A cylindrical lithium-ion battery

Abstract

The utility model relates to the technical field of cylindrical battery, put forward a kind of cylindrical lithium ion battery, including positive current collector, negative current collector and cap end plate, the positive current collector includes disc face and tail body, the disc face and the negative current collector are respectively used to with the positive lug and negative lug welding fixed at the both ends of roll core;The tail body is fixedly arranged on the disc face, and is welded with the cap end plate fixed;Multiple first weld marks are equipped on the disc face, and the first weld mark is the welding track of the disc face with the positive lug;Second weld mark is equipped on the tail body;Multiple third weld marks are equipped on the negative current collector.The utility model can take into account the overcurrent capacity and processing efficiency of battery by reasonably limiting the proportion of first weld mark area and disc area, the proportion of second weld mark area and cap end plate area and the proportion of third weld mark area and negative current collector area, to effectively improve the overall performance of battery.

Description

Technical Field

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

[0002] With the continuous development of new energy technologies, batteries, as high-efficiency energy storage devices, are widely used in various portable electronic products, electric vehicles, and large-scale energy storage systems. Among them, cylindrical lithium-ion batteries have gradually become one of the mainstream products in the market due to their excellent performance and high energy density.

[0003] The current collector is an important component of a cylindrical lithium-ion battery, including the positive current collector and the negative current collector. During the assembly process of a cylindrical lithium-ion battery, laser welding or ultrasonic welding is used to fix and connect the positive current collector and the negative current collector to the positive and negative tabs at both ends of the core, respectively, to ensure the performance stability and safety of the battery.

[0004] For example, the utility model disclosed in announcement number CN220895786U discloses a positive current collector, a negative current collector, and a cylindrical battery with all tabs. The positive current collector is configured to include a plate body, a tail body, and a connecting piece. Positive welding patterns are provided on the plate body to achieve welding and fixing of the plate body and the positive tab. Negative welding patterns are provided on the negative current collector to achieve welding and fixing of the negative current collector and the negative tab.

[0005] The area of ​​the weld lines directly affects the overall performance of the battery, but the above-mentioned technical solutions do not reasonably set the area of ​​the weld lines. If the area of ​​the weld lines is too small, the area of ​​the corresponding welding position of the component is reduced, resulting in an increase in the internal resistance of the battery. At the same time, the current carrying capacity of the corresponding welding position is weakened, and the temperature rise at the welding position is increased, affecting the battery performance. If the area of ​​the weld lines is too large, it will not only fail to improve the internal resistance at the welding position, but will also increase the welding time, leading to a decrease in welding efficiency, an increase in the risk of welding defects, and an increase in the manufacturing cost of the battery. Utility Model Content

[0006] In view of this, the present invention proposes a cylindrical lithium-ion battery. By reasonably setting the area of ​​the welding positions of the positive electrode current collector and the negative electrode current collector, the battery's current carrying capacity and processing efficiency can be balanced, thereby effectively improving the overall performance of the battery.

[0007] The technical solution of this utility model is implemented as follows: This utility model provides a cylindrical lithium-ion battery, including a positive electrode current collector, a negative electrode current collector, and a cap end plate. The positive electrode current collector includes a disk surface and a tail body. The disk surface and the negative electrode current collector are respectively used to weld and fix to the positive electrode tabs and negative electrode tabs at both ends of the winding core. The tail body is fixedly disposed on the disk surface and welded and fixed to the cap end plate.

[0008] The disk surface has multiple first solder marks, which are the welding paths between the disk surface and the positive electrode tab; the radius of the disk surface is R. 10 The area of ​​the disk is S. 10 The first solder mark has a span of L along its length. 10 The first solder mark has a span of W along its width direction. 10 The area of ​​one of the first solder marks is S 100 The sum of the area of ​​the multiple first solder marks is S 1000 , of which S 10 =π·R 10 2 S 100 =L 10 ·W 10 S 1000 / S 10 =12%~24%;

[0009] The tail section has a second weld mark, which is the welding trajectory between the tail section and the cap end plate; the radius of the cap end plate is R. 30 The area of ​​the cap end plate is S. 30 The second solder mark has a span of L along its length. 30 The second solder mark has a span of W along its width direction. 30 The area of ​​the second solder mark is S 31 , of which S 30 =π·R 30 2 S 31 =L 30 ·W 30 S 31 / S 30 =4% to 5.6%;

[0010] The negative electrode current collector has multiple third solder marks, which are the welding paths between the negative electrode current collector and the negative electrode tab; the radius of the negative electrode current collector is R. 20 The area of ​​the negative electrode current collector is S. 20 The span of the third solder mark along its length is L. 20 The span of the third solder mark along its width direction is W. 20 The area of ​​one of the third solder marks is S. 200 The sum of the area of ​​the multiple third solder marks is S. 2000 , of which S 20 =π·R 20 2 S 200=L 20 ·W 20 S 2000 / S 20 =10%~20%.

[0011] Based on the above technical solutions, the preferred option is S. 100 / S 10 =3%~6%, S 31 =5mm 2 ~7mm 2 S 200 / S 20 =3% to 5%.

[0012] Further optimized, S 100 / S 10 =4%~5%, S 1000 / S 10 =16%~20%.

[0013] Based on the above technical solutions, the preferred option is L. 10 =4mm~6mm, W 10 =2mm~3mm.

[0014] Further optimized, L 30 =3.5mm~4.5mm, W 30 =1mm~2mm.

[0015] Further optimized, L 20 =3.5mm~5.5mm, W 20 =1.6mm~3.4mm.

[0016] Based on the above technical solution, preferably, the first solder mark includes a plurality of parallel and spaced positive electrode solder lines, wherein the span of the solder lines along their width direction is W. 102 Among them, W 102 / W 10 =17% to 27%.

[0017] Based on the above technical solution, preferably, the line width of the second solder mark is W. 301 Among them, W 301 =0.2mm~0.4mm.

[0018] Based on the above technical solution, preferably, the third solder mark includes multiple parallel and spaced negative electrode solder lines, the line width of which is W. 203 Among them, W 203 =0.1mm~0.3mm.

[0019] Based on the above technical solutions, preferably, the width of the tail body is L. 300 , where L 300 =5mm~7mm, R 10 = 8.5mm~9.6mm, R 20 = 8.5mm~10.5mm, R 30 =5.29mm~7.29mm.

[0020] The cylindrical lithium-ion battery of this invention has the following advantages over the prior art:

[0021] (1) By reasonably limiting the ratio of the first soldering area to the disk area, the ratio of the second soldering area to the cap end plate area, and the ratio of the third soldering area to the negative electrode current collector area, the overcurrent capacity and processing efficiency of the battery can be balanced, thereby effectively improving the overall performance of the battery.

[0022] (2) By limiting the specifications of the first, second and third solder marks, the overcurrent capacity of the battery can be further improved, the temperature rise of the battery can be reduced, the processing efficiency of the battery can be improved, and the processing cost of the battery can be reduced. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a front view of a cylindrical lithium-ion battery according to the present invention.

[0025] Figure 2 This is a top view of the positive electrode current collector in a cylindrical lithium-ion battery according to this utility model.

[0026] Figure 3 This is a top view of the disk surface in a cylindrical lithium-ion battery according to this utility model.

[0027] Figure 4 This is a top view of the positive electrode bonding wire in a cylindrical lithium-ion battery according to the present invention.

[0028] Figure 5 This is a front view of the tail section and end cap plate of a cylindrical lithium-ion battery according to this utility model.

[0029] Figure 6This is a front view of the second solder mark in a cylindrical lithium-ion battery according to the present invention.

[0030] Figure 7 This is a top view of the negative electrode current collector in a cylindrical lithium-ion battery according to this utility model.

[0031] Figure 8 This is a top view of the negative electrode bonding wire in a cylindrical lithium-ion battery according to the present invention.

[0032] Among them: 1. Core; 2. Positive current collector; 21. Plate surface; 22. Tail body; 201. First solder mark; 202. Second solder mark; 2011. Positive welding wire; 3. Negative current collector; 301. Third solder mark; 3011. Negative welding wire; 4. Cap end plate. Detailed Implementation

[0033] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. 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 skilled in the art without creative effort are within the scope of protection of this utility model.

[0034] This utility model discloses a cylindrical lithium-ion battery, comprising a core 1, a positive current collector 2, a negative current collector 3, and a cap assembly. The core 1 has a positive electrode tab and a negative electrode tab at both ends, respectively. Figure 1 As shown, the positive current collector 2 is fixedly mounted on the positive electrode tab and welded to the cap assembly, while the negative current collector 3 is welded to the negative electrode tab, thereby enabling the core 1 to conduct with the positive current collector 2 and the negative current collector 3.

[0035] The cap assembly consists of multiple components. The cap assembly is located at one end of the battery casing as the cap end plate 4. The positive electrode current collector 2 includes a plate surface 21 and a tail body 22. The plate surface 21 is welded and fixed to the positive electrode tab. The tail body 22 is fixedly set on the plate surface 21 and welded and fixed to the cap end plate 4, thereby realizing the connection between the positive electrode tab and the cap assembly.

[0036] like Figure 3 As shown, the disk surface 21 is provided with multiple first solder marks 201. The first solder marks 201 are the welding trajectory between the disk surface 21 and the positive electrode tab. The welding head moves along the path of the first solder marks 201 to realize the welding between the disk surface 21 and the positive electrode tab.

[0037] like Figure 5As shown, the tail body 22 is provided with a second weld mark 202. The second weld mark 202 is the welding trajectory between the tail body 22 and the cap end plate 4. The welding head moves along the path of the second weld mark 202 to achieve the welding between the tail body 22 and the cap end plate 4.

[0038] like Figure 7 As shown, the negative current collector 3 is provided with multiple third solder marks 301. The third solder marks 301 are the welding trajectory between the negative current collector 3 and the negative electrode tab. The welding head moves along the path of the third solder marks 301 to realize the welding between the negative current collector 3 and the negative electrode tab.

[0039] Preferably, multiple first solder marks 201 and multiple third solder marks 301 are arranged in a circumferential array around the axis of the core 1 to improve the fixing firmness and stability of the current collector and the electrode tab.

[0040] The first weld mark 201, the second weld mark 202, and the third weld mark 301 are preferably set to a wavy shape. Within the same span, the welding length of the wavy weld line is larger, which can not only enhance the connection strength of the relevant components, but also improve the welding quality and ensure the overall performance of the battery.

[0041] like Figure 2 As shown, the radius of disk 21 is R. 10 The area of ​​panel 21 is S 10 The area of ​​disk 21 is the area of ​​the entire circle containing disk 21, i.e., S 10 =π·R 10 2 ,like Figure 3 As shown, the span of the first solder mark 201 along its length direction is L. 10 The first solder mark 201 has a span of W along its width direction. 10 The area of ​​a first solder mark 201 is S 100 The area of ​​the first solder mark 201 is the area of ​​the rectangular region on the disk surface 21 where the first solder mark 201 is set, i.e., S 100 =L 10 ·W 10 The sum of the areas of multiple first solder marks 201 is S. 1000 .

[0042] like Figure 5 As shown, the width of the tail body 22 is L. 300 The radius of the cap end plate 4 is R. 30 The area of ​​the cap end plate 4 is S. 30 S 30 =π·R 30 2 The span of the second solder mark 202 along its length is L. 30 The span of the second solder mark 202 along its width direction is W.30 The area of ​​the second solder mark 202 is S 31 The area of ​​the second solder mark 202 is the area of ​​the rectangular region on the tail body 22 where the second solder mark 202 is set, i.e., S 31 =L 30 ·W 30 .

[0043] like Figure 7 As shown, the radius of the negative current collector 3 is R. 20 The area of ​​the negative electrode current collector 3 is S. 20 S 20 =π·R 20 2 The span of the third solder mark 301 along its length is L. 20 The span of the third solder mark 301 along its width direction is W. 20 The area of ​​a third solder mark 301 is S 200 The area of ​​the third solder mark 301 is the area of ​​the rectangular region on the negative electrode current collector 3 where the third solder mark 301 is set, i.e., S 200 =L 20 ·W 20 The sum of the areas of multiple third solder marks 301 is S. 2000 .

[0044] In some embodiments, S 1000 / S 10 =12% ​​to 24%, meaning the sum of the areas of multiple first solder marks 201 is 12%, 18%, or 24% of the area of ​​the disk surface 21, etc. If S 1000 / S 10 If the area is less than 12%, then the area of ​​multiple first solder marks 201 is too small, and the welding area between the disk 21 and the positive electrode tab is small, which will not only affect the overall performance of the battery, but also increase its manufacturing cost; if S 1000 / S 10 If the area of ​​multiple first weld marks 201 is too large, the welding path becomes longer, the internal resistance at the welding position is too large, resulting in concentrated heat generation at the welding position, leading to problems such as excessive battery rate temperature rise and insufficient welding connection strength.

[0045] In some embodiments, S 31 / S 30 =4% to 5.6%, meaning the area of ​​the second solder mark 202 is 4%, 4.8%, or 5.6% of the area of ​​the cap end plate 4, etc. If S 31 / S 30 If the area is less than 4%, the area of ​​the second solder mark 202 is smaller, the welding area between the tail body 22 and the cap end plate 4 is reduced, the internal resistance of the battery increases, and the overcurrent capacity at the corresponding welding position weakens, the battery temperature rises, and the battery performance is affected; if S31 / S 30 If the area of ​​the second solder mark 202 is greater than 5.6%, it will not only fail to improve the resistance of the battery, but will also increase the risk of poor soldering position, increase the defect rate of the soldering, increase the manufacturing cost of the battery, and decrease the soldering efficiency.

[0046] In some embodiments, S 2000 / S 20 =10%~20%, that is, the sum of the areas of multiple third solder marks 301 is 10%, 15%, or 20% of the area of ​​the negative electrode current collector 3, etc. If S 2000 / S 20 If the area is less than 10%, then the area of ​​multiple third solder marks 301 is too small, the welding area between the negative electrode current collector 3 and the negative electrode tab is reduced, the internal resistance of the battery increases, and the overcurrent capacity at the corresponding welding position weakens, the battery temperature rises, and the battery performance is affected; if S 2000 / S 20 If the area of ​​multiple third solder marks 301 is too large, the welding area between the negative electrode current collector 3 and the negative electrode tab will increase. This will not only fail to improve the resistance of the battery, but will also increase the risk of poor welding position, increase the welding defect rate, increase the battery manufacturing cost, and decrease the welding efficiency.

[0047] In some embodiments, S 100 / S 10 =3% to 6%, meaning the area of ​​a single first solder mark 201 is 3%, 4.5%, or 6% of the area of ​​the disk surface 21, etc. If S 100 / S 10 If the area is less than 3%, the area of ​​the first solder mark 201 is too small, and the welding area between the disk 21 and the positive electrode tab is small. This will not only affect the overall performance of the battery, but also increase its manufacturing cost; if S 100 / S 10 If the area is greater than 6%, the area of ​​the first solder mark 201 is too large, and the welding area between the plate 21 and the positive electrode tab is too large. This will not only fail to improve the resistance of the battery, but will also increase the risk of poor welding position, increase the welding defect rate, increase the battery manufacturing cost, and decrease the welding efficiency.

[0048] In some embodiments, S 31 =5mm 2 ~7mm 2 That is, the area of ​​the second solder mark 202 is 5mm². 2 6mm 2 or 7mm 2 Etc. If S 31 <5mm 2If the area of ​​the second solder mark 202 is smaller, the welding area between the tail body 22 and the cap end plate 4 is reduced, the internal resistance of the battery increases, and the overcurrent capacity at the corresponding welding position weakens, the battery temperature rises, and the battery performance is affected; if S 31 >7mm 2 If the area of ​​the second solder mark 202 is large, it will not only fail to improve the resistance of the battery, but will also increase the risk of poor soldering position, increase the defect rate of the soldering, increase the manufacturing cost of the battery, and decrease the soldering efficiency.

[0049] In some embodiments, S 200 / S 20 =3% to 5%, meaning the area of ​​a single third solder mark 301 is 3%, 4%, or 5% of the area of ​​the negative electrode current collector 3, etc. If S 200 / S 20 If the current density is less than 3%, the area of ​​the third solder mark 301 is too small, resulting in weakened overcurrent capacity, increased battery temperature, and negatively impacted battery performance; if S 200 / S 20 If the area is greater than 5%, the area of ​​the third solder mark 301 will be too large, and the welding area between the negative current collector 3 and the negative electrode tab will increase. This will not only fail to improve the resistance of the battery, but will also reduce the reliability of the welding quality.

[0050] Furthermore, S 100 / S 10 =4%~5%, S 1000 / S 10 =16%~20%, thus balancing the overall performance of the battery, welding quality and welding efficiency, and reducing the manufacturing cost of the battery.

[0051] Furthermore, the preferred option is S 1000 / S 10 =18%, S 31 / S 30 =4.8%, S 2000 / S 20 =15.9%.

[0052] In some embodiments, L 10 =4mm~6mm, W 10 =2mm~3mm, that is, the span of the first solder mark 201 along its length direction is 4mm, 5mm or 6mm, etc., and the span of the first solder mark 201 along its width direction is 2mm, 2.5mm or 3mm, etc. If L 10 If the span of the first solder mark 201 is less than 4mm, it will not only affect the welding strength between the plate 21 and the positive electrode tab, but also easily lead to concentrated heat generation, resulting in excessive temperature rise during battery rate operation; if L 10If the span is greater than 6mm, the first solder mark 201 will have an excessively large span along its length. This will not only make it easy for the soldering position to exceed the solderable area of ​​the disk surface 21, affecting the connection strength of the soldering position, but will also result in a longer current conduction path, affecting the battery's overcurrent performance; if W 10 If the span of the first solder mark 201 is less than 2mm, it will not only affect the welding strength between the plate 21 and the positive electrode tab, but also easily lead to concentrated heat generation, resulting in excessive temperature rise during battery rate operation; if W 10 If the span is greater than 3mm, the first solder mark 201 will have too large a span along its width direction. This will not only make it easy for the soldering position to exceed the solderable area of ​​the disk 21, affecting the connection strength of the soldering position, but will also cause the current conduction path to be too long, affecting the overcurrent performance of the battery.

[0053] Similarly, L 30 =3.5mm~4.5mm, W 30 =1mm~2mm, L 20 =3.5mm~5.5mm, W 20 =1.6mm~3.4mm, thus taking into account both the overall performance of the battery and the welding reliability of related components.

[0054] Furthermore, the preferred option is to let L 10 =5mm, W 10 =2.3mm, L 30 =4mm, W 30 =1.5mm, L 20 =4.5mm, W 20 =2.5mm.

[0055] In some embodiments, L 300 =5mm~7mm, R 10 = 8.5mm~9.6mm, R 20 = 8.5mm~10.5mm, R 30 =5.29mm~7.29mm, so that the positive current collector 2 and the negative current collector 3 can be adapted to conventional cylindrical lithium-ion batteries.

[0056] like Figure 3 As shown, the first solder mark 201 includes a plurality of parallel and spaced positive electrode solder lines 2011, such as... Figure 7 As shown, the third solder mark 301 includes multiple parallel and spaced negative electrode solder lines 3011, thereby improving the welding reliability of the welding position and ensuring the overall performance of the battery.

[0057] like Figure 4 As shown, the span of the bonding wire 2011 along its width direction is W. 102 ,like Figure 6 As shown, the line width of the second solder mark 202 is W. 301 ,like Figure 8 As shown, the linewidth of the negative electrode bonding wire 3011 is W. 203 .

[0058] In some embodiments, W 102 / W 10 =17%~27%, that is, the span of the solder line 2011 along its width direction is 17%, 22%, or 27% of the span of the first solder mark 201 along its width direction, etc. If W 102 / W 10 If the span is less than 17%, the span of the welding wire 2011 along its width direction is too small. This will not only cause insufficient connection strength but also lead to concentrated welding heat and welding bursts. Simultaneously, a small span will also cause excessive temperature rise in the battery at the rate of increase, affecting battery performance. If W... 102 / W 10 If the span is greater than 27%, the span of the welding line 2011 along its width direction is too large. This will not only make the welding position deviate from the weldable area on the disk 21, affecting the connection strength of the welding position, but will also cause the current conduction path to become longer, the internal resistance of the battery to increase, and the current flow of the battery to be uneven, thus affecting the performance of the battery.

[0059] In some embodiments, W 301 =0.2mm~0.4mm, that is, the line width of the second solder mark 202 is 0.2mm, 0.3mm or 0.4mm, etc. If W 301 If the line width is less than 0.2mm, the line width of the second solder mark 202 is too small, resulting in insufficient effective welding area between the tail body 22 and the cap end plate 4. This weakens the current carrying capacity, increases the temperature at the welding position, and affects the battery performance. Simultaneously, the small line width of the second solder mark 202 also leads to an increase in the battery's internal resistance. If W 301 If the line width is greater than 0.4mm, the line width of the second solder mark 202 will be too large, which will not only affect the aesthetics of the second solder mark 202, but also cause the heat to concentrate during welding, resulting in defects such as blasting and color changes at the welding position, and increasing the welding defect rate.

[0060] In some embodiments, W 203 =0.1mm~0.3mm, that is, the line width of the negative electrode bonding wire 3011 is 0.1mm, 0.2mm or 0.3mm, etc. If W 203 If the linewidth is less than 0.1mm, the negative electrode bonding wire 3011 is too small, resulting in a reduced current-carrying area at the bonding position, weakened current-carrying capacity, and increased temperature rise at the bonding position, affecting battery performance; if W 203 If the width is greater than 0.3mm, the line width of the negative electrode bonding wire 3011 is too large. This will not only fail to improve the resistance of the battery, but will also increase the risk of poor welding position and reduce the reliability of the welding.

[0061] Furthermore, W is preferred. 102=0.5mm, W 301 =0.3mm, W 203 =0.2mm, to balance the welding quality and welding efficiency of the battery.

[0062] 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 cylindrical lithium-ion battery, characterized in that: It includes a positive current collector (2), a negative current collector (3), and a cap end plate (4). The positive current collector (2) includes a plate surface (21) and a tail body (22). The plate surface (21) and the negative current collector (3) are respectively used to weld and fix to the positive and negative electrode tabs at both ends of the core (1). The tail body (22) is fixedly disposed on the plate surface (21) and welded and fixed to the cap end plate (4). The disk surface (21) is provided with a plurality of first solder marks (201), the first solder marks (201) being the welding trajectory between the disk surface (21) and the positive electrode tab; the radius of the disk surface (21) is R. 10 The area of ​​the disk (21) is S 10 The first solder mark (201) has a span of L along its length direction. 10 The first solder mark (201) has a span of W along its width direction. 10 The area of ​​one of the first solder marks (201) is S. 100 The sum of the area of ​​the plurality of the first solder marks (201) is S 1000 , among which, S 10 =π·R 10 2 S 100 =L 10 ·W 10 S 1000 / S 10 =12%~24%; The tail body (22) is provided with a second weld mark (202), which is the welding trajectory between the tail body (22) and the cap end plate (4); the radius of the cap end plate (4) is R. 30 The area of ​​the cap end plate (4) is S. 30 The second solder mark (202) has a span of L along its length direction. 30 The second solder mark (202) has a span of W along its width direction. 30 The area of ​​the second solder mark (202) is S. 31 , among which, S 30 =π·R 30 2 S 31 =L 30 ·W 30 S 31 / S 30 =4% to 5.6%; The negative electrode current collector (3) is provided with multiple third solder marks (301), which are the welding paths between the negative electrode current collector (3) and the negative electrode tab; the radius of the negative electrode current collector (3) is R. 20 The area of ​​the negative current collector (3) is S. 20 The third solder mark (301) has a span of L along its length direction. 20 The span of the third solder mark (301) along its width direction is W. 20 The area of ​​one of the third solder marks (301) is S. 200 The sum of the area of ​​the plurality of the third solder marks (301) is S. 2000 , among which, S 20 =π·R 20 2 S 200 =L 20 ·W 20 S 2000 / S 20 =10%~20%.

2. A cylindrical lithium-ion battery as described in claim 1, characterized in that: S 100 / S 10 =3%~6%,S 31 =5mm 2 ~7mm 2 ,S 200 / S 20 =3%~5%。 3. A cylindrical lithium-ion battery as described in claim 2, characterized in that: S 100 / S 10 =4%~5%,S 1000 / S 10 =16%~20%。 4. A cylindrical lithium-ion battery as described in claim 1, characterized in that: L 10 =4mm~6mm,W 10 =2mm~3mm。 5. A cylindrical lithium-ion battery as described in claim 4, characterized in that: L 30 =3.5mm~4.5mm,W 30 =1mm~2mm。 6. A cylindrical lithium-ion battery as described in claim 5, characterized in that: L 20 =3.5mm~5.5mm,W 20 =1.6mm~3.4mm。 7. A cylindrical lithium-ion battery as described in claim 1, characterized in that: The first solder mark (201) includes a plurality of parallel and spaced positive electrode solder lines (2011), the span of which is W along its width direction. 102 Among them, W 102 / W 10 =17% to 27%.

8. A cylindrical lithium-ion battery as described in any one of claims 1 to 7, characterized in that: The line width of the second solder mark (202) is W. 301 Among them, W 301 =0.2mm~0.4mm.

9. A cylindrical lithium-ion battery as described in any one of claims 1 to 7, characterized in that: The third solder mark (301) includes a plurality of parallel and spaced negative electrode solder lines (3011), the line width of which is W. 203 Among them, W 203 =0.1mm~0.3mm.

10. A cylindrical lithium-ion battery as described in any one of claims 1 to 7, characterized in that: The width of the tail body (22) is L 300 , where L 300 =5mm~7mm, R 10 = 8.5mm~9.6mm, R 20 = 8.5mm~10.5mm, R 30 =5.29mm~7.29mm.

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