameter of the conical boss, thereby ensuring the overall structural strength of the pole and facilitating mold forming, avoiding excessive stress deformation of the pole body during processing.

[0013] The line connecting the center of the top surface and the center of the bottom surface of the cylinder is perpendicular to the top or bottom surface of the cylinder, that is, the cylinder is a straight cylinder. The straight cylinder structure can evenly distribute external and internal pressure, making the force more balanced. It is not easy to deform when subjected to external pressure and has good stability.

[0014] Furthermore, the upper and lower end faces of the base are dovetail-shaped structures, the narrow side edge of the dovetail-shaped structure is tangent to the lower outer circular surface of the cylinder, and the wide side edge of the dovetail-shaped structure is parallel to the central axis of the cylinder.

[0015] The base adopts a dovetail structure. This dovetail structure, with its trapezoidal tail design, provides high-strength corner engagement, effectively preventing detachment under stress and ensuring the stability of the connection between the terminal and the busbar. Due to the large contact area of ​​the dovetail structure and its ability to effectively distribute loads under stress, it possesses high load-bearing capacity. Whether subjected to vertical pressure or horizontal cutting forces, the dovetail structure can stably withstand these loads. The dovetail design also results in a lower profile for the terminal, allowing for more efficient use of limited space in space-constrained lead-acid batteries while maintaining high rigidity and stability.

[0016] The narrow side edge of the dovetail structure is tangent to the lower outer circular surface of cylinder 3, which facilitates mold opening and mold demolding, while avoiding stress concentration in small areas due to non-tangency; the wide side edge is parallel to the central axis of the cylinder, which facilitates the mounting of the base on the busbar.

[0017] Furthermore, a conductive soft metal strip is connected between the two terminals located on two adjacent lead-acid battery cells. The two ends of the conductive soft metal strip are circular ring structures, and the conical protrusion passes through the inner hole of the circular ring structure.

[0018] Two adjacent lead-acid battery cells are connected in parallel by a conductive soft metal strip. The ring-shaped structure reduces the contact resistance between the terminals and the conductive soft metal strip, optimizes current conduction efficiency, and ensures more stable current output. This close contact method can maintain the reliability of the conductive interface even in environments with frequent vibration (such as forklift operation), avoiding the risk of increased resistance or open circuit due to loosening.

[0019] Furthermore, the top surface of the conical boss is flush with the top surface of the annular structure.

[0020] The top surface of the terminal post is flush with the top surfaces of both ends of the conductive soft metal strip (lead strip), reducing the concentration points of mechanical stress caused by the height difference. This makes the connection between the terminal post and the conductive soft metal strip less prone to loosening or breakage under vibration or impact. Especially for rigid connection technology such as lead strip snap-fit, it can significantly improve the overall mechanical strength of the battery pack and extend its service life.

[0021] Furthermore, the annular structure is welded to the conical boss as a single unit.

[0022] Compared to traditional flexible connections, which require frequent checks for loose screws, welding, a rigid connection method, reduces the frequency of daily maintenance and lowers maintenance costs. Although replacing each individual conductive soft metal strip or electrode requires specialized welding, the long-term stability and anti-aging capabilities of the rigid connection structure reduce sudden failures caused by poor contact and lower the likelihood of breakage or deformation under external impact.

[0023] Furthermore, the weld bead height at the weld joint between the annular structure and the conical boss is flush with the top surface of either the annular structure or the conical boss.

[0024] If the weld bead is below or above the top surface of a circular structure or conical boss (i.e., overflowing the top surface), it will affect the stress concentration and the size of the stress-applied area, thus affecting the mechanical properties of the weld. If the weld bead height is flush with the top surface of the circular structure or conical boss, the weld surface will be smooth, thereby reducing stress concentration and the size of the stress-applied area, and improving the mechanical properties of the weld.

[0025] Furthermore, the middle part of the conductive soft metal strip is an elongated structure, and the top surface of the elongated structure is located below the top surface of the annular structure.

[0026] The elongated structure is thinner than the ring-shaped structure, allowing for better utilization of the conductive soft metal strip (lead strip) material and reducing unnecessary waste. It also reduces the weight of the conductive soft metal strip (lead strip), thus lowering the overall weight of lead-acid batteries using multiple terminals and multiple conductive soft metal strips.

[0027] Preferably, the vertical thickness of the elongated structure is half the vertical height of the annular structure.

[0028] Furthermore, multiple poles are provided on each busbar, and the multiple poles are evenly distributed at equal intervals.

[0029] The equal spacing of multiple terminals on the busbar optimizes battery performance. Uneven spacing, where the positive and negative plates are too close or too far apart, can affect key performance indicators such as battery capacity and charge / discharge efficiency. This can damage not only the battery itself but also the devices using it. By setting equal spacing between the positive and negative terminals, the distance between them is kept within a safe range, reducing the risk of short circuits. Furthermore, the equal spacing design ensures that the battery exhibits optimal performance during use.

[0030] The evenly spaced spacing makes assembly, maintenance, and repair more convenient. During assembly and maintenance, technicians can more easily access each terminal to perform necessary inspections and maintenance, thereby improving work efficiency and accuracy.

[0031] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0032] The terminal structure for parallel connection of individual lead-acid cells inside a battery provided by this utility model is simple and reasonable, with strong overall integrity. Through this terminal, multiple individual lead-acid cells can be connected in parallel to form a single lead-acid cell. This not only ensures the voltage stability of the lead-acid battery and improves the battery reliability, but also reduces the battery's internal resistance, supports higher current output, and improves the overall performance of the lead-acid battery. Furthermore, it has a simple structure, is easy to install and maintain, has wide applicability, and has broad prospects for promotion and application. Attached Figure Description

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0034] Figure 1 This is a structural diagram of the pole post according to an embodiment of the present utility model;

[0035] Figure 2 This is an installation diagram of multiple terminals inside the battery according to an embodiment of the present invention.

[0036] The markings in the attached figure are as follows:

[0037] 1. Conical boss, 2. Circular boss, 3. Cylinder, 4. Foot, 5. Lead strip, 51. Circular ring structure. Detailed Implementation

[0038] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, embodiments and features of the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] In the description of this utility model, it should be noted that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to 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.

[0040] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. 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; it can be a connection within 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.

[0041] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings:

[0042] Example

[0043] This utility model embodiment provides a lead-based terminal post for parallel connection of individual cells within a battery. This terminal post is disposed on the busbar of each individual lead-acid battery cell. Figure 2 As shown, multiple evenly spaced terminals are welded onto each busbar. This welding method enhances the stability of the terminals during use, providing a safety guarantee for the lead-acid battery. The equal spacing of the multiple terminals on the busbar optimizes battery performance. By setting equal distances between the positive and negative terminals, the distance between them is kept within a safe range, reducing the risk of short circuits. Furthermore, the equal spacing of the terminals facilitates assembly, maintenance, and repair, improving work efficiency and accuracy, and ensuring the battery exhibits optimal performance during use. Figure 1As shown, each pole includes a conical boss 1. The line connecting the center point of the top surface and the center point of the bottom surface of the conical boss 1 coincides with the vertical center line of the bottom surface of the conical boss 1. The horizontal cross-sectional diameter of the conical boss 1 gradually increases from top to bottom. A circular boss 2 is provided at the lower part of the conical boss 1, and the outer circumference of the circular boss 2 extends beyond the conical boss 1. The upper part of the pole adopts a conical boss 1 with a tapered structure that is thinner at the top and thicker at the bottom. The taper of the conical boss is designed to be 1:1.8. The middle part of the pole is a circular boss 2 with an outer circumference diameter larger than that of the upper conical boss 1. The lead strip 5 can be smoothly inserted into the pole through the upper conical boss 1, and the lead strip 5 can be held in place from above and below by the middle circular boss 2, preventing the lead strip 5 from falling directly from the pole onto the busbar. Then, the lead strip 5 is welded to the outside of the conical boss 1. The lower part of the circular boss 2 is provided with a cylinder 3 whose outer circumference diameter is smaller than that of the circular boss 2. The outer circumference diameter of the cylinder 3 is slightly larger than the bottom diameter of the conical boss 1. In this embodiment, the outer circumference diameter of the cylinder 3 is φ25mm, and the bottom diameter of the conical boss 1 is φ23mm. This ensures that the diameter of the lead strip 5 on the pole post is larger than the bottom diameter of the conical boss 1, thus guaranteeing the overall structural strength of the pole post and facilitating mold demolding, avoiding excessive stress deformation of the pole post body during processing. The line connecting the center of the top surface and the center of the bottom surface of the cylinder 3 is perpendicular to the top or bottom surface of the cylinder 3. The cylinder 3 is a straight cylinder. The straight cylinder structure evenly distributes external and internal pressure, making the force more balanced. It is not easily deformed when subjected to external pressure and has good stability.

[0044] A base 4 is provided at the bottom of the cylinder 3. The line connecting the center of the top surface and the center of the bottom surface of the cylinder 3 is perpendicular to either the top or bottom surface of the cylinder 3. The base 4 is embedded in the busbar. The base 4 increases the contact area with the busbar, improves the structural installation stability of the pole, and also enables the pole to carry a larger current. The upper and lower end faces of the base 4 have a dovetail shape (e.g., ...). Figure 1 As shown, the dovetail structure, with its trapezoidal tail design, possesses high-strength corner joint capability, preventing detachment under stress and ensuring the stability of the connection between the terminal and the busbar. The dovetail structure has a large contact area and effectively distributes loads under stress, resulting in high load-bearing capacity. It can stably withstand loads such as vertical pressure and horizontal cutting forces. The narrow side edge of the dovetail structure is tangent to the lower outer surface of the cylinder 3, facilitating mold opening and demolding while avoiding stress concentration in small areas due to non-tangency. The wide side edge of the dovetail structure is parallel to the central axis of the cylinder 3, facilitating the embedding of the base 4 into the busbar. The dovetail design gives the terminal a lower profile, making more efficient use of limited space for lead-acid batteries while maintaining high rigidity and stability.

[0045] A lead strip 5 connects the two terminals on two adjacent lead-acid battery cells. The two ends of the lead strip 5 are circular ring structures 51, with a conical boss 1 passing through the inner hole of the circular ring structure 51. The lead strip 5 connects the two adjacent lead-acid battery cells in parallel. The circular ring structure 51 reduces the contact resistance between the terminal and the lead strip 5, optimizes current conduction efficiency, ensures more stable current output, and maintains the reliability of the conductive interface even in environments with frequent vibration, avoiding the risk of increased resistance or open circuit due to loosening. The circular ring structure 51 and the conical boss 1 are welded together. Compared to traditional soft connections that require frequent checks for loose screws, welding reduces the frequency of daily maintenance and lowers maintenance costs. Although replacing each conductive soft metal strip or terminal requires professional welding, the long-term stability and anti-aging ability of the rigid connection structure reduce sudden failures caused by poor contact and lower the possibility of breakage or deformation under external impact. The top surface of the conical boss 1 is flush with the top surface of the circular ring structure 51. The top surface of the terminal post is flush with the top surfaces of both ends of the lead strip 5, reducing the concentration points of mechanical stress caused by height differences. This makes the connection between the terminal post and the lead strip 5 less prone to loosening or breakage under vibration or impact, thus improving the overall mechanical strength of the battery pack. The weld bead height at the weld between the annular structure 51 and the conical boss 1 is flush with the top surface of the annular structure 51 or the conical boss 1. This flush weld bead height results in a smooth weld surface, reduces stress concentration and the size of the stress-bearing area, and improves the mechanical properties of the weld.

[0046] The lead strip 5 has a long, narrow structure in the middle, with its top surface located below the top surface of the annular structure 51. The elongated structure has a thickness of 10mm in the vertical direction, while the annular structure 51 has a height of 20mm in the vertical direction. The thickness of the elongated structure is less than the height of the annular structure, making better use of the lead strip 5 material and reducing unnecessary waste. This also reduces the weight of the lead strip 5 and the overall weight of the lead-acid battery, which uses multiple terminals and multiple conductive soft metal strips.

[0047] The terminal structure for parallel connection of individual cells within the battery in this embodiment is simple and reasonable, with strong overall integrity. Multiple individual lead-acid cells can be connected in parallel to form a single lead-acid cell through this terminal, which not only ensures the voltage stability of the lead-acid battery and improves battery reliability, but also reduces the internal resistance of the battery, supports higher current output, and improves the overall performance of the lead-acid battery. Furthermore, it has a simple structure, is easy to install and maintain, and has wide applicability.

[0048] The technical solution of this utility model has been described above with reference to 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.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A terminal post for parallel connection of individual cells inside a battery, characterized in that, The busbar of each lead-acid battery cell includes: a conical boss, wherein the line connecting the center point of the top surface and the center point of the bottom surface of the conical boss coincides with the vertical center line of the bottom surface of the conical boss, and the horizontal cross-sectional diameter of the conical boss gradually increases from top to bottom; a circular boss is provided at the lower part of the conical boss, the outer circumference of the circular boss extends beyond the conical boss, and a conductive soft metal strip is fixedly provided on the outer side of the conical boss.

2. The terminal post for parallel connection of individual cells inside a battery according to claim 1, characterized in that, The lower part of the circular boss is provided with a cylinder whose outer circumference diameter is smaller than that of the circular boss. The lower part of the cylinder is provided with a foot. The line connecting the center of the top surface and the center of the bottom surface of the cylinder is perpendicular to the top or bottom surface of the cylinder. The foot is embedded in the busbar.

3. The terminal post for parallel connection of individual cells inside a battery according to claim 2, characterized in that, The upper and lower end faces of the base are dovetail-shaped structures. The narrow side edge of the dovetail-shaped structure is tangent to the lower outer circular surface of the cylinder, and the wide side edge of the dovetail-shaped structure is parallel to the central axis of the cylinder.

4. The terminal post for parallel connection of individual cells inside a battery according to claim 1, characterized in that, A conductive soft metal strip is connected between the two terminals located on two adjacent lead-acid battery cells. The two ends of the conductive soft metal strip are circular ring structures, and the conical boss is inserted into the inner hole of the circular ring structure.

5. The terminal post for parallel connection of individual cells inside a battery according to claim 4, characterized in that, The top surface of the conical boss is flush with the top surface of the annular structure.

6. The terminal post for parallel connection of individual cells inside a battery according to claim 4, characterized in that, The annular structure is welded to the conical boss as a single unit.

7. The terminal post for parallel connection of individual cells inside a battery according to claim 6, characterized in that, The weld bead height at the weld between the annular structure and the conical boss is flush with the top surface of either the annular structure or the conical boss.

8. The terminal post for parallel connection of individual cells inside a battery according to claim 4, characterized in that, The conductive soft metal strip has a long strip-shaped structure in the middle, and the top surface of the long strip-shaped structure is located below the top surface of the annular structure.

9. The terminal post for parallel connection of individual cells inside a battery according to claim 1, characterized in that, Multiple poles are provided on each busbar, and the multiple poles are evenly distributed at equal intervals.

Images