Cap assembly and cylindrical lithium ion battery

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a cap assembly and a cylindrical lithium ion battery, the cap assembly comprises a lower end plate, the lower end plate is of a circular plate-shaped structure, and the lower end plate is provided with a protruding part; one face of the inner rubber ring abuts against the lower end plate and surrounds the protruding part; the anti-explosion piece abuts against the other face of the inner rubber ring, and the anti-explosion piece is provided with a sinking part abutting against the protruding part; the section of the sinking part is of a trapezoidal structure, and the width W1 of the end, abutting against the protruding part, of the sinking part ranges from 1.5 mm to 3.5 mm. The width of one end, abutting against the sinking part, of the protruding part is W11, and W1 / W11 = 76-96%. According to the utility model, by reasonably arranging the structures of the lower end plate and the explosion-proof sheet, the protruding part and the sinking part can be in better contact, so that the convenience of welding can be improved, and the problems of explosion points, insufficient welding and the like can be reduced as much as possible, thereby effectively improving the welding yield and controlling the manufacturing cost of the battery.

Description

Technical Field

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

[0002] Cylindrical batteries are a very common energy storage component. With the development of new energy technologies, the production process of cylindrical batteries is also constantly improving. Among them, the safety of cylindrical batteries is particularly important, so related safety structures have been improved, which can effectively ensure personal and property safety.

[0003] A patent (publication number CN119518186A) discloses a large cylindrical battery with a PACK-compatible side-welded grooved sealing structure, which includes multiple battery bodies and modules. The battery body is provided with a grooved sealing, a cap, a steel shell, a grooved end height, a cap explosion-proof sheet, a cap rubber ring, and a PACK connecting piece. The steel shell is wrapped around the outside of the battery body, the cap is located on the top of the steel shell, the cap explosion-proof sheet is located on the inside of the steel shell, the grooved end height is located on the top of the outer side of the grooved sealing, and the cap rubber ring is located on the inside of the grooved end height.

[0004] In the above scheme, the middle part of the explosion-proof sheet rests against the lower end plate of the battery. In the existing cylindrical battery cap structure, the middle part of the explosion-proof sheet is generally welded directly to the middle part of the lower end plate. Since the middle area of ​​the explosion-proof sheet is large and the welding area is large, it is difficult to control the flatness of the welding. During the welding process, explosion points and incomplete welds are prone to occur, which leads to an increase in the welding defect rate and an increase in battery manufacturing costs.

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

[0006] To address the shortcomings of existing technologies, this utility model provides a cap assembly and a cylindrical lithium-ion battery. By rationally designing the structure of the lower end plate of the explosion-proof tablet, the welding yield can be effectively guaranteed, thereby solving the problems of explosion points and incomplete welds in existing cap assemblies, which lead to increased production defect rates and consequently increased production costs.

[0007] This utility model provides a cap assembly, including:

[0008] The lower end plate has a circular plate structure and a protrusion.

[0009] The inner rubber ring has one side abutting against the lower end plate and surrounding the protrusion;

[0010] The explosion-proof sheet supports the other side of the inner rubber ring, and the explosion-proof sheet is provided with a recessed part to support the protrusion;

[0011] The recessed section has a trapezoidal structure, and the width of the recessed section abutting the protruding end is W1 = 1.5mm to 3.5mm; the width of the protruding end abutting the recessed section is W11, where W1 / W11 = 76 to 96%.

[0012] In some embodiments, an outer insulating ring is also included, which surrounds the explosion-proof sheet. The inner diameter of the outer insulating ring is W0, wherein the ratio of the width of the recessed portion abutting one end of the protrusion to the inner diameter of the outer insulating ring is W1 / W0 = 8% to 18%.

[0013] In some embodiments, the thickness of the recessed portion is H43, and the thickness of the explosion-proof sheet at the recessed portion is H40, wherein H43 / H40 = 32% to 48%. In some embodiments,

[0014] In some embodiments, the explosion-proof sheet is provided with a central groove, the depth of which is H45;

[0015] The ratio of the depth of the center groove to the thickness of the recessed part of the explosion-proof sheet is H45 / H40 = 12% to 26%.

[0016] In some embodiments, the edge of the inner rubber ring 2 surrounds the lower end plate 1, and the cross-sectional width of the lower end plate 1 is L0;

[0017] The width of the protrusion 11 abutting against one end of the recessed portion 31 is W11 / L0 = 18% to 30% of the cross-sectional width of the lower end plate 1.

[0018] In some embodiments, the thickness of the protrusion is H2, and the thickness of the portion of the lower end plate without the protrusion is H22, wherein H2 / H22 = 28% to 40%.

[0019] In some embodiments, a groove is formed on the protrusion, the depth of the groove is H1, and the ratio of the depth of the groove to the thickness of the protrusion is H1 / H2 = 55% to 75%.

[0020] In some embodiments, the distance between the edge of the protrusion and the center of the groove is L21, and the ratio of L21 / W11 to the width of the end of the recessed portion connected to the explosion-proof sheet is L21 / W11 = 8% to 18%.

[0021] In some embodiments, the protrusion partially abuts against the recessed portion, and the protrusion has blank areas on both sides, the width of which is L60 = 0.15mm to 0.25mm.

[0022] On the other hand, this utility model provides a cylindrical lithium-ion battery, including the above-mentioned cap assembly.

[0023] Based on the above technical solution, this utility model, by reasonably setting the structure of the lower end plate and the explosion-proof sheet, enables the protruding part and the sunken part to achieve better contact, which not only improves the convenience of welding, but also minimizes problems such as explosion points and incomplete welding, thereby effectively improving the welding yield and controlling the battery manufacturing cost. Attached Figure Description

[0024] 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:

[0025] Figure 1 This is a cross-sectional view of the cap assembly of this utility model;

[0026] Figure 2 This is a schematic diagram showing the dimensions of the cap assembly of this utility model;

[0027] Figure 3 This is an enlarged view of the contact structure between the protruding part and the recessed part of the cap assembly of this utility model;

[0028] Figure 4 This is a structural diagram showing the assembly of the lower end plate, inner rubber ring, and explosion-proof sheet of the cap assembly of this utility model.

[0029] Figure 5 This is a structural diagram showing the lower end plate of the cap assembly of this utility model mating with the explosion-proof sheet;

[0030] Figure 6 This is a structural diagram of the explosion-proof sheet of the cap assembly of this utility model;

[0031] Figure 7 This is a structural diagram of the lower end plate of the cap assembly of this utility model;

[0032] Figure 8 This is a structural diagram showing the fit between the protruding part and the recessed part of the cap assembly of this utility model;

[0033] In the picture:

[0034] 1. Lower end plate; 11. Protrusion; 101. Groove;

[0035] 2. Inner rubber ring;

[0036] 3. Explosion-proof sheet; 31. Recessed section; 301. Center groove;

[0037] 4. Outer insulating ring;

[0038] 5. Top cover plate; Detailed Implementation

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] As attached Figures 1 to 8 As shown, in one illustrative embodiment of the cap assembly of this utility model, it includes a lower end plate 1, an inner rubber ring 2, an explosion-proof sheet 3, and an outer insulating ring 4;

[0044] The present invention relates to a cylindrical lithium-ion battery, which includes the aforementioned cap assembly and a top cover plate 5.

[0045] As attached Figures 1 to 7As shown, the lower end plate 1 has a circular plate structure and a protrusion 11; the inner rubber ring 2 has one side abutting against the lower end plate 1 and surrounding the protrusion 11; the explosion-proof sheet 3 abuts against the other side of the inner rubber ring 2 and has a recessed portion 31 that abuts against the protrusion 11; the recessed portion 31 has a trapezoidal cross-section and the width of the recessed portion 31 abutting against the protrusion 11 is W1 = 1.5mm to 3.5mm; the width of the protrusion 11 abutting against the recessed portion 31 is W11, where W1 / W11 = 76% to 96%.

[0046] As described above, the sunken portion 31 of the explosion-proof sheet 3 is welded to the protruding portion 11 of the lower end plate 1 to ensure the stability of the connection structure. In the event of battery thermal runaway, the contents of the battery can break through the protruding portion 11 and the sunken portion 31 to achieve pressure relief and exhaust, thereby preventing the battery from exploding.

[0047] In this structure, W1 / W11 = 76-96%, specifically, W1 is 1.5mm-3.5mm and W11 is 2mm-4mm.

[0048] If the ratio of W1 / W11 is too small, then the corresponding W1 is too small and W11 is too large. This will compress the effective welding area, resulting in a reduction in the effective welding area of ​​the contact surface between the protrusion 11 and the recessed part 31. This will lead to a decrease in the welding current carrying capacity, heat generation at the welding point, and an increase in the internal temperature of the battery, which will affect the performance of the battery.

[0049] If the ratio of W1 / W11 is too large, then the corresponding W1 will be too large and W11 will be too small. This will cause the diameter of the CID power-off groove to decrease. At the same time, the flatness of the connection between the protrusion 11 and the recess 31 will be difficult to control, which will cause problems such as poor soldering and missing soldering, affecting the reliability of the welding.

[0050] This structure, by precisely controlling the proportions of the protrusion 11 and the recessed portion 31, can effectively improve production yield while ensuring structural stability, thereby reducing production costs.

[0051] like Figure 1 and Figure 2 As shown, the outer insulating ring 4 surrounds the explosion-proof sheet 3. The inner diameter of the outer insulating ring 4 is W0. The ratio of the width of the recessed part 31 abutting against one end of the protrusion 11 to the inner diameter of the outer insulating ring 4 is W1 / W0 = 8% to 18%.

[0052] In this structure, W1 / W0 = 8% to 18%, specifically, W0 is 15mm to 25mm and W1 is 1.5mm to 3.5mm.

[0053] If the ratio of W1 / W0 is too small, W1 will become smaller. However, the sinking part 31 abuts against one end of the protrusion 11, and the protrusion 11 abuts against one end of the sinking part 31 are used for welding to achieve a reliable connection. If W1 becomes very small, it will compress the effective welding area, resulting in a reduction in the weldable area, which will affect the overcurrent capacity and raise the internal temperature of the battery, thus affecting the battery performance.

[0054] If the W1 / W0 ratio is too large, W1 will become larger. Since the flatness of the welding surface needs to be ensured during welding, if W1 is too large, the flatness will be difficult to control, which will cause problems such as incomplete welding and missing welding, and reduce the reliability of welding.

[0055] like Figure 3 As shown, the thickness of the recessed portion 31 is H43, and the thickness of the explosion-proof sheet 3 at the recessed portion 31 is H40, wherein H43 / H40 = 32%~48%;

[0056] The explosion-proof sheet 3 is provided with a central groove 301, the depth of which is H45; the ratio of the depth of the central groove 301 to the thickness at the recessed part 31 of the explosion-proof sheet 3 is H45 / H40 = 12%~26%.

[0057] As shown in the above structure, H43 / H40 = 32%~48%, H45 / H40 = 12%~26%, where H43 is 0.1mm~0.3mm, H40 is 0.4mm~0.6mm, and H45 is 0.04mm~0.14mm;

[0058] If the H43 / H40 ratio is too small, the thickness of the recessed part 31 will be reduced accordingly, making it easy to weld through when welding the recessed part 31 and the protruding part 11. During battery cycling, due to internal gas generation, the internal pressure of the battery increases, and the welded part is prone to leakage, affecting the normal application of the battery. If the equipment power is reduced to reduce the welding time, problems such as poor welding and missing welding will occur.

[0059] If the H43 / H40 ratio is too large, the thickness of the recessed part 31 will increase accordingly, which will occupy the internal space of the battery, reduce the battery capacity, and reduce the energy density.

[0060] If the H45 / H40 ratio is too small, then H45 is too small and H40 is too large. If the depth of the center groove 301 is too small, it will increase the manufacturing difficulty and will not be able to reduce stress concentration. The explosion-proof sheet 3 is formed by the surrounding material being thinned and squeezed, and has a high density. The stress concentration is more obvious. The valve opening pressure of the explosion-proof sheet 3 is unstable. If the stress is not reduced, it will not be able to play a normal valve opening role, which will affect the safety of the battery.

[0061] If the H45 / H40 ratio is too large, resulting in excessively high H45 and low H40, the battery will be prone to burn-through during welding. During battery cycling, the internal pressure increases due to gas generation, making the burn-through area susceptible to leakage. Reducing the welding time and equipment power can lead to incomplete or missing welds. Furthermore, an excessively high H45 weakens the structural strength of the explosion-proof sheet 3, making it prone to deformation. Normal gas generation inside the battery can easily cause the explosion-proof sheet 3 to open, affecting the normal use of the battery.

[0062] like Figure 2 and Figure 4 As shown, the inner rubber ring 2 surrounds the lower end plate 1, and the cross-sectional width of the lower end plate 1 is L0; the width of the protrusion 11 abutting against one end of the recessed part 31 is W11 / L0 = 18%~30% to the cross-sectional width of the lower end plate 1.

[0063] As described above, W11 / L0 = 18%–30%, where W11 is 2.4 mm–3.5 mm and L0 is 11.3 mm–13.3 mm.

[0064] If the W11 / L0 ratio is too small, then W11 will be too small, and the end face area of ​​the protrusion 11 will be reduced accordingly. This will reduce the welding area between the protrusion 11 and the recessed part 31, resulting in reduced welding reliability. Furthermore, if there is not enough welding area, the flow area at the welding point will be reduced, and the temperature at the welding point will rise, affecting the battery performance.

[0065] If the W11 / L0 ratio is too large, then W11 will be too large, and the end face area of ​​the corresponding protrusion 11 will increase, which will increase the difficulty of the manufacturing process and make it more difficult to control the flatness at this point. Poor flatness control can easily lead to problems such as blasting and incomplete welding when the protrusion 11 is welded to the sinker, as well as production efficiency. Secondly, it will reduce the strength of the lower end plate 1, making it prone to deformation and causing unstable CID voltage cut-off pressure.

[0066] like Figure 3 As shown, the thickness of the protrusion 11 is H2, and the thickness of the portion of the lower end plate 1 without the protrusion 11 is H22, wherein H2 / H22 = 28% to 40%;

[0067] As described above, H2 / H22 = 28%–40%, where H2 is 0.10–0.25 mm and H22 is 0.4 mm–0.6 mm.

[0068] If the ratio is too small, since the thickness H2 of the protrusion 11 is a fixed value, the corresponding H22 will be too large. First, it will cause difficulties in the manufacturing process of the lower end plate 1, increase the difficulty coefficient, and affect the production efficiency, resulting in low mass production efficiency. Second, it will occupy the internal space of the battery, causing the battery capacity to decrease.

[0069] If the ratio is too large, the corresponding H22 will be too small, and there will be no excess material to squeeze out and form the protrusion 11 of the lower end plate 1. As a result, it will be difficult to control the flatness and weld the sunken part 31 of the explosion-proof sheet 3, which will easily lead to problems such as welding explosions and incomplete welds, and reduce the reliability of the welding.

[0070] like Figures 1-3 As shown, a groove 101 is provided on the protrusion 11. The depth of the groove 101 is H1. The ratio of the depth of the groove 101 to the thickness of the protrusion 11 is H1 / H2 = 55% to 75%.

[0071] As shown in the above structure, H1 / H2 = 55% to 75%, where H1 is 0.07 mm to 0.15 mm and H2 is 0.14 mm to 0.24 mm;

[0072] If the range is too small, the depth H1 of the corresponding groove 101 will be too small, and the residual thickness at the etched area will become thicker, increasing the pressure value required to cut off the power. When a large amount of gas is generated inside the battery, the gas pressure cannot tear the protection mechanism at the CID to form a power-off protection, thus increasing the safety risk of the battery.

[0073] Specifically, two grooves 101 are provided, and the area between the two grooves 101 is the CID power-off zone. When the battery thermally runs away, this part is torn to achieve power disconnection.

[0074] If the ratio is too large, then H1 will be too large, which will reduce the corresponding residual thickness. This will reduce the CID voltage cutoff pressure. When the battery is generating gas, the pressure of the generated gas can tear the CID, forming an open circuit and causing the battery to fail.

[0075] Furthermore, if the range is too large, H1 will be too large, and the mechanical strength of the protrusion on the lower end cover 1 will be reduced. When assembled with the outer insulating ring 4, the cap will be squeezed and will spread towards the center of the shaft due to deformation, which may cause it to squeeze the lower end plate 1 assembly and affect the overall sealing of the battery.

[0076] like Figure 2 and Figure 3 As shown, the distance between the edge of the protrusion 11 and the center of the groove 101 is L21, and the ratio of L21 to the width of the end of the recessed part 31 connected to the explosion-proof plate 3 is L21 / W11 = 8% to 18%.

[0077] As described above, L21 / W11 = 8% to 18%, where L21 is 0.3mm to 0.5mm and W11 is 2.4mm to 3.5mm.

[0078] If the L21 / W11 ratio is too small, then L21 is too small and W11 is too large. L21 is the corresponding CID power-off structure of the cap. By tearing off the remaining thickness at the groove 101, the battery can form a power-off protection. However, because the distance of L21 is too small and too close to the edge R corner, stress concentration occurs, the power-off pressure increases, the battery is not easy to disconnect, and the battery safety performance deteriorates.

[0079] If the L21 / W11 ratio is too large, then the corresponding L21 is too large and W11 becomes small. Since the protrusion 11 and the recessed part 31 are welded, in order not to affect the CID power-off effect and capability, and to achieve the power-off effect, the solder is generally welded in the area from the CID power-off groove 101 to the center of the shaft. Since L21 becomes larger, the welding area will be reduced, resulting in a decrease in welding reliability. Furthermore, without sufficient welding area, the current flow area at the welding point will be reduced, and the temperature at the welding point will rise, affecting the battery performance.

[0080] like Figure 2 and Figure 8 As shown, the protrusion 11 partially abuts against the recessed portion 31, and the protrusion 11 has blank areas on both sides, the width of which is L60 = 0.15mm to 0.25mm;

[0081] As described above, L60 = 0.15mm~0.25mm;

[0082] If the range is too small, there will be a certain degree of eccentricity when the explosion-proof sheet 3 and the lower end plate 1 are assembled, and the concentricity will not be 0. If the range is too small after a certain reasonable eccentricity, the sinking part 31 and the protruding part 11 will be affected by the eccentricity problem, which will affect the welding area, the welding flow area, the heat generated in the welding area, and the safety performance of the battery.

[0083] If the range is too large, the area of ​​the protrusion 11 will increase, which will increase the difficulty of the process and make it more difficult to control the flatness at this point. Poor flatness control will cause problems such as blasting and poor welding at the welding point between the protrusion 11 and the recessed part 31, affecting production efficiency. Secondly, it will reduce the strength of the lower end plate 1, making it prone to deformation and causing unstable CID voltage cut-off pressure.

[0084] Through the description of several embodiments of the current collector welding structure of this utility model, it can be seen that the embodiments of this cap assembly have at least one or more of the following advantages:

[0085] 1. By reasonably setting the appropriate ratio between the sunken part 31 in the explosion-proof sheet 3 and the protruding part 11 in the lower end plate 1, the explosion-proof sheet 3 and the lower end plate 1 can achieve better contact, which is conducive to ensuring the stability of welding, thereby achieving good electrical connection and ensuring the yield of battery production.

[0086] 2 By controlling the parameters of the lower end plate 1 and the explosion-proof sheet 3, especially the parameters of the protrusion 11 and the recessed part 31, problems such as missing welds and false welds at the welding joints can be effectively eliminated, which further improves the yield of finished products and improves the application performance.

[0087] 3 By controlling the relevant parameters of the groove 101 and the center groove 301, the stability of the valve opening structure can be guaranteed, and the processing convenience can be ensured, thereby making the battery application reliable and ensuring the safety of battery use.

[0088] 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.

[0089] 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 cap assembly, characterized in that, include: The lower end plate (1) has a circular plate structure and is provided with a protrusion (11); Inner rubber ring (2), one side of which abuts against the lower end plate (1) and surrounds the protrusion (11); An explosion-proof sheet (3) abuts against the other side of the inner rubber ring (2), and the explosion-proof sheet (3) is provided with a recessed part (31) abutting against the protrusion (11); The recessed portion (31) has a trapezoidal cross-section, and the width of the recessed portion (31) abutting against one end of the protrusion (11) is W1 = 1.5mm to 3.5mm; The width of the protrusion (11) abutting against one end of the recessed portion (31) is W11, wherein W1 / W11 = 76-96%.

2. The cap assembly according to claim 1, characterized in that, It also includes an outer insulating ring (4) that surrounds the explosion-proof sheet (3). The inner diameter of the outer insulating ring (4) is W0. The ratio of the width of the recessed portion (31) abutting one end of the protrusion (11) to the inner diameter of the outer insulating ring (4) is W1 / W0 = 8% to 18%.

3. The cap assembly according to claim 1 or 2, characterized in that, The thickness of the recessed portion (31) is H43, and the thickness of the explosion-proof sheet (3) at the recessed portion (31) is H40, wherein H43 / H40 = 32%~48%.

4. The cap assembly according to claim 3, characterized in that, The explosion-proof sheet (3) is provided with a central groove (301), the depth of which is H45; The ratio of the depth of the central groove (301) to the thickness of the explosion-proof sheet (3) at the recessed portion (31) is H45 / H40 = 12% to 26%.

5. The cap assembly according to claim 4, characterized in that, The edge of the inner rubber ring (2) surrounds the lower end plate (1), and the cross-sectional width of the lower end plate (1) is L0; The width of the protrusion (11) abutting against one end of the recessed portion (31) is W11 / L0 = 18% to 30% of the cross-sectional width of the lower end plate (1).

6. The cap assembly according to claim 5, characterized in that, The thickness of the protrusion (11) is H2, and the thickness of the portion of the lower end plate (1) without the protrusion (11) is H22, wherein H2 / H22 = 28% to 40%.

7. The cap assembly according to claim 6, characterized in that, The protrusion (11) has a groove (101) with a depth of H1. The ratio of the depth of the groove (101) to the thickness of the protrusion (11) is H1 / H2 = 55% to 75%.

8. The cap assembly according to claim 7, characterized in that, The distance between the edge of the protrusion (11) and the center of the groove (101) is L21, and the ratio of L21 / W11 to the width of the recessed part (31) connected to the explosion-proof sheet (3) is 8% to 18%.

9. The cap assembly according to claim 1 or 2, characterized in that, The protrusion (11) partially abuts against the recessed portion (31), and the protrusion (11) has blank areas on both sides, the width of which is L60 = 0.15mm to 0.25mm.

10. A cylindrical lithium-ion battery, characterized in that, The cap assembly includes any one of claims 1 to 9, and further includes a top cover plate (5) that is fastened to the explosion-proof plate (3).

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