Assembling method for cylindrical battery, and cylindrical battery

Abstract

The present application relates to the technical field of energy batteries. Disclosed are an assembling method for a cylindrical battery, and a cylindrical battery. The assembling method comprises the following steps: mounting a positive terminal post in a mounting hole in an insulating and sealing manner; arranging a riveting block in a housing and connecting same to the periphery of a riveting rib of the positive terminal post; connecting a positive current-collecting disk to a positive tab of an electrode group; placing the electrode group with the positive current-collecting disk into the housing, and snap-fitting a boss into a groove; welding a bottom face of the groove and a top face of the boss outside the housing; connecting each of a negative current-collecting disk and a negative tab of the electrode group to the housing, so as to introduce a negative current of the electrode group into the housing; and connecting a negative cover plate to an opening in a second end face of the housing in a sealing manner. The matching between the top face of the boss and the bottom face of the groove increases the welding area, and reduces the thickness of the positive terminal post, thereby reducing the welding difficulty, increasing the assembling efficiency, reducing the internal resistance of contact, increasing the over-current capacity of the battery, and improving the product yield; and the riveting block can enhance the structural strength of a positive electrode side of a battery cell.

Description

Cylindrical battery assembly method and cylindrical battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 2023108076506, filed with the China Patent Office on July 3, 2023, entitled “Cylindrical Battery Assembly Method and Cylindrical Battery,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the technical field of cylindrical batteries, and in particular to a cylindrical battery assembly method and a cylindrical battery. Background Art

[0004] Cylindrical batteries, with their high energy density, safety, and low cost, have become a key research area for power batteries used in new energy vehicles. Cylindrical batteries primarily consist of a housing, a winding core, positive and negative cover plates, a positive electrode post, and positive and negative current collector plates. The housing is open at the first end, with a mounting hole defined on the second end. The winding core is positioned within the housing, with the negative cover plate sealing the first end. The positive electrode post is mounted within the mounting hole, and the positive current collector plate connects the winding core's positive tab to the positive electrode post.

[0005] In the prior art, the positive current collector and the positive electrode are usually connected by using a resistance welding needle to pass through the central through-hole of the winding core to weld the adapter plate and the electrode from the inside of the shell. Due to the limitation of the spatial range of the central through-hole of the winding core, the welding area is small and the welding difficulty is great. In addition, due to the influence of the thickness of the positive electrode column, the current contact internal resistance after welding is also large, which affects the battery's overcurrent capacity.

[0006] Application Contents

[0007] In view of this, the present application provides a cylindrical battery assembly method and a cylindrical battery to solve the problems of existing cylindrical batteries having a small welding area, high welding difficulty and large current contact internal resistance after welding, thereby affecting the battery's overcurrent capacity.

[0008] In a first aspect, the present application provides a method for assembling a cylindrical battery, the cylindrical battery comprising a housing, a positive electrode column, a rivet block, a positive electrode current collector, an electrode group, a negative electrode current collector, and a negative electrode cover. A mounting hole is provided on a first end surface of the housing, and a second end surface of the housing is open. A groove is provided on a side of the positive electrode column facing the interior of the housing, and a rivet rib is formed circumferentially of the groove. A boss is provided on a side of the positive electrode current collector facing the positive electrode column. The assembly method comprises the following steps:

[0009] Installing the positive electrode column in an insulating and sealing manner in the mounting hole;

[0010] The rivet block is arranged in the housing and connected to the outer periphery of the rivet rib of the positive electrode column;

[0011] Connecting the positive electrode current collecting disk to the positive electrode tab of the electrode group;

[0012] Placing the electrode group with the positive electrode current collecting disk in the housing, with the boss clamped in the groove;

[0013] The matching positions of the bottom surface of the groove and the top surface of the boss are welded outside the shell.

[0014] Beneficial effect: By insulating and sealing the positive electrode column in the mounting hole on the first end face of the shell, the mutually insulated and sealed fixed connection between the positive electrode column and the shell is achieved, and by clamping the boss of the positive current collecting disc into the groove of the positive electrode column, and welding the matching position of the top surface of the boss and the bottom surface of the groove, the welding fixation of the two is achieved. The matching of the top surface of the boss and the bottom surface of the groove increases the welding area, and the groove reduces the welding thickness of the positive electrode column, thereby reducing the welding difficulty, improving the assembly efficiency, and also reducing the contact internal resistance, increasing the battery's overcurrent capacity, and improving the product yield. At the same time, a rivet block is provided on the periphery of the rivet rib, and the rivet block can enhance the structural strength of the positive electrode side of the battery cell.

[0015] In an optional embodiment, the rivet block is arranged in the shell and connected to the outer periphery of the rivet rib of the positive electrode column, specifically including: sleeved on the outer periphery of the positive electrode column, so that the rivet rib passes through the through hole on the rivet block; and / or, the rivet rib is bent away from the outside of the groove, so that the rivet rib is embedded in the installation groove of the rivet block.

[0016] Beneficial effect: A mounting groove is set on the riveted block, and the riveted rib is bent away from the outside of the groove, so that the riveted rib is embedded in the mounting groove, ensuring the reliability of the cooperation between the riveted rib and the riveted block, and the riveted rib is fixed by the mounting groove to prevent it from detaching from the riveted block.

[0017] In an optional embodiment, the positive electrode column includes a limiting protrusion located outside the shell and the rivet rib located inside the shell, the limiting protrusion and the rivet rib respectively limit the two ends of the positive electrode column, and the insulating and sealing installation of the positive electrode column in the mounting hole specifically includes: setting a sealing member abutting between the outer wall of the positive electrode column and the inner wall of the mounting hole; setting an upper insulating member between the limiting protrusion and the outer surface of the shell; setting a lower insulating member on the inner surface of the shell, and the rivet block abuts against the lower insulating member.

[0018] Beneficial effects: The upper insulating part insulates the limiting protrusion and the outer surface of the shell, and the sealing part seals the outer wall of the positive pole and the inner wall of the mounting hole to ensure the sealing of the battery cell. The lower insulating part insulates the inner surface of the shell and the rivet block, thereby realizing the insulation sealing fixation between the positive pole and the shell. At the same time, the rivet block rests on the lower insulating part. When the welding boss and the groove are matched, the rivet rib and the rivet block act as force support, which will generate a large instantaneous impact on the lower insulating part. The setting of the rivet block increases the contact force area with the lower insulating part, thereby reducing the pressure on the lower insulating part and reducing the risk of its stress cracking.

[0019] In an optional embodiment, the upper insulating member is arranged between the limiting protrusion and the outer surface of the shell, specifically including: wrapping the first insulating portion of the upper insulating member around the outer periphery of the limiting protrusion; and arranging the second insulating portion of the upper insulating member between the bottom surface of the limiting protrusion and the outer surface of the shell.

[0020] Beneficial effect: The first insulating part is wrapped around the outer periphery of the limiting protrusion, which can protect the limiting protrusion and prevent the limiting protrusion from being damaged by collision. The second insulating part is arranged between the bottom surface of the limiting protrusion and the outer surface of the shell, thereby achieving insulation between the limiting protrusion and the shell.

[0021] In an optional embodiment, the sealing member is abutted between the outer wall of the positive electrode column and the inner wall of the mounting hole, specifically comprising: abutting the first sealing portion of the sealing member between the outer surface of the shell and the bottom surface of the limiting protrusion, and the end of the first sealing portion abuts against the second insulating portion; abutting the second sealing portion of the sealing member between the outer wall of the positive electrode column and the inner wall of the mounting hole, and the end of the second sealing portion abuts against the lower insulating member.

[0022] Beneficial effect: The first sealing portion is abutted between the outer surface of the shell and the bottom surface of the limiting protrusion, thereby sealing the outer surface of the shell and the bottom surface of the limiting protrusion; the second sealing portion is abutted between the outer wall of the positive electrode column and the inner wall of the mounting hole, thereby sealing the outer wall of the positive electrode column and the inner wall of the mounting hole; at the same time, the end of the first sealing portion abuts against the second insulating portion, and the end of the second sealing portion abuts against the lower insulating member, which can enhance the sealing performance.

[0023] In an optional embodiment, the boss is engaged in the groove, which specifically includes: chamfering the opening of the groove, and the boss is engaged in the groove through the chamfered corners.

[0024] Beneficial effect: By rounding the opening of the groove, the boss can be easily snapped into the groove through the rounded corners, reducing the difficulty of assembling the two and improving the assembly efficiency.

[0025] In an optional embodiment, the welding of the matching position of the bottom surface of the groove and the top surface of the boss outside the shell specifically includes: opening a welding groove on the top surface of the positive electrode column, the welding groove corresponding to the groove; and welding the matching position of the bottom surface of the groove and the top surface of the boss outside the shell through the welding groove.

[0026] Beneficial effect: The provision of the welding groove further reduces the welding thickness of the positive electrode column and reduces the welding difficulty. At the same time, the welding groove also avoids the weld marks formed by welding protruding from the surface of the positive electrode column and affecting its connection with the external structure.

[0027] In an optional embodiment, the cylindrical battery assembly method further includes: connecting the negative electrode current collecting plate and the negative electrode tab of the electrode group to the shell, so as to introduce the negative electrode current of the electrode group to the shell.

[0028] Beneficial effect: The negative electrode current collecting disk is connected to the negative electrode ear of the electrode group, which is used to collect the negative electrode current of the electrode group and then output the negative electrode current. Since the negative electrode current collecting disk is also connected to the shell, the negative electrode current collecting disk and the shell are negatively charged as a whole.

[0029] In an optional embodiment, the cylindrical battery assembly method further includes: sealingly connecting the negative electrode cover plate to the opening of the second end surface of the shell, thereby sealing the shell 1 and completing the assembly of the cylindrical battery.

[0030] In the second aspect, the present application also provides a cylindrical battery assembled using the cylindrical battery assembly method of the present application, comprising a shell, an electrode group, a positive electrode column, a rivet block, a positive electrode collector disk, a negative electrode collector disk and a negative electrode cover plate, wherein a mounting hole is provided on the first end face of the shell, and the second end face of the shell is open. The electrode group is arranged in the shell, and the positive electrode column is insulated and sealed and installed in the mounting hole. A groove is provided on the side of the positive electrode column facing the inside of the shell, and a rivet rib is formed circumferentially of the groove. The rivet block is arranged in the shell and connected to the outer periphery of the rivet rib. The positive electrode collector disk is connected to the positive electrode ear of the electrode group, and a boss is provided on the side of the positive electrode collector disk facing the positive electrode column, and the boss is clamped in the groove. The negative electrode collector disk is connected to the negative electrode ear of the electrode group and the shell, and the negative electrode cover plate is sealed at the opening of the second end face of the shell.

[0031] Since the cylindrical battery of the present application is assembled by adopting the above-mentioned cylindrical battery assembly method, it has the same technical effect as the cylindrical battery assembly method, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a flow chart showing the main steps of a cylindrical battery assembly method according to an embodiment of the present application;

[0034] FIG2 is a schematic diagram of the three-dimensional structure of a cylindrical battery according to an embodiment of the present application;

[0035] FIG3 is a top view of a cylindrical battery according to an embodiment of the present application;

[0036] FIG4 is a cross-sectional view taken along line AA in FIG3 ;

[0037] FIG5 is a partially enlarged cross-sectional view of a cylindrical battery according to an embodiment of the present application;

[0038] FIG6 is a cross-sectional view of a positive electrode column according to an embodiment of the present application;

[0039] FIG7 is a schematic diagram of the three-dimensional structure of the positive electrode column according to an embodiment of the present application;

[0040] FIG8 is a cross-sectional view of a positive electrode current collecting disk according to an embodiment of the present application;

[0041] FIG9 is a schematic diagram of the three-dimensional structure of the positive electrode current collecting disk according to an embodiment of the present application.

[0042] 1. Shell; 2. Positive pole; 21. Groove; 211. Chamfered corner; 22. Riveted rib; 23. Limiting protrusion; 24. Welding groove; 3. Riveted block; 31. Mounting groove; 4. Positive current collecting plate; 41. Boss; 5. Pole group; 6. Upper insulator; 61. First insulating part; 62. Second insulating part; 7. Seal; 71. First sealing part; 72. Second sealing part; 8. Lower insulator; 9. Negative current collecting plate; 10. Negative cover plate. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0044] As shown in Figures 1 to 5, according to an embodiment of the present application, on the one hand, a cylindrical battery assembly method is provided, which includes a shell 1, a positive electrode column 2, a rivet block 3, a positive electrode collector plate 4, an electrode group 5, a negative electrode collector plate 9 and a negative electrode cover plate 10, wherein a mounting hole is provided on the first end face of the shell 1, and the second end face of the shell 1 is open. A groove 21 is provided on the side of the positive electrode column 2 facing the inside of the shell 1, and a rivet rib 22 is formed circumferentially of the groove 21. A boss 41 is provided on the side of the positive electrode collector plate 4 facing the positive electrode column 2.

[0045] The assembly method includes the following steps: insulating and sealing the positive electrode column 2 in the mounting hole; arranging the rivet block 3 in the shell 1 and connecting it to the outer periphery of the rivet rib 22 of the positive electrode column 2; connecting the positive electrode current collecting disc 4 to the positive electrode ear of the electrode group 5; placing the electrode group 5 with the positive electrode current collecting disc 4 in the shell 1, and clamping the boss 41 in the groove 21; and welding the matching portion between the groove 21 and the boss 41.

[0046] The assembly method of this embodiment realizes the mutually insulated and sealed fixed connection between the positive electrode column 2 and the shell 1 by insulated and sealed installation of the positive electrode column 2 in the installation hole on the first end face of the shell 1, and realizes the welding fixation of the two by clamping the boss 41 of the positive current collecting disk 4 into the groove 21 of the positive electrode column 2, and welding the matching position of the top surface of the boss 41 and the bottom surface of the groove 21. The matching of the top surface of the boss 41 and the bottom surface of the groove 21 increases the welding area, and the groove 21 reduces the welding thickness of the positive electrode column 2, thereby reducing the welding difficulty, improving the assembly efficiency, reducing the contact internal resistance, increasing the current capacity of the battery, and improving the product yield. At the same time, a rivet block 3 is provided on the periphery of the rivet rib 22, and the rivet block 3 can enhance the structural strength of the positive electrode side of the battery cell.

[0047] The cylindrical battery assembly method is described in detail below with reference to the accompanying drawings.

[0048] As shown in Figures 4 to 6, the rivet block 3 is disposed within the housing 1 and connected to the outer periphery of the rivet rib 22 of the positive electrode post 2. Specifically, the rivet block 3 is sleeved around the outer periphery of the positive electrode post 2, with the rivet rib 22 passing through a through-hole on the rivet block 3; and / or the rivet rib 22 is bent away from the outside of the groove 21, so that the rivet rib 22 is embedded in the mounting groove 31 of the rivet block 3. This arrangement, by providing the mounting groove 31 on the rivet block 3 and then bending the rivet rib 22 away from the outside of the groove 21, so that the rivet rib 22 is embedded in the mounting groove 31, ensures the reliable fit between the rivet rib 22 and the rivet block 3, and allows the rivet rib 22 to be fixed in place by the mounting groove 31, preventing it from separating from the rivet block 3.

[0049] In this embodiment, the rivet rib 22 is an annular rib arranged along the circumference of the groove 21, and the rivet block 3 is also an annular block with a through hole in the middle. The installation groove 31 is opened on the inner wall of the through hole. During installation, the rivet block 3 is first sleeved on the outer periphery of the groove 21 through the through hole, and the rivet rib 22 around the groove 21 is bent toward the outside of the groove 21 to form an annular rib. The annular rib is stuck in the installation groove 31 to achieve the coordinated installation of the rivet block 3 and the rivet rib 22.

[0050] The positive electrode post 2 includes a limiting protrusion 23 located on the outside of the housing 1 and a rivet rib 22 located on the inside of the housing 1. The limiting protrusion 23 and the rivet rib 22 respectively limit the ends of the positive electrode post 2 to prevent the positive electrode post 2 from falling out of the mounting hole of the housing 1. Specifically, the mounting hole is a circular hole, and the positive electrode post 2 is also a circular cylinder. The limiting protrusion 23, the groove 21, and the rivet rib 22 can be formed by stamping or extrusion after the positive electrode post 2 is inserted into the mounting hole, and this embodiment does not impose specific limitations.

[0051] In this embodiment, the positive electrode column 2 is insulated and sealed and installed in the mounting hole, specifically including: setting the sealing member 7 in contact between the outer wall of the positive electrode column 2 and the inner wall of the mounting hole, setting the upper insulating member 6 between the limiting protrusion 23 and the outer surface of the shell 1, setting the lower insulating member 8 on the inner surface of the shell 1, and the rivet block 3 abutting against the lower insulating member 8. This arrangement ensures the sealing of the battery cell by insulating the limiting protrusion 23 and the outer surface of the shell 1 through the upper insulating part 6, and sealing the outer wall of the positive pole 2 and the inner wall of the mounting hole through the sealing part 7, and insulates the inner surface of the shell 1 and the rivet block 3 through the lower insulating part 8, thereby achieving insulating and sealing fixation between the positive pole 2 and the shell 1. At the same time, the rivet block 3 rests on the lower insulating part 8. When the welding boss 41 and the groove 21 are engaged, the rivet rib 22 and the rivet block 3 act as force support, which will generate a large instantaneous impact on the lower insulating part 8. The arrangement of the rivet block 3 increases the contact force area with the lower insulating part 8, thereby reducing the pressure on the lower insulating part 8 and reducing the risk of its stress cracking.

[0052] In this embodiment, the shell 1 is a hollow cylindrical shell with one end closed and the other end open. The mounting hole is set on the closed end face, the positive electrode column 2 is insulated and sealed in the mounting hole, and the negative electrode cover plate 10 is sealed at the open end, thereby achieving a sealed assembly of the shell 1.

[0053] In this embodiment, the upper insulating member 6 is disposed between the limiting protrusion 23 and the outer surface of the housing 1. Specifically, the first insulating portion 61 of the upper insulating member 6 is wrapped around the outer periphery of the limiting protrusion 23, and the second insulating portion 62 of the upper insulating member 6 is disposed between the bottom surface of the limiting protrusion 23 and the outer surface of the housing 1. In this arrangement, the upper insulating member 6 includes the first insulating portion 61 and the second insulating portion 62. The first insulating portion 61 wraps around the outer periphery of the limiting protrusion 23, protecting the limiting protrusion 23 from collision damage. The second insulating portion 62 is disposed between the bottom surface of the limiting protrusion 23 and the outer surface of the housing 1, thereby achieving insulation between the limiting protrusion 23 and the housing 1.

[0054] Specifically, the upper insulating member 6 is a U-shaped member with an avoidance hole in the middle to facilitate the passage of the positive electrode column 2. The vertical part of the U-shaped member is the first insulating part 61, which is wrapped around the outer periphery of the limiting protrusion 23. The horizontal part of the U-shaped member is the second insulating part 62, which is arranged between the bottom surface of the limiting protrusion 23 and the outer surface of the shell 1.

[0055] In this embodiment, the seal 7 is abutted and set between the outer wall of the positive electrode column 2 and the inner wall of the mounting hole, specifically including: the first sealing portion 71 of the seal 7 is abutted and set between the outer surface of the shell 1 and the bottom surface of the limiting protrusion 23, and the end of the first sealing portion 71 abuts against the second insulating portion 62, and the second sealing portion 72 of the seal 7 is abutted and set between the outer wall of the positive electrode column 2 and the inner wall of the mounting hole, and the end of the second sealing portion 72 abuts against the lower insulating member 8. In this arrangement, the sealing member 7 includes a first sealing portion 71 and a second sealing portion 72. The first sealing portion 71 is abutted between the outer surface of the shell 1 and the bottom surface of the limiting protrusion 23, thereby sealing the outer surface of the shell 1 and the bottom surface of the limiting protrusion 23. The second sealing portion 72 is abutted between the outer wall of the positive electrode column 2 and the inner wall of the mounting hole, thereby sealing the outer wall of the positive electrode column 2 and the inner wall of the mounting hole. At the same time, the end of the first sealing portion 71 abuts against the second insulating portion 62, and the end of the second sealing portion 72 abuts against the lower insulating member 8, which can enhance the sealing performance.

[0056] Specifically, the sealing member 7 is a T-shaped sealing ring, the horizontal part of the T-shaped sealing ring is the first sealing portion 71, which is arranged between the outer surface of the shell 1 and the bottom surface of the limiting protrusion 23, and the end of the first sealing portion 71 is against the second insulating portion 62, and the vertical part of the T-shaped sealing ring is the second sealing portion 72, which is arranged between the outer wall of the positive electrode column 2 and the inner wall of the mounting hole, and the end of the second sealing portion 72 is against the lower insulating member 8.

[0057] The positive current collector plate 4 is connected to the positive tab of the electrode group 5 to enable the positive current of the electrode group 5 to be collected and extracted through the positive current collector plate 4. Specifically, the electrode group 5 is used to store and release electricity. In this embodiment, the electrode group 5 is a wound cylindrical battery cell with a size smaller than the inner cavity size of the housing 1 to facilitate its placement within the housing 1. The electrode group 5 is provided with positive and negative tabs to facilitate the extraction of positive and negative currents.

[0058] Furthermore, the boss 41 is snapped into the groove 21, specifically comprising: rounding the opening of the groove 21 with a rounded corner 211, and the boss 41 is snapped into the groove 21 through the rounded corner 211. By rounding the opening of the groove 21 with a rounded corner 211, the boss 41 can be easily snapped into the groove 21 through the rounded corner 211, reducing the difficulty of assembly between the two and improving assembly efficiency.

[0059] As shown in Figures 4 to 9, in this embodiment, the positive electrode current collecting disc 4 is welded to the positive electrode ear of the electrode group 5 to collect the positive current of the electrode group 5 and then output the positive current. Specifically, the shape of the positive electrode current collecting disc 4 is adapted to the shape of the electrode group 5 and can be set as a circular disc. A boss 41 is provided in the middle of the circular disc. The boss 41 can cooperate with the groove 21 on the positive electrode column 2. In this embodiment, the groove 21 is a cylindrical groove 21, and the boss 41 is a hollow circular platform. Specifically, it can be formed by stamping or extruding the middle part of the positive electrode current collecting disc 4. The size of the circular platform is smaller than the inner diameter of the groove 21, so that the boss 41 can be snapped into the groove 21.

[0060] Welding is performed on the outside of the housing 1 at the mating point between the bottom surface of the groove 21 and the top surface of the boss 41. Specifically, the process includes providing a welding groove 24 on the top surface of the positive electrode column 2. The welding groove 24 corresponds to the groove 21, and the welding is performed at the mating point between the bottom surface of the groove 21 and the top surface of the boss 41 through the welding groove 24. This configuration further reduces the weld thickness of the positive electrode column 2, thereby reducing the welding difficulty. Furthermore, the welding groove 24 prevents weld marks from protruding from the surface of the positive electrode column 2 and affecting its connection to the external structure.

[0061] Specifically, welding groove 24 is a circular groove whose size matches that of recess 21, allowing for complete welding of the bottom surface of recess 21 to the top surface of boss 41, enhancing weld strength. Both welding groove 24 and recess 21 are blind grooves, with a weld rib formed between them. This rib is then welded to boss 41, which is secured within recess 21.

[0062] In this embodiment, the cylindrical battery assembly method further includes: connecting the negative electrode current collecting plate 9 and the negative electrode tab of the electrode group 5 to the housing 1 to introduce the negative electrode current of the electrode group 5 to the housing 1.

[0063] Specifically, the negative electrode current collecting plate 9 is welded to the negative electrode ear of the electrode group 5 to collect the negative current of the electrode group 5 and then output the negative current. In this embodiment, since the negative electrode current collecting plate 9 is welded to the shell 1, the negative electrode current collecting plate 9 and the shell 1 are negatively charged as a whole.

[0064] Furthermore, the method further includes: sealingly connecting the negative electrode cover plate 10 to the opening of the second end surface of the shell 1.

[0065] Specifically, the negative electrode cover 10 is welded to the open portion of the shell 1 , thereby sealing the shell 1 and completing the assembly of the cylindrical battery.

[0066] As for the welding method, the bottom surface of the groove 21 and the top surface of the boss 41, the positive electrode current collecting plate 4 and the positive electrode ear of the electrode group 5, the negative electrode current collecting plate 9 and the negative electrode ear of the electrode group 5, and the negative electrode cover plate 10 and the shell 1 can all be connected by a penetration welding process.

[0067] This embodiment also discloses a cylindrical battery assembled using the cylindrical battery assembly method of this embodiment, comprising a shell 1, an electrode group 5, a positive electrode column 2, a rivet block 3, a positive electrode collector disc 4, a negative electrode collector disc 9 and a negative electrode cover plate 10, wherein a mounting hole is provided on the first end surface of the shell 1, and the second end surface of the shell 1 is open. The electrode group 5 is arranged in the shell 1, and the positive electrode column 2 is insulated and sealed and installed in the mounting hole. A groove 21 is provided on the side of the positive electrode column 2 facing the inside of the shell 1, and a rivet rib 22 is formed around the circumference of the groove 21. The rivet block 3 is arranged in the shell 1 and connected to the outer periphery of the rivet rib 22. The positive electrode collector disc 4 is connected to the positive electrode ear of the electrode group 5, and a boss 41 is provided on the side of the positive electrode collector disc 4 facing the positive electrode column 2, and the boss 41 is clamped in the groove 21. The negative electrode collector disc 9 is connected to the negative electrode ear of the electrode group 5 and the shell 1, and the negative electrode cover plate 10 is sealed and arranged at the open part of the second end surface of the shell 1. The cylindrical battery of this embodiment is assembled using the above-mentioned cylindrical battery assembly method, and therefore has the same technical effects as the cylindrical battery assembly method, which will not be described in detail here.

[0068] A mounting groove 31 is provided on one side of the riveted block 3 facing the positive electrode current collecting plate 4 , and the riveted rib 22 passes through the through hole of the riveted block 3 and is bent and arranged in the mounting groove 31 , thereby achieving the coordinated installation of the riveted rib 22 and the riveted block 3 .

[0069] The cylindrical battery also includes an insulating sealing assembly, which includes a seal 7, an upper insulating member 6 and a lower insulating member 8, wherein the seal 7 is abutted between the outer wall of the positive electrode column 2 and the inner wall of the mounting hole, the upper insulating member 6 is arranged between the limiting protrusion 23 and the outer surface of the shell 1, and the lower insulating member 8 is arranged on the inner surface of the shell 1, and the rivet block 3 abuts against the lower insulating member 8. The upper insulating member 6 is used to insulate the limiting protrusion 23 from the outer surface of the shell 1, and the sealing member 7 is used to seal the outer wall of the positive electrode column 2 and the inner wall of the mounting hole to ensure the sealing of the battery cell. The lower insulating member 8 is used to insulate the inner surface of the shell 1 and the rivet block 3, thereby realizing the insulation sealing fixation between the positive electrode column 2 and the shell 1. At the same time, the rivet block 3 rests on the lower insulating member 8. When the welding boss 41 and the groove 21 are engaged, the rivet rib 22 and the rivet block 3 act as force support, which will generate a large instantaneous impact on the lower insulating member 8. The setting of the rivet block 3 increases the contact force area with the lower insulating member 8, thereby reducing the pressure on the lower insulating member 8 and reducing the risk of its stress cracking.

[0070] The top surface of the positive electrode column 2 is provided with a welding groove 24, which corresponds to the groove 21. The welding groove 24 is suitable for welding the mating portion between the boss 41 and the groove 21. The provision of the welding groove 24 further reduces the weld thickness of the positive electrode column 2, reducing the welding difficulty. At the same time, the welding groove 24 also prevents the weld marks formed by the welding from protruding from the surface of the positive electrode column 2 and affecting its connection with the external structure.

[0071] It should be noted that since the relevant structures of the cylindrical battery of this embodiment have been introduced in detail in the assembly method above, the various structures will not be described in detail here. For details, please refer to the above introduction to the shell 1, electrode group 5, positive electrode column 2, rivet block 3, positive electrode current collecting plate 4, negative electrode current collecting plate 9 and negative electrode cover plate 10.

[0072] In summary, the cylindrical battery assembly method and cylindrical battery of this embodiment have the following advantages: the matching form of the positive electrode column 2 and the positive electrode current collecting plate 4 improves the assembly efficiency and performance, increases the battery flow area, improves the product yield, and reduces the product cost.

[0073] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims. Industrial Applicability

[0074] The cylindrical battery assembly method and cylindrical battery provided in the present application achieve a mutually insulated and sealed fixed connection between the positive electrode column and the shell by insulated and sealed installation of the positive electrode column in the installation hole on the first end face of the shell, and achieve welding and fixation of the two by clamping the boss of the positive current collector into the groove of the positive electrode column and welding the matching position of the top surface of the boss and the bottom surface of the groove. The matching of the top surface of the boss and the bottom surface of the groove increases the welding area, and the groove reduces the welding thickness of the positive electrode column, thereby reducing the welding difficulty, improving the assembly efficiency, reducing the contact internal resistance, increasing the current flow capacity of the battery, and improving the product yield. At the same time, a rivet block is provided on the outer periphery of the rivet rib, and the rivet block can enhance the structural strength of the positive electrode side of the battery cell.

Claims

1. A cylindrical battery assembly method, characterized in that: The cylindrical battery comprises a shell, a positive electrode column, a riveting block, a positive electrode collector, an electrode group, a negative electrode collector and a negative electrode cover plate, a first end surface of the shell is provided with a mounting hole, a second end surface of the shell is open, a groove is provided on the side of the positive electrode column facing the inside of the shell, a riveting rib is formed in the circumference of the groove, a boss is provided on the side of the positive electrode collector facing the positive electrode column, and the assembly method comprises the following steps: Installing the positive electrode column in an insulating and sealing manner in the installation hole; The rivet block is arranged in the housing and connected to the outer periphery of the rivet rib of the positive electrode column; Connecting the positive electrode current collector to the positive electrode ear of the electrode group; The electrode group with the positive electrode current collector is placed in the housing, and the boss is clamped in the groove; The matching positions of the groove bottom surface of the groove and the top surface of the boss are welded outside the shell.

2. The cylindrical battery assembly method according to claim 1, characterized in that: The method of arranging the riveting block in the housing and connecting it to the outer periphery of the riveting rib of the positive electrode column specifically includes: The riveting block is sleeved on the outer periphery of the positive electrode column, and the riveting rib passes through the through hole on the riveting block; And / or, the rivet rib is bent away from the outside of the groove so that the rivet rib is embedded in the installation groove of the rivet block.

3. The cylindrical battery assembly method according to claim 2, characterized in that: The positive electrode column comprises a limiting protrusion located outside the shell and the riveting rib located inside the shell, the limiting protrusion and the riveting rib respectively limit the two ends of the positive electrode column, and the insulating and sealing installation of the positive electrode column in the installation hole specifically includes: The sealing member is disposed between the outer wall of the positive electrode column and the inner wall of the mounting hole; Disposing an upper insulating member between the limiting protrusion and the outer surface of the shell; A lower insulating piece is arranged on the inner surface of the housing, and the riveting block abuts against the lower insulating piece.

4. The cylindrical battery assembly method according to claim 3, characterized in that: The method of arranging the upper insulating member between the limiting protrusion and the outer surface of the shell specifically includes: Covering the first insulating portion of the upper insulating member on the outer periphery of the limiting protrusion; The second insulating portion of the upper insulating member is disposed between the bottom surface of the limiting protrusion and the outer surface of the shell.

5. The cylindrical battery assembly method according to claim 4, characterized in that: The step of abutting and arranging the sealing member between the outer wall of the positive electrode column and the inner wall of the mounting hole specifically includes: The first sealing portion of the sealing member is disposed between the outer surface of the housing and the bottom surface of the limiting protrusion, and the end of the first sealing portion is in contact with the second insulating portion; The second sealing portion of the sealing member is disposed between the outer wall of the positive electrode column and the inner wall of the mounting hole, and an end of the second sealing portion abuts against the lower insulating member.

6. The cylindrical battery assembly method according to any one of claims 1 to 5, characterized in that: The boss is clamped in the groove, which specifically includes: rounding the opening of the groove, and the boss is clamped in the groove through the rounded corners.

7. The cylindrical battery assembly method according to any one of claims 1 to 5, characterized in that: The welding of the matching position of the groove bottom surface of the groove and the top surface of the boss outside the shell specifically includes: A welding groove is provided on the top surface of the positive electrode column, wherein the welding groove corresponds to the groove; The matching positions of the groove bottom surface of the groove and the top surface of the boss are welded outside the shell through the welding groove.

8. The cylindrical battery assembly method according to any one of claims 1 to 5, characterized in that: Also includes: The negative electrode current collecting plate and the negative electrode ear of the electrode group are connected to the shell to introduce the negative electrode current of the electrode group into the shell.

9. The cylindrical battery assembly method according to claim 8, characterized in that: Also includes: The negative electrode cover plate is sealed and connected to the open portion of the second end surface of the shell.

10. A cylindrical battery assembled by the cylindrical battery assembly method according to any one of claims 1 to 9, characterized in that: include: A housing, wherein a mounting hole is provided on a first end surface of the housing, and a second end surface of the housing is open; A pole group is arranged in the shell; A positive pole, insulated and sealed, is installed in the installation hole, a groove is provided on one side of the positive pole facing the inside of the shell, and a riveting rib is formed in the circumference of the groove; A riveting block, disposed in the housing and connected to the outer periphery of the riveting rib; A positive electrode current collector disk connected to the positive electrode ear of the electrode group, wherein a boss is provided on a side of the positive electrode current collector disk facing the positive electrode column, and the boss is clamped in the groove; A negative electrode current collector, connected to the negative electrode ear of the electrode group and the shell; The negative electrode cover plate is sealed and arranged at the opening of the second end surface of the shell.

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