Novel cylindrical battery packaging structure

Abstract

The invention belongs to the technical field of new energy batteries, particularly relates to a novel cylindrical battery packaging structure, and aims to solve the problem that the fast charging performance of a battery is affected due to high internal resistance in the prior art, the novel cylindrical battery packaging structure comprises a shell, a winding battery cell is adaptively plugged in the shell, a cylindrical negative pole is arranged at the top of the shell in a sealed manner, and the winding battery cell is connected with the negative pole in a sealed manner. The opening is vertically formed in the top of the shell, the lower end of the negative pole extends to the inner cavity of the shell and is aligned with the corresponding side of the winding battery cell, positive and negative current collecting plates and the like are canceled as intermediate carriers, and the positive lug is directly connected with the shell and the negative lug is directly connected with the negative pole, so that the internal resistance of the battery is greatly reduced on the premise of shortening a current path; a battery electric connection scheme is realized, the high and fast charging requirement is met, and meanwhile, the structures such as the positive and negative collector plates, the traditional cover plate, the upper plastic and the lower plastic are cancelled, so that the manufacturing procedures are greatly simplified, the cost is saved, the efficiency is improved, and the yield is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy battery, and particularly relates to a novel cylindrical battery packaging structure. BACKGROUND

[0002] A Chinese patent document with the application number 202311260390.1 discloses a battery packaging structure suitable for large cylindrical shells, comprising: a cylindrical shell, a plurality of modular battery assembly mechanisms, an assembly guide mechanism, and a pair of flange connection mechanisms. The plurality of modular battery assembly mechanisms are arranged in the cylindrical shell, and the modular battery assembly mechanism comprises a plurality of circuit boards, each of which is provided with a plurality of uniformly distributed square frames on one side, a plurality of batteries are arranged in the plurality of square frames, the circuit boards are electrically connected with the plurality of batteries, a packing belt is arranged outside the plurality of square frames, and the two sides of the plurality of circuit boards are connected with a bottom plate. The cylindrical battery packaging structure significantly improves the modularization degree of the lithium ion batteries in the cylindrical battery module, simplifies the convenience of installing the plurality of lithium ion batteries, greatly improves the space utilization, and enhances the reliability and practicality of the cylindrical packaging of the lithium ion batteries.

[0003] However, the battery packaging structure suitable for large cylindrical shells also has some problems, for example, the cylindrical battery is getting bigger and bigger, the internal space of the battery cell is getting more and more limited, and the size left for the battery cell is getting smaller and smaller. On one hand, high fast-charging performance is required, and on the other hand, more pole pieces need to be placed in the same outer size. The current traditional battery cell structure has the positive and negative tabs respectively welded with the current collector plate, and then connected with the cover plate and the shell, which greatly increases the overcurrent path of the tab, resulting in that the internal resistance of the cylindrical battery on the market is generally high. SUMMARY

[0004] Based on the technical problem of high internal resistance affecting the fast-charging performance of the battery in the background technology, the present application provides a novel cylindrical battery packaging structure.

[0005] The application provides a novel cylindrical battery packaging structure, which comprises a shell, a winding battery cell is arranged in the inside of the shell, a negative pole is arranged on the top of the shell, the negative pole is in a cylindrical shape and vertically arranged on the opening of the top of the shell, the lower end of the negative pole extends to the inner cavity of the shell and is aligned with the corresponding side of the winding battery cell, a sealing ring is arranged between the bottom of the negative pole and the top of the shell, an annular aluminum is arranged on the outside of the sealing ring, the negative pole and the shell are sealed by rolling the sealing ring and the annular aluminum, the annular aluminum and the shell are welded by rolling, a positive pole lug is welded on the bottom of the shell, and a negative pole lug is welded on the top of the negative pole, the positive pole lug and the shell and the negative pole lug and the negative pole are directly connected by canceling the positive pole and negative pole current collector and other intermediate carriers, the current path is shortened, the battery internal resistance is greatly reduced, the battery electrical connection scheme is realized, the high fast charging demand is met, the process procedure is greatly simplified, the cost is saved, the efficiency is improved and the yield is improved due to the cancellation of the positive pole and negative pole current collector, the traditional cover plate, the upper plastic and the lower plastic and other structures.

[0006] Preferably, the battery composed of the shell, the winding battery cell, the negative pole, the sealing ring, the annular aluminum, the positive pole lug and the negative pole lug is a cylindrical battery, the shell is in a cylindrical structure with an open top and a closed bottom, the bottom of the shell is integrally formed into a shell with a bottom by a stretching process, an annular rolling groove is formed on the opening of the top of the shell in a circumferential direction, the groove surface of the annular rolling groove is a smooth supporting surface, and the annular rolling groove is used for better connection of the annular aluminum, the sealing ring and the negative pole.

[0007] Preferably, the sealing ring is an annular rubber sealing element, the inner ring of the sealing ring is tightly attached to the outer circumferential wall of the annular rolling groove of the shell, the outer ring of the sealing ring is matched with the inner ring of the annular aluminum, the annular aluminum is an annular metal element, the lower end of the annular aluminum is attached to and supported by the groove surface of the annular rolling groove of the shell, the top end of the annular aluminum is in clearance fit with the inner wall of the opening of the bottom of the negative pole, and the inner ring of the annular aluminum is tightly pressed against the sealing ring, so that the sealing of the negative pole and the annular aluminum is realized; the negative pole and the shell are directly used as positive and negative current conductors by canceling the traditional positive and negative current collectors and the traditional cover plate structure, the overcurrent path of the pole lug is shortened, and the battery internal resistance and temperature rise are reduced.

[0008] Preferably, the shell is made of aluminum alloy, the wall thickness of the shell is 0.8-1.2 mm, the inner diameter of the shell is matched with the outer diameter of the winding battery cell with a tolerance of H7 / f6, the thickness of the bottom of the shell is 1.5-2.0 mm, the groove width of the annular rolling groove of the top of the shell is 3-5 mm, the groove depth is 1.0-1.5 mm, and the groove wall roughness Ra of the annular rolling groove is less than or equal to 0.8 μm, so that the shell has sufficient structural strength and electrical conductivity, the attachment and support effect of the shell and the annular aluminum is ensured, and displacement during rolling sealing is avoided.

[0009] Preferably, the winding electric core comprises a positive electrode sheet, a negative electrode sheet and a separator, the positive electrode sheet, the separator and the negative electrode sheet are sequentially stacked and wound to form a cylindrical structure, the positive electrode tab is made of a nickel strip, the width is 8-12 mm, the thickness is 0.1-0.15 mm, one end of the positive electrode tab is fixed with the current collector of the positive electrode sheet by ultrasonic welding, the other end of the positive electrode tab extends to the outside of the winding electric core and is aligned with the inner side wall of the bottom of the shell, the negative electrode tab is made of a copper strip, the width is 8-12 mm, the thickness is 0.1-0.15 mm, one end of the negative electrode tab is fixed with the current collector of the negative electrode sheet by ultrasonic welding, the other end of the negative electrode tab extends to the outside of the winding electric core and is aligned with the lower end face of the negative electrode column, the extension directions of the positive electrode tab and the negative electrode tab are opposite and perpendicular to the axial direction of the winding electric core, which ensures that the positive electrode tab and the negative electrode tab are connected with the positive electrode sheet and the negative electrode sheet of the winding electric core respectively, facilitates transmission, and the separator can be isolated.

[0010] Preferably, the negative electrode column is made of copper alloy material, the diameter of the negative electrode column is 10-15 mm, the length is 20-25 mm, the sealing ring is made of fluororubber material, the Shore hardness of the sealing ring is 70-80 HA, the outer diameter of the sealing ring and the inner ring of the annular aluminum are matched with a tolerance of H8 / f7, the upper and lower end faces of the sealing ring are both processed with annular anti-skid lines, and the material and structure of the negative electrode column can ensure conductivity and strength, and the structure of the sealing ring forms a tightly fitted sealing surface between the sealing ring and the negative electrode column.

[0011] Preferably, the annular aluminum is made of pure aluminum material, the outer diameter of the annular aluminum and the inner diameter of the opening of the top of the shell are matched with a tolerance of H7 / g6, the inner diameter of the annular aluminum and the outer diameter of the sealing ring are matched with a tolerance of H7 / f7, the height of the annular aluminum is 8-10 mm, the inner side of the upper end of the annular aluminum is processed with a chamfer, the angle of the chamfer is 30-45°, the lower end of the annular aluminum is processed with an annular boss at the part tightly fitted with the annular rolling groove surface of the shell, the height of the boss is 0.5-1.0 mm, the boss is tightly fitted with the annular rolling groove surface, facilitating inward extrusion during the rolling process, and the tightly fitted boss and annular rolling groove surface improve the positioning accuracy during welding.

[0012] Preferably, the welding of the positive electrode tab and the shell is laser penetration welding, the welding circumference is a continuous annular weld, the weld width is 1.0-1.5 mm, the weld depth is 0.8-1.2 mm, the protective gas during the welding process is argon, the argon flow is 10-15 L / min, the circumference welding of the annular aluminum and the shell is argon arc welding, the welding seam is a continuous annular, the weld width is 1.5-2.0 mm, the welding current is 80-100 A, and the welding speed is 5-8 mm / s, which ensures that the weld is free of defects such as pores and cracks, and guarantees the welding strength and sealing performance.

[0013] Preferably, the rolling sealing process of the annular aluminum adopts a numerical control rolling equipment, the material of the rolling wheel is hard alloy, the pressure contact surface of the rolling wheel is processed with an arc-shaped groove, the pressure during rolling is 5-8 MPa, the rolling speed is 2-3 mm / s, the welding between the negative pole column and the negative pole tab is resistance welding, the diameter of the welding spot formed after welding is 4-6 mm, the welding spot strength is greater than or equal to 50 N, uniform pressure is applied along the circumference of the annular aluminum during the rolling process, the inner side of the upper end of the annular aluminum is tightly pressed against the sealing ring, the compression amount is 30-40 percent of the height of the sealing ring, reliable sealing is realized, the leakage of the electrolyte in the battery is prevented, the stability and reliability of the current transmission path are ensured, and the virtual welding and delamination phenomena during use are avoided.

[0014] The assembly process of the packaging structure is as follows: S1: slowly loading the winding battery cell into the inner cavity of the shell along the axial direction, ensuring that the bottom of the winding battery cell is attached to the inner side wall of the bottom of the shell, and the axis of the winding battery cell coincides with the axis of the shell; S2: welding the positive pole tab with the inner side wall of the bottom of the shell by a laser penetration welding equipment to form a continuous annular welding seam; S3: processing an annular rolling groove at the opening of the top of the shell by a numerical control rolling groove equipment to ensure the groove width, groove depth and roundness accuracy of the rolling groove; S4: sleeving the sealing ring in the annular rolling groove of the shell, then sleeving the annular aluminum on the outer periphery of the sealing ring, and then installing the negative pole column to the top of the shell, so that the top of the annular aluminum is attached and positioned to the groove surface of the negative pole column; S5: welding the annular aluminum with the shell, and performing circumferential welding on the lower end of the annular aluminum and the edge of the opening of the top of the shell by an argon arc welding equipment to form a continuous sealing welding seam; S6: circumferentially rolling the upper end of the annular aluminum by a numerical control rolling equipment to tightly press the inner side of the annular aluminum against the sealing ring, and completing the sealing; S7: welding the negative pole tab with the welding groove at the lower end of the negative pole column by a resistance welding equipment to form a firm welding spot.

[0015] The beneficial effects of the present application are: canceling the positive and negative current collectors as intermediate carriers, directly connecting the positive pole tab with the shell and the negative pole tab with the negative pole column, greatly reducing the internal resistance of the battery under the premise of shortening the current path, realizing the battery electrical connection scheme, meeting the high fast charging demand, and greatly simplifying the process procedure, saving cost, improving efficiency and yield due to the cancellation of the positive and negative current collectors, traditional cover plate, upper and lower plastic structures. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a whole perspective view of a novel cylindrical battery packaging structure according to the present application; Figure 2This is an overall unfolded view of a novel cylindrical battery packaging structure proposed in this invention; Figure 3 This is a front cross-sectional view of a novel cylindrical battery packaging structure proposed in this invention. Figure 4 This is a bottom view of the casing of a novel cylindrical battery packaging structure proposed in this invention; Figure 5 This is a perspective view of the housing of a novel cylindrical battery packaging structure proposed in this invention.

[0017] In the diagram: 1. Shell; 2. Winded cell; 3. Negative terminal; 4. Sealing ring; 5. Annular aluminum; 6. Positive electrode tab; 7. Negative electrode tab; 8. Annular groove. Detailed Implementation

[0018] The present invention will be further explained below with reference to specific embodiments. Example

[0019] refer to Figures 1-5 This embodiment proposes a novel cylindrical battery packaging structure, including a housing 1. A wound battery cell 2 is fitted inside the housing 1 via an adapter plug. A negative electrode post 3 is sealed at the top of the housing 1. The negative electrode post 3 is cylindrical and vertically positioned at the opening at the top of the housing 1. The lower end of the negative electrode post 3 extends into the inner cavity of the housing 1 and aligns with the corresponding side of the wound battery cell 2. A sealing ring 4 is fitted between the bottom of the negative electrode post 3 and the top of the housing 1. An annular aluminum ring 5 is fitted around the outer side of the sealing ring 4. The negative electrode post 3 and the housing 1 are sealed by rolling the sealing ring 4 and the annular aluminum ring 5 around their perimeter. The annular aluminum 5 and the shell 1 are sealed and welded around the perimeter. The bottom of the shell 1 is welded with a positive electrode tab 6, and the top of the negative electrode post 3 is welded with a negative electrode tab 7. By eliminating the positive and negative current collectors and other intermediate carriers, the positive electrode tab 6 is directly connected to the shell 1, and the negative electrode tab 7 is directly connected to the negative electrode post 3. This greatly reduces the battery's internal resistance while shortening the current path, realizing a battery electrical connection scheme that meets the requirements of high-speed charging. At the same time, by eliminating the positive and negative current collectors, traditional cover plates, upper plastic and lower plastic structures, the manufacturing process is greatly simplified, costs are saved, efficiency is improved, and yield is increased. The battery consisting of casing 1, wound cell 2, negative electrode post 3, sealing ring 4, annular aluminum 5, positive electrode tab 6 and negative electrode tab 7 is a cylindrical battery. Casing 1 is a cylindrical structure with an open top and a closed bottom. The bottom of casing 1 is integrally formed into a bottom shell structure by stretching process. An annular groove 8 is machined along the circumference at the opening at the top of the surface of casing 1. The groove surface of the annular groove 8 is a smooth support surface. The annular groove 8 is used to support and constrain the annular aluminum 5, sealing ring 4 and negative electrode post 3 for better connection. The sealing ring 4 is an annular rubber seal. The inner ring of the sealing ring 4 is tightly fitted to the outer peripheral wall of the annular groove 8 of the housing 1. The outer ring of the sealing ring 4 is matched with the inner ring of the annular aluminum 5. The annular aluminum 5 is an annular metal part. The lower end of the annular aluminum 5 is fitted and supported by the groove surface of the annular groove 8 of the housing 1. The top end of the annular aluminum 5 is gap-fitted with the inner wall of the bottom opening of the negative electrode post 3. The inner ring of the annular aluminum 5 is tightly pressed with the sealing ring 4 to achieve a seal between the negative electrode post 3 and the annular aluminum 5. By eliminating the traditional positive and negative current collectors and the traditional cover plate structure, the negative electrode post 3 and the housing 1 are directly used as positive and negative current-carrying conductors, shortening the current path of the electrode tab and reducing the internal resistance and temperature rise of the battery. The housing 1 is made of aluminum alloy with a wall thickness of 0.8-1.2 mm. The inner diameter of the housing 1 and the outer diameter of the wound cell 2 are tolerant to H7 / f6. The thickness of the bottom of the housing 1 is 1.5-2.0 mm. The width of the annular groove 8 at the top of the housing 1 is 3-5 mm and the depth is 1.0-1.5 mm. The roughness of the groove wall Ra of the annular groove 8 is ≤0.8 μm. This ensures that the housing 1 has sufficient structural strength and conductivity, guarantees the fit and support effect with the annular aluminum 5, and avoids displacement during rolling and sealing. The wound cell 2 includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet, separator, and negative electrode sheet are stacked in sequence and then wound to form a cylindrical structure. The positive electrode tab 6 is made of nickel strip, with a width of 8-12 mm and a thickness of 0.1-0.15 mm. One end of the positive electrode tab 6 is fixed to the current collector of the positive electrode sheet by ultrasonic welding, and the other end of the positive electrode tab 6 extends to the outside of the wound cell 2 and is aligned with the inner sidewall of the bottom of the casing 1. The negative electrode tab 7 is made of copper strip, with a width of 8-12 mm. The thickness is 0.1-0.15 mm. One end of the negative electrode tab 7 is fixed to the current collector of the negative electrode sheet by ultrasonic welding. The other end of the negative electrode tab 7 extends to the outside of the wound cell 2 and is aligned with the lower end face of the negative electrode post 3. The positive electrode tab 6 and the negative electrode tab 7 extend in opposite directions and are both perpendicular to the axis of the wound cell 2, ensuring that the positive electrode tab 6 and the negative electrode tab 7 are connected to the positive and negative electrode sheets of the wound cell 2 respectively, facilitating transmission. The separator can be used for isolation. The negative electrode post 3 is made of copper alloy, with a diameter of 10-15mm and a length of 20-25mm. The sealing ring 4 is made of fluororubber, with a Shore hardness of 70-80HA. The outer diameter of the sealing ring 4 and the inner ring of the annular aluminum 5 have a tolerance fit of H8 / f7. Both the upper and lower end faces of the sealing ring 4 are machined with annular anti-slip textures. The material and structure of the negative electrode post 3 can ensure conductivity and strength. The structure of the sealing ring 4 makes the sealing ring 4 and the negative electrode post 3 form a tight sealing surface. The annular aluminum 5 is made of pure aluminum. The outer diameter of the annular aluminum 5 and the inner diameter of the top opening of the housing 1 are tolerant to H7 / g6. The inner diameter of the annular aluminum 5 and the outer diameter of the sealing ring 4 are tolerant to H7 / f7. The height of the annular aluminum 5 is 8-10mm. The upper inner side of the annular aluminum 5 is chamfered with an angle of 30-45°. The lower part of the annular aluminum 5 that is in contact with the groove surface of the annular groove 8 of the housing 1 is provided with an annular boss with a height of 0.5-1.0mm. The boss is in close contact with the groove surface of the annular groove 8, which facilitates inward pressing during the rolling process. The close contact between the boss and the groove surface of the annular groove 8 improves the positioning accuracy during welding. The welding of the positive electrode tab 6 to the shell 1 is laser penetration welding. The weld circumference is a continuous circumferential weld with a weld width of 1.0-1.5 mm and a weld depth of 0.8-1.2 mm. Argon gas is used as the shielding gas during the welding process, with an argon flow rate of 10-15 L / min. The welding of the annular aluminum 5 to the shell 1 is argon arc welding. The weld is a continuous circumferential weld with a weld width of 1.5-2.0 mm. The welding current is 80-100 A, and the welding speed is 5-8 mm / s. This ensures that the weld is free of defects such as porosity and cracks, and guarantees the welding strength and sealing performance. The rolling sealing process of the annular aluminum 5 adopts CNC rolling equipment. The rolling roller is made of hard alloy and the pressing surface of the rolling roller is machined with an arc-shaped groove. The rolling pressure is 5-8MPa and the rolling speed is 2-3mm / s. The welding of the negative electrode post 3 and the negative electrode tab 7 is resistance welding. The diameter of the weld point formed after welding is 4-6mm and the weld point strength is ≥50N. During the rolling process, pressure is applied evenly along the circumference of the annular aluminum 5 so that the inner side of the upper end of the annular aluminum 5 is tightly pressed with the sealing ring 4. The compression amount is 30-40% of the height of the sealing ring 4, which achieves reliable sealing, prevents leakage of electrolyte inside the battery, ensures the stability and reliability of the current transmission path, and avoids the phenomenon of false welding or desoldering during use. The assembly process for this packaging structure is as follows: S1: Slowly insert the wound cell 2 into the inner cavity of the housing 1 along the axial direction, ensuring that the bottom of the wound cell 2 is in contact with the inner wall of the bottom of the housing 1, and that the axis of the wound cell 2 coincides with the axis of the housing 1. S2: The positive electrode tab 6 is welded to the inner wall of the bottom of the shell 1 by laser penetration welding equipment to form a continuous annular weld. S3: Use a CNC rolling grooving machine to process an annular rolling groove 8 at the top opening of the housing 1 to ensure the accuracy of the groove width, groove depth and roundness. S4: Place the sealing ring 4 into the annular groove 8 of the housing 1, then place the annular aluminum 5 around the outer periphery of the sealing ring 4, and then install the negative electrode post 3 onto the top of the housing 1 so that the top of the annular aluminum 5 fits and is positioned against the groove surface of the negative electrode post 3. S5: The annular aluminum 5 is welded to the shell 1. The lower end of the annular aluminum 5 is welded to the edge of the top opening of the shell 1 using an argon arc welding device to form a continuous sealed weld. S6: Use CNC rolling equipment to circumferentially roll the upper end of the annular aluminum 5, so that the inner side of the annular aluminum 5 is tightly pressed with the sealing ring 4, and the sealing is completed. S7: The negative electrode tab 7 is welded to the welding groove at the lower end of the negative electrode post 3 using resistance welding equipment to form a strong weld point.

[0020] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A novel cylindrical battery packaging structure comprising a case (1), characterized in that, The inside of the shell (1) is adapted to the winding core (2), the top of the shell (1) is provided with a negative pole (3), the negative pole (3) is cylindrical, vertically arranged in the opening of the top of the shell (1), the lower end of the negative pole (3) extends to the inner cavity of the shell (1) and is aligned with the corresponding side of the winding core (2), the bottom of the negative pole (3) and the top of the shell (1) are sleeved with a sealing ring (4), the outer side of the sealing ring (4) is sleeved with an annular aluminum (5), the negative pole (3) and the shell (1) are sealed by rolling the sealing ring (4) and the annular aluminum (5) around the circle, the annular aluminum (5) and the shell (1) are welded around the circle, the bottom of the shell (1) is welded with a positive pole lug (6), and the top of the negative pole (3) is welded with a negative pole lug (7).

2. A novel cylindrical battery packaging structure according to claim 1, characterized by, The shell (1), the winding core (2), the negative pole (3), the sealing ring (4), the annular aluminum (5), the positive pole lug (6) and the negative pole lug (7) constitute a cylindrical battery, the shell (1) is a cylindrical structure with an open top and a closed bottom, the bottom of the shell (1) is integrally formed into a bottom shell structure by a stretching process, and the opening at the top of the surface of the shell (1) is processed with an annular rolling groove (8) in the circumferential direction, and the groove surface of the annular rolling groove (8) is a smooth supporting surface.

3. A novel cylindrical battery packaging structure according to claim 2, characterized by, The sealing ring (4) is an annular rubber sealing element, the inner ring of the sealing ring (4) is tightly fitted with the outer peripheral wall of the annular rolling groove (8) of the shell (1), the outer ring of the sealing ring (4) is adapted to the inner ring of the annular aluminum (5), the annular aluminum (5) is an annular metal element, the lower end of the annular aluminum (5) is fitted and supported with the groove surface of the annular rolling groove (8) of the shell (1), and the top end of the annular aluminum (5) is gap-fitted with the inner wall of the opening at the bottom of the negative pole (3).

4. The novel cylindrical battery packaging structure according to claim 2, wherein The shell (1) is made of aluminum alloy material, the wall thickness of the shell (1) is 0.8-1.2mm, the inner diameter of the shell (1) and the outer diameter of the winding core (2) are tolerance-fitted as H7 / f6, the thickness of the bottom of the shell (1) is 1.5-2.0mm, the groove width of the annular rolling groove (8) at the top of the shell (1) is 3-5mm, the groove depth is 1.0-1.5mm, and the groove wall roughness Ra of the annular rolling groove (8) is ≤0.8μm.

5. The novel cylindrical battery packaging structure according to claim 1, wherein The winding core (2) comprises a positive pole piece, a negative pole piece and a separator, the positive pole piece, the separator and the negative pole piece are sequentially stacked and wound to form a cylindrical structure, the positive pole lug (6) is made of a nickel strip, the width is 8-12mm, the thickness is 0.1-0.15mm, one end of the positive pole lug (6) is fixed with the current collector of the positive pole piece by ultrasonic welding, the other end of the positive pole lug (6) extends to the outer side of the winding core (2) and is aligned with the inner side wall of the bottom of the shell (1), the negative pole lug (7) is made of a copper strip, the width is 8-12mm, the thickness is 0.1-0.15mm, one end of the negative pole lug (7) is fixed with the current collector of the negative pole piece by ultrasonic welding, the other end of the negative pole lug (7) extends to the outer side of the winding core (2) and is aligned with the end face of the lower end of the negative pole (3), the extension directions of the positive pole lug (6) and the negative pole lug (7) are opposite and perpendicular to the axis direction of the winding core (2).

6. The novel cylindrical battery packaging structure according to claim 1, wherein The negative pole post (3) is made of copper alloy material, the diameter of the negative pole post (3) is 10-15 mm, the length of the negative pole post (3) is 20-25 mm, the sealing ring (4) is made of fluorine rubber material, the Shore hardness of the sealing ring (4) is 70-80 HA, the outer diameter of the sealing ring (4) and the inner circle of the annular aluminum (5) are in H8 / f7 tolerance fit, and the upper and lower end faces of the sealing ring (4) are both processed with annular anti-skid lines.

7. The novel cylindrical battery packaging structure according to claim 2, wherein The annular aluminum (5) is made of pure aluminum material, the outer diameter of the annular aluminum (5) and the inner diameter of the top opening of the shell (1) are in H7 / g6 tolerance fit, the inner diameter of the annular aluminum (5) and the outer diameter of the sealing ring (4) are in H7 / f7 tolerance fit, the height of the annular aluminum (5) is 8-10 mm, the inner side of the upper end of the annular aluminum (5) is processed with a chamfer, the angle of the chamfer is 30-45°, the lower end of the annular aluminum (5) is processed with an annular boss at the position where the annular aluminum (5) is tightly fitted with the groove surface of the annular rolling groove (8) of the shell (1), the height of the boss is 0.5-1.0 mm, and the boss is tightly fitted with the groove surface of the annular rolling groove (8).

8. The novel cylindrical battery packaging structure according to claim 1, wherein The welding of the positive pole lug (6) and the shell (1) is laser penetration welding, the welding circumference is a continuous annular weld, the weld width is 1.0-1.5 mm, the weld depth is 0.8-1.2 mm, the protective gas used in the welding process is argon, the argon flow rate is 10-15 L / min, the circumference welding of the annular aluminum (5) and the shell (1) is argon arc welding, the welding seam is a continuous annular, the weld width is 1.5-2.0 mm, the welding current is 80-100 A, and the welding speed is 5-8 mm / s.

9. The novel cylindrical battery packaging structure according to claim 1, wherein The rolling sealing process of the annular aluminum (5) adopts numerical control rolling equipment, the material of the rolling wheel is hard alloy, the pressure of the rolling wheel is 5-8 MPa, the rolling speed is 2-3 mm / s, the welding of the negative pole post (3) and the negative pole lug (7) is resistance welding, the diameter of the welding spot formed after the welding is 4-6 mm, and the welding spot strength is ≥50 N.

10. The novel cylindrical battery packaging structure according to claim 1, wherein The assembly process of the packaging structure is as follows: S1: slowly assemble the winding battery cell (2) into the inner cavity of the shell (1) along the axial direction, ensure that the bottom of the winding battery cell (2) is fitted with the inner side wall of the bottom of the shell (1), and the axis of the winding battery cell (2) coincides with the axis of the shell (1); S2: weld the positive pole lug (6) and the inner side wall of the bottom of the shell (1) by using a laser penetration welding device to form a continuous annular weld; S3: process an annular rolling groove (8) at the top opening of the shell (1) by using numerical control rolling groove equipment to ensure the groove width, groove depth and roundness accuracy of the rolling groove; S4: set the sealing ring (4) in the annular rolling groove (8) of the shell (1), then set the annular aluminum (5) on the outer periphery of the sealing ring (4), and then install the negative pole post (3) to the top of the shell (1) so that the top of the annular aluminum (5) is fitted and positioned with the groove surface of the negative pole post (3); S5: weld the annular aluminum (5) and the shell (1), and perform circumference welding on the lower end of the annular aluminum (5) and the edge of the top opening of the shell (1) by using an argon arc welding device to form a continuous sealing weld. S6: The upper end of the annular aluminum (5) is circumferentially rolled by a numerical control rolling equipment, so that the inner side of the annular aluminum (5) is tightly pressed against the sealing ring (4), and the sealing is completed. S7: The negative electrode tab (7) is welded with the welding groove at the lower end of the negative electrode post (3) by a resistance welding equipment, so that a firm welding point is formed.

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