A new type of cylindrical all-tab battery structure and its assembly and welding process

Abstract

The present invention discloses a novel cylindrical all-tab battery structure and its assembly welding process, which includes a steel shell, a positive end cap, a positive current collector plate, a negative end cap, a negative current collector plate and a winding core. The winding core is arranged inside the steel shell. The positive end cap is electrically connected to the positive end of the winding core through the positive current collector plate. The lower end of the steel shell is open. The negative end of the winding core is fixedly connected to the negative current collector plate. A conical bending edge is provided on the outer edge of the negative current collector plate, and this conical bending edge is fixedly connected to the steel shell. The steel shell is electrically connected to the negative end of the winding core through the negative current collector plate, which is set as the negative end of the battery. The negative end cap is sleeved on the outer side surface of the lower end of the steel shell and is fixedly connected to the steel shell at the upper end. There is a liquid injection hole coaxially with the central hole of the winding core in the middle, and a liquid injection plug is provided in the liquid injection hole for sealing. By changing the structures of the negative end cap, the negative current collector plate and the steel shell, the present invention adopts a splicing continuous laser welding method for both the negative end cap and the steel shell, and the steel shell and the negative current collector plate, thereby reducing the welding difficulty, preventing false soldering and improving the product yield.

Description

Technical Field

[0001] The present invention relates to the technical field of cylindrical lithium batteries, and in particular to a novel cylindrical full-tab battery structure and its welding process. Background Art

[0002] In the field of lithium batteries, in order to meet the requirements of various industries, the energy density requirement is getting higher and higher. This not only puts forward higher requirements for the positive and negative electrode materials, separator, electrolyte, etc. of the battery, but also has higher requirements for the stability, light weight, and safety of the battery structure parts. In the existing cylindrical full-tab battery, the negative end cap is penetration-welded to the steel shell, and the steel shell is penetration-welded to the negative current collector plate. However, penetration welding is not easy to control, which is likely to cause battery short circuit or poor welding, reducing the product yield rate. Summary of the Invention

[0003] To solve the problem that the welding process of the existing cylindrical full-tab battery structure needs to use penetration welding, which is not easy to control, likely to cause battery short circuit or poor welding, and reduces the product yield rate, the present invention provides a novel cylindrical full-tab battery structure. The welding of the negative end cap to the steel shell, the steel shell to the negative current collector plate, and the positive end cap welding plate to the steel shell are all changed to spliced continuous laser welding, reducing the welding difficulty and improving the product yield rate.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A novel cylindrical full-tab battery structure includes a steel shell, a positive end cap, a positive current collector plate, a negative end cap, a negative current collector plate, and a winding core. The winding core is arranged inside the steel shell. The positive end cap is electrically connected to the positive end of the winding core through the positive current collector plate. The steel shell is electrically connected to the negative end of the winding core through the negative current collector plate. It is characterized in that: the lower end of the steel shell is open. The lower end face of the negative end of the winding core is fixedly connected to the upper plane of the negative current collector plate. The outer edge of the negative current collector plate is provided with a downward-extending conical bending edge, and the lower end of the conical bending edge is fixedly connected to the inner side surface of the lower end of the steel shell. The steel shell is negatively charged and is set as the negative end of the battery. The negative end cap is sleeved on the outer side surface of the lower end of the steel shell, and the upper end is fixedly connected to the outer side surface of the lower end of the steel shell. There is a liquid injection hole coaxially with the central hole of the winding core in the middle, and the liquid injection hole is sealed with a liquid injection plug.

[0006] As a further improvement of the present technology, a cover plate integrally formed is provided at the upper end of the steel shell. A circular boss with equal wall thickness and protruding upward is integrally formed in the middle of the cover plate. A through hole is provided in the middle of the circular boss. The positive end cover includes a positive pole column, an insulating protective sleeve, a welding plate, a riveting washer and an insulating partition. The positive pole column is arranged in the through hole. The insulating protective sleeve is arranged in the through hole and sleeved on the outer side surface of the positive pole column. The welding plate is sleeved on the outer side surface of the insulating protective sleeve. A flange extending outward is provided at the outer edge of the upper end of the welding plate. The upper plane of the flange is fixedly connected to the lower bottom surface of the circular boss. The insulating partition is sleeved on the outer side surface of the insulating protective sleeve, located below the welding plate, and a downward-extending bending edge is provided at the outer edge. The riveting washer is sleeved on the outer side surface of the insulating protective sleeve, located below the insulating partition. The insulating protective sleeve, the welding plate, the insulating partition, the riveting washer and the positive pole column are hermetically and fixedly connected into one body by riveting. A connecting piece is fixedly connected to the lower bottom surface of the positive pole column. The lower plane of the connecting piece is fixedly connected to the upper plane of the positive current collector plate. The lower plane of the positive current collector plate is fixedly connected to the end face of the positive extreme of the winding core. The positive pole column is conducted with the positive extreme of the winding core through the connecting piece and the positive current collector plate, which is set as the positive end of the battery.

[0007] As a further improvement of the present technology, a number of integrally stamped and formed welding parts protruding inwardly downward and evenly distributed in a circumference are provided on the positive current collector plate. Reinforcing ribs are formed between adjacent welding parts. Liquid through grooves penetrating both side walls are provided on both side walls of the reinforcing ribs. A downward-extending bending edge is provided at the outer edge of the positive current collector plate. The lower plane of the bending edge is in the same plane as the lower plane of the welding part. The lower plane of the welding part is laser pulse welded to the end face of the positive extreme of the winding core. Liquid through notches are provided at positions corresponding to the reinforcing ribs on the bending edge.

[0008] As a further improvement of the present technology, the steel shell is welded to the welding plate. The lower bottom surface of the positive pole column is welded to the connecting piece integrally. The connecting piece is welded to the upper plane of the positive current collector plate integrally.

[0009] As a further improvement of the present technology, the inner side surface of the lower end of the steel shell is welded to the negative current collector plate integrally. The negative current collector plate is welded to the negative extreme of the winding core integrally.

[0010] As a further improvement of the present technology, the outer side surface of the lower end of the steel shell is hermetically welded to the upper end face of the negative end cover. An upwardly concave circular sink integrally stamped and formed is provided in the middle of the lower bottom surface of the negative end cover. The liquid injection hole is provided in the middle of the bottom wall of the circular sink. The liquid injection plug is integrally stamped and formed, with the upper end sealed, hollow in the middle, and a downward-extending lower flange is provided at the lower edge. The upper plane of the lower flange is fitted to the bottom surface of the circular sink and hermetically welded into one body.

[0011] As a further improvement of the present technology, the welding plate, the negative end cap, and the liquid injection plug are all made of steel, the connecting piece, the positive electrode column, and the positive current collector plate are all made of aluminum, and the negative current collector plate is made of copper.

[0012] As a further improvement of the present technology, the insulating protective sleeve is made of PET engineering plastic, and the insulating partition is made of PPS engineering plastic.

[0013] As a further improvement of the present technology, a safety valve is provided on the negative end cap to play a role in safety explosion protection.

[0014] The present invention also provides a welding process for the above-mentioned novel cylindrical full-tab battery structure, which is characterized by including the following steps:

[0015] S1. Rivet and seal the insulating protective sleeve, the welding plate, the insulating partition, and the riveting washer to the positive electrode column to form a positive end cap;

[0016] S2. Connect the positive current collector plate to the positive end of the core through pulsed laser welding. Dozens of welding points are evenly distributed on the positive end face of the core, playing a good over-current role. The internal resistance of the battery is set to 2-3 milliohms;

[0017] S3. Connect the negative current collector plate to the negative end of the core through pulsed laser welding. Dozens of welding points are evenly distributed on the negative end face of the core, playing a good over-current role. The internal resistance of the battery is set to 2-3 milliohms;

[0018] S4. Laser-weld the lower end face of the positive electrode column and the connecting piece into one body; laser-weld the connecting piece and the positive current collector plate into one body;

[0019] S5. Socket the steel shell with the positive end cap, so that the lower bottom surface of the circular convex platform on the steel shell fits with the upper plane of the flange of the welding plate, and perform laser sealing welding;

[0020] S6. Socket the steel shell with the negative current collector plate, and perform laser sealing welding on the lower end face of the tapered bending edge of the negative current collector plate and the inner side surface of the lower end of the steel shell;

[0021] S7. Sleeve the negative end cap on the outer side surface of the lower end of the steel shell, and perform laser sealing welding on the upper end face of the negative end cap and the outer side surface of the lower end of the steel shell;

[0022] S8. Inject electrolyte into the battery through the liquid injection hole on the negative end cap, then insert the liquid injection plug into the liquid injection hole and the center hole of the core, and the upper plane of the lower flange fits with the bottom surface of the circular sink of the negative end cap, and perform laser sealing welding.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) By changing the structures of the negative end cap, negative current collector plate and steel shell, the negative end cap and the steel shell, and the steel shell and the negative current collector plate adopt the splicing continuous laser welding method, thereby reducing the welding difficulty, preventing false welding, and improving the product yield; 2) By changing the structures of the positive end cap and the steel shell, the welding plate of the positive end cap and the steel shell adopt the splicing continuous laser welding method, further reducing the welding difficulty, preventing false welding, and improving the product yield; 3) By changing the structure of the positive current collector plate, the structural strength of the positive current collector plate is enhanced, the flatness of the welding part is ensured, so that it is in good contact with the positive end face of the winding core, facilitating welding. The settings of the liquid through groove and the liquid through notch ensure uniform and sufficient infiltration of the electrolyte inside the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the present invention;

[0025] Figure 2 It is a schematic diagram of the welded structure of the positive end cap, positive current collector plate, steel shell and winding core group of an embodiment of the present invention;

[0026] Figure 3 It is a schematic diagram of the welded structure of the negative end cap, negative current collector plate and steel shell of an embodiment of the present invention;

[0027] Figure 4 It is a schematic explosion structure diagram of an embodiment of the present invention;

[0028] Figure 5 It is a schematic explosion structure diagram of the positive end cap of an embodiment of the present invention;

[0029] Figure 6 It is a schematic top view structure diagram of the negative end cap of an embodiment of the present invention;

[0030] Figure 7 It is a schematic structure diagram of the positive current collector plate of an embodiment of the present invention;

[0031] Figure 8 It is a schematic diagram of the comparison before and after riveting of the positive end cap of an embodiment of the present invention.

[0032] In the figure: 1. Steel shell, 101. Cover plate, 102. Circular boss, 103. Through hole, 2. Positive end cap, 201. Positive pole column, 201'. Positive pole column in the initial state, 202. Insulation protective sleeve, 203. Welding plate, 204. Insulation partition, 205. Riveting washer, 3. Connecting piece, 4. Positive current collector plate, 401. Welding part, 402. Reinforcing rib, 403. Liquid passage groove, 404. Bent edge, 405. Liquid passage notch, 5. Core roll, 6. Negative current collector plate, 601. Tapered bent edge, 7. Negative end cap, 701. Circular sunk groove, 702. Liquid injection hole, 8. Liquid injection plug, 9. Safety valve, 10. First weld seam, 11. Second weld seam, 12. Third weld seam, 13. Fourth weld seam. Specific implementation mode

[0033] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] Such as Figures 1 to 4As shown in the figure, an embodiment of the present invention includes a steel shell 1, a positive end cap 2, a positive current collector plate 4, a negative end cap 7, a negative current collector plate 6, and a winding core 5. The winding core 5 is disposed inside the steel shell 1. The positive end cap 2 is electrically connected to the positive end of the winding core 5 through the positive current collector plate 4, and the steel shell 1 is electrically connected to the negative end of the winding core 5 through the negative current collector plate 6.

[0037] As Figure 1 , 3 shown in the figure, the lower end of the steel shell 1 is open. The lower end face of the negative end of the winding core 5 and the upper plane of the negative current collector plate 6 are integrally welded by pulsed laser. A tapered bending edge 601 extending downward is provided at the outer edge of the negative current collector plate 6. The lower end of the tapered bending edge 601 is integrally welded to the inner side surface of the lower end of the steel shell 1 by continuous laser welding, so that the steel shell 1 is negatively charged and set as the negative end of the battery. The negative end cap 7 is sleeved on the outer side surface of the lower end of the steel shell 1, and the upper end is integrally welded to the outer side surface of the lower end of the steel shell 1 by continuous laser welding. A liquid injection hole 701 coaxial with the central hole of the winding core 5 is provided in the middle. After the battery is filled with electrolyte, a liquid injection plug 8 is inserted into the liquid injection hole 701 and sealed by continuous laser welding.

[0038] By changing the structures of the negative end cap 7, the negative current collector plate 6, and the steel shell 1, the present invention adopts a splicing continuous laser welding method for both the negative end cap 7 and the steel shell 1, and the steel shell 1 and the negative current collector plate 6, thereby reducing the welding difficulty, preventing false soldering, and improving the product yield.

[0039] As Figure 1 , 3As shown in the figure, the upper end of the steel shell 1 is provided with an integrally formed cover plate 101. In the middle of the cover plate 101, there is an integrally formed circular boss 102 with an equal wall thickness protruding upward. A through hole 103 is provided in the middle of the circular boss 102. The positive end cover 2 includes a positive electrode post 201, an insulating protective sleeve 202, a welding plate 203, a riveting washer 205 and an insulating partition 204. The positive electrode post 201 is arranged in the through hole 103. The insulating protective sleeve 202 is arranged in the through hole 103 and sleeved on the outer side surface of the positive electrode post 201. The welding plate 103 is sleeved on the outer side surface of the insulating protective sleeve 202. The outer edge of the upper end of the welding plate 203 is provided with a flange extending outward. The upper plane of the flange is fixedly connected to the lower bottom surface of the circular boss 102. The insulating partition 204 is sleeved on the outer side surface of the insulating protective sleeve 202, located below the welding plate 203, and the outer edge is provided with a bent edge extending downward. The riveting washer 205 is sleeved on the outer side surface of the insulating protective sleeve 202, located below the insulating partition 204. The insulating protective sleeve 202, the welding plate 203, the insulating partition 204, the riveting washer 205 and the positive electrode post 201 are hermetically and fixedly connected into one body by riveting. A connecting piece 3 is fixedly connected to the lower bottom surface of the positive electrode post 201. The lower plane of the connecting piece 3 and the upper plane of the positive current collector plate 4 are integrally formed by laser welding. The lower plane of the positive current collector plate 4 and the positive end face of the winding core 5 are integrally formed by pulsed laser welding. The positive electrode post 201 is conducted with the positive end of the winding core 5 through the connecting piece 3 and the positive current collector plate 4, which is set as the positive end of the battery.

[0040] In the present invention, the positive electrode post is insulated from the negative steel shell by the insulating protective sleeve 202 and the insulating partition 204 to prevent the battery from short - circuiting.

[0041] In the present invention, by changing the structures of the positive end cover 2 and the steel shell 1, the welding plate 202 of the positive end cover and the steel shell 1 adopt a splicing continuous laser welding method, which further reduces the welding difficulty, prevents false soldering and improves the product yield.

[0042] As Figure 7 shown, the positive current collector plate 4 is provided with a number of integrally stamped and formed welding parts 401 protruding downward inside and evenly distributed in a circumferential manner. Reinforcing ribs 402 are formed between adjacent welding parts 401. Liquid - through grooves 403 penetrating both side walls are provided on both side walls of the reinforcing ribs 402. The outer edge of the positive current collector plate 4 is provided with a bent edge 404 extending downward. The lower plane of the bent edge 404 and the lower plane of the welding part 401 are in the same plane. The lower plane of the welding part 401 and the positive end face of the winding core 5 are integrally formed by laser pulse welding. Liquid - through notches 405 are provided at positions corresponding to the reinforcing ribs 402 on the bent edge 404.

[0043] The present invention enhances the structural strength of the positive electrode current collecting disc 4 by changing the structure of the positive electrode current collecting disc 4, ensures the flatness of the welding portion 401, makes it in good contact with the positive terminal end face of the winding core 5, and facilitates welding. The arrangement of the liquid through groove 403 and the liquid through notch 405 ensures that the electrolyte inside the battery is evenly and fully infiltrated.

[0044] like Figure 3 As shown, a circular recessed groove 702 which is concave upward and formed by stamping is provided in the middle of the lower bottom surface of the negative terminal cover 7, a liquid injection hole 701 is provided in the middle of the bottom wall of the circular recessed groove 702, and a liquid injection plug 8 is formed by stamping in one piece, with a sealed upper end, a hollow middle, and a lower flange extending outward at the lower end edge, and an upper plane of the lower flange is in contact with the bottom surface of the circular recessed groove 702, and they are sealed and welded into one.

[0045] like Figure 6 As shown, a safety valve 9 is provided on the negative terminal cover 7 to play a role in safety and explosion prevention.

[0046] Preferably, the welding plate 203, the negative terminal cover 7, and the injection plug 8 are all made of steel, the connecting piece 3, the positive electrode column 201, and the positive current collecting disc 4 are all made of aluminum, and the negative current collecting disc 6 is made of copper.

[0047] Preferably, the insulating protective sleeve 202 is made of PET engineering plastic, and the insulating partition 204 is made of PPS engineering plastic.

[0048] The welding process embodiment of the present invention comprises the following steps:

[0049] S1, the insulating protective sleeve 202, the welding plate 203, the insulating partition 204 and the riveting washer 205 are connected to the outer circumferential surface of the positive electrode column 201' in the initial state (such as Figure 8 Before riveting), then riveting the seal to form the positive terminal cover (as shown Figure 8 After riveting);

[0050] S2, connect the positive current collector 4 and the positive end of the winding core 5 by pulse laser welding, and weld dozens of welding points evenly distributed on the positive end surface of the winding core 5, which plays a good role in current flow, and the internal resistance of the battery is set to 2-3 milliohms;

[0051] S3, connect the negative electrode current collector 6 to the negative end of the winding core 5 by pulse laser welding, and weld dozens of welding points evenly distributed on the negative end surface of the winding core 5, which plays a good role in current flow, and the internal resistance of the battery is set to 2-3 milliohms;

[0052] S4, the lower end surface of the positive electrode column 201 and the connecting piece 3 are laser welded into one; the connecting piece 3 and the positive electrode current collecting plate 4 are laser welded into one;

[0053] S5. Socket the steel shell 1 with the positive end cap 2, make the lower bottom surface of the circular boss 103 on the steel shell 1 fit with the upper plane of the flange of the welding plate 203, and adopt laser seal welding (see Figure 2 the first weld seam 10 in

[0054] S6. Socket the steel shell 1 with the negative current collector plate 6, and adopt laser seal welding for the lower end surface of the tapered bending edge 601 of the negative current collector plate 6 and the inner side surface of the lower end of the steel shell 1 (see Figure 3 the fourth weld seam 13 in

[0055] S7. Sleeve the negative end cap 7 on the outer side surface of the lower end of the steel shell 1, and adopt laser seal welding for the upper end surface of the negative end cap 7 and the outer side surface of the lower end of the steel shell 1 (see Figure 3 the second weld seam 11 in

[0056] S8. Inject electrolyte into the battery through the liquid injection hole 701 on the negative end cap 7, then insert the liquid injection plug 8 into the liquid injection hole 701 and the central hole of the wound core 5, and make the upper plane of the lower flange fit with the bottom surface of the circular sink 702 of the negative end cap 7, and adopt laser seal welding (see Figure 3 the third weld seam 12 in

[0057] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A new type of cylindrical all-tab battery structure, comprising a steel shell, a positive end cap, a positive current collector plate, a negative end cap, a negative current collector plate and a wound core. The wound core is arranged inside the steel shell. The positive end cap is electrically connected to the positive end of the wound core through the positive current collector plate, and the steel shell is electrically connected to the negative end of the wound core through the negative current collector plate. It is characterized in that: The lower end of the steel shell is open. The lower end face of the negative electrode end of the winding core is fixedly connected to the upper plane of the negative electrode current collector plate. The outer edge of the negative electrode current collector plate is provided with a downwardly extending tapered bending edge, and the lower end of the tapered bending edge is fixedly connected to the inner side surface of the lower end of the steel shell. The steel shell is negatively charged and is set as the negative electrode end of the battery. The negative electrode end cover is sleeved on the outer side surface of the lower end of the steel shell, and the upper end is fixedly connected to the outer side surface of the lower end of the steel shell. A liquid injection hole coaxial with the central hole of the winding core is provided in the middle, and a liquid injection plug is arranged in the liquid injection hole for sealing; The inner side surface of the lower end of the steel shell is integrally welded with the negative electrode current collector plate, and the negative electrode current collector plate is integrally welded with the negative electrode end of the winding core; The outer side surface of the lower end of the steel shell is integrally and hermetically welded with the upper end surface of the negative electrode end cover; in the middle of the lower bottom surface of the negative electrode end cover, there is a circular sunk groove that is integrally stamped and formed and concave upward. The liquid injection hole is arranged in the middle of the bottom wall of the circular sunk groove. The liquid injection plug is integrally stamped and formed, with the upper end sealed, hollow in the middle, and a downwardly extending lower flange is provided at the lower edge. The upper plane of the lower flange is attached to the bottom surface of the circular sunk groove and is integrally and hermetically welded; 2. A novel cylindrical all - tab battery structure according to claim 1, characterized in that: The upper end of the steel shell is provided with an integrally formed cover plate. In the middle of the cover plate, there is an integrally formed circular boss with equal wall thickness protruding upward. A through hole is provided in the middle of the circular boss. The positive electrode end cover includes a positive electrode terminal, an insulating protective sleeve, a welding plate, a riveting washer, and an insulating partition. The positive electrode terminal is arranged in the through hole. The insulating protective sleeve is arranged in the through hole and sleeved on the outer side surface of the positive electrode terminal. The welding plate is sleeved on the outer side surface of the insulating protective sleeve. The outer edge of the upper end of the welding plate is provided with an outwardly extending flange. The upper plane of the flange is fixedly connected to the lower bottom surface of the circular boss. The insulating partition is sleeved on the outer side surface of the insulating protective sleeve, located below the welding plate, and the outer edge is provided with a downwardly extending bending edge. The riveting washer is sleeved on the outer side surface of the insulating protective sleeve, located below the insulating partition. The insulating protective sleeve, the welding plate, the insulating partition, the riveting washer, and the positive electrode terminal are hermetically and fixedly connected into one body by riveting. A connecting piece is fixedly connected to the lower bottom surface of the positive electrode terminal. The lower plane of the connecting piece is fixedly connected to the upper plane of the positive electrode current collector plate. The lower plane of the positive electrode current collector plate is fixedly connected to the end face of the positive electrode end of the winding core. The positive electrode terminal is conducted through the connecting piece, the positive electrode current collector plate, and the positive electrode end of the winding core, and is set as the positive electrode end of the battery.

3. A novel cylindrical all - tab battery structure according to claim 2, characterized in that: On the positive electrode current collector plate, there are a plurality of integrally stamped and formed downwardly protruding welding parts that are circumferentially evenly distributed. A reinforcing rib is formed between adjacent welding parts. Liquid through grooves penetrating both side walls are provided on both side walls of the reinforcing rib. The outer edge of the positive electrode current collector plate is provided with a downwardly extending bending edge. The lower plane of the bending edge is in the same plane as the lower plane of the welding part. The lower plane of the welding part and the end face of the positive electrode end of the winding core are laser pulse welded. Liquid through notches are provided at positions corresponding to the reinforcing ribs on the bending edge.

4. A novel cylindrical all - tab battery structure according to claim 2, characterized in that: The steel shell is welded and connected to the welding plate. The lower bottom surface of the positive electrode terminal is integrally welded with the connecting piece. The connecting piece is integrally welded with the upper plane of the positive electrode current collector plate.

5. A novel cylindrical all-pole-ear battery structure according to claim 2, characterized in that: The welding plate, the negative electrode end cover, and the liquid injection plug are all made of steel. The connecting piece, the positive electrode terminal, and the positive electrode current collector plate are all made of aluminum. The negative electrode current collector plate is made of copper.

6. A novel cylindrical all - tab battery structure according to claim 2, characterized in that: The insulating protective sleeve is made of PET engineering plastic, and the insulating partition is made of PPS engineering plastic.

7. A novel cylindrical all - tab battery structure according to claim 1, characterized in that: A safety valve is provided on the negative end cover, which plays a role in safety explosion prevention.

8. A welding process for a new cylindrical all-tab battery structure according to any one of claims 2 to 7, characterized in that It includes the following steps: S1. Rivet and seal the insulating protective sleeve, welding plate, insulating partition and riveting washer to the positive electrode post to form a positive end cover. S2. Connect the positive current collector plate and the positive end of the winding core by pulsed laser welding. Dozens of welding points are evenly distributed on the positive end face of the winding core, playing a good role in current conduction. The internal resistance of the battery is set to 2 - 3 milliohms. S3. Connect the negative current collector plate and the negative end of the winding core by pulsed laser welding. Dozens of welding points are evenly distributed on the negative end face of the winding core, playing a good role in current conduction. The internal resistance of the battery is set to 2 - 3 milliohms. S4. Laser weld the lower end face of the positive electrode post and the connecting piece into one body; laser weld the connecting piece and the positive current collector plate into one body. S5. Sleeve the steel shell on the positive end cover, make the lower bottom surface of the circular boss on the steel shell fit with the upper plane of the flange of the welding plate, and perform laser seal welding. S6. Sleeve the steel shell on the negative current collector plate, and perform laser seal welding on the lower end face of the tapered bending edge of the negative current collector plate and the inner side surface of the lower end of the steel shell. S7. Sleeve the negative end cover on the outer side surface of the lower end of the steel shell, and perform laser seal welding on the upper end face of the negative end cover and the outer side surface of the lower end of the steel shell. S8. Inject electrolyte into the battery through the liquid injection hole on the negative end cover, then insert the liquid injection plug into the liquid injection hole and the central hole of the winding core. The upper plane of the lower flange fits with the bottom surface of the circular sink of the negative end cover, and perform laser seal welding.

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