Battery

Abstract

The utility model provides a battery which comprises a shell, a terminal assembly, a roll core and a current collecting disc, the current collecting disc is arranged in the shell and comprises a bulge and a disc body arranged around the bulge, the bulge protrudes out of the disc body along the axial direction of the battery, the bulge is connected with the terminal assembly, and one side, deviating from the terminal assembly, of the disc body is connected with the roll core; in the axial direction of the battery, the height of the bulge is M1, the thickness of the disc body is M2, and M1 is smaller than or equal to 2M2; according to the utility model, the connection between the collector plate and the terminal assembly can be ensured, the effective welding between the collector plate and the terminal assembly is realized, and the overcurrent requirement of the battery is met; meanwhile, through the arrangement of the bulges, the overall thickness of the plate body part is not increased, the influence on the internal space of the battery shell is avoided, and the effective welding between the collector plate and the terminal assembly is realized, so that the overcurrent requirement of the battery is met.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, specifically to a battery. Background Technology

[0002] In related technologies, the battery structure mainly consists of a core, a casing, terminal assemblies, and current collectors. The casing and the core are usually connected by current collectors. In specific connection, the positive terminal of the core is connected to the positive terminal assembly through the positive current collector, and the negative terminal of the core is connected to the negative terminal assembly through the negative current collector. During the connection process between the terminal assembly and the current collector, the connection between the terminal assembly and the current collector often fails, resulting in weld spalling or incomplete welding during the welding process. This not only fails to meet the overcurrent requirements of the battery but may also cause the connection between the current collector and the core to break, rendering the battery unusable. Utility Model Content

[0003] The present invention provides a battery that can improve the technical problem of inadequate connection between terminal components and current collector, which fails to meet battery overcurrent requirements and affects battery use.

[0004] An embodiment of this utility model provides a battery, comprising:

[0005] case;

[0006] Terminal assembly, disposed within the housing;

[0007] The core is disposed within the housing; and,

[0008] A current collector, disposed within the housing, includes a protrusion and a disc body surrounding the protrusion. Along the axial direction of the battery, the protrusion protrudes from the disc body and is connected to the terminal assembly. The side of the disc body opposite to the terminal assembly is connected to the winding core.

[0009] Wherein, along the axial direction of the battery, the height of the protrusion is M1, the thickness of the disc is M2, and M1≤2M2.

[0010] In one embodiment, insulating tape is also included for insulation between the disc body and the inner sidewall of the housing.

[0011] In one embodiment, the thickness of the insulating tape is M3, where M3≤M1≤2(M2+M3).

[0012] In one embodiment, the protruding structure has a first through hole, and the terminal assembly has a second through hole, wherein the first through hole and the second through hole are arranged opposite to each other and interconnected.

[0013] In one embodiment, the diameter of the first through hole is M4, and the diameter of the second through hole is M5, where M4 ≥ M5.

[0014] In one embodiment, the terminal assembly includes a pressure ring and a pole post, the pole post being connected to the protrusion, the pressure ring being disposed around the outer periphery of the pole post, and the second through hole being disposed on the pole post.

[0015] In one embodiment, the maximum outer diameter of the protrusion is M6, the inner diameter of the second through hole on the side near the collector plate is M7, and the maximum outer diameter of the pressure ring is M8, where M8≥M6≥M7.

[0016] In one embodiment, the diameter of the disc body is M9, and the maximum outer diameter of the winding core is M. 10 M9≤M 10 .

[0017] In one embodiment, the surface area of ​​the disk is M. 11 The area of ​​the radial end face of the winding core is M. 12 M 11 ≥70% M 12 .

[0018] In one embodiment, the thickness M2 of the disk body is set between 0.2 mm and 2 mm.

[0019] In one embodiment, the core includes two oppositely disposed end faces and a side face connecting the two end faces, one end of the insulating adhesive paper is attached to the side face of the core, and the other end of the insulating adhesive paper is attached to the side of the disc body opposite to the core.

[0020] In one embodiment, the insulating tape located in the transition area between the core and the disc forms a flow channel for the passage of electrolyte.

[0021] In one embodiment, the width of the flow channel along the radial direction of the core is M. 13 M 13 ≤20mm.

[0022] In one embodiment, the height of the winding core is M. 14 Along the axial direction of the core, the height at which the insulating adhesive paper is attached to the side of the core is M. 15 M 14 >M 15 >3mm.

[0023] In one embodiment, the insulating tape is arranged circumferentially along the core, and the two ends of the insulating tape overlap to form an overlapping area along the circumferential direction of the core.

[0024] In one embodiment, the width of the overlapping region along the circumference of the core is M. 16 20% M9 > M 16 >1mm.

[0025] In one embodiment, the width of the insulating tape adhered to the disk body along the radial direction is M. 16 20% M9 > M 16 >1.5mm.

[0026] In one embodiment, the insulating tape includes a first region connected to the side of the disc body opposite to the core and a second region connected to the side of the core, wherein the maximum diameter of the first region is M. 16 The maximum diameter of the second region is M. 17 50% M 17 ≤M 16 ≤95%M 17 .

[0027] In one embodiment, the distance between the bottom surface of the insulating adhesive paper away from the disk body and the bottom surface of the second region is M. 17 The distance M between the bottom surface of the insulating adhesive paper away from the disc body and the bottom surface of the core on the side away from the disc body. 18 1% M 18 ≤M 17 ≤60%M 18 .

[0028] In one embodiment, a battery further includes an insulating pad disposed on the side of the disc body opposite to the winding core, for insulating the disc body from the housing.

[0029] In one embodiment, the diameter of the insulating pad is M. 19 Along the radial direction of the core, the thickness of the insulating tape in the second region is M. 20 M 19 >M 10 +2M 20 .

[0030] The beneficial effects of the embodiments of this utility model are as follows:

[0031] In embodiments of this utility model, the current collector includes a disk body and a protrusion extending from the disk body. The protrusion connects to the terminal assembly, ensuring a secure connection between the current collector and the terminal assembly, preventing incomplete soldering and weld spalling during the welding process. It also guarantees a sufficient connection area between the current collector and the terminal assembly, enabling effective welding and meeting the battery's overcurrent requirements. Furthermore, the protrusion does not increase the overall thickness of the disk body, avoiding impact on the internal space of the battery casing. In addition, the parameter setting of M1≤2M2 ensures contact between the protrusion and the terminal assembly without making the protrusion too large, further preventing interference with the internal space of the battery casing. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.

[0033] Figure 1 This is a cross-sectional view of a battery provided in Embodiment 1 of this utility model;

[0034] Figure 2 This is a cross-sectional view of a battery after it has been covered with insulating tape, according to an embodiment of this utility model.

[0035] Figure 3 This is a cross-sectional view of the collector plate provided in an embodiment of this utility model;

[0036] Figure 4 This is a cross-sectional view of a battery provided in Embodiment 2 of this utility model;

[0037] Figure 5 This is a schematic diagram of the flow channel provided in an embodiment of the present invention;

[0038] Figure 6 This is a top view of the insulating adhesive paper provided in an embodiment of this utility model.

[0039] Figure Labels

[0040] 1. Battery;

[0041] 20. Terminal assembly; 21. Pole post; 24. Pressure ring; 201. Second through hole;

[0042] 33. Core; 331. End face; 332. Side; 34. Flow channel;

[0043] 35. Collector plate; 351. Protrusion; 352. Plate body; 353. First through hole;

[0044] 40. Insulating tape; 401. First area; 402. Second area;

[0045] 50. Insulating gaskets. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0047] Reference Figures 1 to 3 As shown, this application provides a battery, including a casing, a terminal assembly 20, a winding core 33, and a current collector 35;

[0048] The terminal assembly 20 is disposed within the housing;

[0049] The core 33 is disposed within the housing; and,

[0050] The current collector 35 is disposed inside the housing and includes a protrusion 351 and a disc body 352 surrounding the protrusion 351. Along the axial direction of the battery 1, the protrusion 351 protrudes from the disc body 352. The protrusion 351 is connected to the terminal assembly 20, and the side of the disc body 352 facing away from the terminal assembly 20 is connected to the winding core 33.

[0051] Wherein, along the axial direction of the battery 1, the height of the protrusion 351 is M1, the thickness of the disk 352 is M2, and M1≤2M2.

[0052] In this embodiment of the invention, the current collector 35 includes a disk body 352 and a protrusion 351 extending from the disk body 352. The current collector 351 connects to the terminal assembly 20, ensuring a secure connection between the current collector 35 and the terminal assembly 20 and preventing incomplete or burst soldering during the welding process. It also ensures a sufficient connection area between the current collector 35 and the terminal assembly 20, achieving effective welding and thus meeting the current requirements of the battery 1. Furthermore, the protrusion 351 does not increase the overall thickness of the disk body 352, avoiding impact on the internal space of the battery 1's casing. In addition, the parameter setting of M1≤2M2 ensures contact between the protrusion 351 and the terminal assembly 20 without making the protrusion 351 too large, further preventing any impact on the internal space of the battery 1's casing.

[0053] In some embodiments, reference Figure 2 As shown, in order to ensure the insulation between the outer peripheral surface of the collector 35 and the inner sidewall of the housing, insulating tape 40 is also included for insulation between the collector 352 and the inner sidewall of the housing.

[0054] In some embodiments, the thickness of the insulating tape 40 is M3, where M3≤M1≤2(M2+M3). Therefore, when the current collector 35 is covered with the insulating tape 40, the height of the protrusion 351 can also protrude beyond the surface of the insulating tape 40, thereby ensuring the connection between the protrusion 351 and the terminal assembly 20.

[0055] In this embodiment, reference Figure 3 As shown, the protrusion 351 is located in the middle of the disk body 352 and is connected to the terminal assembly 20 through the middle position. This can better ensure the connection between the protrusion 351 of the current collector 35 and the terminal assembly 20, realize the effective welding between the protrusion 351 and the terminal assembly 20, and thus ensure that the connection between the current collector 35 and the terminal assembly 20 can meet the overcurrent requirements of the battery 1 and ensure the normal use of the battery 1.

[0056] In some embodiments, reference Figure 4 As shown, the protrusion 351 has a first through hole 353, and the terminal assembly 20 has a second through hole 201. The first through hole 353 and the second through hole 201 are arranged opposite to each other and are interconnected. The arrangement of the first through hole 353 and the second through hole 201 facilitates the electrolyte injection process, ensuring that the electrolyte flows smoothly into the battery 1. Simultaneously, the opposite arrangement of the first through hole 353 and the second through hole 201 ensures the accuracy of the electrolyte injection process, guaranteeing the smooth flow of the electrolyte into the battery 1 and ensuring the effective use of the battery 1.

[0057] In some embodiments, the diameter of the first through hole 353 is M4, and the diameter of the second through hole 201 is M5, where M4 ≥ M5. That is, the diameter of the first through hole 353 on the collector plate 35 is not smaller than the diameter of the second through hole 201 on the terminal assembly 20. After the battery 1 is assembled, along the axial direction of the battery 1, the terminal assembly 20 is located inside the housing and close to the opening of the housing, while the collector plate 35 is located inside the housing and away from the opening of the housing. Therefore, the diameter of the first through hole 353 on the side away from the opening is not smaller than the diameter of the second through hole 201 on the side close to the opening, which can ensure that the electrolyte can flow smoothly into the core 33, so that the core 33 is fully wetted, avoid electrolyte leakage, and ensure the normal use requirements of the battery 1.

[0058] In some embodiments, the terminal assembly 20 includes a pressure ring 24 and a pole post 21, the pole post 21 being connected to the protrusion 351, the pressure ring 24 being arranged around the outer periphery of the pole post 21, and the second through hole 201 being disposed on the pole post 21.

[0059] It should also be noted that the reference Figure 1 As shown, in this embodiment, the pressure ring 24 is disposed on the side of the pole post 21 near the collector plate 35 to press the pole post 21 against the surface of the convex shroud, thereby ensuring that the pole post 21 can fully contact the convex shroud, thus ensuring the connection between the pole post 21 and the convex shroud, and avoiding the phenomenon of soldering failure or poor soldering between the collector plate 35 and the terminal assembly 20.

[0060] In some embodiments, the maximum outer diameter of the protrusion 351 is M6, the inner diameter of the second through hole 201 near the collector plate 35 is M7, and the maximum outer diameter of the pressure ring 24 is M8, where M8 ≥ M6 ≥ M7. Accordingly, the maximum outer diameter of the protrusion 351 is greater than the inner diameter of the second through hole 201, ensuring the contact area between the collector plate 35 and the terminal assembly 20, thereby guaranteeing the connection between the collector plate 35 and the terminal assembly 20. Simultaneously, the maximum outer diameter of the protrusion 351 does not exceed the maximum outer diameter of the pressure ring 24, reserving more air chamber space within the housing and reducing internal pressure.

[0061] In some embodiments, the diameter of the disc body 352 is M9, and the maximum outer diameter of the winding core 33 is M. 10 M9≤M 10 Therefore, by setting the above parameters, the assembly of the current collector 35 and the winding core 33 can be facilitated, while ensuring the performance of the winding core 33 and avoiding the inability to meet the overcurrent requirements of the battery 1 due to the size of the winding core 33 being too small, thus ensuring the normal use of the battery 1.

[0062] In some embodiments, the surface area of ​​the disk body 352 is M11 The area of ​​the radial end face 331 of the core 33 is M. 12 M 11 ≥70% M 12 Therefore, by setting the above parameters, the assembly of the current collector 35 and the winding core 33 can be facilitated, while ensuring the performance of the winding core 33. This avoids the inability to meet the overcurrent requirements of the battery 1 due to the insufficient connection area of ​​the winding core 33, thus ensuring the normal use of the battery 1.

[0063] In some embodiments, the thickness M2 of the disc body 352 is set between 0.2mm and 2mm. By setting the above parameters, the thickness of the disc body 352 can be made moderate, avoiding interference with the original internal space of the battery 1, meeting the assembly space requirements of the battery cell of the battery 1, and also facilitating the forming and processing of the disc body 352.

[0064] In some embodiments, to avoid short circuit between the manifold 35 and the inner sidewall of the housing, the core 33 includes two oppositely arranged end faces 331 and a side face 332 connecting the two end faces 331. One end of the insulating tape 40 is attached to the side face 332 of the core 33, and the other end of the insulating tape 40 is attached to the side of the disc body 352 away from the core 33.

[0065] In some embodiments, reference Figure 5 As shown, the insulating tape 40 located in the transition area between the core 33 and the disc 352 forms a flow channel 34 for the passage of electrolyte. During the assembly process, the insulating tape 40 is flattened, creating a gap in the transition area between the core 33 and the disc 352. In this area, the insulating tape 40 does not have a perfect seal, thus forming a flow channel 34 for the electrolyte, allowing it to flow into this area. Therefore, when the electrolyte seeps out, this area becomes an effective communication channel, facilitating the flow of electrolyte between the positive and negative electrodes of the battery 1, ensuring the electrical performance of the core 33. Simultaneously, electrolyte outside the core 33 can easily flow back into the core 33 through this channel, ensuring the battery 1 can smoothly complete the charging and discharging process and guarantee its normal operation.

[0066] It is understandable that, since the diameter of the collector plate 35 is smaller than the diameter of the core 33, a step can be formed in the transition area between the collector plate 35 and the core 33. When the insulating tape 40 is attached to this area, the insulating tape 40 cannot be perfectly attached and does not have a perfect sealing effect, thus forming an effective communication channel for the electrolyte.

[0067] In some embodiments, the width of the flow channel 34 along the radial direction of the core 33 is M. 13 M13 ≤40%M 10 In this embodiment, the width of the flow channel 34 is M. 13 The width is unilateral. Therefore, it can prevent the width of the flow channel 34 from being too large, avoid a large diameter difference between the core 33 and the disc 352, and prevent the tape from being unable to be flattened and applied to the disc 352 and the core 33. This ensures that the insulating tape 40 can be firmly attached to the core 33 and the disc 352, achieving the insulating effect of the insulating tape 40.

[0068] In some embodiments, the height of the core 33 is M. 14 Along the axial direction of the core 33, the insulating adhesive paper 40 is attached to the side surface 332 of the core 33 at a height of M. 15 M 14 >M 15 >3mm. In this embodiment, the length of the insulating tape 40 covering the side 332 of the core 33 is greater than 3mm, but it does not completely cover the entire side 332 of the core 33. This ensures that the insulating tape 40 can be firmly attached to the side 332 of the core 33, and also prevents the insulating tape 40 from being attached to the core 33 at an excessive height, thus avoiding waste of the insulating tape 40.

[0069] In addition, the insulating tape 40 does not cover the entire side 332 of the core 33, which can also prevent the insulating tape 40 from occupying too much internal space in the housing, thus avoiding reducing the air chamber space in the housing and reducing the pressure inside the housing.

[0070] In some embodiments, the insulating tape 40 is arranged circumferentially along the core 33, and the two ends of the insulating tape 40 overlap after being enclosed along the core 33. During the application process, the insulating tape 40 needs to be applied around the entire circle of the manifold 35 and the core 33, and the overlapping area formed by the two ends of the insulating tape 40 prevents any gaps in the outer periphery of the manifold 35 or the core 33. Furthermore, the overlapping area at both ends of the insulating tape 40 ensures the stability of the connection, prevents tape detachment, and guarantees the insulating effect of the insulating tape 40.

[0071] In some embodiments, the width of the overlapping region along the circumference of the core 33 is M. 16 20% M9 > M 16 >1mm.

[0072] In some embodiments, the width of the insulating tape 40 attached to the disk body 352 along the radial direction of the disk body 352 is M. 16 20% M9 > M 16>1.5mm. In this embodiment, the width of the insulating tape 40 attached to the disk body 352 is M. 16 With a single-sided width, the insulating tape 40 is applied to the side of the disc 352 away from the core 33 with a width greater than 1.5mm, but not exceeding 20% ​​of the diameter of the entire disc 352. This ensures that the insulating tape 40 can be firmly attached to the side of the collector disc 35 away from the core 33, and also prevents the width of the insulating tape 40 on the disc 352 from being too large, thereby preventing any impact on the working performance of the disc 352 and avoiding waste of the insulating tape 40.

[0073] In addition, the insulating tape 40 does not cover the entire disc 352, which can also prevent the insulating tape 40 from occupying too much internal space in the housing, thus avoiding reducing the air chamber space in the housing and reducing the pressure inside the housing.

[0074] In some embodiments, reference Figure 6 As shown, the insulating tape 40 includes a first region 401 connected to the side of the disc 352 opposite to the core 33 and a second region 402 connected to the side surface 332 of the core 33. The maximum diameter of the first region 401 is M. 16 The maximum diameter of the second region 402 is M. 17 50% M 17 ≤M 16 ≤95%M 17 By adopting the above settings, the width of the flow channel 34 can be avoided from being too large, thereby ensuring that the insulating tape 40 can be smoothly applied to the core 33 and the collector plate 35 after being flattened, thus ensuring the insulation effect of the insulating tape 40.

[0075] In some embodiments, the distance between the bottom surface of the insulating adhesive paper 40 away from the disk body 352 and the bottom surface of the second region 402 is M. 17 The distance M between the bottom surface of the insulating adhesive paper 40 away from the disc body 352 and the bottom surface of the core 33 on the side away from the disc body 352. 18 1% M 18 ≤M 17 ≤60%M 18 In this embodiment, the insulating tape 40 does not need to be applied to all sides 332 of the core 33, thus avoiding waste of the insulating tape 40. At the same time, it also prevents the filling of too much internal space of the casing, thereby avoiding the reduction of the air chamber space inside the casing due to the application of the insulating tape 40, and ensuring the safe use of the battery 1.

[0076] In some embodiments, a battery further includes an insulating pad 50 disposed on the side of the disc 352 opposite to the winding core 33, for insulating the disc 352 from the housing. The insulating pad 50 ensures insulation between the surface of the current collector 35 and the housing, and works in conjunction with the insulating tape 40 to prevent short circuits between any part of the current collector 35 and the housing, thus ensuring the normal operation of the battery 1.

[0077] In some embodiments, reference Figure 1 and Figure 4 As shown, the diameter of the insulating pad 50 is M. 19 Along the radial direction of the core 33, the thickness of the insulating tape 40 in the second region 402 is M. 20 M 19 >M 10 +2M 20 In other words, in this embodiment, the diameter of the insulating gasket 50 is larger than the overall diameter of the core 33 after adhesive application. Therefore, the overall insulation performance of the insulating gasket 50 can be guaranteed, thereby ensuring the insulation effectiveness of the insulating gasket 50.

[0078] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A battery, characterized by The battery comprises: a shell; a terminal assembly arranged in the shell; a winding core arranged in the shell; and a current collector arranged in the shell, comprising a protrusion and a disc body arranged around the protrusion, the protrusion protruding from the disc body in the axial direction of the battery, the protrusion being connected with the terminal assembly, and the side of the disc body away from the terminal assembly being connected with the winding core. In the axial direction of the battery, the height of the protrusion is M1, the thickness of the disc body is M2, and M1≤2M2. The battery further comprises an insulating adhesive paper for insulating the disc body from the inner side wall of the shell.

2. The battery of claim 1, wherein The thickness of the insulating adhesive paper is M3, and M3≤M1≤2(M2+M3).

3. A battery according to claim 2, wherein The protrusion is provided with a first through hole, and the terminal assembly is provided with a second through hole, the first through hole and the second through hole being arranged opposite to each other and interconnected.

4. The battery of claim 1, wherein The diameter of the first through hole is M4, and the diameter of the second through hole is M5, and M4≥M5.

5. A battery according to claim 4, wherein The terminal assembly comprises a compression ring and a pole, the pole being connected with the protrusion, the compression ring being annularly arranged on the outer periphery of the pole, and the second through hole being arranged on the pole.

6. A battery according to claim 5, wherein The maximum outer diameter of the protrusion is M6, the inner diameter of the side of the second through hole close to the current collector is M7, and the maximum outer diameter of the compression ring is M8, and M8≥M6≥M7.

7. A battery according to claim 6, wherein The thickness M2 of the disc body is arranged between 0.2mm and 2mm.

8. The battery of claim 1, wherein, The diameter of the disc body is M9, and the maximum outer diameter of the winding core is M 10 , M9≤M 10 .

9. The battery of claim 1, wherein, The surface area of the disc is M 11 The area of the end face of the winding core in the radial direction is M 12 M 11 ≥ 70% M 12 .

10. The battery of claim 1, wherein, The winding core comprises two opposite end faces and a side surface connecting the two end faces, one end of the insulating adhesive paper being attached to the side surface of the winding core, and the other end of the insulating adhesive paper being attached to the side of the disc body away from the winding core.

11. The battery of claim 2, wherein, The insulating adhesive paper located in the transition area between the winding core and the disc body forms a flow channel for electrolyte.

12. The battery of claim 11, wherein, The insulating adhesive paper is arranged in the circumferential direction of the winding core, and the two ends of the insulating adhesive paper form an overlapping area after being enclosed.

13. The battery of claim 12, wherein the electrolyte is a mixture of LiPF6 and LiBF4. The width of the flow passage is M along the radial direction of the winding core 13 , M 13 ≤ 40% M 10 .

14. The battery of claim 11, wherein the electrolyte comprises a lithium salt. The height of the core is M 14 , along the axial direction of the core, the height of the insulating tape attached to the side of the core is M 15 , M 14 >M 15 >3mm.

15. The battery of claim 11, wherein the cathode comprises a lithium metal oxide. The battery further comprises an insulating gasket arranged on the side of the disc body away from the winding core for insulating the disc body from the shell.

16. The battery of claim 15, wherein the electrolyte is a mixture of LiPF6 and LiBF4. The width of the overlap region is M along the circumference of the core 16 , 20% M9 > M 16 > 1 mm.

17. The battery of claim 11, wherein the cathode comprises a lithium metal oxide. The width of the insulating adhesive tape attached to the disc body is M along the radial direction of the disc body 16 , 20% M9 > M 16 > 1.5 mm.

18. The battery of claim 11, wherein, The insulating adhesive paper includes a first area connected to a side of the disc body facing away from the roll core and a second area connected to a side of the roll core, a maximum diameter of the first area is M 16 , a maximum diameter of the second area is M 17 , 50% M 17 ≤ M 16 ≤ 95% M 17 .

19. The battery of claim 18, wherein the electrolyte is a mixture of LiPF6 and LiBF4. The distance between the bottom surface of the insulating adhesive paper far away from the bottom surface of the disc body and the bottom surface of the second area is M 17 The distance between the bottom surface of the insulating adhesive paper far away from the bottom surface of the disc body and the bottom surface of the second area is M 18 1% M 18 ≤M 17 ≤60% M 18 .

20. The battery of claim 18, wherein, ​ 21. The battery of claim 20, wherein, The diameter of the insulating gasket is M 19 The thickness of the insulating adhesive tape of the second area is M 20 , in the radial direction of the roll core 19 M 10 +2M 20 .

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