Cylindrical battery

Abstract

The utility model provides a cylindrical battery which comprises a shell, a bottom support, a current collecting disc, a roll core, a connecting sheet, an insulating disc, a pole and a cover plate, an accommodating cavity for accommodating the roll core is formed in the shell; the bottom support is made of an insulating material and is arranged at the bottom of the accommodating cavity; the flow collecting disc is arranged in the containing cavity and attached to the bottom support. The roll core is arranged in the containing cavity and located above the current collecting disc, one of the positive electrode and the negative electrode of the roll core is connected with the current collecting disc, and the other one is connected with the connecting piece; the insulating disc is mounted between the pole and the cover plate; the pole is conductively connected with the collector plate; the connecting sheet is folded once and is welded with the surface, facing one side of the shell, of the cover plate, and an insulating gap is formed between the connecting sheet and the pole; the cover plate is hermetically welded with the top of the shell. The thickness of the connecting piece can be increased through single folding of the connecting piece, the overflowing capacity of the connecting piece is obviously improved, the difficulty of concentricity of the cover plate and the shell is reduced, the roll core is located above the current collecting disc, and the welding position of the current collecting disc and the roll core tab cannot fall off in the vibration process.

Description

Technical Field

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

[0002] In the production process of cylindrical batteries, there are currently two main welding solutions: one is to perform a "Z" - shaped bending after welding the connecting piece to the wound core, and then welding it to the cover plate; the other is to directly weld the current collector plate to the connection point of the cover plate after welding it to the wound core to achieve a hard connection of the wound core, so as to pass a large current and achieve high - rate test performance of the battery.

[0003] However, the "Z" - shaped bending requires folding the connecting piece twice, making it difficult to ensure the concentricity between the cover plate and the housing. It is easy to have misalignment between the cover plate and the housing, resulting in damage to the housing or the cover plate, scrapping the battery or reworking it, increasing costs. Moreover, for the "Z" - shaped bending operation, the thickness of the connecting piece cannot be too thick, between 0.2 mm and 0.4 mm. Otherwise, if it is too thin, the current - carrying capacity is poor; if it is too thick, the bending is difficult, and after folding, it occupies a large space when inserted into the housing, and the connecting piece is likely to press the pole ear of the wound core, easily causing a short - circuit phenomenon. The hard connection of the wound core is likely to cause the welding point between the current collector plate and the pole ear of the wound core to fall off during vibration, increasing the internal resistance of the battery, increasing polarization during high - rate charge and discharge, affecting the battery performance, and there is a risk in the vibration test. Summary of the Utility Model

[0004] In view of this, the utility model provides a cylindrical battery to solve the technical problems in the above - mentioned background art that the "Z" - shaped bending requires folding the connecting piece twice, making it difficult to ensure the concentricity between the cover plate and the housing, and easy to have misalignment between the cover plate and the housing, resulting in damage to the housing or the cover plate; the hard connection of the wound core is likely to cause the welding point between the current collector plate and the pole ear of the wound core to fall off during vibration, increasing the internal resistance of the battery.

[0005] The technical solution of the utility model is realized as follows:

[0006] The utility model provides a cylindrical battery, including a housing, a bottom tray, a current collector plate, a wound core, a connecting piece, an insulating disk, a pole column, and a cover plate, wherein:

[0007] An opening is provided at the top of the housing, and a receiving cavity for accommodating the wound core is provided inside the housing;

[0008] The bottom tray is made of insulating material and is arranged at the bottom of the receiving cavity;

[0009] The current collector plate is arranged in the receiving cavity and is attached to the bottom tray, and there is a gap between the current collector plate and the inner wall of the receiving cavity;

[0010] The core is disposed in the accommodation cavity and above the current collector disk. One of the positive and negative electrodes of the core is connected to the current collector disk, and the other is connected to the connecting piece.

[0011] The insulating disk, the cover plate, and the pole column are coaxial, and the insulating disk is installed between the pole column and the cover plate.

[0012] The pole column is electrically connected to the current collector disk.

[0013] The connecting piece is folded in half once and welded to the surface of the cover plate facing the housing side. There is an insulating gap between the connecting piece and the pole column.

[0014] The cover plate is hermetically welded to the top of the housing.

[0015] On the basis of the above technical solutions, preferably, the connecting piece includes a connecting piece body and a bending plate; the connecting piece body is semicircular, and an avoidance hole is provided at the center of the connecting piece body; one end of the bending plate is connected to the diameter side of the connecting piece body, the avoidance hole is coaxial with the pole column, and the radius of the avoidance hole is greater than the radius of the pole column.

[0016] On the basis of the above technical solutions, preferably, the insulating disk is provided with a positioning portion. The positioning portion intersects the outer wall of the insulating disk and is parallel to the radial direction of the insulating disk. The side of the bending plate is attached to the positioning portion.

[0017] On the basis of the above technical solutions, preferably, a crease groove is provided on the bending plate, and the bending plate is folded along the crease groove so that the avoidance hole is coaxial with the pole column.

[0018] On the basis of the above technical solutions, preferably, the folded bending plate is in a V shape, and the bending plate is located outside the entire circle where the avoidance hole is located.

[0019] On the basis of the above technical solutions, preferably, the current collector disk is provided with a central column along the axial direction. The core is wound around the central column, and the central column is electrically connected to the pole column.

[0020] On the basis of the above technical solutions, preferably, the pole column is provided with a connection hole along the axial direction. The central column is inserted into the connection hole and welded to the top edge of the connection hole.

[0021] On the basis of the above technical solutions, preferably, a liquid injection hole is provided at one end of the central column away from the current collector disk.

[0022] Based on the above technical solutions, preferably, the cover plate is provided with mounting holes; an annular protrusion is provided in the mounting holes, an annular groove matching the annular protrusion is provided on the outer wall of the insulating disk, and a mounting protrusion is provided on the inner wall of the insulating disk; a mounting groove matching the mounting protrusion is provided on the outer wall of the pole column.

[0023] Based on the above technical solutions, preferably, the current collector plate includes a current collector plate body, a plurality of elastic pieces, and a plurality of support columns. One end of each elastic piece is connected to a position of the current collector plate body close to the outer wall. The other ends of the plurality of elastic pieces converge and are connected to each other at the axis of the current collector plate body. The support columns are connected to the bottom surface of the end of the elastic piece connected to the position of the current collector plate body close to the outer wall.

[0024] The cylindrical battery of the present utility model has the following beneficial effects compared with the prior art:

[0025] (1) By folding the connecting piece once, the thickness of the connecting piece can be increased, and the effect after folding is not affected. The difficulty of concentricity between the cover plate and the housing is reduced, the current-carrying capacity of the connecting piece is significantly increased, enabling the battery to effectively carry current and realizing high-rate testing.

[0026] The winding core is located above the current collector plate. The current collector plate is electrically connected to the pole column. During the vibration process, the welding point between the current collector plate and the pole ear of the winding core will not fall off, and the internal resistance of the battery will not increase due to this, resulting in an increase in polarization during high-rate charge and discharge and affecting the battery performance. Also, the risk of vibration testing can be reduced.

[0027] (2) One of the positive and negative electrodes of the winding core is connected to the pole column, and the other is connected to the connecting piece. The connecting piece is welded to the surface of the cover plate facing the housing. The insulating disk is installed between the pole column and the cover plate, so as to insulate between the pole column and the cover plate. The cover plate is hermetically welded to the top of the housing. By making the housing charged, the bottom of the housing can be used as the positive or negative electrode of the battery, reducing the protrusion of the pole column and facilitating placement.

[0028] (3) By providing a crease groove on the bending plate and folding the bending plate along the crease groove, the avoidance hole is coaxial with the pole column. With the assistance of the crease groove for folding, the avoidance hole after folding is coaxial with the pole column, ensuring the existence of the insulating gap between the connecting piece and the pole column and increasing the product yield.

[0029] (4) By providing a positioning portion on the insulating disk, the positioning portion intersects with the outer wall of the insulating disk and is parallel to the radial direction of the insulating disk. The side of the bending plate fits with the positioning portion, assisting in positioning the bending plate, facilitating the pre-welding positioning of the connecting piece, and improving the assembly efficiency.

[0030] (5) A central column is provided along the axial direction through the current collector plate. The core is wound around the central column, and the central column is electrically connected to the pole column. By connecting the central column to the pole column, it can bear the force together with the pole column and the cover plate, avoiding deformation of the cover plate due to the increase in the diameter of the battery and preventing collapse of the battery cover plate.

[0031] (6) The avoidance hole is coaxial with the pole column, and the radius of the avoidance hole is greater than the radius of the pole column, ensuring that an insulating gap is maintained between the connecting piece body and the pole column.

[0032] The bending plate is located outside the entire circle where the avoidance hole is located, so that an insulating gap is maintained between the bending plate and the pole column.

[0033] (7) A liquid injection hole is provided at one end of the central column away from the current collector plate. Since the central column is located at the center of the battery, the operation of finding the hole during the liquid injection process of the cylindrical battery can be omitted, and the problem of inaccurate alignment during the hole finding and alignment process can be avoided, improving the production efficiency and the yield rate of the battery.

[0034] (8) The current collector plate includes a current collector plate body, a plurality of elastic pieces and a plurality of support columns. One end of the elastic piece is connected to a position near the outer wall of the current collector plate body. The other ends of the plurality of elastic pieces converge and are connected to each other at the axis of the current collector plate body. The support column is connected to the bottom surface of the end of the elastic piece connected to the position near the outer wall of the current collector plate body. Due to the elastic force of the elastic piece, there is a certain stress release space during the battery assembly process, so that during the subsequent use of the battery, the pulling force generated during the vibration process can be effectively offset, ensuring the welding effect of the pole ears at both ends of the core and enabling effective current conduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 It is a cross-sectional view of the cylindrical battery of the present invention;

[0037] Figure 2 It is an exploded view of the cylindrical battery of the present invention;

[0038] Figure 3 It is a three-dimensional view of the cylindrical battery of the present invention;

[0039] Figure 4 It is of the present invention Figure 1 Partial enlarged view of part A;

[0040] Figure 5 For the present utility model Figure 1 Partial enlarged view of part B in

[0041] Figure 6 Schematic structural view of the connecting piece (before folding), cover plate and insulating disc of the present utility model

[0042] Figure 7 Schematic structural view of the connecting piece (after folding), cover plate and insulating disc of the present utility model

[0043] Figure 8 Schematic structural view of the connecting piece of the present utility model

[0044] Figure 9 Schematic structural view of the current collecting disc and the central column of the present utility model

[0045] Figure 10 Cross-sectional view of the insulating disc of the present utility model

[0046] Figure 11 Cross-sectional view of the pole column of the present utility model

[0047] Figure 12 Cross-sectional view of the cover plate of the present utility model

[0048] Explanation of reference numerals in the drawings: 1 - housing, 2 - bottom support, 3 - current collecting disc, 4 - winding core, 5 - connecting piece, 6 - insulating disc, 7 - pole column, 8 - cover plate, 9 - central column;

[0049] 11 - accommodating cavity;

[0050] 31 - current collecting disc body, 32 - elastic piece, 33 - support column;

[0051] 51 - connecting piece body, 511 - avoidance hole, 52 - bending plate, 521 - crease groove;

[0052] 61 - positioning part, 62 - annular groove, 63 - mounting projection;

[0053] 71 - connecting hole, 72 - mounting groove;

[0054] 81 - mounting hole, 82 - annular projection;

[0055] 91 - liquid injection hole. Detailed implementation manners

[0056] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0057] It should be noted that in this embodiment, without insulation description, the components are all conductive parts.

[0058] Refer to Figures 1 - 12 As shown, this embodiment proposes a cylindrical battery, including a housing 1, a bottom tray 2, a current collector plate 3, a wound core 4, a connecting piece 5, an insulating disc 6, a pole column 7 and a cover plate 8, wherein:

[0059] The top of the housing 1 is provided with an opening, and an accommodating cavity 11 for accommodating the wound core 4 is arranged inside the housing 1;

[0060] The bottom tray 2 is made of an insulating material and is arranged at the bottom of the accommodating cavity 11;

[0061] The current collector plate 3 is arranged in the accommodating cavity 11 and is attached to the bottom tray 2. There is a gap between the current collector plate 3 and the inner wall of the accommodating cavity 11 to ensure insulation between the current collector plate 3 and the housing 1. The current collector plate 3, the bottom tray 2 and the housing 1 are coaxial;

[0062] The wound core 4 is arranged in the accommodating cavity 11 and is located above the current collector plate 3. One of the positive and negative electrodes of the wound core 4 is connected to the current collector plate 3, and the other is connected to the connecting piece 5;

[0063] The insulating disc 6, the cover plate 8 and the pole column 7 are coaxial, and the insulating disc 6 is installed between the pole column 7 and the cover plate 8, so as to insulate between the pole column 7 and the cover plate 8;

[0064] The pole column 7 is electrically connected to the current collector plate 3;

[0065] The connecting piece 5 is folded once and welded to the surface of the cover plate 8 facing the housing 1. There is an insulating gap between the connecting piece 5 and the pole column 7;

[0066] The cover plate 8 is hermetically welded to the top of the housing 1.

[0067] The cylindrical battery provided in this embodiment can increase the thickness of the connecting piece 5 by folding the connecting piece 5 once, and does not affect the effect after folding. The difficulty of making the cover plate 8 concentric with the housing 1 is reduced, and the current-carrying capacity of the connecting piece 5 is significantly increased, enabling the battery to effectively carry current and achieve high-rate testing. The winding core 4 is located above the current collector plate 3, and the current collector plate 3 is electrically connected to the pole column 7. During vibration, the welded joint between the current collector plate 3 and the tab of the winding core 4 will not fall off, and the internal resistance of the battery will not increase due to this, resulting in increased polarization during high-rate charge and discharge and affecting the battery performance. It can also reduce the risk of vibration testing. By making the housing 1 charged, the bottom of the housing 1 can be used as the positive or negative electrode of the battery, reducing the protrusion of the pole column 7 and facilitating placement. The positive and negative electrodes of the battery can be located at both ends of the battery; or the positive and negative electrodes of the battery are located at the same end of the battery (the cover plate 8 serves as the positive or negative electrode), providing different types of grouping welding methods for module assembly.

[0068] In some embodiments, the connecting piece 5 includes a connecting piece body 51 and a bending plate 52. The connecting piece body 51 is semicircular, and an avoidance hole 511 is provided at the center of the connecting piece body 51. One end of the bending plate 52 is connected to the diameter side of the connecting piece body 51. The avoidance hole 511 is coaxial with the pole column 7, and the radius of the avoidance hole 511 is greater than the radius of the pole column 7. After the bending plate 52 is welded to the cover plate 8, the bending plate 52 is folded so that the connecting piece body 51 contacts the cover plate 8 and maintains a certain distance from the pole column 7. The avoidance hole 511 is located in the area where the insulating disk 6 is located, and then the outer ring of the connecting piece body 51 is welded to the cover plate 8. By making the avoidance hole 511 coaxial with the pole column 7 and the radius of the avoidance hole 511 greater than the radius of the pole column 7, it is ensured that an insulating gap is maintained between the connecting piece body 51 and the pole column 7, ensuring insulation between the connecting piece 5 and the pole column 7, avoiding short circuit between the positive and negative electrodes of the battery, and improving the reliability and stability of the device.

[0069] In some embodiments, the insulating disk 6 is provided with a positioning portion 61. The positioning portion 61 intersects the outer wall of the insulating disk 6 and is parallel to the radial direction of the insulating disk 6. The side of the bending plate 52 fits with the positioning portion 61. By making the side of the bending plate 52 fit with the positioning portion 61, the bending plate 52 is assisted in positioning, facilitating pre-welding positioning of the connecting piece 5 and improving the assembly efficiency.

[0070] In some embodiments, the bending plate 52 is provided with a crease groove 521. The bending plate 52 is folded along the crease groove 521 so that the avoidance hole 511 is coaxial with the pole column 7. By assisting the folding through the crease groove 521, the avoidance hole 511 after folding is coaxial with the pole column 7, ensuring the existence of the insulating gap between the connecting piece 5 and the pole column 7 and increasing the product yield.

[0071] In some embodiments, the bent plate 52 after being folded in half is in a V shape, and the bent plate 52 is located outside the entire circle where the avoidance hole 511 is located. By the bent plate 52 being located outside the entire circle where the avoidance hole 511 is located, an insulating gap is maintained between the bent plate 52 and the pole column 7, ensuring insulation between the connecting piece 5 and the pole column 7, avoiding short circuit between the positive and negative electrodes of the battery, and improving the reliability and stability of the device.

[0072] In some embodiments, a central column 9 is provided on the current collector plate 3 along the axial direction, the winding core 4 is wound around the central column 9, and the central column 9 is electrically connected to the pole column 7. By electrically connecting the central column 9 to the pole column 7, electrical conduction between the current collector plate 3 and the pole column 7 is achieved. By connecting the central column 9 to the pole column 7, it can bear force together with the pole column 7 and the cover plate 8, avoiding deformation of the cover plate 8 due to the increase in the diameter of the battery, preventing the battery cover plate 8 from collapsing, and enabling the diameter of the battery to be set larger, improving the applicability of the cylindrical battery.

[0073] In some embodiments, a connection hole 71 is provided on the pole column 7 along the axial direction, the central column 9 is embedded in the connection hole 71 and welded to the top edge of the connection hole 71. By the central column 9 being embedded in the connection hole 71, it is convenient for concentric positioning of the central column 9 and the pole column 7. Welding the central column 9 to the top edge of the connection hole 71 can be carried out after welding the cover plate 8 and the housing 1, and the positive and negative electrodes of the winding core 4 are finally connected, reducing the risk of battery short circuit during the assembly process and improving the safety during the assembly process. In actual design, the top of the central column 9 can be set flush with the top of the connection hole 71, which is convenient for welding and more aesthetically pleasing.

[0074] In some embodiments, a liquid injection hole 91 is provided at one end of the central column 9 away from the current collector plate 3, and the liquid injection hole 91 is inclined from the center of the top of the central column 9 towards the outer wall of the central column 9. By providing the liquid injection hole 91 at one end of the central column 9 away from the current collector plate 3, and the central column 9 being located at the center of the battery, the operation of finding the hole during the liquid injection process of the cylindrical battery can be omitted, and the problem of inaccurate alignment during the hole finding and alignment process can be avoided, improving the production efficiency and the yield rate of the battery.

[0075] In some embodiments, the cover plate 8 is provided with a mounting hole 81; an annular protrusion 82 is provided in the mounting hole 81, an annular groove 62 matching the annular protrusion 82 is provided on the outer wall of the insulating disk 6, and a mounting protrusion 63 is provided on the inner wall of the insulating disk 6; a mounting groove 72 matching the mounting protrusion 63 is provided on the outer wall of the pole column 7. During installation, first snap the mounting protrusion 63 into the mounting groove 72 to connect the insulating disk 6 to the pole column 7, then install the insulating disk 6 in the mounting hole 81 of the cover plate 8, snap the annular groove 62 into the annular protrusion 82. The insulating disk 6 is an injection molded part and has a certain elasticity, so that the lower edge of the annular groove 62 can be snapped into the annular protrusion 82, and then the upper edge of the annular groove 62 contacts the annular protrusion 82, so that the annular protrusion 82 is snapped into the annular groove 62.

[0076] In some embodiments, the current collector plate 3 includes a current collector plate body 31, a plurality of elastic pieces 32 and a plurality of support columns 33. One end of the elastic piece 32 is connected to a position of the current collector plate body 31 close to the outer wall. The other ends of the plurality of elastic pieces 32 converge and are connected to each other at the axis of the current collector plate body 31. The support column 33 is connected to the bottom surface of the end of the elastic piece 32 connected to the position of the current collector plate body 31 close to the outer wall, so as to support and limit the elastic piece 32, prevent the elastic piece 32 from exceeding the elastic limit and being unable to reset, and improve the reliability and stability. Through the elastic force of the elastic piece 32, there is a certain stress release space during the battery assembly process, so that during the subsequent use of the battery, the pulling force generated during the vibration process can be effectively offset, the welding effect at the positions of the tab ears at both ends of the wound core 4 is ensured, and effective current conduction is achieved.

[0077] The working principle of this cylindrical battery is as follows: After the wound core 4 is wound, the tab ears at both ends of the wound core 4 are flattened and perforated, the current collector plate 3 and the wound core 4 are assembled and laser welded, and the insulating bottom bracket 2 is assembled on the same side synchronously. The wound core 4 and the current collector plate 3 are placed in the accommodating cavity 11 and attached to the bottom of the housing 1; the connecting piece 5 is welded to the cover plate 8, and then the connecting piece 5 is welded to the wound core 4. The cover plate 8 is folded over so that the connecting piece 5 is folded in half to realize the assembly of the cover plate 8 and the housing 1. The central column 9 is assembled in the mounting hole 81 of the cover plate 8, the cover plate 8 and the housing 1 are laser welded, and then the support column 33 is welded to the top of the mounting hole 81 to realize the overall welding of the battery. Liquid injection is carried out through the liquid injection hole 91. After the liquid injection is liquefied, operations such as helium filling and sealing nail welding are carried out on the battery to realize the complete sealing of the battery. The connecting piece 5 is folded in half once, which can increase the thickness of the connecting piece 5 and does not affect the effect after folding. The difficulty of concentricity between the cover plate 8 and the housing 1 is reduced, the current-carrying capacity of the connecting piece 5 is significantly increased, so that the battery can effectively conduct current and realize high-rate testing; during vibration, the welding joint between the current collector plate 3 and the tab ear of the wound core 4 will not fall off, and the polarization will not increase during high-rate charge and discharge due to the increase of the battery internal resistance, which affects the battery performance, and the risk of vibration testing can also be reduced.

[0078] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A cylindrical battery, characterized in that: It includes a shell, a bottom bracket, a collector plate, a winding core, a connecting piece, an insulating disk, a pole and a cover plate, wherein: The top of the shell is provided with an opening, and the shell is provided with a receiving cavity for receiving the winding core; The base is made of insulating material and is arranged at the bottom of the accommodating cavity; The collecting plate is arranged in the accommodating cavity and is attached to the base, and a gap is provided between the collecting plate and the inner wall of the accommodating cavity; The winding core is arranged in the accommodating cavity and is located above the current collecting disk. One of the positive and negative electrodes of the winding core is connected to the current collecting disk, and the other is connected to the connecting sheet. The insulating disk, the cover plate and the pole are coaxial, and the insulating disk is installed between the pole and the cover plate; The pole is conductively connected to the collector plate; The connecting piece is folded in half once and welded to the surface of the cover plate facing the housing, and an insulating gap is provided between the connecting piece and the pole; The cover plate is sealed and welded to the top of the shell.

2. The cylindrical battery according to claim 1, characterized in that: The connecting piece includes a connecting piece body and a bending plate; the connecting piece body is semicircular, and a avoidance hole is arranged at the center of the connecting piece body; one end of the bending plate is connected to the diameter edge of the connecting piece body, the avoidance hole is coaxial with the pole, and the radius of the avoidance hole is greater than the radius of the pole.

3. The cylindrical battery according to claim 2, characterized in that: The insulating disk is provided with a positioning portion, which is tangent to the outer wall of the insulating disk and parallel to the radial direction of the insulating disk, and the side edge of the bent plate is in contact with the positioning portion.

4. The cylindrical battery according to claim 3, characterized in that: The bending plate is provided with a crease groove, and the bending plate is folded along the crease groove so that the avoidance hole is coaxial with the pole.

5. The cylindrical battery according to claim 4, characterized in that: The folded bending plate is V-shaped, and the folded bending plate is located outside the full circle where the avoidance hole is located.

6. The cylindrical battery according to claim 5, characterized in that: The current collecting disk is provided with a central column along the axial direction, the winding core is wound on the central column, and the central column is conductively connected to the pole.

7. The cylindrical battery according to claim 6, characterized in that: The pole is provided with a connection hole along the axial direction, and the center column is embedded in the connection hole and welded to the top edge of the connection hole.

8. The cylindrical battery according to claim 7, characterized in that: An injection hole is arranged at one end of the central column away from the current collecting plate.

9. The cylindrical battery according to any one of claims 1 to 8, characterized in that: The cover plate is provided with a mounting hole; an annular protrusion is provided in the mounting hole, the outer wall of the insulating disk is provided with an annular groove matching the annular protrusion, the inner wall of the insulating disk is provided with a mounting protrusion; the outer wall of the pole is provided with a mounting groove matching the mounting protrusion.

10. The cylindrical battery according to any one of claims 1 to 8, characterized in that: The current collecting plate includes a current collecting plate body, a plurality of spring clips and a plurality of support columns, one end of the spring clip is connected to a position of the current collecting plate body close to the outer wall, the other ends of the plurality of spring clips are concentrated at the axis of the current collecting plate body and connected to each other, and the support column is connected to the bottom surface of one end of the spring clip connected to the position of the current collecting plate body close to the outer wall.

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