Bottom welding structure of cylindrical lithium battery

Abstract

The utility model belongs to the technical field of lithium battery bottom welding. The bottom welding structure of the cylindrical lithium battery comprises a base, a grounding plate is fixedly arranged at the top of the base, a limiting sleeve is fixedly arranged at the top of the grounding plate, a limiting barrel is fixedly arranged on the inner wall of the limiting sleeve, a limiting groove is formed in the top of the limiting barrel, and abutting blocks are slidably connected to the inner wall of the limiting groove in an annular structure at equal intervals in a penetrating mode. Two sliding rods are slidably connected to the outer sides of the multiple abutting blocks in a penetrating mode in a vertically symmetrical structure mode, the outer walls of the circumferences of the two sliding rods are sleeved with springs, connecting plates are arranged on the outer sides of the multiple abutting blocks, the multiple connecting plates are slidably connected with the limiting barrel and the limiting sleeve correspondingly, and the connecting plates are fixedly connected with the two sliding rods correspondingly. And a plurality of adjusting hand wheels are rotated, so that a plurality of connecting plates can be pushed to slide towards the interior of a limiting barrel, and the distances among a plurality of abutting blocks can be adjusted, so that the steel shells with different sizes can be clamped.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery bottom welding, in particular to a bottom welding structure of a cylindrical lithium battery. Background Art

[0002] In the production of cylindrical lithium batteries, the quality of the spot welding at the bottom of the cylindrical lithium battery has an important impact on the quality of the battery, affecting the safety of the cylindrical lithium battery and the product qualification rate. When performing bottom welding on cylindrical lithium batteries, a very fine spot welding needle is used to pass through the gap in the middle of the coil and press on the connecting piece, and the other end electrode is pressed on the battery shell to form a current path for resistance welding.

[0003] In the existing technology, such as the document with publication number CN218975737U, a bottom welding structure of a cylindrical lithium battery is specifically disclosed. In this document, a device squeezes and fixes the outer wall of the steel shell through a limit block elastically connected to a second spring. Although this structural design can clamp and position steel shells of different sizes, due to the different diameters of the steel shell, when the diameter of the steel shell is small, the second spring can be fully extended. At this time, the elastic squeezing force of the second spring is relatively small. Even if the limit block can squeeze the outer wall of the steel shell, the stability of the steel shell clamping is relatively small, which is not conducive to bottom welding processing. For this reason, we propose a bottom welding structure of a cylindrical lithium battery. Utility Model Content

[0004] Based on the above-mentioned technical problem that "the device in the prior art squeezes and fixes the outer wall of the steel shell through a limit block elastically connected by a second spring. Although this structural design can clamp and position steel shells of different sizes, due to the different diameters of the steel shells, when the diameter of the steel shell is small, the second spring can be fully extended. At this time, the elastic squeezing force of the second spring is relatively small. Even if the limit block can squeeze the outer wall of the steel shell, the stability of the steel shell clamping is relatively small, which is not conducive to bottom welding processing", the utility model proposes a bottom welding structure for a cylindrical lithium battery.

[0005] The utility model proposes a bottom welding structure of a cylindrical lithium battery, including a base, a grounding plate fixedly provided on the top of the base, a limiting sleeve fixedly provided on the top of the grounding plate, a limiting cylinder fixedly provided on the inner wall of the limiting sleeve, a limiting groove arranged on the top of the limiting cylinder, the inner wall of the limiting groove presents a ring-shaped structure with equal spacing, and is slidably connected with a stop block, and the outer sides of the multiple stop blocks present a vertically symmetrical structure, and are slidably connected with two sliding rods, the circumferential outer walls of the two sliding rods are sleeved with springs, the outer sides of the multiple stop blocks are provided with connecting plates, the multiple connecting plates are slidably connected with the limiting cylinder and the limiting sleeve respectively, the connecting plates are respectively connected and fixed to the two sliding rods, the four sides of the outer wall of the limiting sleeve are threadedly connected with adjusting hand wheels, the inner ends of the multiple adjusting hand wheels extend into the interior of the limiting sleeve, and the inner ends of the multiple adjusting hand wheels are rotatably connected with the connecting plates respectively.

[0006] Preferably, one end of the spring is connected and fixed to the stop block, and the other end of the spring is connected and fixed to the connecting plate.

[0007] Preferably, the inner wall of the limiting cylinder is annularly symmetrical and has a plurality of mounting holes, the plurality of stop blocks are located in the mounting holes and are slidably connected to the inner walls thereof, and the plurality of connecting plates are slidably connected to the inner walls of the mounting holes respectively.

[0008] Preferably, the inner wall of the limiting sleeve is in an annular structure with equal spacing and is provided with a plurality of mounting grooves, and the plurality of connecting plates are respectively located in the mounting grooves and are slidably connected to the inner wall thereof.

[0009] Preferably, the outer wall of the stop block is provided with two sliding holes, and the two ends of the sliding rods both pass through the sliding holes and are slidably connected with the inner walls thereof.

[0010] Preferably, an inclined surface and an extrusion surface are provided on the inner side of the stop block, and the extrusion surface is arranged below the inclined surface.

[0011] Preferably, a support plate is fixedly provided on the top of the base, a welding machine is fixedly provided on the outer wall of the support plate, a top plate is fixedly provided on the top of the support plate, a shield and a cylinder are respectively fixedly provided on the top plate, the cylinder is arranged inside the shield, the bottom of the cylinder passes through the top plate and extends to below it, a connecting piece is fixedly provided on the bottom of the cylinder, the connecting piece is slidingly connected to the inner wall of the support plate, a welding block is fixedly provided on the bottom of the connecting piece, the welding block is electrically connected to the welding machine, the welding machine is electrically connected to the grounding plate, a conductive disk is fixedly provided on the inner wall of the limiting cylinder, and the lower end of the conductive disk is electrically connected to the grounding plate.

[0012] The beneficial effects of the present invention are:

[0013] 1. Turn multiple adjustment hand wheels to push multiple connecting plates to slide into the limiting cylinder respectively, so as to adjust the distance between multiple blocks to meet the clamping requirements of steel shells of different sizes;

[0014] 2. By setting the inclined surface, the steel shell squeezes the multiple blocks, so that the steel shell slides downward along the inclined surfaces on the inner sides of the multiple blocks, which can reduce the friction between the blocks and the steel shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the limit sleeve of the utility model;

[0018] Figure 3 This is a schematic diagram of the installation structure of the limit cylinder of the utility model;

[0019] Figure 4 The utility model is a schematic diagram of the installation structure of the resistance block.

[0020] In the figure: 1. base; 2. grounding plate; 3. support plate; 4. welding machine; 5. top plate; 6. shield; 7. cylinder; 8. connector; 9. welding block; 10. limiting sleeve; 11. limiting cylinder; 12. limiting groove; 13. mounting hole; 14. mounting groove; 15. connecting plate; 16. adjusting hand wheel; 17. sliding rod; 18. spring; 19. stop block; 20. inclined surface; 21. extrusion surface; 22. sliding hole; 23. conductive disk. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1 , Figure 2 and Figure 4As shown, a bottom welding structure of a cylindrical lithium battery includes a base 1, a grounding plate 2 is fixedly arranged on the top of the base 1, a limiting sleeve 10 is fixedly arranged on the top of the grounding plate 2, a limiting cylinder 11 is fixedly arranged on the inner wall of the limiting sleeve 10, a limiting groove 12 is arranged on the top of the limiting groove 11, the inner wall of the limiting groove 12 is an annular structure with equal spacing, and a through-type sliding connection is provided with a stopper 19, and the outer side of the plurality of stoppers 19 is a vertically symmetrical structure, and the through-type sliding connection has two slide bars 17, and the outer walls of the two slide bars 17 are sleeved with springs 18, and the outer sides of the plurality of stoppers 19 are provided with connecting plates 15, and the plurality of connecting plates 15 are respectively connected to the limiting cylinder 11 and the limiting sleeve 1 0 sliding connection, the connecting plate 15 is respectively connected and fixed with the two sliding rods 17, the four sides of the outer wall of the limiting sleeve 10 are threadedly connected with adjusting hand wheels 16, the inner ends of the multiple adjusting hand wheels 16 extend into the inside of the limiting sleeve 10, the inner ends of the multiple adjusting hand wheels 16 are respectively rotatably connected with the connecting plate 15, one end of the spring 18 is connected and fixed with the stop block 19, and the other end of the spring 18 is connected and fixed with the connecting plate 15, and the multiple adjusting hand wheels 16 are rotated, so that the multiple connecting plates 15 can be pushed to slide into the inside of the limiting cylinder 11 respectively, so that the distance between the multiple stop blocks 19 can be adjusted to meet the clamping use of steel shells of different sizes.

[0023] like Figure 2 and Figure 3 As shown, the inner wall of the limit cylinder 11 is an annular symmetrical structure with multiple mounting holes 13, multiple blocks 19 are located in the mounting holes 13 and are slidably connected to the inner walls thereof, multiple connecting plates 15 are respectively slidably connected to the inner walls of the mounting holes 13, the inner wall of the limit sleeve 10 is an annular equidistant structure with multiple mounting grooves 14, multiple connecting plates 15 are respectively located in the mounting grooves 14 and are slidably connected to the inner walls thereof, the outer wall of the block 19 is provided with two sliding holes 22, the ends of the two sliding rods 17 pass through the sliding holes 22 and are slidably connected to the inner walls thereof, the inner side of the block 19 is provided with an inclined surface 20 and an extrusion surface 21, and the extrusion surface 21 is arranged below the inclined surface 20.

[0024] like Figure 1 As shown, a support plate 3 is fixedly arranged on the top of the base 1, a welding machine 4 is fixedly arranged on the outer wall of the support plate 3, a top plate 5 is fixedly arranged on the top of the support plate 3, a shield 6 and a cylinder 7 are respectively fixedly arranged on the top plate 5, the cylinder 7 is arranged inside the shield 6, the bottom of the cylinder 7 passes through the top plate 5 and extends to below it, a connecting member 8 is fixedly arranged on the bottom of the cylinder 7, the connecting member 8 is slidingly connected to the inner wall of the support plate 3, a welding block 9 is fixedly arranged on the bottom of the connecting member 8, the welding block 9 is electrically connected to the welding machine 4, the welding machine 4 is electrically connected to the grounding plate 2, a conductive disk 23 is fixedly arranged on the inner wall of the limiting cylinder 11, and the lower end of the conductive disk 23 is electrically connected to the grounding plate 2.

[0025] Working principle: by installing the steel shell inside the limiting cylinder 11, the steel shell is used to squeeze multiple blocks 19, so that the steel shell slides downward along the inclined surfaces 20 inside the multiple blocks 19. At this time, under the elastic force of multiple springs 18, the extrusion surfaces 21 inside the multiple blocks 19 can clamp and fix the outer wall of the steel shell. By rotating multiple adjustment hand wheels 16, the multiple connecting plates 15 can be pushed to slide inside the limiting cylinder 11 respectively, so that the distance between the multiple blocks 19 can be adjusted to meet the needs of clamping steel shells of different sizes. The spot welding needle is inserted into the winding core inside the steel shell, and the external power supply of the welding machine 4 and the cylinder 7 is turned on. The cylinder 7 pushes the connecting piece 8 to move downward, and the welding block 9 is driven to move downward through the connecting piece 8 until it contacts the spot welding needle. When the welding block 9 contacts the spot welding needle, it stops, and the spot welding needle completely welds the winding core and the steel shell.

[0026] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bottom welding structure of a cylindrical lithium battery, comprising a base (1), characterized in that: A grounding plate (2) is fixedly provided on the top of the base (1), a limiting sleeve (10) is fixedly provided on the top of the grounding plate (2), a limiting cylinder (11) is fixedly provided on the inner wall of the limiting sleeve (10), a limiting groove (12) is provided on the top of the limiting cylinder (11), the inner wall of the limiting groove (12) is an annular structure with equal spacing, and is slidably connected to a stopper (19), and the outer sides of the plurality of stoppers (19) are symmetrical in structure and are slidably connected to two slide bars (17), and the outer walls of the two slide bars (17) are sleeved with a A spring (18), a plurality of the stop blocks (19) are provided with a connecting plate (15) on the outer side, the plurality of the connecting plates (15) are respectively slidably connected to the limiting cylinder (11) and the limiting sleeve (10), the connecting plates (15) are respectively connected and fixed to two sliding rods (17), the four sides of the outer wall of the limiting sleeve (10) are threadedly connected with an adjusting hand wheel (16), the inner ends of the plurality of the adjusting hand wheels (16) extend into the interior of the limiting sleeve (10), and the inner ends of the plurality of the adjusting hand wheels (16) are respectively rotatably connected to the connecting plates (15).

2. The bottom welding structure of a cylindrical lithium battery according to claim 1, characterized in that: One end of the spring (18) is connected and fixed to the stop block (19), and the other end of the spring (18) is connected and fixed to the connecting plate (15).

3. The bottom welding structure of a cylindrical lithium battery according to claim 1, characterized in that: The inner wall of the limiting cylinder (11) is annularly symmetrical and is provided with a plurality of mounting holes (13); the plurality of stop blocks (19) are located in the mounting holes (13) and are slidably connected to the inner walls thereof; and the plurality of connecting plates (15) are slidably connected to the inner walls of the mounting holes (13) respectively.

4. The bottom welding structure of a cylindrical lithium battery according to claim 1, characterized in that: The inner wall of the limiting sleeve (10) is in an annular structure with equal spacing and is provided with a plurality of mounting grooves (14), and the plurality of connecting plates (15) are respectively located in the mounting grooves (14) and are slidably connected to the inner wall thereof.

5. The bottom welding structure of a cylindrical lithium battery according to claim 1, characterized in that: The outer wall of the stop block (19) is provided with two sliding holes (22), and the ends of the two sliding rods (17) both pass through the sliding holes (22) and are slidably connected to the inner walls thereof.

6. The bottom welding structure of a cylindrical lithium battery according to claim 1, characterized in that: The inner side of the stopper (19) is provided with an inclined surface (20) and an extrusion surface (21), and the extrusion surface (21) is arranged below the inclined surface (20).

7. The bottom welding structure of a cylindrical lithium battery according to claim 1, characterized in that: A support plate (3) is fixedly provided on the top of the base (1), a welding machine (4) is fixedly provided on the outer wall of the support plate (3), a top plate (5) is fixedly provided on the top of the support plate (3), a shield (6) and a cylinder (7) are respectively fixedly provided on the top plate (5), the cylinder (7) is arranged inside the shield (6), the bottom of the cylinder (7) passes through the top plate (5) and extends below it, a connecting piece (8) is fixedly provided on the bottom of the cylinder (7), the connecting piece (8) is slidably connected to the inner wall of the support plate (3), a welding block (9) is fixedly provided on the bottom of the connecting piece (8), the welding block (9) is electrically connected to the welding machine (4), the welding machine (4) is electrically connected to the grounding plate (2), a conductive disk (23) is fixedly provided on the inner wall of the limiting cylinder (11), and the lower end of the conductive disk (23) is electrically connected to the grounding plate (2).

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