Cylindrical battery and manufacturing method thereof

Abstract

The present invention provides a cylindrical battery and a manufacturing method thereof, including a shell assembly and a No. 1 busbar, a connector, a battery cell, a No. 2 busbar, an elastic clamp, a sealing ring and a cover plate which are sequentially installed from bottom to top, the cover plate being pressed and connected to the shell assembly, a pole being provided at the bottom of the shell assembly, a pole through hole being provided at the center of the pole, a shell roller groove being provided above the shell assembly, the shell roller groove being pressed and connected to the No. 2 busbar, the inner wall of the No. 2 busbar being pressed and connected to the elastic adjusting member, a No. 1 boss being provided in the middle of the No. 1 busbar, a connector being installed in the through hole of the No. 1 boss, the No. 1 boss being welded after passing through the pole through hole, the No. 1 busbar and the No. 2 busbar having different electrode polarities, and being respectively welded to the pole ears of corresponding polarities in the battery cell. The cylindrical battery and the manufacturing method thereof described in the present invention have a simple battery structure, simplified processing steps, improved manufacturing efficiency and reduced costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium batteries, and in particular relates to a cylindrical battery and a manufacturing method thereof. Background Art

[0002] The traditional cylindrical battery cover plate has a complex structure; the cap is used as the positive electrode and the shell is used as the negative electrode. When assembled into a battery module, the positive and negative electrodes are conductively connected from both ends of the cylindrical battery, which is not convenient for the design and welding of the external module or system busbar; in addition, the lack of pole ears affects the power performance of the battery. In addition, there are some new structures, where the pole is riveted at the bottom of the U-shaped shell, and the busbar and the shell need to be welded by laser penetration welding. The processing and manufacturing requirements are high and it is not easy to detect the welding quality; the shell notch side is laser welded with the electrode busbar at the roller groove, which affects the strength of the roller groove and the process is complicated. Disadvantages of the existing technology: 1. The pole is penetrated by welding or resistance welding, and the process control is difficult, and the welding quality is difficult to detect; 2. The method of welding a boss on the No. 1 busbar requires welding, and the equipment investment cost is high and the efficiency is low; 3. The No. 2 busbar and the shell are laser welded at the roller groove, which is difficult to weld, easily affects the strength of the roller groove, and the efficiency is relatively low; 4. The winding core is fixed by the roller groove or fixed by expansion tape. When the diameter of the battery cell increases, the reliability is not high. Summary of the invention

[0003] In view of this, the present invention aims to provide a cylindrical battery to solve the problems of the existing battery having a complex structure, high requirements on the manufacturing process and low production efficiency.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A cylindrical battery comprises a shell assembly and a No. 1 busbar, a connector, a battery cell, a No. 2 busbar, an elastic pressing member, a sealing ring and a cover plate which are sequentially installed from bottom to top, the cover plate being pressed and connected to the shell assembly, a pole is provided at the bottom of the shell assembly, a pole through hole is provided at the center of the pole, a shell roller groove is provided above the shell assembly, the shell roller groove is pressed and connected to the No. 2 busbar, the inner wall of the No. 2 busbar is pressed and connected to the elastic adjusting member, a No. 1 boss is provided in the middle of the No. 1 busbar, a connector is installed in the through hole of the No. 1 boss, the No. 1 boss is welded after passing through the pole through hole, the top of the No. 1 busbar is welded to the positive pole ear of the battery cell, and the negative pole ear of the battery cell is welded to the No. 2 busbar.

[0006] Furthermore, the cover plate is a disc structure, a cover plate protrusion is provided on one side of the cover plate close to the shell assembly, and a liquid injection hole is provided on the cover plate.

[0007] Furthermore, the elastic clamping member includes an integrated bottom plate, a spring sheet and a spring sheet protrusion. The bottom plate is a disc structure, a spring sheet protrusion is provided at the center of the bottom plate, a through hole is provided inside the spring sheet protrusion, and a plurality of spring sheets are evenly distributed at the outer edge of the bottom plate.

[0008] Furthermore, the elastic adjusting member is an elastic disc or an elastic ring or a ring with a notch or a disc with an opening.

[0009] Furthermore, the No. 2 convergence plate includes a convergence plate body and a convergence plate flange of an integrated structure. The convergence plate body is a circular disc structure, a circle of convergence plate flange is provided at the edge of the convergence plate body, a No. 2 boss is provided in the middle of the convergence plate body, a through hole is provided in the middle of the No. 2 boss, and a number of No. 2 through holes are evenly distributed around the No. 2 boss.

[0010] Furthermore, the shell assembly includes a shell and a pole. The shell is a hollow cylindrical structure with an opening at the top. A shell center hole is provided at the center of the shell bottom. The shell center hole is riveted to the pole. A pole through hole is provided at the center of the pole. A shell roller groove is provided above the shell.

[0011] Furthermore, the polarities of the shell and the pole are opposite. When the shell is a steel shell, the shell is the negative pole, the No. 1 busbar is the positive busbar, the No. 2 busbar is the negative busbar, and the pole is the positive pole; the top of the No. 1 busbar is welded to the positive pole ear of the battery cell, and the negative pole ear of the battery cell is welded to the No. 2 busbar to form a battery cell assembly; when the shell is an aluminum shell, the shell is the positive pole, the No. 1 busbar is the negative busbar, the No. 2 busbar is the positive busbar, and the pole is the negative pole; the top of the No. 1 busbar is welded to the negative pole ear of the battery cell, and the positive pole ear of the battery cell is welded to the No. 2 busbar to form a battery cell assembly.

[0012] Furthermore, the No. 1 busbar is a disc structure, with a No. 1 boss provided at the center, a number of No. 1 through holes evenly distributed circumferentially on the No. 1 boss, and a through hole provided on the No. 1 boss for pressing in the connector, so that the No. 1 boss and the connector form a T-shaped boss structure, the T-head part of the T-shaped boss structure is welded to the positive pole ear of the battery cell, and the cylindrical part of the T-shaped boss structure is used to pass through the pole through hole.

[0013] Compared with the prior art, the cylindrical battery of the present invention has the following advantages:

[0014] (1) The cylindrical battery of the present invention has a simple structure and can locate the positive and negative electrodes of the battery on the same side, which is convenient for the design and welding of external modules or system buses and improves the rate performance of the battery cell.

[0015] (2) The cylindrical battery described in the present invention has a connecting piece that is tightly fitted and fixed to the No. 1 boss, which is easy to operate, improves manufacturing efficiency, and reduces production costs.

[0016] Another object of the present invention is to provide a method for manufacturing a cylindrical battery to solve the problems of complicated steps, high process requirements and low production efficiency in the existing process.

[0017] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0018] A method for manufacturing a cylindrical battery comprises the following steps:

[0019] S1. A shell center hole is left at the bottom of the shell, and a pole is pre-riveted at the position of the shell center hole to form a shell assembly;

[0020] S2, the connector is inserted and pressed from the back of the No. 1 boss to form the No. 1 busbar assembly;

[0021] S3, laser welding the T-head part of the No. 1 boss to the positive / negative pole tab of the battery cell, and laser welding the No. 2 busbar to the negative / positive pole tab of the battery cell to form a winding core assembly;

[0022] S4. Insert the winding core assembly into the shell from the opening direction of the shell, and after the cylindrical part of the No. 1 boss passes through the pole through hole and is tightly connected to the pole through hole, laser welding is performed at the matching part of the pole through hole to connect the pole with the No. 1 boss and the connecting piece;

[0023] S5. Roll grooves are performed on the upper surface of the negative electrode of the battery cell on the shell. During the rolling groove process, the vertical side of the No. 2 busbar is deformed synchronously to form a fastening with the elastic adjusting member;

[0024] S6. Place an elastic pressing piece on the No. 2 busbar, then put in the sealing ring, then put in the cover plate and press it tightly, then fold the shell inwards to press the cover plate tightly.

[0025] Furthermore, a No. 1 boss is punched out in the middle of the No. 1 busbar, and a connecting piece is pressed into the middle of the No. 1 boss.

[0026] Compared with the prior art, the method for manufacturing a cylindrical battery according to the present invention has the following beneficial effects:

[0027] (1) In the method for manufacturing cylindrical batteries described in the present invention, the connection method between the No. 2 busbar and the shell has the functions of electrical conduction and thermal conduction. The process is easy to order, highly efficient, and has low equipment investment cost.

[0028] (2) In the manufacturing method of the cylindrical battery described in the present invention, a No. 1 busbar is punched out with a No. 1 boss and a connector is pressed into it, which plays a role in positioning, conducting electricity and sealing. There is no need to increase the boss form by welding, and the process is simple and the cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 An exploded view of a cylindrical battery according to an embodiment of the present invention;

[0031] Figure 2 A cross-sectional view of a cylindrical battery according to an embodiment of the present invention;

[0032] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0033] Figure 4 is a cross-sectional view of a housing assembly according to an embodiment of the present invention;

[0034] Figure 5 for Figure 4 Enlarged view of middle part B;

[0035] Figure 6 A schematic diagram of a busbar No. 1 according to an embodiment of the present invention;

[0036] Figure 7 A side view of a busbar No. 1 according to an embodiment of the present invention;

[0037] Figure 8 is a schematic diagram of a No. 2 busbar according to an embodiment of the present invention;

[0038] Fig. 9 is a cross-sectional view of a No. 2 busbar according to an embodiment of the present invention;

[0039] Fig.10 A schematic diagram of an elastic adjusting member according to an embodiment of the present invention;

[0040] Fig.11 A schematic diagram of an elastic pressing member according to an embodiment of the present invention;

[0041] Fig.12 is a cross-sectional view of the elastic pressing member according to an embodiment of the present invention;

[0042] Fig.13 It is a schematic diagram of a cover plate according to an embodiment of the present invention.

[0043] Description of reference numerals:

[0044] 1-shell assembly; 11-shell; 12-pole; 13-pole through hole; 14-shell roller groove; 2-No. 1 busbar; 21-No. 1 boss; 22-No. 1 through hole; 3-connector; 4-battery cell; 5-No. 2 busbar; 51-busbar body; 52-busbar flange; 53-No. 2 through hole; 54-No. 2 boss; 6-elastic adjustment member; 7-elastic clamping member; 71-bottom plate; 72-spring; 73-spring protrusion; 8-sealing ring; 9-cover plate; 91-cover plate protrusion; 92-liquid injection hole. DETAILED DESCRIPTION

[0045] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0048] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0049] A cylindrical battery, such as Figures 1 to 13 As shown, it includes a shell assembly 1 and a No. 1 busbar 2, a connector 3, a battery cell 4, a No. 2 busbar 5, an elastic pressing member 7, a sealing ring 8 and a cover plate 9 installed in sequence from bottom to top. The cover plate 9 is pressed and connected to the shell assembly 1. A pole 12 is provided at the bottom of the shell assembly 1, and a pole through hole 13 is provided at the center of the pole 12. A shell roller groove 14 is provided above the shell assembly 1. The shell roller groove 14 is pressed and connected to the No. 2 busbar 2. The inner wall of the No. 2 busbar 2 is pressed and connected to the elastic adjusting member 6. A No. 1 boss 21 is provided in the middle of the No. 1 busbar 2. A connector 3 is installed in the through hole of the No. 1 boss 21. The connector 3 plays a sealing role. The No. 1 boss 21 passes through the pole through hole 13 and is welded. The No. 1 busbar 2 and the No. 2 busbar 5 have different polarities and are respectively welded to the pole ears of corresponding polarities in the battery cell 4.

[0050] The cylindrical lithium-ion battery has a simple structure and can locate the positive and negative electrodes of the battery on the same side, which is convenient for the design and welding of external modules or system buses, simplifies the assembly process, and improves the rate performance of the battery cell.

[0051] The shell assembly 1 includes a shell 11 and a pole 12. The shell 11 is a hollow cylindrical structure with an opening at the top. A shell center hole is provided at the center of the bottom of the shell 11. The shell center hole is riveted to the pole 12. A pole through hole 13 is provided at the center of the pole 12. A shell roller groove 14 is provided above the shell 11. The pole 12 is reserved through the shell 11 to conduct electricity to the same end, which is convenient for the design and welding of the bus when forming a module or system. The pole 12 also has a pole through hole 13, which cooperates with the No. 1 boss 21 and is welded to the pole 12 on the top of the No. 1 boss 21, which has a conductive and sealing effect. Compared with laser penetration welding, the welding quality is more guaranteed, and compared with resistance welding, the resistance is smaller and the stability is better.

[0052] The polarities of the shell 11 and the pole 12 are opposite. When the shell 11 is a steel shell, the shell 11 is the negative pole, the No. 1 busbar 2 is the positive busbar, the No. 2 busbar 5 is the negative busbar, and the pole 12 is the positive pole; the top of the No. 1 busbar 2 is welded to the positive pole ear of the battery cell 4, and the negative pole ear of the battery cell 4 is welded to the No. 2 busbar 5 to form a battery cell assembly; when the shell 11 is an aluminum shell, the shell 11 is the positive pole, the No. 1 busbar 2 is the negative busbar, the No. 2 busbar 5 is the positive busbar, and the pole 12 is the negative pole; the top of the No. 1 busbar 2 is welded to the negative pole ear of the battery cell 4, and the positive pole ear of the battery cell 4 is welded to the No. 2 busbar 5 to form a battery cell assembly.

[0053] Since the shell 11 of the present solution adopts different materials, the polarity of the shell is different, and therefore the polarity of the battery cell 4 ears welded thereto is also different. For the sake of easy understanding, the following description in this case is "the shell 11 is the negative pole, the No. 1 busbar 2 is the positive busbar, the No. 2 busbar 5 is the negative busbar, and the pole 12 is the positive pole".

[0054] The No. 1 busbar 2 is a disc structure, with a No. 1 boss 21 provided at the center thereof, and a number of No. 1 through holes 22 evenly distributed circumferentially on the No. 1 boss 21, the No. 1 through holes 22 being used to penetrate the electrolyte, and the No. 1 boss 21 being provided with a through hole, and the through hole being inserted into the connector 3, the two being tightly fitted and fixed, so that the No. 1 boss 21 and the connector 3 form a T-shaped boss structure, and the connector 3 seals the through hole, which is easy to operate, and the T-portion of the T-shaped boss structure is welded to the positive pole ear of the battery cell 4, and after the cylindrical portion of the T-shaped boss structure passes through the pole through hole 13 of the pole 12, laser welding is performed at the fitting position of the pole through hole 13, so that the pole 12 is connected with the No. 1 boss 21 and the connector 3 for conductivity and sealing.

[0055] Preferably, the first through hole 22 is a U-shaped structure.

[0056] The connecting member 3 is made of a metal block.

[0057] The No. 2 busbar 5 includes a busbar body 51 and a busbar flange 52 of an integrated structure. The busbar body 51 is a disc structure. A circle of busbar flange 52 is provided at the edge of the busbar body 51. A No. 2 boss 54 is provided in the middle of the busbar body 51. A through hole is provided in the middle of the No. 2 boss 54. A number of No. 2 through holes 53 are evenly distributed around the No. 2 boss 54. The No. 2 through holes 53 are used to penetrate electrolyte. The No. 2 boss 54 is welded to the negative pole ear of the battery cell 4.

[0058] The elastic adjusting member 6 is an elastic disc or an elastic ring or a ring structure with a notch or a disc structure with an opening. When an elastic disc or an elastic ring is used, the material is required to have relatively high elasticity and strength, such as rubber, plastic or metals such as copper, steel, nickel, iron, and aluminum.

[0059] In one embodiment, the elastic adjusting member 6 is a circular ring, and the circular ring is provided with a notch, the notch is an inwardly rolled arc, and the notch is used to absorb the compression tolerance.

[0060] The elastic clamping member 7 includes a bottom plate 71, a spring piece 72 and a spring piece protrusion 73 of an integral structure. The bottom plate 71 is a disc structure. A spring piece protrusion 73 is provided at the center of the bottom plate 71. A through hole is provided inside the spring piece protrusion 73. A plurality of spring pieces 72 are evenly distributed at the outer edge of the bottom plate 71. In one embodiment, the spring piece 72 is in the shape of a fan blade, and the cross section of the spring piece 72 is arc-shaped. The elastic clamping member 7 is placed above the No. 2 busbar 5; an elastic member is added between the cover plate 9 and the No. 2 busbar 5 to clamp the battery cell 4 so that it does not move. This is more reliable than simply fixing it with a roller groove or a coil core wrapped with a circle of expansion tape. The effect is particularly significant when the diameter of the battery cell is relatively large.

[0061] The elastic pressing member 7 is made of a rubber ring, a foam copper mesh, a steel spring sheet or other elastic special-shaped members.

[0062] The cover plate 9 is a disc structure, and a cover plate protrusion 91 is provided on the side of the cover plate 9 close to the shell 11. When the cover plate 9 is sealed, it can press the elastic pressing piece 7 on the second busbar 5 to fix the battery cell 4. The cover plate 9 is provided with a liquid injection hole 92 for liquid injection and exhaust after the first formation, and can also be used to replenish the electrolyte after the first charge.

[0063] A method for manufacturing a cylindrical battery comprises the following steps:

[0064] S1, a shell center hole is left at the bottom of the shell 11, and a pole 12 is pre-riveted at the position of the shell center hole to form a shell assembly 1;

[0065] S2. The connector 3 is inserted and pressed from the back of the No. 1 boss 21 to form a No. 1 busbar assembly; preferably, the No. 1 busbar assembly can be assembled at the cell production site or at the supplier;

[0066] S3, laser welding the T-head portion of the No. 1 boss 21 to the positive electrode tab of the battery cell 4, and laser welding the No. 2 busbar 5 to the negative electrode tab of the battery cell 4 to form a winding core assembly;

[0067] S4, the winding core assembly is inserted into the shell 1 from the opening direction of the shell 11, and the cylindrical part of the No. 1 boss 21 passes through the pole through hole 13 and is pressed against the pole through hole 13, and then laser welding is performed at the matching part of the pole through hole 13 to connect the pole 12 with the No. 1 boss 21 and the connector 3 for conduction and sealing;

[0068] S5, then roll grooves are performed on the negative electrode of the battery cell 4 on the shell 11. During the rolling groove process, the vertical side of the No. 2 busbar 5 is synchronously deformed and fastened with the elastic adjusting member 6; the No. 2 busbar and the shell are tightly connected through the internal clamping member and the rolling groove, which is highly efficient;

[0069] S6. Place the elastic pressing piece 7 on the No. 2 busbar 5, then put in the sealing ring 8, then put in the cover plate 9 and press it tightly, then fold the shell 11 inwards to press the cover plate 9 tightly; after pressing and connecting, welding can be added to improve the conductivity.

[0070] In this scheme, the connection method of the No. 2 busbar 5 and the shell 11 (i.e., the compression connection through the shell roller groove 14 / No. 2 busbar 5 / elastic adjustment member 6) enables the negative electrode to be electrically connected to the shell 11, and has conductive and thermal conductive effects. This process is easy to accept orders, has high efficiency, and has low equipment investment cost.

[0071] A No. 1 boss 21 is punched out in the middle of the No. 1 busbar 2, and a columnar or T-shaped connector 3 matching the No. 1 boss 21 is filled in the middle of the No. 1 boss 21. The connector 3 is tightly matched and fixed with the No. 1 boss 21, which is simple to operate, improves manufacturing efficiency, and reduces production costs. The No. 1 busbar 2 plays a positioning role and a conductive and sealing role by punching out the No. 1 boss 21 and pressing in a connector 3. There is no need to increase the boss form by welding, and the process is simple and the cost is low.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylindrical battery, characterized in that: It includes a shell assembly and a No. 1 busbar, a connector, a battery cell, a No. 2 busbar, an elastic pressing member, a sealing ring and a cover plate which are sequentially installed from bottom to top. The cover plate is pressed and connected with the shell assembly. A pole is provided at the bottom of the shell assembly. A pole through hole is provided at the center of the pole. A shell roller groove is provided above the shell assembly. The shell roller groove is pressed and connected with the No. 2 busbar. The inner wall of the No. 2 busbar is pressed and connected with the elastic adjusting member. A No. 1 boss is provided in the middle of the No. 1 busbar. A connector is installed in the through hole of the No. 1 boss. The No. 1 boss passes through the pole through hole and is welded. The electrode polarities of the No. 1 busbar and the No. 2 busbar are different and are respectively welded to the pole ears of corresponding polarities in the battery cell. The cover plate is a disc structure, a cover plate protrusion is provided on one side of the cover plate close to the shell assembly, and a liquid injection hole is provided on the cover plate; the elastic adjusting member is an elastic disc or an elastic ring or a ring with a notch or a disc with an opening.

2. A cylindrical battery according to claim 1, characterized in that: The elastic clamping member includes an integrated bottom plate, a spring sheet and a spring sheet protrusion. The bottom plate is a disc structure. A spring sheet protrusion is arranged at the center of the bottom plate. A through hole is arranged inside the spring sheet protrusion. Several spring sheets are evenly distributed at the outer edge of the bottom plate.

3. A cylindrical battery according to claim 1, characterized in that: The No. 2 convergence plate includes a convergence plate body and a convergence plate flange of an integrated structure. The convergence plate body is a disc structure, a circle of convergence plate flange is provided at the edge of the convergence plate body, a No. 2 boss is provided in the middle of the convergence plate body, a through hole is provided in the middle of the No. 2 boss, and a number of No. 2 through holes are evenly distributed around the No. 2 boss.

4. A cylindrical battery according to claim 1, characterized in that: The shell assembly includes a shell and a pole. The shell is a hollow cylindrical structure with an opening at the top. A shell center hole is provided at the center of the shell bottom. The shell center hole is riveted to the pole. A pole through hole is provided at the center of the pole. A shell roller groove is provided above the shell.

5. A cylindrical battery according to claim 4, characterized in that: The polarity of the shell and the pole is opposite. When the shell is a steel shell, the shell is the negative pole, the No. 1 busbar is the positive busbar, the No. 2 busbar is the negative busbar, and the pole is the positive pole; the top of the No. 1 busbar is welded to the positive pole ear of the battery cell, and the negative pole ear of the battery cell is welded to the No. 2 busbar to form a battery cell assembly; when the shell is an aluminum shell, the shell is the positive pole, the No. 1 busbar is the negative busbar, the No. 2 busbar is the positive busbar, and the pole is the negative pole; the top of the No. 1 busbar is welded to the negative pole ear of the battery cell, and the positive pole ear of the battery cell is welded to the No. 2 busbar to form a battery cell assembly.

6. A cylindrical battery according to claim 1, characterized in that: The No. 1 busbar is a disc structure, with a No. 1 boss provided in the center, and a number of No. 1 through holes evenly distributed around the No. 1 boss. The No. 1 boss is provided with a through hole, which is used to press the connector into the No. 1 boss, so that the No. 1 boss and the connector form a T-shaped boss structure, and the T-head part of the T-shaped boss structure is welded to the pole ear of the battery cell, and the cylindrical part of the T-shaped boss structure is used to pass through the pole through hole.

7. A method for manufacturing a cylindrical battery according to any one of claims 1 to 6, characterized in that: The steps include: S1. A shell center hole is left at the bottom of the shell, and a pole is pre-riveted at the position of the shell center hole to form a shell assembly; S2, the connector is inserted and pressed from the back of the No. 1 boss to form the No. 1 busbar assembly; S3, laser welding the T-head part of the No. 1 boss to the positive / negative pole tab of the battery cell, and laser welding the No. 2 busbar to the negative / positive pole tab of the battery cell to form a winding core assembly; S4. Insert the winding core assembly into the shell from the opening direction of the shell, and after the cylindrical part of the No. 1 boss passes through the pole through hole and is tightly connected to the pole through hole, laser welding is performed at the matching part of the pole through hole to connect the pole with the No. 1 boss and the connecting piece; S5. Roll grooves are performed on the upper surface of the negative electrode of the battery cell on the shell. During the rolling groove process, the vertical side of the No. 2 busbar is deformed synchronously to form a fastening with the elastic adjusting member; S6. Place an elastic pressing piece on the No. 2 busbar, then put in the sealing ring, then put in the cover plate and press it tightly, then fold the shell inwards to press the cover plate tightly.

8. The method for manufacturing a cylindrical battery according to claim 7, characterized in that: A No. 1 boss is punched out in the middle of the No. 1 busbar, and a connecting piece is pressed into the middle of the No. 1 boss.

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