Cylindrical battery structure and preparation method

Abstract

The invention discloses a cylindrical battery structure and a preparation method thereof. The battery structure comprises a hollow battery shell, a battery cell is arranged in the battery shell; a negative collector plate is arranged on the inner side of the upper end opening of the battery shell; the bottom of the negative collector plate is connected with a negative lug at the upper end of the battery cell; a negative electrode collector plate inner concave part is arranged on the peripheral outer side edge of the negative electrode collector plate; a shell inner convex part is arranged on the inner side wall of the opening in the upper end of the battery shell in a position corresponding to the inner concave part of the negative collector plate; the inner convex part of the shell is tightly attached to the inner concave part of the negative collector plate; a negative electrode cover plate top plate is arranged at the top of the negative electrode collector plate; and the bottom surface of the top plate of the cathode cover plate is connected with the top surface of the cathode collector plate. According to the cylindrical battery structure and the preparation method disclosed by the invention, the negative current collector plate concave part is arranged at the connecting position of the negative current collector plate body of the battery and the current collector plate side wing extension part, and the negative current collector plate concave part is matched with the shell inner convex part on the battery shell, so that the welding yield of the negative current collector plate is improved.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a cylindrical battery structure and a preparation method thereof. Background Art

[0002] A battery is a device that contains an electrolyte solution and metal electrodes to generate an electric current in a cup, tank or other container or part of a composite container that can convert chemical energy into electrical energy.

[0003] As a common type of battery monomer, cylindrical lithium-ion batteries are widely used in new energy vehicles. They are usually composed of battery cell components, shells, end caps and current collectors. During the battery manufacturing process, electrolyte needs to be injected into the shell so that the electrolyte fills the inside of the winding core. For batteries with injection holes, the injection holes need to be sealed after the electrolyte is injected.

[0004] In the prior art, when the negative electrode collector plate of the battery cell is assembled into the shell, it needs to have an interference fit with the shell. Since the negative electrode collector plate and the shell are prone to interference, the negative electrode collector plate is not placed flat, and poor welding such as burst points and welding leaks are very likely to occur on the negative electrode collector plate (it should be noted that the negative electrode collector plate needs to be welded to the negative electrode ear of the battery cell).

[0005] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to provide a cylindrical battery structure and a preparation method for the technical defects in the prior art.

[0007] To this end, the present invention provides a cylindrical battery structure, comprising: a hollow battery housing;

[0008] The battery housing is provided with vertically distributed battery cells;

[0009] A negative electrode current collecting plate is arranged inside the upper opening of the battery housing;

[0010] The bottom of the negative electrode collector is connected to the negative electrode ear at the upper end of the battery cell;

[0011] A plurality of negative electrode current collecting disc inner recesses are arranged on the circumferential outer edge of the negative electrode current collecting disc;

[0012] The inner side wall of the upper opening of the battery shell is provided with a plurality of shell inner protrusions at positions corresponding to the inner concave portions of the negative electrode current collector;

[0013] The inner convex part of the shell is closely fitted with the inner concave part of the negative electrode collector;

[0014] Wherein, a negative electrode cover plate top plate is arranged on the top of the negative electrode current collector plate;

[0015] The bottom surface of the negative electrode cover plate top plate is connected to the top surface of the negative electrode current collecting disk.

[0016] In addition, the present invention provides a method for preparing the cylindrical battery structure as described above, which comprises the following steps:

[0017] In the first step, the positive electrode sheet, the separator and the negative electrode sheet are wound into a battery cell with full pole ears, the positive pole ear of the battery cell is connected to the positive electrode collector plate, and the battery cell is assembled into the battery housing;

[0018] The second step is to penetrate and connect the positive electrode collector plate and the positive electrode column in the negative electrode cover plate assembly;

[0019] The third step is to weld the battery housing and the negative electrode cover plate bottom plate of the negative electrode cover plate assembly around the battery housing;

[0020] Step 4: The negative electrode ear of the battery cell is connected to the negative electrode collector plate with the negative electrode ear facing the inner convex part of the shell. At this time, the inner convex part of the shell blocks the negative electrode ear of the battery cell, so that the negative electrode ear of the battery cell will not move up further.

[0021] The fifth step is to connect the negative electrode ear of the battery cell to the bottom of the negative electrode collector plate, and to connect the negative electrode collector plate to the inner side wall of the battery housing;

[0022] The sixth step is to connect the bottom surface of the negative electrode cover plate top plate with the top surface of the negative electrode collector plate, and then connect the inner side wall of the upper end opening of the battery housing with the periphery of the negative electrode cover plate top plate.

[0023] It can be seen from the technical solution provided by the present invention above that, compared with the prior art, the present invention provides a cylindrical battery structure and a preparation method, which are scientifically designed, and a negative electrode current collector disc inner recess is provided at the connection position between the negative electrode current collector disc body of the battery and the side wing extension of the current collector disc, and the negative electrode current collector disc inner recess cooperates with the shell protrusion (i.e., the shell inner protrusion) on the battery shell, and the negative electrode current collector disc inner recess and the shell protrusion are tightly fitted, thereby effectively ensuring the stable placement of the negative electrode current collector disc, improving the welding yield rate on the negative electrode current collector disc, and having great practical significance.

[0024] In addition, by applying the present invention, the battery preparation process is optimized and the space utilization and energy density of the battery are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A three-dimensional structural diagram of a cylindrical battery structure provided by the present invention;

[0026] Figure 2 A cross-sectional view of a cylindrical battery structure provided by the present invention;

[0027] Figure 3A cross-sectional view of the upper region of a cylindrical battery structure provided by the present invention;

[0028] Figure 4 for Figure 3 A partial enlarged schematic diagram of part A shown;

[0029] Figure 5 for Figure 3 A partial enlarged schematic diagram of part B is shown;

[0030] Figure 6 A schematic diagram of a structure of a negative electrode busbar in a cylindrical battery structure provided by the present invention Figure 1 ;

[0031] Figure 7 A schematic diagram of a structure of a negative electrode busbar in a cylindrical battery structure provided by the present invention Figure 2 ;

[0032] Figure 8 A schematic diagram of the three-dimensional structure of a battery housing in a cylindrical battery structure provided by the present invention;

[0033] Fig. 9 A schematic diagram of a top view of a battery housing in a cylindrical battery structure provided by the present invention;

[0034] Fig.10 A schematic cross-sectional structure diagram of an embodiment of a battery housing in a cylindrical battery structure provided by the present invention;

[0035] Fig.11 A schematic structural diagram of an embodiment of a positive electrode current collecting disk in a cylindrical battery structure provided by the present invention;

[0036] Fig.12 A schematic diagram of a structure of a negative electrode cover assembly in a cylindrical battery structure provided by the present invention Figure 1 ;

[0037] Fig.13 A schematic diagram of a structure of a negative electrode cover assembly in a cylindrical battery structure provided by the present invention Figure 2 ;

[0038] Fig.14 A schematic diagram of a structure of a negative electrode cover assembly in a cylindrical battery structure provided by the present invention Figure 3 . DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0044] See also Figures 1 to 14 , the present invention provides a cylindrical battery structure, comprising a hollow battery housing 1;

[0045] Inside the battery housing 1, vertically distributed battery cells 6 are arranged;

[0046] A negative electrode current collecting plate 2 is provided inside the upper opening of the battery housing 1;

[0047] The bottom of the negative electrode collector plate 2 is connected to the negative electrode ear at the upper end of the battery cell 6;

[0048] A plurality of negative electrode current collecting disc inner recesses 201 are provided on the circumferential outer edge of the negative electrode current collecting disc 2;

[0049] The inner side wall of the upper opening of the battery housing 1 is provided with a plurality of housing inner protrusions 101 (i.e. housing convex points) at positions corresponding to the inner concave portions 201 of the negative electrode current collector;

[0050] The inner convex part 101 of the shell is tightly fitted with the inner concave part 201 of the negative electrode current collecting disk;

[0051] Among them, a negative electrode cover plate top plate 3 is provided on the top (i.e., the outer side) of the negative electrode current collecting disk 2;

[0052] The bottom surface of the negative electrode cover plate top plate 3 is connected to the top surface of the negative electrode current collecting plate 2;

[0053] In the present invention, in a specific implementation, a negative electrode cover plate assembly 5 is provided inside the lower opening of the battery housing 1;

[0054] The negative electrode cover plate assembly 5 comprises a negative electrode cover plate bottom plate 501;

[0055] A positive pole 502 is provided at the central opening of the negative pole cover bottom plate 501;

[0056] The positive pole 502 and the negative pole cover bottom plate 501 are separated from each other by the surrounding insulator (insulating rubber material) 503, so that the two achieve insulation effect;

[0057] The top of the positive electrode column 502 is connected to the bottom surface of a positive electrode current collecting disk 7;

[0058] The top surface of the positive electrode collector plate 7 is connected to the positive electrode ear at the lower end of the battery cell 6 .

[0059] It should be noted that, for the battery of the present invention, the negative electrode cover assembly includes a negative electrode cover bottom plate, an insulator and a positive electrode column, etc., and the combination method can be adhesive bonding, riveting, hot pressing composite, etc. The liquid injection port can be set on the positive electrode column, and can also be set on the negative electrode cover top plate 3 connected to the negative electrode collector 2.

[0060] In the present invention, in a specific implementation, the battery housing 1 is a thin-walled cylinder with through holes at both ends (i.e., openings at the upper and lower ends), and the wall thickness is 0.2-1.0 mm;

[0061] In the present invention, in a specific implementation, the shape and size of the inner convex portion 101 of the shell and the inner concave portion 201 of the negative electrode current collecting disk correspond to each other.

[0062] In the present invention, in a specific implementation, the multiple housing inner convex parts 101 are rotationally symmetrically distributed;

[0063] It should be noted that the inner side wall of the housing 1 is provided with housing inner convex parts 101 (i.e. housing convex points), the number of the housing inner convex parts is 2-10, an even number is optimal, and they are centrally symmetrically arranged;

[0064] In the present invention, in specific implementation, the housing inner convex portion 101 and the battery housing 1 are integrally formed;

[0065] In the present invention, in a specific implementation, the housing inner protrusion 101 is located at the upper end of the battery housing 1 and is radially parallel to the side wall of the battery housing 1 .

[0066] In the present invention, in specific implementation, the shape of the convex portion 101 in the housing can be arc-shaped, semicircular, polygonal, etc.;

[0067] In the present invention, in a specific implementation, the inner protrusion 101 of the shell extends into the inner cavity of the shell 1 by 0.2-1.0 mm, and is used to block the battery cell 6 and to be assembled with the negative electrode collector 2 .

[0068] In the present invention, in a specific implementation, a plurality of negative electrode current collecting disc inner recesses 201 are evenly and circumferentially arranged on the negative electrode current collecting disc 2;

[0069] In the present invention, in a specific implementation, the negative electrode current collecting disc 2 includes a negative electrode current collecting disc body 200, at least two current collecting disc side wings 2000 and a negative electrode current collecting disc through hole 204;

[0070] Each current collecting plate wing 2000 includes a current collecting plate wing extension 202, and a negative current collecting plate inner recess 201 is provided on the current collecting plate wing extension 202;

[0071] A plurality of (for example, three) current collector side wing extensions 202 are evenly arranged around and above the circumferential outer side of the negative electrode current collector body 200;

[0072] The negative electrode current collecting plate through hole 204 is disposed at the center of the negative electrode current collecting plate body 200 .

[0073] In a specific implementation, the negative electrode current collecting disc body 200 and the current collecting disc wing extension 202 are integrally formed.

[0074] In specific implementation, the negative electrode current collector body 200 is connected to the negative electrode ear 61 at the upper end of the battery cell 6;

[0075] The negative electrode current collecting plate side wing extension 202 is connected (welded) to the inner side of the top opening of the upper end of the battery casing 1 .

[0076] It should be noted that the negative electrode current collecting disc body 200 is annular, and at least two negative electrode current collecting disc welding parts are arranged on the negative electrode current collecting disc body 200, which are used for welding with the negative electrode ear of the battery cell; a negative electrode current collecting disc through hole 204 is arranged at the center position of the negative electrode current collecting disc body 200, which is arranged concentrically with the battery, and the shape of the through hole can be circular, polygonal, etc.; wherein, the current collecting disc side wing extension part 202 extends out from the periphery of the negative electrode current collecting disc body 200, and the two are arranged as one body; a negative electrode current collecting disc inner recess 201 is arranged at the connecting position of the negative electrode current collecting disc body 200 and the current collecting disc side wing extension part 202, which cooperates with the inner protrusion 101 of the shell (that is, the shell convex point), and the negative electrode current collecting disc inner recess 201 and the shell convex point are tightly fitted.

[0077] It should be noted that at least two current collecting disc wings are provided on the negative electrode current collecting disc body 200, and the current collecting disc wings include: a wing edge facing the side of the cover plate (i.e., the current collecting disc side wing extension 202), and a negative electrode current collecting disc inner recess 201 on the current collecting disc side wing extension 202, facing the battery cell and abutting against the inner protrusion 101 of the shell (i.e., the shell convex point).

[0078] In a specific implementation, the angle between the collecting plate side wing 2000 (specifically, the collecting plate side wing extension 202) and the top surface of the negative electrode collecting plate body 200 is 100°-150°.

[0079] It should be noted that the collector disc wing extension 202 is connected to the circumferential edge of the negative electrode collector disc body 200, and can be bent relative to the body so that the collector disc wing is inclined and arranged at an angle with the collector disc body, and the angle is 100°-150°. Such an arrangement can make the collector disc wing have a buffering effect, reduce safety hazards, and improve safety. The angle can be 100°, 110°, 120°, 130°, 140°, 150°. If the angle is too small, the collector disc wing has less contact with the shell, and poor welding is likely to occur; if the angle is too large, the gap between the collector disc wing and the shell is too large, and the two are not easy to clamp, resulting in poor welding.

[0080] In the present invention, in a specific implementation, the inner recess 201 of the negative electrode current collecting disc is located at the end where the side wing extension 202 of the current collecting disc is connected to the negative electrode current collecting disc body 200;

[0081] In specific implementation, the shape of the inner recess 201 of the negative electrode current collector is an arc, semicircle, polygon or trapezoid, which is the same as and compatible with the shape of the inner protrusion 101 of the shell (i.e., the shell convex point), and the inner recess 201 of the negative electrode current collector has a depth of 0.22-1.05mm.

[0082] In the present invention, in a specific implementation, the side wing extension 202 of the current collecting plate is welded to the inner side wall of the upper opening of the battery housing 1. By providing the side wing of the current collecting plate, the strength of the current collecting plate body can be improved, the reliability of the electrical connection between the current collecting plate and the battery housing can be ensured, and the deformation of the current collecting plate can be avoided during the processing of the shrinkage.

[0083] In this embodiment, three collecting disc side wings may be provided, and the three collecting disc side wings are evenly spaced along the periphery of the negative electrode collecting disc body 200 , and each collecting disc side wing extension 202 has a height of 10 mm-20 mm and a width of 4 mm-8 mm.

[0084] It should be noted that after the negative collector disc 2 is put into the shell, it is assembled with the battery cell by positioning the inner recess 201 of the negative collector disc and the inner protrusion 101 of the shell (i.e., the shell convex point). The negative collector disc body 200 is connected to the negative ear of the battery cell, and the negative collector disc side wing extension 202 is connected to the battery shell 1. The welding support is pressed on the overlapping area of ​​the inner protrusion 101 of the shell (i.e., the shell convex point) and the inner recess 201 of the negative collector disc to ensure that the shell and the negative collector disc extension are pressed tightly, so that the welding process is good. The welding method can be: penetration welding of the battery shell and the collector disc extension (i.e., the negative collector disc side wing extension 202), or lap welding of the two.

[0085] In the present invention, in a specific implementation, at least two negative electrode current collector plate welding parts are provided on the negative electrode current collector plate body 200, which are used to be welded with the negative electrode ear 61 of the battery cell 6;

[0086] It should be noted that the tab welding of the battery cell, the welding part of the negative electrode current collecting disc and the side wing of the current collecting disc (specifically, the inner recessed part 201 of the negative electrode current collecting disc) are arranged alternately.

[0087] Preferably, three negative electrode current collecting disc welding parts are provided, and three current collecting disc side wings 2000 (specifically, the current collecting disc side wing extensions 202) are provided. The negative electrode current collecting disc welding parts and the current collecting disc side wings 2000 are staggered and spaced apart, that is, the current collecting disc side wings (specifically, the current collecting disc side wing extensions 202) and the negative electrode current collecting disc welding parts are not integrally connected. Such an arrangement can prevent the thermal effects of the two welds from interfering with each other, otherwise interference will occur, causing another weld to be poor.

[0088] Preferably, the angle between the center of the negative electrode current collecting plate welding portion and the center of the current collecting plate wing (specifically, the current collecting plate wing extension portion 202) is 60°.

[0089] In the present invention, in a specific implementation, the diameter of the negative electrode current collecting disc body 200 is 36mm-42mm, and the thickness is 0.2mm-0.6mm. By limiting the thickness of the current collecting disc body, the strength of the current collecting disc body can be ensured, and the connection stability between the current collecting disc and the battery housing can be ensured.

[0090] In the present invention, in a specific implementation, after the negative electrode current collector 2 is welded into the shell, the battery shell 1 and the negative electrode cover plate top plate 3 are connected at the periphery, and the connection method is laser welding. The injection hole can be located on the side of the negative electrode cover plate top plate 3, or can be set on the positive electrode column, and the sealing is performed after the injection is completed.

[0091] In order to prepare the cylindrical battery structure provided by the present invention, the present invention also provides a method for preparing the cylindrical battery structure, which comprises the following steps:

[0092] In the first step, the positive electrode sheet, the separator and the negative electrode sheet are wound into a battery cell 6 with full pole ears, the positive pole ear of the battery cell 6 is connected to the positive electrode collector plate 7, and the battery cell 6 is assembled into the battery housing 1;

[0093] The second step is to penetrate and connect the positive electrode current collecting plate 7 and the positive electrode column 502 in the negative electrode cover plate assembly 5;

[0094] The third step is to weld the battery housing and the negative electrode cover plate assembly 5 (specifically the negative electrode cover plate bottom plate 501) around the battery housing;

[0095] Step 4: The negative electrode ear of the battery cell 6 is connected to the negative electrode collector plate 2 with the negative electrode ear facing the inner convex part 101 of the shell. At this time, the inner convex part 101 of the shell blocks the negative electrode ear of the battery cell 6, so that the negative electrode ear of the battery cell 6 will not move up further.

[0096] Step 5: Connect the negative electrode ear 61 of the battery cell 6 to the bottom of the negative electrode collector plate 2, and connect the negative electrode collector plate 2 to the inner wall of the battery housing 1;

[0097] In the sixth step, the bottom surface of the negative electrode cover plate top plate 3 is connected to the top surface of the negative electrode current collecting disk 2, and then the inner side wall of the upper end opening of the battery housing 1 is connected (welded) to the periphery of the negative electrode cover plate top plate 3.

[0098] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A cylindrical battery structure, characterized in that: include: A hollow battery housing (1); Vertically distributed battery cells (6) are arranged in the battery housing (1); A negative electrode current collecting plate (2) is arranged inside the upper opening of the battery housing (1); The bottom of the negative electrode current collecting plate (2) is connected to the negative electrode ear at the upper end of the battery cell (6); A plurality of negative electrode current collecting disc inner recesses (201) are provided on the circumferential outer edge of the negative electrode current collecting disc (2); The inner side wall of the upper opening of the battery housing (1) is provided with a plurality of housing inner protrusions (101) at positions corresponding to the inner recesses (201) of the negative electrode current collecting disk; The inner convex part (101) of the shell is tightly fitted with the inner concave part (201) of the negative electrode current collecting disk; Wherein, a negative electrode cover plate top plate (3) is arranged on the top of the negative electrode current collecting plate (2); The bottom surface of the negative electrode cover plate top plate (3) is connected to the top surface of the negative electrode current collecting plate (2).

2. The cylindrical battery structure according to claim 1, characterized in that: A negative electrode cover plate assembly (5) is arranged inside the lower opening of the battery housing (1); A negative electrode cover plate assembly (5), comprising a negative electrode cover plate bottom plate (501); A positive electrode column (502) is arranged at the central opening of the negative electrode cover bottom plate (501); The positive pole column (502) and the negative pole cover plate bottom plate (501) are separated from each other by an insulator (503) distributed around them; The top of the positive electrode column (502) is connected to the bottom surface of a positive electrode current collecting disk (7); The top surface of the positive electrode current collecting disk (7) is connected to the positive electrode ear at the lower end of the battery cell (6).

3. The cylindrical battery structure according to claim 1, characterized in that: The shape and size of the inner convex part (101) of the shell and the inner concave part (201) of the negative electrode current collecting disk correspond to each other.

4. The cylindrical battery structure according to claim 1, characterized in that: The plurality of convex parts (101) in the shell are distributed in a rotationally symmetrical manner; The inner convex portion (101) of the housing is integrally formed with the battery housing (1).

5. The cylindrical battery structure according to claim 1, characterized in that: A negative electrode current collecting disc (2), comprising a negative electrode current collecting disc body (200), at least two current collecting disc side wings (2000) and a negative electrode current collecting disc through hole (204); Each current collecting disc side wing (2000) comprises a current collecting disc side wing extension (202), and a negative electrode current collecting disc inner recess (201) is arranged on the current collecting disc side wing extension (202); A plurality of current collecting disc side wing extensions (202) are evenly arranged around and above the circumferential outer side of the negative electrode current collecting disc body (200); The negative electrode current collecting disc through hole (204) is arranged at the center position of the negative electrode current collecting disc body (200).

6. The cylindrical battery structure according to claim 5, characterized in that: The negative electrode current collecting plate body (200) is connected to the negative electrode ear (61) at the upper end of the battery cell (6); The negative electrode current collecting plate side wing extension (202) is connected to the inner side of the top opening of the upper end of the battery casing (1).

7. The cylindrical battery structure according to claim 5, characterized in that: The body of the current collecting disc side wing (2000) is such that the angle between the protruding portion (202) of the current collecting disc side wing and the top surface of the negative electrode current collecting disc body (200) is 100°-150°.

8. The cylindrical battery structure according to claim 5, characterized in that: At least two negative electrode current collector plate welding parts are arranged on the negative electrode current collector plate body (200) and are used for welding with the negative electrode ear (61) of the battery cell (6).

9. The cylindrical battery structure according to claim 8, characterized in that: Three negative electrode current collecting disc welding parts are provided, and three current collecting disc side wings (2000) are provided; The negative electrode current collecting plate welding portion and the current collecting plate side wing (2000) are staggered and arranged at intervals.

10. A method for preparing a cylindrical battery structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: In the first step, the positive electrode sheet, the separator and the negative electrode sheet are wound into a battery cell (6) with full pole ears, the positive pole ears of the battery cell (6) are connected to the positive electrode collector plate (7), and the battery cell (6) is assembled into the battery housing (1); The second step is to penetrate and connect the positive electrode current collecting plate (7) and the positive electrode column (502) in the negative electrode cover plate assembly (5); The third step is to weld the battery housing and the negative electrode cover plate bottom plate (501) of the negative electrode cover plate assembly (5) around the battery housing; In the fourth step, the negative electrode ear of the battery cell (6) is connected to the negative electrode current collecting plate (2) with the negative electrode ear facing the inner convex part (101) of the shell. At this time, the inner convex part (101) of the shell blocks the negative electrode ear of the battery cell (6), so that the negative electrode ear of the battery cell (6) will not move up further. The fifth step is to connect the negative electrode ear (61) of the battery cell (6) to the bottom of the negative electrode current collecting plate (2), and to connect the negative electrode current collecting plate (2) to the inner side wall of the battery housing (1); The sixth step is to connect the bottom surface of the negative electrode cover plate top plate (3) with the top surface of the negative electrode current collecting plate (2), and then connect the inner side wall of the upper end opening of the battery housing (1) with the periphery of the negative electrode cover plate top plate (3).

Images