A lithium-ion cylindrical secondary battery

Abstract

The utility model relates to cylindrical battery technical field, proposes a kind of lithium ion cylindrical secondary battery, including shell, positive pole, sealing sheet and upper plastic, the one end of shell is equipped with mounting hole;The positive pole includes intermediate part, outer rivet plate and inner rivet plate, the intermediate part is arranged in the mounting hole;The outer rivet plate and the inner rivet plate are integrally formed at the both ends of the intermediate part respectively, and the intermediate part, the outer rivet plate and the inner rivet plate are equipped with injection hole in;The sealing sheet is sealed and fixed in the injection hole;The upper plastic is arranged between the shell and the intermediate part and between the shell and the outer rivet plate;The radius of shell is R 10 , the ring width of outer rivet plate is L 33 , L 33 / R 10 =17.5%‑21.9%.The utility model can not only improve battery air-tightness reliability by reasonably limiting the specification of outer flanging, but also can improve the energy density of battery, and reduce the processing difficulty of battery, so as 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 lithium-ion cylindrical secondary battery. Background Technology

[0002] Lithium-ion rechargeable batteries have become a core power source for portable electronic devices, hybrid vehicles, and electric vehicles due to their significant advantages such as high operating voltage, high energy density, and long cycle life. Among them, cylindrical structures occupy an important market share due to their high mechanical strength, high production efficiency, and excellent space utilization.

[0003] The terminals are an important component of a cylindrical lithium-ion secondary battery, serving as a key part for the electrical connection between the battery and external circuitry. Terminals are typically fixed to the battery casing using riveting. By applying pressure, plastic deformation occurs between the terminal and the battery casing, creating a strong mechanical and electrical connection. During the riveting process, some material from the terminal is compressed and deformed, filling the corresponding riveting holes or areas on the battery casing to achieve a tight bond.

[0004] For example, the invention patent with publication number CN119764698A discloses a cylindrical battery positive electrode cover assembly, which has an injection hole on the positive electrode post and a sealing aluminum nail inside the injection hole to inject liquid into the battery. However, the opening of the injection hole directly affects the riveting force at the flange position of the positive terminal. The prior art does not limit the flange size of the positive terminal. If the flange size of the positive terminal is too small, the riveting force at the flange position of the positive terminal will decrease, which will lead to the battery's airtightness not being guaranteed. If the flange size of the positive terminal is too large, it will not only increase the manufacturing cost and weight of the battery and reduce the energy density of the battery, but also increase the processing difficulty of the battery and affect the processing efficiency of the battery. Utility Model Content

[0005] In view of this, this utility model proposes a cylindrical lithium-ion secondary battery. By reasonably limiting the specifications of the outer flange, the airtightness, energy density and processing efficiency of the battery can be taken into account, effectively improving the overall performance of the battery.

[0006] The technical solution of this utility model is implemented as follows: This utility model provides a cylindrical lithium-ion secondary battery, including a shell, a positive electrode post, a sealing sheet, and an upper plastic layer. One end of the shell is provided with a mounting hole. The positive electrode post includes a middle portion, an outer riveting plate, and an inner riveting plate. The middle portion is disposed within the mounting hole. The outer riveting plate and the inner riveting plate are integrally formed at both ends of the middle portion, and injection holes are provided within the middle portion, the outer riveting plate, and the inner riveting plate. The sealing sheet is sealed and fixed within the injection holes. The upper plastic layer is abutting between the shell and the middle portion, and between the shell and the outer riveting plate. The radius of the shell is R. 10 The circumferential width of the outer riveting plate is L. 33 L 33 / R 10 =17.5%-21.9%.

[0007] Based on the above technical solutions, preferably, the ring width of the middle part is L. 32 L 32 / R 10 =6.5%-10.9%.

[0008] Based on the above technical solutions, preferably, the annular width of the inner riveting plate is L. 31 L 31 / R 10 =45.6%-58.7%.

[0009] Based on the above technical solution, preferably, the circumference width of the inner rivet plate extending beyond the inner wall of the middle part is L. 311 L 311 / L 31 =30.4%-39.1%.

[0010] Based on the above technical solution, preferably, the circumferential width of the inner rivet plate extending beyond the circumferential position of the middle part is L. 312 L 312 / L 31 =43.5%-52.2%.

[0011] Based on the above technical solution, preferably, the injection hole includes a second groove, a third groove, and a fourth groove. The fourth groove is formed on the side of the inner rivet plate away from the outer rivet plate. The second groove, the third groove, and the fourth groove are coaxially arranged and sequentially connected, and the inner diameter of the second groove is larger than the inner diameter of the third groove. The sealing sheet is sealed and fixed in the second groove, and the side of the sealing sheet near the inner rivet plate abuts against the side of the second groove near the inner rivet plate. The radius difference between the second groove and the third groove is L. 321 L 321=0.43mm-0.63mm.

[0012] Based on the above technical solution, preferably, the injection hole further includes a first groove, which is formed on the side of the outer rivet plate away from the inner rivet plate and communicates with and is coaxially arranged with the second groove; the inner diameter of the first groove is larger than the inner diameter of the second groove, and the side of the sealing sheet away from the inner rivet plate is flush with the side of the first groove near the inner rivet plate; the radius difference between the first groove and the second groove is L. 331 L 331 =0.53mm-0.93mm.

[0013] Based on the above technical solutions, preferably, the overall height of the positive electrode post is H. 30 H 30 =2.8mm-4.8mm.

[0014] Based on the above technical solutions, preferably, the overall height of the outer riveting plate is H. 31 The overall height of the inner riveting plate is H. 32 H 31 =0.7mm-1.3mm, H 32 =0.7mm-1.3mm.

[0015] Based on the above technical solutions, the preferred option is R. 10 =21mm-25mm.

[0016] The lithium-ion cylindrical secondary battery of this invention has the following advantages over the prior art: (1) By reasonably limiting the specifications of the outer flange, not only can the airtightness and reliability of the battery be improved, but also the energy density of the battery can be increased and the processing difficulty of the battery can be reduced, thereby effectively improving the overall performance of the battery.

[0017] (2) By limiting the specifications and installation position of the positive electrode post and sealing sheet, the airtightness reliability, energy density and processing efficiency of the battery can be further balanced, and the short circuit risk of the battery can be reduced, thus improving the safety performance of the battery. Attached Figure Description

[0018] 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.

[0019] Figure 1This is a cross-sectional view of a lithium-ion cylindrical secondary battery according to the present invention.

[0020] Figure 2 This is a cross-sectional view of the positive electrode post in a cylindrical lithium-ion secondary battery according to the present invention.

[0021] Figure 3 This is a cross-sectional view of the upper plastic portion of a lithium-ion cylindrical secondary battery according to this utility model.

[0022] Figure 4 This is a cross-sectional view of the sealing sheet in a cylindrical lithium-ion secondary battery according to the present invention.

[0023] The components are: 1. Shell; 101. Mounting hole; 2. Positive electrode post; 21. Middle part; 22. Outer riveting plate; 23. Inner riveting plate; 201. Liquid injection hole; 2011. First groove; 2012. Second groove; 2013. Third groove; 2014. Fourth groove; 3. Sealing sheet; 4. Top plastic. Detailed Implementation

[0024] 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.

[0025] The present invention relates to a cylindrical lithium-ion secondary battery, comprising a casing 1, a positive electrode post 2, a sealing sheet 3, and an upper plastic layer 4.

[0026] The housing 1 is a cylindrical structure with an internal cavity. One end of the housing has a mounting hole 101. The middle position of the positive electrode post 2 is located inside the mounting hole 101, and the periphery of the positive electrode post 2 is spaced apart from the side wall of the mounting hole 101. The upper plastic 4 is abutting between the housing 1 and the positive electrode post 2. This not only achieves a sealed connection between the housing 1 and the positive electrode post 2 to prevent electrolyte leakage, but also prevents electrical connection between the housing 1 and the positive electrode post 2. When the housing 1 is connected to the negative terminal of the core inside the housing 1, and the positive electrode post 2 is connected to the positive terminal of the core inside the housing 1, the battery will not have a short circuit problem.

[0027] The positive electrode post 2 is fixed to the end of the housing 1 by a riveting process, such as... Figure 2As shown, the positive electrode post 2 includes a middle part 21, an outer riveting plate 22, and an inner riveting plate 23. The middle part 21 is disposed within the mounting hole 101, and the periphery of the middle part 21 is spaced apart from the inner wall of the mounting hole 101. The outer riveting plate 22 and the inner riveting plate 23 are integrally formed at both ends of the middle part 21, and the outer diameter of both the outer riveting plate 22 and the inner riveting plate 23 is larger than the inner diameter of the mounting hole 101. Figure 3 As shown, the upper plastic 4 is disposed between the outer riveting plate 22 and the housing 1 and between the middle part 21 and the housing 1, and a sealing ring and lower plastic are disposed between the inner riveting plate 23 and the housing 1, thereby realizing the fixed connection of the positive electrode post 2 on the housing 1, and the sealing and insulation effect between the positive electrode post 2 and the housing 1.

[0028] To ensure that the battery can efficiently and safely complete the electrolyte filling, such as Figure 1 and Figure 2 As shown, an injection hole 201 is provided inside the positive electrode post 2. The injection hole 201 extends through both ends of the positive electrode post 2 and is connected to the inside of the housing 1, so that electrolyte can be added to the inside of the housing 1 through the injection hole 201.

[0029] After the electrolyte injection is completed, the sealing plate 3 is sealed and fixed inside the injection hole 201, and the sealing plate 3 and the positive electrode post 2 are welded together so that the sealing plate 3 seals and plugs the injection hole 201, thereby keeping the cavity inside the shell 1 sealed and avoiding problems such as electrolyte leakage.

[0030] During the electrolyte injection process, in order to ensure that the electrolyte can fully wet the core, the electrolyte injected through the injection hole 201 needs to flow fully into the center hole of the core. That is, the inner diameter of the injection hole 201 near the core end is preferably not greater than the inner diameter of the center hole. To improve the convenience of electrolyte injection into the injection hole 201, it is preferable to enlarge the inner diameter of the injection hole 201 away from the core, for example, by setting the injection hole 201 into a conical or stepped structure with a wider outer diameter and a narrower inner diameter.

[0031] As a preferred embodiment, such as Figure 2 As shown, the injection hole 201 includes a first groove 2011, a second groove 2012, a third groove 2013, and a fourth groove 2014. The first groove 2011, the second groove 2012, the third groove 2013, and the fourth groove 2014 are connected in sequence, and the inner diameters of the first groove 2011, the second groove 2012, the third groove 2013, and the fourth groove 2014 decrease in sequence. The first groove 2011 is opened on the side of the outer riveting plate 22 away from the inner riveting plate 23, and the fourth groove 2014 is opened on the side of the inner riveting plate 23 away from the outer riveting plate 22. The sealing piece 3 is sealed and fixed in the second groove 2012.

[0032] like Figure 4As shown, in order to improve the installation stability and structural reliability of the sealing sheet 3 in the injection hole 201, it is preferable to make the side of the sealing sheet 3 near the core abut against the side of the second groove 2012 near the inner rivet plate 23, and make the side of the sealing sheet 3 away from the core flush with the side of the first groove 2011 near the inner rivet plate 23, that is, the thickness of the sealing sheet 3 is the depth of the second groove 2012; at the same time, since the sealing sheet 3 is not located in the first groove 2011, the end of the positive electrode post 2 away from the core is higher than the surface of the sealing sheet 3, which can also prevent the welding position of the sealing sheet 3 and the positive electrode post 2 from bulging outward and affecting the height of the battery.

[0033] like Figure 2 As shown, the inner ring position of the inner rivet plate 23 is used for welding with the positive current collector. By limiting the specifications of the first groove 2011, the second groove 2012, the third groove 2013 and the fourth groove 2014, the welding laser can be inserted into the third groove 2013 to weld the inner ring position of the inner rivet plate 23.

[0034] like Figure 2 As shown, the arrangement of the first groove 2011, the second groove 2012, the third groove 2013, and the fourth groove 2014 results in the middle part 21, the outer riveting plate 22, and the inner riveting plate 23 forming ring structures of different specifications. In order to ensure the symmetry and stability of the battery, it is preferable that the first groove 2011, the second groove 2012, the third groove 2013, the fourth groove 2014, the middle part 21, the outer riveting plate 22, and the inner riveting plate 23 are all coaxially arranged with the housing 1.

[0035] like Figures 1-4 As shown, the radius of shell 1 is R. 10 The ring width of the inner riveting plate 23 is L. 31 The width of the ring in the middle part 21 is L. 32 The ring width of the outer riveting plate 22 is L. 33 The circumference of the inner rivet 23 extending from the inner wall of the middle part 21 is L. 311 The circumference of the inner rivet plate 23 extending beyond the middle part 21 is L. 312 The radius difference between the second groove 2012 and the third groove 2013 is L. 321 The radius difference between the first groove 2011 and the second groove 2012 is L. 331 The overall height of the positive electrode post 2 is H. 30 The overall height of the outer riveting plate 22 is H. 31 The overall height of the inner riveting plate 23 is H. 32 .

[0036] In some embodiments, R 10 =21mm-25mm, that is, the radius of shell 1 is 21mm, 23mm or 25mm, etc.

[0037] In some embodiments, L 33 / R 10 =17.5%-21.9%, meaning the ring width of the outer riveting plate 22 is 17.5%, 19.7%, or 21.9% of the radius of the shell 1, etc. If L 33 / R 10 If the Rim width is less than 17.5%, the ring width of the outer riveting plate 22 is too small, the riveting force of the outer riveting plate 22 decreases, the positive electrode post 2 is prone to torsion, and the airtightness of the battery cannot be guaranteed; if L 33 / R 10 If the circumference is greater than 21.9%, the circumference of the outer riveting plate 22 will be too large. This will not only increase the manufacturing cost and weight of the positive electrode post 2 and reduce the energy density of the battery, but also increase the riveting difficulty of the outer riveting plate 22, resulting in a decrease in battery yield.

[0038] In some embodiments, L 32 / R 10 =6.5%-10.9%, meaning the ring width of the middle part 21 is 6.5%, 8.7%, or 10.9% of the radius of the shell 1, etc. If L 32 / R 10 If L < 6.5%, the ring width of the middle part 21 is too small, the structural strength of the positive electrode post 2 cannot be guaranteed, and the positive electrode post 2 is prone to deformation during battery use, thus compromising the battery's sealing reliability; if L 32 / R 10 If the density is greater than 10.9%, the ring width of the middle part 21 will be too large, increasing the manufacturing cost and weight of the positive electrode post 2, which will lead to a decrease in the energy density of the battery.

[0039] In some embodiments, L 31 / R 10 =45.6%-58.7%, meaning the ring width of the inner riveting plate 23 is 45.6%, 50%, or 58.7% of the radius of the housing 1, etc. The inner riveting plate 23 is not only used for compression sealing of the sealing ring and lower plastic to prevent them from falling off, but also for welding to the positive current collector. If L 31 / R 10 If the circumference is less than 45.6%, then the ring width of the inner riveting plate 23 is too small. Firstly, the supporting effect of the inner riveting plate 23 on the lower plastic and sealing ring is weakened, which not only compromises the airtightness at the positive electrode post 2 but also makes the lower plastic prone to detachment, causing compression of the core and increasing the risk of short circuit in the battery. Secondly, if the welding area between the inner riveting plate 23 and the positive current collector is too small, it will not only increase the welding difficulty between the inner riveting plate 23 and the positive current collector but also reduce the welding reliability, affecting the overall performance of the battery. If L 31 / R 10If the width of the inner rivet plate 23 is too large, the manufacturing cost and weight of the positive electrode post 2 will increase, resulting in a decrease in the energy density of the battery.

[0040] In some embodiments, L 311 / L 31 =30.4%-39.1%, meaning the circumference width of the inner riveting plate 23 extending beyond the inner wall of the middle part 21 is 30.4%, 34.8%, or 39.1% of the circumference width of the inner riveting plate 23, etc. If L 311 / L 31 If L < 30.4%, then the circumference of the inner riveting plate 23 extending from the inner wall of the middle part 21 is too small, meaning the welding area on the inner riveting plate 23 for welding with the positive current collector is too small, making it difficult to position the welding laser and increasing the welding difficulty between the positive electrode post 2 and the positive current collector; if L 311 / L 31 If the width of the ring extending from the inner wall of the middle part 21 on the inner rivet plate 23 is too large, the manufacturing cost and weight of the positive electrode post 2 will increase, resulting in a decrease in the energy density of the battery.

[0041] In some embodiments, L 312 / L 31 =43.5%-52.2%, meaning the circumferential width of the inner riveting plate 23 extending beyond the middle portion 21 is 43.5%, 47.8%, or 52.2% of the circumferential width of the inner riveting plate 23, etc. If L 312 / L 31 If the Rivet width is less than 43.5%, the circumference of the inner rivet plate 23 extending beyond the middle part 21 is too small. This weakens the supporting effect of the inner rivet plate 23 on the lower plastic and the sealing ring, not only compromising the airtightness of the positive electrode post 2 but also causing the lower plastic to easily detach, compressing the core and increasing the risk of a short circuit in the battery. If L 312 / L 31 If the width of the inner rivet plate 23 is greater than 52.2%, the ring width extending from the middle part 21 around the inner rivet plate 23 will be too large, increasing the manufacturing cost and weight of the positive electrode post 2 and causing the energy density of the battery to decrease.

[0042] In some embodiments, L 321 =0.43mm-0.63mm, meaning the radius difference between the second groove 2012 and the third groove 2013 is 0.43mm, 0.53mm, or 0.63mm, etc. If L 321 If the radius difference between the second groove 2012 and the third groove 2013 is less than 0.43mm, the area on the positive electrode post 2 used to support the sealing sheet 3 is too small. During assembly, the sealing sheet 3 is easily pressed into the third groove 2013, leading to a decrease in assembly yield and affecting battery processing efficiency. If L 321If the radius difference between the second groove 2012 and the third groove 2013 is too large, the inner diameter of the second groove 2012 will increase while keeping the inner diameter of the third groove 2013 unchanged. This will cause the outer diameter of the outer rivet plate 22 to increase accordingly, which in turn will increase the manufacturing cost and weight of the positive electrode post 2 and reduce the energy density of the battery.

[0043] In some embodiments, L 331 =0.53mm-0.93mm, meaning the radius difference between the first groove 2011 and the second groove 2012 is 0.53mm, 0.73mm, or 0.93mm, etc. If L 331 If the radius difference between the first groove 2011 and the second groove 2012 is less than 0.53mm, the welding position between the sealing sheet 3 and the inner wall of the second groove 2012 will move outward, causing the sealing sheet 3 to be directly welded to the upper end of the positive electrode post 2, increasing the total height of the battery; if L 331 If the radius difference between the first groove 2011 and the second groove 2012 is too large, the structural strength and riveting force of the outer riveting plate 22 will decrease, the positive electrode post 2 will twist during use, and the airtightness of the battery will not be guaranteed.

[0044] In some embodiments, H 30 =2.8mm-4.8mm, meaning the overall height of the positive electrode post 2 is 2.8mm, 3.8mm, or 4.8mm, etc. If H 30 If the height is less than 2.8mm, the overall height of the positive electrode post 2 is too small, resulting in weakened riveting force between the positive electrode post 2 and the upper plastic 4, sealing ring, and lower plastic, thus compromising the airtightness of the battery; if H 30 If the height is greater than 4.8mm, the overall height of the positive electrode post 2 will be too large, increasing the manufacturing cost and weight of the battery and causing a decrease in the battery's energy density.

[0045] In some embodiments, H 31 =0.7mm-1.3mm, meaning the overall height of the outer riveting plate 22 is 0.7mm, 1mm, or 1.3mm, etc. If H 31 If the height is less than 0.7mm, the overall height of the outer riveting plate 22 is too small, its riveting force is weakened, and thus the airtightness of the battery cannot be guaranteed; if H 31 If the height is greater than 1.3mm, the overall height of the outer riveting plate 22 will be too large, increasing the manufacturing cost and weight of the battery and causing a decrease in the battery's energy density.

[0046] In some embodiments, H 32 =0.7mm-1.3mm, meaning the overall height of the inner riveting plate 23 is 0.7mm, 1mm, or 1.3mm, etc. If H 32If the height is less than 0.7mm, the overall height of the inner riveting plate 23 is too small, its riveting force is weakened, and thus the airtightness of the battery cannot be guaranteed; if H 32 If the height is greater than 1.3mm, the overall height of the inner riveting plate 23 will be too large, increasing the manufacturing cost and weight of the battery and causing a decrease in the battery's energy density.

[0047] 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 secondary battery, characterized in that: It includes a housing (1), a positive electrode post (2), a sealing sheet (3), and an upper plastic layer (4), wherein, One end of the housing (1) is provided with a mounting hole (101); The positive electrode post (2) includes a middle part (21), an outer riveting plate (22) and an inner riveting plate (23). The middle part (21) is disposed in the mounting hole (101). The outer riveting plate (22) and the inner riveting plate (23) are integrally formed at both ends of the middle part (21), and the middle part (21), the outer riveting plate (22) and the inner riveting plate (23) are provided with liquid injection holes (201). The sealing sheet (3) is sealed and fixed inside the injection hole (201); The upper plastic (4) is abutting between the housing (1) and the middle part (21) and between the housing (1) and the outer riveting plate (22); The radius of the shell (1) is R. 10 The circumferential width of the outer riveting plate (22) is L. 33 L 33 / R 10 =17.5%-21.9%.

2. A lithium-ion cylindrical secondary battery as described in claim 1, characterized in that: The ring width of the middle part (21) is L. 32 L 32 / R 10 =6.5%-10.9%.

3. A lithium-ion cylindrical secondary battery as described in claim 1, characterized in that: The circumferential width of the inner rivet plate (23) is L. 31 L 31 / R 10 =45.6%-58.7%.

4. A lithium-ion cylindrical secondary battery as described in claim 3, characterized in that: The circumference of the inner rivet plate (23) extending out of the inner wall of the middle part (21) is L. 311 L 311 / L 31 =30.4%-39.1%.

5. A lithium-ion cylindrical secondary battery as described in claim 4, characterized in that: The circumference of the inner rivet plate (23) extending beyond the periphery of the middle portion (21) is L. 312 L 312 / L 31 =43.5%-52.2%.

6. A lithium-ion cylindrical secondary battery as described in claim 1, characterized in that: The injection hole (201) includes a second groove (2012), a third groove (2013), and a fourth groove (2014). The fourth groove (2014) is located on the side of the inner rivet plate (23) away from the outer rivet plate (22). The second groove (2012), the third groove (2013), and the fourth groove (2014) are coaxially arranged and connected in sequence. The inner diameter of the second groove (2012) is larger than the inner diameter of the third groove (2013). The sealing piece (3) is sealed and fixed in the second groove (2012), and the side of the sealing piece (3) near the inner rivet plate (23) abuts against the side of the second groove (2012) near the inner rivet plate (23). The radius difference between the second groove (2012) and the third groove (2013) is L. 321 L 321 =0.43mm-0.63mm.

7. A lithium-ion cylindrical secondary battery as described in claim 6, characterized in that: The injection hole (201) further includes a first groove (2011), which is formed on the side of the outer rivet plate (22) away from the inner rivet plate (23) and communicates with and is coaxially arranged with the second groove (2012); the inner diameter of the first groove (2011) is larger than the inner diameter of the second groove (2012), and the side of the sealing sheet (3) away from the inner rivet plate (23) is flush with the side of the first groove (2011) close to the inner rivet plate (23); The radius difference between the first groove (2011) and the second groove (2012) is L. 331 L 331 =0.53mm-0.93mm.

8. A lithium-ion cylindrical secondary battery as described in claim 1, characterized in that: The overall height of the positive electrode post (2) is H. 30 H 30 =2.8mm-4.8mm.

9. A lithium-ion cylindrical secondary battery as described in claim 1, characterized in that: The overall height of the outer riveting plate (22) is H. 31 The overall height of the inner riveting plate (23) is H. 32 H 31 =0.7mm-1.3mm, H 32 =0.7mm-1.3mm.

10. A lithium-ion cylindrical secondary battery as described in any one of claims 1-9, characterized in that: R 10 =21mm-25mm。

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