Cylindrical battery structure

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a cylindrical battery structure. The cylindrical battery structure comprises a sleeve, a battery cell and a composite circuit board, the composite circuit board is located between the sleeve and the battery cell, the composite circuit board is integrally formed by a rigid circuit board, a flexible circuit board, a connector, a positive electrode nickel sheet and a negative electrode nickel sheet, and the rigid circuit board is fixed to the radial outer side of the battery cell; a plurality of components are mounted on one side of the rigid circuit board; the rigid circuit board is provided with a first end and a second end, the flexible circuit board and the positive electrode nickel sheet are integrally formed at the first end of the rigid circuit board, the negative electrode nickel sheet is integrally formed at the second end of the rigid circuit board, the positive electrode nickel sheet is welded on the positive electrode of the battery cell, and the negative electrode nickel sheet is welded on the negative electrode of the battery cell; and the connector is integrally formed at one end, far away from the rigid circuit board, of the flexible circuit board and extends out of the sleeve, so that the assembly process and the welding process are simplified, and full-automatic manufacturing of the cylindrical battery structure is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a cylindrical battery structure. Background Art

[0002] The cylindrical battery includes a sleeve, a battery cell, a circuit board, a plug wire, a positive nickel sheet and a negative nickel sheet. One end of the plug wire is connected to a plug. When assembling the battery, you need to first weld the plug wire to the circuit board, then weld the positive nickel sheet to the positive connection point of the circuit board, and weld the negative nickel sheet to the negative connection point of the circuit board to form an assembly. Then, weld the positive nickel sheet of the assembly to the positive electrode of the battery cell, and weld the negative nickel sheet to the negative electrode of the battery cell. Finally, put the sleeve on the outside of the battery cell, and the plug extends out of the sleeve.

[0003] In the process of assembling cylindrical batteries, the positive nickel sheet, negative nickel sheet and plug wire need to be welded to the circuit board separately first, which increases the welding process and is not conducive to the simplification and automation of the battery assembly process. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the problem that in the existing cylindrical battery assembly process, the positive nickel sheet, the negative nickel sheet and the plug wire need to be welded to the circuit board separately, which increases the welding process, a cylindrical battery structure is provided.

[0005] In order to solve the above technical problems, the embodiment of the utility model provides a cylindrical battery structure, including a sleeve, a battery cell and a composite circuit board, wherein the sleeve is sleeved outside the battery cell, the composite circuit board is located between the sleeve and the battery cell, and the composite circuit board is formed by integrally forming a rigid circuit board, a flexible circuit board, a connector, a positive nickel sheet and a negative nickel sheet, the rigid circuit board is fixed to the radial outer side of the battery cell, and a plurality of components are installed on the side of the rigid circuit board facing away from the battery cell;

[0006] The rigid circuit board has a first end and a second end which are arranged opposite to each other along the axial direction of the battery cell. The flexible circuit board and the positive nickel sheet are both integrally formed at the first end of the rigid circuit board, and the negative nickel sheet is integrally formed at the second end of the rigid circuit board. The positive nickel sheet is welded to the positive electrode of the battery cell, and the negative nickel sheet is welded to the negative electrode of the battery cell. The connector is integrally formed at one end of the flexible circuit board away from the rigid circuit board and extends outwardly from the sleeve.

[0007] Optionally, the rigid circuit board is in the shape of an elongated strip and extends along the axial direction of the battery core, and the plurality of components are mounted on the rigid circuit board along the axial direction of the battery core.

[0008] Optionally, the length of the rigid circuit board is smaller than the height of the battery core.

[0009] Optionally, in the axial direction of the battery cell, the rigid circuit board is centrally arranged; the positive electrode nickel sheet comprises a positive electrode axial section and a positive electrode radial section, the positive electrode axial section extends along the axial direction of the battery cell, one end of the positive electrode axial section is integrally formed on the rigid circuit board, and the other end is bent radially inwardly of the battery cell to form the positive electrode radial section, and the positive electrode radial section is welded to the positive electrode of the battery cell;

[0010] The negative electrode nickel sheet comprises a negative electrode axial section and a negative electrode radial section, the negative electrode axial section extends along the axial direction of the battery cell, one end of the negative electrode axial section is integrally formed on the rigid circuit board, and the other end is bent radially inwardly of the battery cell to form the negative electrode radial section, and the negative electrode radial section is welded to the negative electrode of the battery cell;

[0011] The flexible circuit board includes a first axial section and a connecting section, the first axial section extends along the axial direction of the battery cell, one end of the first axial section is integrally formed on the rigid circuit board, and the other end is connected to the connecting section, and the connector is integrally formed on the connecting section.

[0012] Optionally, the connecting section includes a first radial section and a second axial section, the first radial section extends radially along the battery cell, the second axial section extends axially along the battery cell, the first axial section is bent radially inwardly of the battery cell to form the first radial section, the radial inner end of the first radial section is bent away from the first axial section to form the second axial section, and the connector is integrally formed on the side of the second axial section toward the center of the battery cell.

[0013] Optionally, a protective sheet is further included, wherein the protective sheet is attached to the battery cell on both sides of the battery cell in the circumferential direction and covers the outer side of the rigid circuit board, so as to protect components on the rigid circuit board;

[0014] The protection sheet is provided with two cuts spaced apart along the circumferential direction of the battery core, the cut marks of the cuts are in the shape of dotted lines, and the cuts include a plurality of removed sections spaced apart along the axial direction of the battery core.

[0015] Optionally, the protective sheet is provided with a plurality of notches on both side edges in the circumferential direction of the battery core, the plurality of notches are spaced apart along the axial direction of the battery core, and the notches extend along the circumferential direction of the battery core and extend to adjacent incisions.

[0016] Optionally, the notches on both sides of the protective sheet correspond one to one in the circumferential direction of the battery core.

[0017] Optionally, a magnet is disposed on the outer circumference of the sleeve, and the magnet is used for magnetic attraction and fixation of the cylindrical battery structure.

[0018] Optionally, the welding area of ​​the positive nickel sheet is provided with a first groove penetrating through the two side surfaces in the thickness direction thereof, and the welding area of ​​the negative nickel sheet is provided with a second groove penetrating through the two side surfaces in the thickness direction thereof.

[0019] In the cylindrical battery structure of the utility model, the positive nickel sheet and the negative nickel sheet are respectively integrally formed on the first end and the second end of the rigid circuit board, the connector is integrally formed on the flexible circuit board, and the flexible circuit board is integrally formed on the rigid circuit board. Therefore, when assembling the cylindrical battery structure, the composite circuit board and the battery cell can be directly assembled, avoiding the situation in which the positive nickel sheet, the negative nickel sheet and the connector are respectively welded on the circuit board during the assembly of the cylindrical battery structure, which increases the welding process and is not conducive to full automation. The assembly process and the welding process are simplified, which is conducive to the full automation of the cylindrical battery structure and improves the product production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a cylindrical battery structure provided by an embodiment of the utility model;

[0021] Figure 2 yes Figure 1 Exploded diagram of

[0022] Figure 3 yes Figure 2 Schematic diagram of the structure of the composite circuit board;

[0023] Figure 4 yes Figure 2 A schematic diagram of the structure of the composite circuit board when it is assembled on the battery cell;

[0024] Figure 5 yes Figure 4 A structural diagram from another perspective;

[0025] Figure 6 yes Figure 2 A schematic diagram of the structure of the protective sheet in FIG.

[0026] Figure 7 yes Figure 2 A schematic diagram of the structure when the protective sheet is pasted on the battery cell;

[0027] Figure 8 yes Figure 2 A schematic diagram of the structure when the sleeve is sleeved outside the battery core;

[0028] The reference numerals in the specification are as follows:

[0029] 1. Casing; 2. Battery cell; 3. Composite circuit board; 31. Rigid circuit board; 32. Flexible circuit board; 321. First axial section; 322. First radial section; 33. Connector; 34. Positive nickel sheet; 341. First slot; 35. Negative nickel sheet; 351. Second slot; 4. Protective sheet; 41. Incision; 42. Notch; 5. First insulating sheet; 6. Second insulating sheet; 7. EVA sponge; 8. Magnet; 9. Label; 10. Label paper. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0031] like Figure 1 and Figure 2 As shown, an embodiment of the utility model provides a cylindrical battery, including a sleeve 1, a battery cell 2 and a composite circuit board 3, wherein the sleeve 1 is sleeved outside the battery cell 2, and the composite circuit board 3 is fixed between the sleeve 1 and the battery cell 2. The composite circuit board 3 is formed by integrally forming a rigid circuit board 31, a flexible circuit board 32, a connector 33, a positive nickel sheet 34 and a negative nickel sheet 35.

[0032] The rigid circuit board 31 is located radially outside the battery cell 2. Multiple components are installed on the side of the rigid circuit board 31 facing away from the battery cell 2. The protection circuit composed of multiple components can realize the protection functions of overcharging, over-discharging, over-current, over-temperature, short circuit, etc. for the battery pack.

[0033] like Figure 3 As shown, the rigid circuit board 31 has a first end and a second end that are oppositely arranged along the axial direction of the battery cell 2, the flexible circuit board 32 and the positive nickel sheet 34 are both integrally formed at the first end of the rigid circuit board 31, and the negative nickel sheet 35 is integrally formed at the second end of the rigid circuit board 31. The positive nickel sheet 34 is welded to the positive electrode of the battery cell 2, the negative nickel sheet 35 is welded to the negative electrode of the battery cell 2, and the connector 33 is integrally formed at one end of the flexible circuit board 32 away from the rigid circuit board 31 and extends outward from the sleeve 1.

[0034] The rigid circuit board 31, the flexible circuit board 32, the connector 33, the positive nickel sheet 34 and the negative nickel sheet 35 are integrally formed to form a composite circuit board 3, so that the composite circuit board 3 has certain structural strength and flexibility. The composite circuit board 3 can be arranged on the radial outside of the battery cell 2 and support the positive nickel sheet 34, the negative nickel sheet 35 and components to maintain a fixed shape, so that the sleeve 1 can be sleeved on the outside of the battery cell 2 and the composite circuit board 3 through automated equipment.

[0035] Moreover, the one-piece composite circuit board 3 can avoid the situation in which the positive nickel sheet 34, the negative nickel sheet 35 and the connector 33 are separately welded on the circuit board during the assembly of the cylindrical battery structure, which increases the welding process and is not conducive to full automation. It simplifies the assembly process and welding process, is conducive to the full automation of the cylindrical battery structure, and improves product production efficiency.

[0036] According to the common knowledge in the field of battery manufacturing technology, the cap of the battery cell 2 is the positive electrode of the battery cell 2, and the steel shell of the battery cell 2 is the negative electrode of the battery cell 2. Therefore, the contact portion between the battery cell 2 and the composite circuit board 3 and the exposed portion of the battery cell 2 need to be provided with an insulating component, such as an insulating sheet.

[0037] When assembling the cylindrical battery structure of the utility model, the assembly sequence is as follows:

[0038] First, as Figure 2 and Figure 4 As shown, the first insulating sheet 5 is pasted on the side of the battery cell 2. Note that the top of the first insulating sheet 5 should be bent to a certain length and pasted on the positive end of the battery cell 2, but not covering the cap. The bottom of the first insulating sheet 5 is flush with the negative end of the battery cell 2. The pasting effect is as shown in FIG. Figure 4 shown.

[0039] Second, if Figure 4 and Figure 5 As shown, the battery cell 2 and the composite circuit board 3 are respectively placed in a fixture for positioning and fixing, the composite circuit board 3 is arranged corresponding to the first insulating sheet 5, the positive nickel sheet 34 is arranged corresponding to the positive end of the battery cell 2, and the negative nickel sheet 35 is arranged corresponding to the negative end of the battery cell 2. The automatic spot welding equipment simultaneously welds the positive nickel sheet 34 to the positive electrode of the battery cell 2 and welds the negative nickel sheet 35 to the negative electrode of the battery cell 2.

[0040] Third, if Figure 2 As shown, a second insulating sheet 6 is pasted on the positive terminal and the negative terminal of the battery cell 2 to insulate the positive terminal and the negative terminal of the battery cell 2, thereby obtaining a semi-finished battery pack.

[0041] Fourth, if Figure 8 As shown, the sleeve 1 is inserted into the semi-finished battery pack, the connector 33 extends out of the sleeve 1, and is put into the furnace, and the sleeve 1 shrinks to fix the semi-finished battery pack; an automatic labeling device is used to stick the label 9 in the center of the surface of the sleeve 1, and the EVA sponge 7 is stuck on both ends of the semi-finished battery pack to assist in fixing the semi-finished battery pack.

[0042] The above-mentioned assembly processes can all be automated and do not require manual assembly.

[0043] In the cylindrical battery structure of the utility model, the positive nickel sheet 34 and the negative nickel sheet 35 are respectively integrally formed at the first end and the second end of the rigid circuit board 31, the connector 33 is integrally formed on the flexible circuit board 32, and the flexible circuit board 32 is integrally formed on the rigid circuit board 31. Therefore, when assembling the cylindrical battery structure, the composite circuit board 3 and the battery cell 2 can be directly assembled, avoiding the situation in which the positive nickel sheet 34, the negative nickel sheet 35 and the connector 33 are respectively welded on the circuit board during the assembly of the cylindrical battery structure, which increases the welding process and is not conducive to full automation. The assembly process and the welding process are simplified, which is conducive to the full automation of the cylindrical battery structure and improves the product production efficiency.

[0044] In one embodiment, an insulating sheet is pasted between the positive nickel sheet 34 and the flexible circuit board 32 to achieve insulation between the positive nickel sheet 34 and the flexible circuit board 32 .

[0045] In one embodiment, if Figure 3 As shown, the rigid circuit board 31 is in a long strip shape and extends along the axial direction of the battery cell 2. Multiple components are mounted on the rigid circuit board 31 along the axial direction of the battery cell 2. On the premise that the rigid circuit board 31 can be used to mount components, the size of the rigid circuit board 31 is reduced to save materials and reduce costs.

[0046] In one embodiment, the length of the rigid circuit board 31 is smaller than the height of the battery cell 2 , so as to further reduce the size of the rigid circuit board 31 , save materials, and reduce costs.

[0047] In one embodiment, if Figure 3 As shown, in the axial direction of the battery cell 2 , the rigid circuit board 31 is centrally arranged, and the first end and the second end of the rigid circuit board 31 are respectively at a certain distance from the two end surfaces of the battery cell 2 .

[0048] The positive electrode nickel sheet 34 includes a positive electrode axial section and a positive electrode radial section. The positive electrode axial section extends along the axial direction of the battery cell 2. One end of the positive electrode axial section is integrally formed on the rigid circuit board 31, and the other end is bent radially inwardly of the battery cell 2 to form a positive electrode radial section. The positive electrode radial section is welded to the positive electrode of the battery cell 2.

[0049] The negative electrode nickel sheet 35 includes a negative electrode axial section and a negative electrode radial section. The negative electrode axial section extends along the axial direction of the battery cell 2. One end of the negative electrode axial section is integrally formed on the rigid circuit board 31, and the other end is bent radially inwardly of the battery cell 2 to form a negative electrode radial section. The negative electrode radial section is welded to the negative electrode of the battery cell 2.

[0050] The flexible circuit board 32 includes a first axial section 321 and a connecting section. The first axial section 321 extends along the axial direction of the battery cell 2. One end of the first axial section 321 is integrally formed on the rigid circuit board 31, and the other end is connected to the connecting section. The connector 33 is integrally formed on the connecting section.

[0051] In one embodiment, if Figure 3 As shown, the connecting section includes a first radial section 322 and a second axial section, the first radial section 322 extends radially of the battery cell 2, the second axial section extends axially of the battery cell 2, the first axial section 321 is bent radially inwardly of the battery cell 2 to form the first radial section 322, the radial inner end of the first radial section 322 is bent in a direction away from the first axial section 321 to form the second axial section, and the connector 33 is integrally formed on the side of the second axial section facing the center of the battery cell 2.

[0052] In one embodiment, if Figure 6 and Figure 7 As shown, the protective sheet 4 is also included, which is attached to the battery cell 2 on both sides of the circumference of the battery cell 2 and covers the outer side of the rigid circuit board 31, and is used to protect the components on the rigid circuit board 31. Compared with attaching an insulating sheet on the components, the protective sheet 4 has a certain structural strength, can better protect the components, and prevent the components from being damaged due to bumps.

[0053] The protective sheet 4 is provided with two cutouts 41 spaced apart along the circumferential direction of the battery cell 2, the cutouts 41 are in the shape of dotted lines, and the cutouts 41 include a plurality of removed sections spaced apart along the axial direction of the battery cell 2. The protective sheet 4 needs to be bent at both sides to be attached to the battery cell 2, and the provision of the cutouts 41 can effectively reduce the stress generated by the bending of the protective sheet 4, and prevent the protective sheet 4 from warping, falling off, and other undesirable conditions due to the bending stress after being attached to the battery cell 2.

[0054] When assembling the cylindrical battery structure, before the sleeve 1 is installed, the protective sheet 4 is bent at the two cuts 41, and then the protective sheet 4 is pasted on the outer wall of the battery core 2 and covers the outside of the components.

[0055] In one embodiment, if Figure 6 As shown, the protective sheet 4 is provided with a plurality of notches 42 on both side edges in the circumferential direction of the battery cell 2. The plurality of notches 42 are spaced apart along the axial direction of the battery cell 2, and the notches 42 extend along the circumferential direction of the battery cell 2 and extend to the adjacent notches 41. Due to the inconsistent heights of the components on the rigid circuit board 31, when the protective sheet 4 is directly attached to the outside of the components, the two side edges of the protective sheet 4 are prone to overlap and wrinkles. The notches 42 divide the two side edges of the protective sheet 4 into multiple sections, avoiding the situation where the side edges of the protective sheet 4 corresponding to the height of the components are prone to wrinkles, thereby improving the appearance quality of the product.

[0056] In one embodiment, the notches 42 on both sides of the protection sheet 4 correspond one to one in the circumferential direction of the battery core 2 .

[0057] In one embodiment, two notches 42 are respectively disposed on the two side edges of the protection sheet 4 , and the notches 42 on the two sides correspond to each other in the circumferential direction of the battery cell 2 .

[0058] In one embodiment, the welding area of ​​the positive nickel sheet 34 is provided with a first groove 341 penetrating through both side surfaces in the thickness direction thereof, and the welding area of ​​the negative nickel sheet 35 is provided with a second groove 351 penetrating through both side surfaces in the thickness direction thereof.

[0059] According to the principle of resistance spot welding, the heat generated during spot welding is given by the formula Q = I 2 Rt is determined by, where Q refers to the heat generated by welding (J), I 2 It refers to the square of the welding current (A), R refers to the resistance between electrodes (Ω), and t refers to the welding time (s). The welding area of ​​the positive nickel sheet 34 is provided with a first slot 341, and the welding area of ​​the negative nickel sheet 35 is provided with a second slot 351, which can increase the resistance R between the electrodes and increase the welding heat Q, so that the strength of the molten core formed at the welding point of the nickel sheet and the battery cell 2 is high. Compared with the nickel sheet without slots, the welding strength is high and the welding stability is good. The battery pack performs better in safety performance tests, especially in drop tests, vibration tests, and roller tests.

[0060] In one embodiment, if Figure 1 and Figure 2 As shown, the battery cell 2 in the cylindrical battery structure is a cylindrical steel shell battery cell 2, and an appropriate number and specific shape of magnets 8 are arranged on the outer periphery of the sleeve 1. Based on the physical properties of the cylindrical steel shell battery cell 2, the battery cell 2 can be attracted by the magnet 8, so the device can secure the cylindrical battery structure on the device by magnetically attracting the magnet 8. Compared with traditional double-sided adhesive or gluing fixation, which is easy to damage the battery itself and the device structure during the disassembly process and is not removable, fixing with magnets 8 can achieve both removability and non-destructiveness without destroying the overall structure of the battery, thereby improving the product experience.

[0061] In one embodiment, four magnets 8 are provided, and the four magnets 8 are fixed on the sleeve 1 at intervals along the circumferential direction of the sleeve 1. The magnet 8 is in the shape of a triangular prism, and the outer wall of the magnet 8 includes a first plane, a second plane, and an arc surface connecting the first plane and the second plane. The radius of the arc surface is the same as the radius of the outer wall of the sleeve 1, so that the arc surface can fit the outer wall of the sleeve 1.

[0062] In one embodiment, an appropriate number of label papers 10 are pasted on the outer wall of the sleeve 1. The label paper 10 turns red when exposed to water, and monitors whether the waterproof and moisture-proof products used in waterproof products and moisture-proof environments have failed. Characteristics of label paper that turns red when exposed to water: It is not easy to tear. When exposed to water, it will quickly change from white to red, and after drying, the red color cannot be restored. Traditional battery designs usually do not include waterproof and moisture-proof monitoring functions, resulting in a lack of judgment on whether the battery has been immersed in water or damp after failure.

[0063] In other embodiments, the shape of the rigid circuit board 31 can be changed according to actual needs, for example, a diamond shape, an ellipse shape or other special shapes.

[0064] In other embodiments, the length of the rigid circuit board 31 may be the same as the height of the battery cell 2 . In this case, the positive electrode nickel sheet 34 may only include a positive electrode radial segment extending radially along the battery cell 2 , and the negative electrode nickel sheet 35 may only include a negative electrode radial segment extending radially along the battery cell 2 .

[0065] In other embodiments, the first end of the rigid circuit board 31 may be flush with the positive terminal of the battery cell 2 or the second end of the rigid circuit board 31 may be flush with the negative terminal of the battery cell 2. When the first end of the rigid circuit board 31 is flush with the positive terminal of the battery cell 2, the positive electrode nickel sheet 34 may only include a positive electrode radial segment extending in the radial direction of the battery cell 2, and the flexible circuit board 32 may only include a connecting segment extending radially inwardly of the battery cell 2. When the second end of the rigid circuit board 31 is flush with the negative terminal of the battery cell 2, the negative electrode nickel sheet 35 may only include a negative electrode radial segment extending in the radial direction of the battery cell 2.

[0066] In other embodiments, the connecting section may extend along the axial direction of the battery core 2. The connecting section may also be an inclined section inclined toward the radial inner side of the battery core 2.

[0067] In other embodiments, the notches 42 on both sides of the protection sheet 4 in the circumferential direction of the battery core 2 may be staggered.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylindrical battery structure, characterized in that: The invention comprises a sleeve (1), a battery cell (2) and a composite circuit board (3), wherein the sleeve (1) is sleeved outside the battery cell (2), the composite circuit board (3) is fixed between the sleeve (1) and the battery cell (2), the composite circuit board (3) is formed by integrally molding a rigid circuit board (31), a flexible circuit board (32), a connector (33), a positive nickel sheet (34) and a negative nickel sheet (35), the rigid circuit board (31) is located radially outside the battery cell (2), and a plurality of components are installed on a side of the rigid circuit board (31) facing away from the battery cell (2); The rigid circuit board (31) has a first end and a second end which are arranged opposite to each other along the axial direction of the battery cell (2); the flexible circuit board (32) and the positive nickel sheet (34) are both integrally formed at the first end of the rigid circuit board (31); the negative nickel sheet (35) is integrally formed at the second end of the rigid circuit board (31); the positive nickel sheet (34) is welded to the positive electrode of the battery cell (2); the negative nickel sheet (35) is welded to the negative electrode of the battery cell (2); and the connector (33) is integrally formed at one end of the flexible circuit board (32) away from the rigid circuit board (31) and extends outward from the sleeve (1).

2. The cylindrical battery structure according to claim 1, characterized in that: The rigid circuit board (31) is in the shape of an elongated strip and extends along the axial direction of the battery core (2); a plurality of components are mounted on the rigid circuit board (31) along the axial direction of the battery core (2).

3. The cylindrical battery structure according to claim 2, characterized in that: The length of the rigid circuit board (31) is smaller than the height of the battery core (2).

4. The cylindrical battery structure according to claim 3, characterized in that: In the axial direction of the battery cell (2), the rigid circuit board (31) is centrally arranged; the positive electrode nickel sheet (34) comprises a positive electrode axial section and a positive electrode radial section, the positive electrode axial section extends along the axial direction of the battery cell (2), one end of the positive electrode axial section is integrally formed on the rigid circuit board (31), and the other end is bent radially inwardly of the battery cell (2) to form the positive electrode radial section, and the positive electrode radial section is welded to the positive electrode of the battery cell (2); The negative electrode nickel sheet (35) comprises a negative electrode axial section and a negative electrode radial section, the negative electrode axial section extending along the axial direction of the battery cell (2), one end of the negative electrode axial section being integrally formed on the rigid circuit board (31), and the other end being bent radially inwardly of the battery cell (2) to form the negative electrode radial section, and the negative electrode radial section being welded to the negative electrode of the battery cell (2); The flexible circuit board (32) comprises a first axial section (321) and a connecting section, wherein the first axial section (321) extends along the axial direction of the battery cell (2), one end of the first axial section (321) is integrally formed on the rigid circuit board (31), and the other end is connected to the connecting section, and the connector (33) is integrally formed on the connecting section.

5. The cylindrical battery structure according to claim 4, characterized in that: The connecting section comprises a first radial section (322) and a second axial section, the first radial section (322) extending in the radial direction of the battery core (2), the second axial section extending in the axial direction of the battery core (2), the first axial section (321) being bent radially inwardly of the battery core (2) to form the first radial section (322), the radial inner end of the first radial section (322) being bent in a direction away from the first axial section (321) to form the second axial section, and the connector (33) being integrally formed on a side of the second axial section facing the center of the battery core (2).

6. The cylindrical battery structure according to any one of claims 1 to 5, characterized in that: It also includes a protective sheet (4), which is attached to the battery core (2) on both sides of the battery core (2) in the circumferential direction and covers the outer side of the rigid circuit board (31), and is used to protect components on the rigid circuit board (31); The protective sheet (4) is provided with two cutouts (41) spaced apart along the circumferential direction of the battery core (2); the cutouts (41) are in the form of dotted lines; and the cutouts (41) include a plurality of removed sections spaced apart along the axial direction of the battery core (2).

7. The cylindrical battery structure according to claim 6, characterized in that: The protective sheet (4) is provided with a plurality of notches (42) on both side edges in the circumferential direction of the battery core (2); the plurality of notches (42) are distributed at intervals along the axial direction of the battery core (2); and the notches (42) extend along the circumferential direction of the battery core (2) and extend to the adjacent notches (41).

8. The cylindrical battery structure according to claim 7, characterized in that: The notches (42) on both sides of the protection sheet (4) in the circumferential direction of the battery core (2) correspond one to one in the circumferential direction of the battery core (2).

9. The cylindrical battery structure according to any one of claims 1 to 5, characterized in that: A magnet (8) is arranged on the outer periphery of the sleeve (1), and the magnet (8) is used for magnetic attraction and fixation of the cylindrical battery structure.

10. The cylindrical battery structure according to any one of claims 1 to 5, characterized in that: The welding area of ​​the positive nickel sheet (34) is provided with a first groove (341) penetrating through the two side surfaces in the thickness direction thereof, and the welding area of ​​the negative nickel sheet (35) is provided with a second groove (351) penetrating through the two side surfaces in the thickness direction thereof.

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