Cylindrical secondary battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a cylindrical secondary battery which comprises a collector plate body, and a central hole and a plurality of exhaust holes positioned on one side of the central hole are formed in the collector plate body; the multiple welding marks surround the center hole and are located between every two adjacent exhaust holes. The collector plate tail body is connected with the collector plate body; the radius of the collector plate body is R0, the area of the large surface of the collector plate body is S0 by calculating the radius R0, the sum of the areas of the plurality of welding marks is S1, and S1 / S0 is equal to 12%-24%. According to the utility model, parameter limitation is carried out on the area proportion of the welding marks, so that the collector plate has good flow passing capability, high connection strength and good heat dissipation capability, does not interfere with the welding process and the liquid injection and exhaust process, and has good application performance.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and in particular relates to a cylindrical secondary battery. Background Technology

[0002] Cylindrical secondary batteries are widely used in new energy electric vehicles and energy storage containers. A cylindrical secondary battery typically consists of a casing, winding cores, current collectors, and a top cover. The current collectors are the main component used for electrical connection between the winding cores and the terminals or top cover, and they handle the current flow. Therefore, the proper placement of the current collectors directly affects the performance, safety, and stability of the cylindrical secondary battery.

[0003] However, existing battery cap designs in the market have certain flaws: current current collector structures generally do not adequately consider the impact of solder area and layout, and do not ensure that the percentage of solder area to return plate area is within a reasonable range. Specifically, when the solder area is too large, the solder lines are prone to deviating from the solderable area of ​​the current collector, increasing costs unnecessarily; when the solder area is too small, it leads to a longer current path, higher internal resistance, which in turn causes concentrated heat generation at the weld, excessive rate rise, and may also result in insufficient weld connection strength.

[0004] Patent (publication number CN222029200U) discloses a current collector and a battery having the same, comprising: a body, a welding area on the body for welding to an electrode assembly, the welding area being a plurality of spaces spaced apart along the circumferential direction of the body, each welding area having a solder mark assembly, the solder mark assembly comprising a plurality of solder points arranged sequentially, the solder mark assembly being V-shaped. This solution discloses a certain technical solution regarding the layout of the solder marks; however, it still lacks details regarding the area layout and structural spacing. The layout, area, and structural spacing of the current collector solder mark structure are all crucial to battery performance and therefore urgently need improvement.

[0005] In view of the above, this application is hereby submitted. Utility Model Content

[0006] To address the shortcomings of related technologies, this utility model provides a cylindrical secondary battery that ensures good application performance by controlling the structural layout, area, and structural spacing of the solder marks, central hole, and vent holes on the current collector body.

[0007] This utility model provides a cylindrical secondary battery, comprising:

[0008] The collector plate body has a central hole and multiple exhaust holes located on one side of the central hole;

[0009] Multiple solder marks surround the central hole and are located between two adjacent vent holes;

[0010] The collector plate tail body is connected to the collector plate body.

[0011] The radius of the manifold body is R0. The large surface area of ​​the manifold body is S0, calculated based on the radius R0. The sum of the areas of multiple solder marks is S1. S1 / S0 = 12% - 24%.

[0012] In some embodiments, the cross-sectional area of ​​the central hole is S21, and the ratio of the cross-sectional area of ​​the central hole to the large surface area of ​​the collector plate body is S21 / S0 = 5%-10%.

[0013] In some embodiments, the sum of the cross-sectional circular areas of the plurality of exhaust holes is S22, and the ratio of the sum of the cross-sectional circular areas of the exhaust holes to the large surface area of ​​the collector plate body is S22 / S0 = 5%-12%.

[0014] In some embodiments, the width of a single solder mark is W5, the length is W2, and the radius of the manifold body is R0, wherein...

[0015] The ratio of the width of the solder mark to the radius of the manifold body is W5 / R0 = 20%-30%;

[0016] The ratio of the length of the solder mark to the radius of the manifold body is W2 / R0 = 48%-62%.

[0017] In some embodiments, the minimum distance between the solder mark and the center hole is W1, and the ratio of the minimum distance between the solder mark and the center hole to the radius of the collector plate body is W1 / R0 = 5%-15%.

[0018] The minimum distance between the solder mark and the edge of the manifold body is W3, and the ratio of the minimum distance between the solder mark and the edge of the manifold body to the radius of the manifold body is W3 / R0 = 5%-15%.

[0019] The minimum distance between the solder mark and the vent hole is W4, and the ratio of the minimum distance between the solder mark and the vent hole to the radius of the manifold body is W4 / R0 = 7%-17%.

[0020] In some embodiments, the minimum distance between the center hole and the exhaust hole is L1, and the ratio of the minimum distance between the center hole and the exhaust hole to the radius of the collector plate body is L1 / R0 = 5%-20%.

[0021] The minimum distance from the edge of the collector plate to the exhaust port is L2, and the ratio of the minimum distance from the edge of the collector plate to the exhaust port to the radius of the collector plate is L2 / R0 = 22%-32%.

[0022] In some embodiments, each solder mark has multiple solder lines, the minimum distance between solder lines is W1, and the ratio of the minimum distance between solder lines to the width of the solder mark is W1 / W5 = 12%-22%.

[0023] In some embodiments, the average width of the multiple bonding lines is W2, and the ratio of the average width of the multiple bonding lines to the width of the solder mark is W2 / W5 = 17%-27%.

[0024] In some embodiments, multiple solder marks are arranged around a central hole, and the minimum included angle B between the solder marks is 75°-105°.

[0025] In some embodiments, the bonding wire has a wavy structure, and the included angle A at the bend of the bonding wire is 50°-75°.

[0026] Based on the above technical solution, the welding structure of the manifold in this embodiment of the utility model controls the structural layout, area ratio and spacing ratio of the central hole, vent hole and weld mark on the manifold body, so that the manifold has a reasonable structure, so that the manifold has good flow capacity, can avoid heat generation, and ensure the strength of the connection structure and the liquid injection and venting performance. In this way, the application stability and safety performance of the manifold can be effectively guaranteed. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the welding structure of the current collector of the cylindrical secondary battery of this utility model;

[0029] Figure 2 This is a schematic diagram showing the dimensions of the current collector welding structure of the cylindrical secondary battery of this utility model;

[0030] Figure 3 This is a weld pattern diagram of the current collector welding structure of the cylindrical secondary battery of this utility model.

[0031] Figure 4 This is a schematic diagram showing the area range of a single weld mark in the current collector welding structure of the cylindrical secondary battery of this utility model.

[0032] In the picture:

[0033] 1. Collector plate body; 101. Center hole; 102. Exhaust hole;

[0034] 2. Solder mark; 21. Solder wire;

[0035] 3. Collector plate tail body. Detailed Implementation

[0036] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0037] In the description of this utility model, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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.

[0038] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 or an indirect connection through an intermediate medium; and they can refer to the internal connection of 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.

[0040] As attached Figure 1 and Figure 2 As shown, in one illustrative embodiment of the current collector welding structure of the cylindrical secondary battery of this utility model, the current collector welding structure includes a current collector body 1, a weld mark 2, and a current collector tail body 3.

[0041] like Figure 1As shown, the collector plate body 1 is provided with a central hole 101 and multiple vent holes 102 located on one side of the central hole 101; multiple solder marks 2 surround the central hole 101 and are located between two adjacent vent holes 102; the collector plate tail body 3 is connected to the collector plate body 1; the radius of the collector plate body 1 is R0, the large surface area of ​​the collector plate body 1 calculated with radius R0 is S0, the sum of the areas of the multiple solder marks 2 is S1, and S1 / S0 = 12%-24%.

[0042] In the above structure, the current collector body 1 is used to weld with the battery core, the current collector tail body 3 is used to connect to the battery terminal to realize current transmission; the center hole 101 is used to inject electrolyte into the battery and can also play a role in venting; the vent hole 102 is used for venting the battery.

[0043] The current collector body 1 is a thin circular sheet, with one of the circular surfaces being the largest. This solution controls the area ratio of the solder mark 2 to the current collector body 1 to be S1 / S0 = 12%-24%, which has good application performance. While ensuring the current carrying capacity of the current collector body 1, it can prevent excessive heat generation, avoid connection structure failure, and also avoid cost increases.

[0044] Among them, the large surface area of ​​the collector plate body 1 is S0, which is 240mm. 2 -280mm 2 The area of ​​a single solder mark 2 is 10mm. 2 -13 mm 2 The area of ​​all solder marks 2 and S1 is 40-50mm. 2 .

[0045] Specifically, multiple solder marks 2 are set, and S1 is the sum of the areas of all solder marks 2, so as to satisfy the ratio of the area of ​​solder mark 2 to the large surface area of ​​the collector plate body 1.

[0046] In some embodiments, the radius R0 of the collector plate body 1 is 9.1 mm, the length W2 of the solder mark 2 is 5 mm, the width W5 is 2.3 mm, and the large surface area S0 of the collector plate body 1 is 260 mm². 2 The area of ​​a single solder mark 2 is 11.5 mm. 2 The total area of ​​all solder marks 2 is 46 mm². 2 S1 / S0 = 18%;

[0047] If S1 is too large, the solder wire is likely to deviate from the solderable area of ​​the manifold, making it difficult to balance cost.

[0048] If S1 is too small, the flow path will become longer, resulting in a larger internal resistance of the collector plate; this will lead to concentrated heat generation at the weld and excessive temperature rise; it may also cause insufficient weld connection strength. By controlling the ratio of the above parameters, these problems can be effectively suppressed.

[0049] like Figure 2 As shown, the cross-sectional area of ​​the central hole 101 is S21, and the ratio of the cross-sectional area of ​​the central hole 101 to the large surface area of ​​the collector plate body 1 is S21 / S0 = 5%-10%.

[0050] Among them, the large surface area of ​​the collector plate body 1 is S0, which is 240mm. 2 -280mm 2 The cross-sectional area S21 of the central hole 101 is 17 mm². 2 -23 mm 2 .

[0051] In some embodiments, the radius of the collector plate body 1 is R0 = 9.1 mm, the radius of the central hole is R1 = 2.5 mm, and the large surface area of ​​the collector plate body 1 is S0 = 260 mm². 2 The cross-sectional area S21 of the central hole 101 is 19.6 mm². 2 S21 / S0 = 7.5%;

[0052] If S21 is too large, it will affect the weldable area and thus affect the consistency of the current flow in the manifold body 1.

[0053] If S21 is too small, it will affect the convenience of liquid injection during the liquid injection mechanism and will also affect the venting of the battery.

[0054] like Figure 2 As shown, the sum of the cross-sectional circular areas of the multiple exhaust holes 102 is S22, and the ratio of the sum of the cross-sectional circular areas of the exhaust holes 102 to the large surface area of ​​the collector plate body 1 is S22 / S0 = 5%-12%.

[0055] Among them, the large surface area of ​​the collector plate body 1 is S0, which is 240mm. 2 -280mm 2 The cross-sectional area of ​​a single exhaust port 102 is 6 mm². 2 -8mm 2 The sum of the cross-sectional areas of all exhaust holes 102 is 18 mm². 2 -24mm 2 .

[0056] In some embodiments, the radius R0 of the collector plate body 1 is 9.1 mm, the radius R2 of a single exhaust hole 102 is 1.5 mm, and the large surface area S0 of the collector plate body 1 is 260 mm². 2 The cross-sectional area of ​​a single exhaust port 102 is 7.1 mm². 2 The total area of ​​the cross-sectional circle of all exhaust holes 102 is 21.3 mm². 2 ;

[0057] If S22 is too large, it will affect the weldable area and thus affect the consistency of the current flow in the manifold body 1.

[0058] If S22 is too small, it will affect the convenience of liquid injection during the liquid injection mechanism and will also affect the venting of the battery.

[0059] like Figure 2 As shown, the width of a single solder mark 2 is W5, the length is W2, and the radius of the collector plate body 1 is R0. The ratio of the width of the solder mark 2 to the radius of the collector plate body 1 is W5 / R0 = 20%-30%; the ratio of the length of the solder mark 2 to the radius of the collector plate body 1 is W2 / R0 = 48%-62%.

[0060] The radius R0 of the collector plate body 1 is 8.5mm-9.6mm, the width W5 of a single solder mark 2 is 2.0mm-3.0mm, the length W2 of a single solder mark 2 is 4mm-6mm, the ratio of the width of the solder mark 2 to the radius of the collector plate body 1 is W5 / R0 = 20%-30%, and the ratio of the length of the solder mark 2 to the radius of the collector plate body 1 is W2 / R0 = 48%-62%.

[0061] In some embodiments, the radius R0 of the manifold body 1 is 9.1 mm, the width W5 of a single solder mark 2 is 2.3 mm, the length W2 of a single solder mark 2 is 5 mm, W5 / R0 = 25%, and W2 / R0 = 55%.

[0062] If W2 or W5 is too large, the solder wire is likely to deviate from the solderable area of ​​the manifold, which will lengthen the process cycle and increase the cost.

[0063] If W2 or W5 is too small, the flow path of the collector plate body 1 will become longer, resulting in a larger internal resistance, which in turn will cause concentrated heat generation at the weld, resulting in an excessively large multiplier temperature rise; it may also cause insufficient weld connection strength.

[0064] like Figure 2 As shown, the minimum distance between the weld mark 2 and the center hole 101 is W1, and the ratio of the minimum distance between the weld mark 2 and the center hole 101 to the radius of the collector plate body 1 is W1 / R0 = 5%-15%; the minimum distance between the weld mark 2 and the edge of the collector plate body 1 is W3, and the ratio of the minimum distance between the weld mark 2 and the edge of the collector plate body 1 to the radius of the collector plate body 1 is W3 / R0 = 5%-15%; the minimum distance between the weld mark 2 and the exhaust hole 102 is W4, and the ratio of the minimum distance between the weld mark 2 and the exhaust hole 102 to the radius of the collector plate body 1 is W4 / R0 = 7%-17%.

[0065] Among them, the radius R0 of the collector plate body 1 is 8.5mm-9.6mm, the minimum distance W1 between the weld mark 2 and the center hole 101 is 0.6mm-1.0mm, and W1 / R0 = 5%-15%; the minimum distance W3 between the weld mark 2 and the edge of the collector plate body 1 is 0.5mm-1.1mm, and W3 / R0 = 5%-15%; the minimum distance W4 between the weld mark 2 and the exhaust hole 102 is 0.7mm-1.3mm, and W4 / R0 = 7%-17%.

[0066] In some embodiments, the radius R0 of the manifold body 1 is 9.1 mm, the minimum distance W1 between the solder mark 2 and the center hole 101 is 0.8 mm, and W1 / R0 = 9%; the minimum distance W3 between the solder mark 2 and the edge of the manifold body 1 is 0.8 mm, and W3 / R0 = 9%; the minimum distance W4 between the solder mark 2 and the exhaust hole 102 is 1 mm, and W4 / R0 = 11%.

[0067] If W2 or W5 is too large, the solder wire is prone to deviating from the solderable area of ​​the manifold; the process cycle is longer and the cost is higher.

[0068] If W2 or W5 is too small, the flow path of the collector plate body 1 will become longer, resulting in a larger internal resistance, which in turn will cause concentrated heat generation at the weld, resulting in an excessively large multiplier temperature rise; it may also cause insufficient weld connection strength.

[0069] In this scheme, the area of ​​solder mark 2 is... Figure 4 The area inside the dashed box shown;

[0070] like Figure 4 As shown, if the edge of solder mark 2 is a standard rectangle, then the formula for calculating the area of ​​the solder mark is W2*W5.

[0071] like Figure 2 As shown, the minimum distance between the center hole 101 and the exhaust hole 102 is L1, and the ratio of the minimum distance between the center hole 101 and the exhaust hole 102 to the radius of the collector plate body 1 is L1 / R0 = 5%-20%; the minimum distance between the edge of the collector plate body 1 and the exhaust hole 102 is L2, and the ratio of the minimum distance between the edge of the collector plate body 1 and the exhaust hole 102 to the radius of the collector plate body 1 is L2 / R0 = 22%-32%;

[0072] The radius R0 of the collector plate body 1 is 8.5mm-9.6mm, the minimum distance L1 between the center hole 101 and the exhaust hole 102 is 0.8mm-1.4mm, and L1 / R0 = 5%-20%; the minimum distance L2 between the edge of the collector plate body 1 and the exhaust hole 102 is 1.5mm-3.5mm, and L2 / R0 = 22%-32%.

[0073] In some embodiments, the radius R0 of the collector plate body 1 is 9.1 mm, the minimum distance L1 between the center hole 101 and the exhaust hole 102 is 1.1 mm, and L1 / R0 = 12%; the minimum distance L2 between the edge of the collector plate body 1 and the exhaust hole 102 is 2.5 mm, and L2 / R0 = 27.5%.

[0074] In this way, by controlling the above parameters, it is possible to avoid affecting the consistency of exhaust and the valve opening time, thereby ensuring the safety performance of the battery.

[0075] like Figure 2 and Figure 3 As shown, each solder mark 2 has multiple solder lines 21, the minimum distance between solder lines 21 is W1, and the ratio of the minimum distance between solder lines 21 to the width of solder mark 2 is W1 / W5 = 12%-22%.

[0076] Among them, the width W5 of a single solder mark 2 is 2.0mm-3.0mm, the minimum distance W1 between solder lines 21 is 0.3mm-0.5mm, and W1 / W5 = 12%-22%.

[0077] In some embodiments, the width W5 of a single solder mark 2 is 2.3 mm, the minimum distance W1 between solder lines 21 is 0.4 mm, and W1 / W5 = 17%;

[0078] If the spacing between the welding lines 21 is too large, the process cannot meet the requirements, and the welding lines are prone to deviate from the solderable area of ​​the collector plate, resulting in a longer flow path of the collector plate body 1, higher internal resistance and uneven flow; it may also cause insufficient welding connection strength.

[0079] If the spacing between the welding wires 21 is too small, it can easily lead to problems such as welding bursts, and may also cause concentrated welding heat and excessive temperature rise; in addition, it may still cause insufficient welding connection strength.

[0080] like Figure 3 As shown, the average width of the multiple solder lines 21 is W2, and the ratio of the average width of the multiple solder lines 21 to the width of the solder mark 2 is W2 / W5 = 17%-27%; the solder lines 21 have a wavy structure, and the included angle A at the bend of the solder lines 21 is 50°-75°.

[0081] Among them, the average width W2 of the multiple welding lines 21 is 0.4mm-0.6mm, W2 / W5 = 17%-27%, and the included angle A at the bend of the welding line 21 is 50°-75°.

[0082] In some embodiments, the average width W2 of the multiple bonding wires 21 is 0.2 mm, W2 / W5 = 22%, and the included angle A at the bend of the bonding wires 21 is 60°;

[0083] If the width of the bonding wire 21 is too large, the process cannot meet the requirements, and the bonding wire is prone to deviating from the solderable area of ​​the current collector, resulting in a longer flow path of the current collector body 1, higher internal resistance and uneven current flow; it may also cause insufficient welding connection strength.

[0084] If the width of the weld wire 21 is too small, it can easily lead to problems such as weld bursts, and may also cause concentrated welding heat and excessive temperature rise; in addition, it may still result in insufficient weld connection strength.

[0085] By controlling the angle A at the bend of the solder wire 21, good current consistency, good heat dissipation capacity, and good connection strength can be ensured.

[0086] like Figure 1 and Figure 2 As shown, multiple solder marks 2 are arranged around the central hole 101, and the minimum included angle B between the solder marks 2 is 75°-105°;

[0087] Among them, the minimum included angle B between solder mark 2 and solder mark 2 is 75°-105°;

[0088] In some embodiments, the minimum included angle B between solder 2 and solder 2 is 90°;

[0089] If the included angle B is too large, it will cause problems such as excessive internal resistance and uneven current flow.

[0090] If the included angle B is too small, it will cause the welding heat to be concentrated, resulting in a large temperature rise rate.

[0091] When multiple solder marks 2 are set, they are arranged adaptively according to the included angle B.

[0092] Through the description of several embodiments of the welded structure of the manifold of this utility model, it can be seen that the embodiments of the welded structure of the manifold of this utility model have at least one or more of the following advantages:

[0093] (1) By restricting the specific structural layout of the collector plate body 1, the solder mark 2, the center hole 101, the vent hole 102 and the welding line 21, and by restricting the parameters of the corresponding layout spacing, shape, angle and area, the collector plate can have good flow capacity, high connection strength and good heat dissipation capacity, and will not interfere with the welding process and liquid injection and venting process, thus having good application performance.

[0094] (1) By controlling the width, length and bending angle of the welding wire 21, the stability of the welding can be guaranteed and the problem of bursting can be avoided. At the same time, it has good heat dissipation capacity during overcurrent, which can avoid excessive temperature rise due to the multiplier.

[0095] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0096] The above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A cylindrical secondary battery, characterized in that, include: The collector plate body (1) is provided with a central hole (101) and a plurality of exhaust holes (102) located on one side of the central hole (101); Multiple solder marks (2) surround the central hole (101) and are located between two adjacent vent holes (102); The collector plate tail body (3) is connected to the collector plate body (1); The radius of the collector plate body (11) is R0. The large surface area of ​​the collector plate body (1) is calculated using the radius R0 as S0. The sum of the areas of the multiple solder marks (2) is S1. S1 / S0 = 12%-24%.

2. The cylindrical secondary battery according to claim 1, characterized in that, The cross-sectional area of ​​the central hole (101) is S21, and the ratio of the cross-sectional area of ​​the central hole (101) to the large surface area of ​​the collector plate body (1) is S21 / S0 = 5%-10%.

3. The cylindrical secondary battery according to claim 1, characterized in that, The sum of the cross-sectional circular areas of the plurality of exhaust holes (102) is S22, and the ratio of the sum of the cross-sectional circular areas of the exhaust holes (102) to the large surface area of ​​the collector plate body (1) is S22 / S0 = 5%-12%.

4. The cylindrical secondary battery according to any one of claims 1-3, characterized in that, The width of a single solder mark (2) is W5, the length is W2, and the radius of the collector plate body (1) is R0, wherein, The ratio of the width of the solder mark (2) to the radius of the collector plate body (1) is W5 / R0 = 20%-30%; The ratio of the length of the solder mark (2) to the radius of the collector plate body (1) is W2 / R0 = 48%-62%.

5. The cylindrical secondary battery according to claim 4, characterized in that, The minimum distance between the solder mark (2) and the center hole (101) is W1, and the ratio of the minimum distance between the solder mark (2) and the center hole (101) to the radius of the collector plate body (1) is W1 / R0 = 5%-15%. The minimum distance between the solder mark (2) and the edge of the collector plate body (1) is W3, and the ratio of the minimum distance between the solder mark (2) and the edge of the collector plate body (1) to the radius of the collector plate body (1) is W3 / R0 = 5%-15%. The minimum distance between the solder mark (2) and the exhaust hole (102) is W4, and the ratio of the minimum distance between the solder mark (2) and the exhaust hole (102) to the radius of the collector plate body (1) is W4 / R0 = 7%-17%.

6. The cylindrical secondary battery according to claim 5, characterized in that, The minimum distance between the central hole (101) and the exhaust hole (102) is L1, and the ratio of the minimum distance between the central hole (101) and the exhaust hole (102) to the radius of the collector plate body (1) is L1 / R0 = 5%-20%. The minimum distance between the edge of the collector plate body (1) and the exhaust hole (102) is L2, and the ratio of the minimum distance between the edge of the collector plate body (1) and the exhaust hole (102) to the radius of the collector plate body (1) is L2 / R0 = 22%-32%.

7. The cylindrical secondary battery according to claim 4, characterized in that, Each of the solder marks (2) has multiple solder lines (21), the minimum distance between the solder lines (21) is W1, and the ratio of the minimum distance between the solder lines (21) to the width of the solder mark (2) is W1 / W5 = 12%-22%.

8. The cylindrical secondary battery according to claim 7, characterized in that, The average width of each of the solder lines (21) is W2, and the ratio of the average width of each of the solder lines (21) to the width of the solder mark (2) is W2 / W5 = 17%-27%.

9. The cylindrical secondary battery according to claim 4, characterized in that, Multiple solder marks (2) are arranged around the central hole (101), and the minimum included angle B between the solder marks (2) is 75°-105°.

10. The cylindrical secondary battery according to claim 7, characterized in that, The welding line (21) has a wavy structure, and the included angle A at the bend of the welding line (21) is 50°-75°.

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