Collector plate welding printing structure and cylindrical secondary battery

Abstract

The utility model provides a collector plate solder print structure and a cylindrical secondary battery, the collector plate solder print structure comprises a collector plate and a solder print, the cross section of the collector plate is circular, and the center of the collector plate is provided with a liquid injection hole; the welding marks are arranged on the surface of the current collecting disc and extend in the radial direction of the current collecting disc; the shortest distance between the welding mark and the edge of the liquid injection hole is W1, the radius of the flow collecting disc is R0, and the ratio of W1 to R0 ranges from 5% to 15%; according to the structure, by setting the specific proportional relation between the shortest distance between the welding mark and the edge of the liquid injection hole and the radius of the collector plate, it is ensured that the welding mark and the hole opening position in the collector plate are kept within the reasonable distance range, the flow guide path is effectively shortened, the internal resistance is reduced, and the overflowing uniformity is improved; and heating concentration and process preparation difficulty in the welding process are avoided, so that the performance and the service life of the battery cell are improved.

Description

Technical Field

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

[0002] A cylindrical battery is a type of battery composed of components such as a positive electrode, a negative electrode, a separator, an electrolyte, and a casing, and its overall shape is cylindrical. Its structure typically includes components such as a casing, a cap, a positive electrode, a negative electrode, a separator, an electrolyte, a PTC element, gaskets, and a safety valve; these components work together to ensure that the battery can charge and discharge normally and provide protection in abnormal conditions.

[0003] A cylindrical battery and battery pack, disclosed in announcement number CN218498308U, comprises a casing, a cell, and a current collector. Both the cell and the current collector are disposed inside the casing. The current collector is welded to the cell to form a solder joint, which protrudes towards the central axis of the current collector. However, the positional relationship of the solder joint assembly is not entirely reasonable, resulting in a long current-conducting path, which can easily lead to high internal resistance and uneven current flow. Furthermore, the weld connection strength needs further improvement.

[0004] Currently, the distance between the solder mark and the opening on the current collector is not set properly in the current collector soldering structure. If the distance between the solder mark and the edge of the opening is too large, the current guiding path will be longer, resulting in higher internal resistance, uneven current flow, and insufficient weld connection strength. Conversely, if the distance is too small, it may cause concentrated heat generation during the welding process, resulting in excessive rate temperature rise. At the same time, the process preparation will become more difficult, and the solder line may easily deviate from the solderable area of ​​the current collector. In addition, it may still cause insufficient weld connection strength, thereby reducing the production quality of the battery. Utility Model Content

[0005] In view of this, this utility model proposes a current collector plate soldering structure and a cylindrical secondary battery. By setting a specific proportional relationship between the shortest distance between the soldering plate and the edge of the injection hole and the radius of the current collector plate, it ensures that the soldering plate and the opening position on the current collector plate are kept within a reasonable distance range, effectively shortening the flow path, reducing internal resistance, improving the uniformity of current flow, and avoiding concentrated heat generation and difficult process preparation during the soldering process, thereby improving the performance and life of the battery cell.

[0006] The technical solution of this utility model is implemented as follows: Firstly, this utility model provides a manifold soldering structure, comprising a manifold and soldering, wherein...

[0007] The cross-sectional shape of the manifold is circular, and an injection hole is provided at the center;

[0008] The solder stamp is set on the surface of the manifold, and the solder stamp extends along the radial direction of the manifold;

[0009] The shortest distance between the solder mark and the edge of the injection hole is W1, and the radius of the manifold is R0, where the ratio of W1 / R0 ranges from 5% to 15%.

[0010] Based on the above technical solutions, preferably, the shortest distance between the solder mark and the outer edge of the manifold is W3, where W3 / R0 = 5%-15%.

[0011] Based on the above technical solutions, preferably, the manifold is also provided with an exhaust hole, which is located on one side of the injection hole and close to the solder mark. The shortest distance between the solder mark and the edge of the exhaust hole is W4, wherein the ratio of W4 / R0 is in the range of 7%-17%.

[0012] Based on the above technical solutions, preferably, the length of the solder mark is W2, wherein the ratio of W2 / R0 ranges from 48% to 62%.

[0013] Based on the above technical solutions, preferably, the width of the solder mark is W5, wherein the ratio of W5 / R0 is in the range of 20%-30%.

[0014] Based on the above technical solution, preferably, the number of solder marks is multiple, the length of the solder mark is W2, the width of the solder mark is W5, the area formed by a single solder mark with length W2 and width W5 is S1, the sum of the areas of multiple solder marks is S10, and the cross-sectional area formed by the manifold with radius R0 is S0, wherein the ratio of S10 / S0 ranges from 12% to 24%.

[0015] Based on the above technical solutions, preferably, the area of ​​the injection hole is S21, wherein the ratio of S21 / S0 is in the range of 5%-10%.

[0016] Based on the above technical solution, preferably, the number of vent holes is multiple, the multiple vent holes are located between two adjacent solder marks, and the sum of the areas of the multiple vent holes is S20, wherein the ratio of S20 / S0 is in the range of 5%-12%.

[0017] Based on the above technical solution, preferably, the minimum included angle between two adjacent solder marks is A, wherein the value of A ranges from 75° to 105°.

[0018] Secondly, this utility model also provides a cylindrical secondary battery, including the current collector soldering structure described in any of the above claims.

[0019] The current collector soldering structure and cylindrical secondary battery of this invention have the following advantages over the prior art:

[0020] (1) By controlling the ratio of the shortest distance between the solder mark and the injection hole, the outer edge of the collector plate and the edge of the exhaust hole to the radius of the collector plate within the corresponding range, the flow path is effectively shortened, the internal resistance is reduced, the uniformity of the flow is improved, and the heat concentration and process preparation difficulties are avoided during the welding process, thereby improving the performance and life of the battery cell.

[0021] (2) By controlling the length and width of the weld stamp, and the ratio of the total weld stamp area to the cross-sectional area of ​​the collector plate within the appropriate range, the firmness of the weld and the smoothness of current conduction are effectively ensured, and the weld connection strength is improved.

[0022] (3) By controlling the ratio of the area of ​​the injection hole and the vent hole to the cross-sectional area of ​​the collector plate, and by setting the range of the shortest distance between the edge of the injection hole and each vent hole and the shortest distance between the outer edge of the collector plate and each vent hole, the smoothness and consistency of the injection and venting process are ensured, and the safety and stability of the battery cell are improved.

[0023] (4) Multiple solder marks are distributed around the center of the current collector, and the minimum included angle between two adjacent solder marks is controlled at 75°-105°, so that the current distribution on the current collector is more uniform, reducing internal resistance and rate rise, and improving the efficiency and life of the battery cell. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

[0026] Figure 2 This is a schematic diagram of the solder mark width of this utility model;

[0027] Figure 3 This is a schematic diagram showing the structural area markings of this utility model;

[0028] Figure 4 This is a schematic diagram of the welding angle marking of this utility model;

[0029] Figure 5 This is a schematic diagram showing the distance markings between the injection hole and the vent hole and the manifold of this utility model. Detailed Implementation

[0030] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0031] like Figure 1 As shown, the present invention discloses a manifold soldering structure, comprising a manifold 1 and a soldering mark 2. The manifold 1 has a circular cross-sectional shape and an injection hole 100 is provided at its center. The soldering mark 2 is disposed on the surface of the manifold 1 and extends along the radial direction of the manifold 1. The shortest distance between the soldering mark 2 and the edge of the injection hole 100 is W1, and the radius of the manifold 1 is R0, wherein the ratio of W1 / R0 ranges from 5% to 15%.

[0032] It should be noted that the current collector 1 is connected to the positive end of the core and the cap by laser welding, which serves as a current collector and conductor. The current collector 1 has an injection hole 100 in the center to facilitate the injection of electrolyte into the battery. The welding mark 2 on the current collector 1 is used to connect the current collector 1 and the core, which not only ensures the strength of the welding, but also allows the current to pass through smoothly.

[0033] Understandably, when the ratio of W1 to R0 exceeds 5%-15%, the current conduction path becomes longer, leading to increased internal resistance, uneven current flow, and potentially insufficient weld strength. Conversely, if the ratio of W1 to R0 is below 5%, it may cause concentrated heat generation during welding, resulting in excessive temperature rise, which not only affects welding quality but may also cause thermal damage to surrounding components. Furthermore, from a process fabrication perspective, a ratio of W1 to R0 that is too small also increases fabrication difficulty, making it easy for the bonding wire to deviate from the solderable area of ​​the current collector during welding, leading to poor welding or insufficient connection strength. Therefore, controlling the ratio of W1 to R0 between 5% and 15% ensures both the robustness of the weld and the smoothness of current conduction, while also considering the feasibility and reliability of the process fabrication.

[0034] Specifically, in this embodiment, the radius R0 of the manifold 1 ranges from 8.5 to 9.6 mm, and in this embodiment, the radius R0 of the manifold 1 is 9.1 mm. The shortest distance W1 between the solder mark 2 and the edge of the injection hole 100 ranges from 0.6 mm to 1.0 mm, and in this embodiment, the shortest distance W1 between the solder mark 2 and the edge of the injection hole 100 is 0.8 mm.

[0035] like Figure 1 As shown, in this embodiment, the shortest distance between the solder mark 2 and the outer edge of the manifold 1 is W3, where W3 / R0 = 5%-15%.

[0036] Understandably, when W3 is too large, the current path becomes longer, leading to increased internal resistance, uneven current flow, and potentially insufficient weld strength. Conversely, if W3 is too small, it may cause concentrated heat generation during welding, resulting in excessive temperature rise, which not only affects welding quality but may also cause thermal damage to surrounding components. Furthermore, from a process manufacturing perspective, a small ratio of W3 to R0 also increases manufacturing difficulty, making it easier for the bonding wire to deviate from the solderable area of ​​the current collector during welding, leading to poor welding or insufficient connection strength.

[0037] It should be noted that the shortest distance W3 between the weld mark 2 and the outer edge of the current collector 1 in this embodiment ranges from 0.5mm to 1.1mm. In this embodiment, the specific value of the shortest distance W3 between the weld mark 2 and the outer edge of the current collector 1 is 0.8mm. In addition, the specific ratio of W3 / R0 in this embodiment is 9%, which ensures the strength of the weld and the smoothness of current conduction, while avoiding problems caused by excessively long current conduction paths or concentrated welding heat. This achieves optimization of weld quality, current conduction performance and overall structural stability.

[0038] like Figure 1 As shown, the manifold 1 in this embodiment is also provided with an exhaust hole 110. The exhaust hole 110 is located on one side of the injection hole 100 and is set close to the solder mark 2. The shortest distance between the solder mark 2 and the edge of the exhaust hole 110 is W4, wherein the ratio of W4 / R0 is in the range of 7%-17%.

[0039] Understandably, when W4 is too large, the flow path becomes longer, leading to increased internal resistance, uneven current distribution, and potentially insufficient weld strength. Conversely, if W4 is too small, it may cause concentrated heat generation during welding, resulting in excessive temperature rise, which not only affects welding quality but may also cause thermal damage to surrounding components. Furthermore, from a process manufacturing perspective, a small ratio of W4 to R0 also increases manufacturing difficulty, making it easier for the bonding wire to deviate from the solderable area of ​​the current collector during welding, leading to poor welding or insufficient connection strength.

[0040] It should be noted that the vent 110 on the collector plate 1 can effectively help the battery cell to expel the gas generated during charging and discharging, ensuring the safety and stability of the battery cell. In this embodiment, the shortest distance between the solder mark 2 and the edge of the vent 110 is in the range of 0.7mm-1.3mm. In this embodiment, the specific value of the shortest distance between the solder mark 2 and the edge of the vent 110 is W4 = 1mm. In addition, the specific ratio of W4 / R0 in this embodiment is 11%, which not only ensures the firmness of the welding and the venting efficiency of the battery cell, but also avoids problems caused by the welding position being too close or the vent 110 being improperly set.

[0041] like Figure 1 As shown, the length of the solder mark 2 in this embodiment is W2, and the ratio of W2 / R0 ranges from 48% to 62%.

[0042] It should be noted that if the length of W2 is greater than the range, that is, the length of solder mark 2 is too long, it may cause the solder line to deviate from the solderable area of ​​current collector 1, which will not only increase the difficulty of welding, but may also affect the quality and reliability of welding. At the same time, an excessively long solder mark 2 will also increase the process cycle and increase production costs. Conversely, if W2 is less than or greater than the range, that is, the length of solder mark 2 is too short, the current conduction path will become longer, resulting in a larger internal resistance. The increase in internal resistance may cause the heat to be concentrated at the welding point, resulting in an excessive rate rise, which will affect the performance and life of the cell. In addition, an excessively short solder mark may also cause insufficient welding connection strength and reduce the structural stability of the current collector.

[0043] Specifically, in this embodiment, the length of the solder mark 2 ranges from 4mm to 6mm. In this embodiment, the length of the solder mark 2 is specifically W2 = 5mm. In addition, the specific ratio of W2 / R0 in this embodiment is 55%, which ensures both the strength of the weld and the smoothness of current conduction, while avoiding problems caused by the solder mark being too long or too short.

[0044] like Figure 2 As shown, the width of the solder mark 2 in this embodiment is W5, where the ratio of W5 / R0 ranges from 20% to 30%.

[0045] It should be noted that if W5 is too large, meaning the solder mark width is too wide, it may exceed the process capability, causing the solder line to easily deviate from the solderable area of ​​the current collector. This not only increases the difficulty of soldering but may also affect the quality and reliability of the soldering, or even lead to soldering failure. Conversely, if W5 is too small, meaning the solder mark width is too narrow, the current conduction path will be longer, resulting in higher internal resistance. Increased internal resistance will cause concentrated heat generation at the solder joint, leading to excessive rate rise and thus affecting the performance and lifespan of the cell. In addition, an excessively narrow solder mark may also result in insufficient solder joint strength, reducing the structural stability of the current collector and even potentially causing the solder joint to break during use.

[0046] Specifically, in this embodiment, the width of the solder mark 2 ranges from 1.8mm to 2.8mm. In this embodiment, the width of the solder mark 2 is specifically W5 = 2.3mm. In addition, the specific ratio of W5 / R0 in this embodiment is 25%, which ensures both the feasibility of the welding process and the smoothness of current conduction and the strength of the weld connection.

[0047] like Figure 3As shown, in this embodiment, there are multiple solder marks 2. The length of the solder mark 2 is W2, the width of the solder mark 2 is W5, the area of ​​a single solder mark 2 calculated with length W2 and width W5 is S1, the sum of the areas of multiple solder marks 2 is S10, and the cross-sectional area of ​​the collector plate 1 calculated with radius R0 is S0. The ratio of S10 / S0 ranges from 12% to 24%.

[0048] It should be noted that the multiple solder marks 2 are centrally symmetrically distributed around the center of the current collector 1, which makes the current distribution on the current collector 1 more uniform and avoids the situation of excessive or insufficient local current, thereby improving the performance and life of the battery cell.

[0049] In addition, if S10 is too large, that is, the total solder area is too large, it may cause the solder line to deviate from the solderable area of ​​the current collector, increasing the difficulty and risk of soldering. At the same time, an excessively large solder area will also increase the amount of material used and increase production costs. Conversely, if S10 is too small, that is, the total solder area is too small, the current conduction path will be longer, resulting in a larger internal resistance. The increase in internal resistance will cause the heat at the solder joint to be concentrated, resulting in an excessive rate rise, which will affect the performance and life of the cell. Furthermore, an excessively small solder area may also cause insufficient solder joint strength, reducing the structural stability of the current collector.

[0050] Specifically, in this embodiment, there are four solder marks 2, and the four solder marks 2 are centrally symmetrically distributed around the center of the collector plate 1. The cross-sectional area of ​​the collector plate 1 ranges from 240 to 280 mm. 2 The cross-sectional area of ​​the collector plate 1 is specifically taken as 260mm. 2 The area formed by a single solder mark 2 is S1, and the value of the area formed by a single solder mark 2 ranges from 10 to 13 mm. 2 The area formed by a single solder mark 2 is specifically taken as 11.5mm. 2 Based on the four weld marks 2, the sum of the areas of all weld marks 2 is calculated, and the range of the sum of the areas of all weld marks 2 is 40-52 mm. 2 In this embodiment, the sum of the areas of all solder marks 2 is specifically taken as 46mm. 2 In this embodiment, the specific value of S10 / S0 is 18%, which ensures both the strength of the weld and the smoothness of current conduction, while avoiding problems caused by the weld area being too large or too small.

[0051] like Figure 3 As shown, the area of ​​the injection hole 100 in this embodiment is S21, wherein the ratio of S21 / S0 ranges from 5% to 10%.

[0052] It should be noted that if the area S21 of the injection hole 100 is too large, i.e., it occupies a large proportion of the current collector area, it will adversely affect the solderable area. The reduction in the solderable area may limit the selection and flexibility of the welding process, and may also affect the quality and reliability of the welding. In addition, an excessively large injection hole may also cause uneven current distribution on the current collector, affecting the consistency of overcurrent and thus reducing the performance of the cell. Conversely, if the area S21 of the injection hole 100 is too small, i.e., the size of the injection hole 100 is insufficient, it will affect the smooth progress of the injection process. The size of the injection hole 100 is directly related to the injection speed and efficiency. An excessively small injection hole 100 may increase the difficulty of injection, prolong the injection time, and may even lead to incomplete injection or inaccurate injection volume. In addition, an excessively small injection hole 100 may also affect the venting process inside the cell, resulting in gas residue, which will affect the safety and stability of the cell.

[0053] Specifically, in this embodiment, the area of ​​the injection hole 100 ranges from 17 to 23 mm. 2 The area of ​​the injection hole 100 is specifically taken as 19.6 mm². 2 The radius of the injection hole 100 is 2.5 mm; the specific value of S21 / S0 in this embodiment is 7.5%; this ensures the smooth progress of the injection process and the air venting effect, while avoiding problems caused by the injection hole being too large or too small.

[0054] like Figure 3 As shown, in this embodiment, there are multiple vent holes 110. The multiple vent holes 110 are located between two adjacent solder marks 2, and the sum of the areas of the multiple vent holes 110 is S20, wherein the ratio of S20 / S0 ranges from 5% to 12%.

[0055] It should be noted that if the sum of the areas of the vent holes 110, S20, is too large, that is, if it occupies a large proportion of the current collector area, it will have an adverse effect on the solderable area. Excessively large vent holes 110 may reduce the area available for welding, thereby limiting the choice and flexibility of welding processes, and may affect the quality and reliability of welding. At the same time, excessively large vent holes 110 may also cause uneven current distribution on the current collector, affecting the consistency of overcurrent. Conversely, if the sum of the areas of the vent holes 110, S20, is too small, that is, if the total area of ​​the vent holes 110 is insufficient, it will affect the venting effect inside the cell. Effective venting can ensure stable pressure inside the cell and prevent safety problems caused by gas accumulation. Excessively small vent holes may increase the difficulty of venting, prolong the venting time, and even lead to incomplete venting, affecting the performance and safety of the cell.

[0056] Specifically, in this embodiment, there are three vent holes 110, which are located between two adjacent solder marks 2. In this embodiment, the area S22 of a single vent hole 110 ranges from 6 to 8 mm. 2 The area S22 of a single exhaust port 110 is specifically taken as 7.1 mm². 2 The radius of the vent hole 110 is 1.5 mm; the sum of the areas of the multiple vent holes 110 ranges from 18 to 24 mm. 2 The specific range of the sum of the areas of the multiple vent holes 110 is S20 = 21.3 mm. 2 In this embodiment, the specific value of S20 / S0 is 8.2%; this ensures the venting effect inside the battery cell while avoiding problems caused by venting holes that are too large or too small.

[0057] like Figure 4 As shown, in this embodiment, the minimum included angle between two adjacent solder marks 2 is A, where the value of A ranges from 75° to 105°.

[0058] It should be noted that if the minimum included angle A between two adjacent solder marks 2 is too large, such as exceeding 105°, it may cause uneven current distribution on the current collector. Uneven current distribution increases the internal resistance of the cell because the current encounters more resistance when flowing through the current collector. Increased internal resistance not only reduces the efficiency of the cell but may also cause the cell to generate more heat during discharge, thus affecting the cell's performance and lifespan. Conversely, if the minimum included angle A between two adjacent solder marks 2 is too small, such as less than 75°, it may cause concentrated heat effects during welding. If the heat generated during welding cannot be effectively dissipated, it will lead to excessively high local temperatures, resulting in excessive rate rise. Excessive rate rise not only affects the welding quality of the cell but may also damage the internal structure of the cell, reducing its safety and reliability.

[0059] Specifically, in this embodiment, the minimum included angle A between two adjacent solder marks 2 is 90°; this ensures the uniform distribution of current on the current collector, reduces internal resistance, and avoids the concentration of heat effects during welding, thus ensuring the welding quality and performance of the battery cell.

[0060] like Figure 5As shown, if the distance L1 between the edge of the injection hole 100 and each vent hole 110 is too large, it may affect the consistency of venting. During the cell injection and venting process, the gas needs to be smoothly discharged through the vent holes 110. If L1 is too large, it may increase the path length of gas flow, leading to poor venting and affecting venting efficiency and consistency. At the same time, an excessively large L1 may also affect the valve opening time, because the gas needs more time to flow from the vicinity of the injection hole 100 to the vent holes 110 and be discharged. Conversely, if the value of L1 is too small, that is, the distance between the edge of the injection hole 100 and each vent hole 110 is too close, the excessively close distance may cause mutual interference during the injection and venting process, affecting the accuracy of injection and the smoothness of venting. In addition, an excessively small L1 may also increase the difficulty of the manufacturing process, because the position and size of the injection hole 100 and the vent holes 110 need to be controlled more precisely.

[0061] Specifically, in this embodiment, the shortest distance L1 between the edge of the injection hole 100 and each vent hole 110 is 0.8-1.4mm, which ensures the consistency of venting and avoids mutual interference during the injection and venting process, thus avoiding affecting the valve opening time.

[0062] like Figure 5 As shown, if the distance L2 between the outer edge of the collector plate 1 and each vent hole 110 is too large, the gas flow path during the venting process will be too long, thus affecting the smoothness and consistency of venting. The gas will take longer to flow from the edge of the collector plate to the vent hole and be discharged, which will prolong the valve opening time and reduce the liquid injection and venting efficiency of the cell. Conversely, if the value of L2 is too small, that is, the distance between the outer edge of the collector plate 1 and each vent hole 110 is too close, the collector plate will interfere with the vent hole during manufacturing or use, affecting the structural stability and safety of the cell. In addition, an excessively small L2 may also make the vent hole more susceptible to external contamination or damage, thus affecting its venting function.

[0063] Specifically, in this embodiment, the shortest distance L2 between the outer edge of the current collector 1 and each exhaust hole 110 is 1.5-3.5mm, which takes into account both exhaust efficiency and ensures the structural stability and safety of the battery cell.

[0064] Secondly, this utility model also provides a cylindrical secondary battery, including the aforementioned current collector soldering structure.

[0065] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A current collector soldering structure, characterized in that, Includes a manifold (1) and solder pads (2), wherein, A liquid injection hole (100) is provided at the center of the manifold (1); The solder mark (2) is set on the surface of the collector plate (1), and the solder mark (2) extends along the radial direction of the collector plate (1); The shortest distance between the solder mark (2) and the edge of the injection hole (100) is W1, and the radius of the manifold (1) is R0, wherein the ratio of W1 / R0 is in the range of 5%-15%.

2. The manifold soldering structure as described in claim 1, characterized in that: The shortest distance between the solder mark (2) and the outer edge of the manifold (1) is W3, where W3 / R0 = 5%-15%.

3. The manifold soldering structure as described in claim 2, characterized in that: The manifold (1) is also provided with an exhaust hole (110). The exhaust hole (110) is located on one side of the injection hole (100) and close to the solder mark (2). The shortest distance between the solder mark (2) and the edge of the exhaust hole (110) is W4, where the ratio of W4 / R0 is in the range of 7%-17%.

4. The manifold soldering structure as described in any one of claims 1-3, characterized in that: The length of the solder mark (2) is W2, wherein the ratio of W2 / R0 ranges from 48% to 62%.

5. The manifold soldering structure as described in any one of claims 1-3, characterized in that: The width of the solder mark (2) is W5, wherein the ratio of W5 / R0 is in the range of 20%-30%.

6. The manifold soldering structure as described in claim 3, characterized in that: The number of the solder marks (2) is multiple, the length of the solder mark (2) is W2, the width of the solder mark (2) is W5, the area of ​​the region formed by a single solder mark (2) with length W2 and width W5 is S1, the sum of the areas of multiple solder marks (2) is S10, and the cross-sectional area of ​​the collector plate (1) with radius R0 is S0, wherein the ratio of S10 / S0 ranges from 12% to 24%.

7. The manifold soldering structure as described in claim 6, characterized in that: The area of ​​the injection hole (100) is S21, wherein the ratio of S21 / S0 ranges from 5% to 10%.

8. The manifold soldering structure as described in claim 6, characterized in that: The number of vent holes (110) is multiple, and the multiple vent holes (110) are located between two adjacent solder marks (2), and the sum of the areas of the multiple vent holes (110) is S20, wherein the ratio of S20 / S0 is in the range of 5%-12%.

9. The manifold soldering structure as described in claim 6, characterized in that: The minimum included angle between two adjacent solder marks (2) is A, where the value of A ranges from 75° to 105°.

10. A cylindrical secondary battery, characterized in that, Includes the manifold solder pad structure as described in any one of claims 1-9.

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