Cylindrical battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cylindrical battery which comprises a shell, a roll core, polar plates and a connector, the shell is cylindrical, an opening is formed in one end of the shell in the axial direction of the shell, and the part, located on the edge of the opening, of the shell is folded towards the center side to form an annular folded edge. The roll core is arranged in the shell; the polar plate is arranged at the opening, the outer edge of the polar plate is circular and is connected with the folded edge, and the polar plate is conductively connected with the roll core through the folded edge and the shell; the connecting body is arranged on one surface of the polar plate back to the roll core and is conductively connected with the polar plate, and in the axial direction of the shell, the folding edge is positioned between one surface of the connecting body back to the roll core and one surface of the polar plate towards the roll core. In practical application, the cylindrical battery is applied to the battery pack, the busbar is welded with the surface, back to the roll core, of the connecting body, and the folded edge is positioned between the surface, back to the roll core, of the connecting body and the surface, facing the roll core, of the polar plate, so that the folded edge cannot jack up the busbar, and the electric connection reliability of the cylindrical battery is high.

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 related art, the positive electrode and the negative electrode of a cylindrical battery are located at the same end. Among them, the positive terminal is plate-shaped, and the negative terminal is column-shaped. The positive electrode of the winding core of the cylindrical battery is electrically connected to the positive terminal through the shell and the folded edge of the shell. The negative electrode of the winding core is electrically connected to the negative terminal. In practical applications, when this kind of cylindrical battery is applied to a battery pack, the positive electrodes and negative electrodes of multiple cylindrical batteries need to be connected to a busbar. However, in the production of cylindrical batteries, it is difficult to ensure that the folded edge is completely flush with the plate-shaped positive electrode. Therefore, after the busbar is connected to the positive electrode, the folded edge will push up the busbar, which results in poor contact between the positive electrode and the busbar and low electrical connection reliability of the cylindrical battery. Summary of the Utility Model

[0003] The purpose of the utility model is to propose a cylindrical battery, which has high electrical connection reliability when applied to a battery pack.

[0004] To achieve the above purpose, the utility model provides a cylindrical battery, which includes a shell, a winding core, a pole plate and a connecting body;

[0005] The shell is cylindrical, one end of the shell along its axial direction is provided with an opening, and a part of the shell at the edge of the opening is turned over towards the center to form an annular folded edge;

[0006] The winding core is arranged inside the shell;

[0007] The pole plate is arranged at the opening, the outer edge of the pole plate is circular, the outer edge of the pole plate is connected to the folded edge, and the pole plate is electrically connected to the winding core through the folded edge and the shell;

[0008] The connecting body is arranged on the side of the pole plate facing away from the winding core, and the connecting body is electrically connected to the pole plate. In the axial direction of the shell, the folded edge is located between the side of the connecting body facing away from the winding core and the side of the pole plate facing the winding core.

[0009] In a specific embodiment of the utility model, an annular avoidance groove is arranged at the edge of the side of the pole plate facing away from the winding core, and the folded edge extends into the avoidance groove.

[0010] In a specific embodiment of the utility model, the pole plate is provided with a through hole penetrating along the axial direction of the shell;

[0011] The cylindrical battery further includes a pole column and an insulating member;

[0012] The pole post is disposed at the opening and passes through the through hole, and the pole post is electrically connected to the winding core;

[0013] The insulating member is disposed at the opening, and at least a part of the insulating member is located between the plate electrode and the pole post to insulate the plate electrode from the pole post.

[0014] In a specific embodiment of the present invention, the insulating member seals the opening. A first mounting groove and a second mounting groove are provided on a surface of the insulating member facing away from the winding core. The first mounting groove is annular, and the second mounting groove is located inside the first mounting groove. The insulating member is further provided with a first mounting hole that penetrates from the bottom surface of the second mounting groove to the surface of the insulating member facing the winding core;

[0015] The plate electrode is embedded in the first mounting groove, the pole post is embedded in the second mounting groove, and a part of the pole post passes through the first mounting hole and extends into the housing and is electrically connected to the winding core.

[0016] In a specific embodiment of the present invention, a position of the outer peripheral wall of the housing near the opening is deflected toward the inside of the housing, a first annular groove surrounding its axis is formed on the outer peripheral wall of the housing, and a first annular convex portion corresponding to the first annular groove is formed on the inner peripheral wall of the housing;

[0017] The material of the insulating member is rubber. The housing defines the insulating member into a cylinder, and the first annular convex portion compresses the outer peripheral wall of the insulating member so that a second annular groove is formed on the outer peripheral wall of the insulating member around its axis.

[0018] In a specific embodiment of the present invention, a part of the surface of the plate electrode facing the winding core is recessed to form a first groove body, and a part of the surface of the plate electrode facing away from the winding core is protruded to form the connecting body corresponding to the first groove body.

[0019] In a specific embodiment of the present invention, the insulating member has a convex platform portion, and the convex platform portion is located on the bottom surface of the first mounting groove;

[0020] The convex platform portion is embedded in the first groove body.

[0021] In a specific embodiment of the present invention, the plate electrode is provided with an avoidance hole penetrating along the axial direction of the housing;

[0022] The insulating member has a liquid injection protrusion located on the bottom surface of the first installation groove. The liquid injection protrusion is provided with a second installation hole that penetrates from the side of the liquid injection protrusion facing away from the core to the side of the insulating member facing the core. The liquid injection protrusion passes through the avoidance hole;

[0023] The cylindrical battery further includes a sealing nail that is sealingly inserted into the second installation hole.

[0024] In a specific embodiment of the present invention, the avoidance hole and the connecting body are respectively located on opposite sides of the through hole.

[0025] In a specific embodiment of the present invention, the insulating member has a second annular protrusion provided on the side surface of the first installation groove away from its center and arranged around the axis of the insulating member;

[0026] The electrode plate has a third annular protrusion provided on the outer peripheral wall of the electrode plate and arranged around its axis;

[0027] Wherein, one side of the second annular protrusion facing away from the bottom surface of the first installation groove abuts against the folded edge, and one side of the second annular protrusion facing the bottom surface of the first installation groove abuts against the side surface of the third annular protrusion facing away from the core.

[0028] Compared with the prior art, the beneficial effects of the cylindrical battery according to the embodiment of the present invention are as follows:

[0029] In the cylindrical battery according to the embodiment of the present invention, the electrode plate is arranged at the opening and is electrically connected to the core through the folded edge and the housing. The connecting body is arranged on the electrode plate and is electrically connected to the electrode plate. In practical applications, the cylindrical battery is applied to a battery pack, and the bus bar is welded to the side of the connecting body facing away from the core. Since the folded edge is located between the side of the connecting body facing away from the core and the side of the electrode plate facing the core, the folded edge will not lift the bus bar, and the welding reliability between the electrode plate and the bus bar is high, and there will be no phenomenon of poor contact. Therefore, when the cylindrical battery is applied to a battery pack, its electrical connection reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a three-dimensional structural diagram of the cylindrical battery according to the embodiment of the present invention;

[0031] Figure 2 is a cross-sectional structural diagram of the cylindrical battery according to the embodiment of the present invention;

[0032] Figure 3 is an enlarged schematic diagram of A in the embodiment of the present invention Figure 2 ;

[0033] Figure 4 is an enlarged schematic view of B in the embodiment of the present utility model; Figure 3 in the embodiment of the present utility model;

[0034] Figure 5 is an enlarged schematic view of C in the embodiment of the present utility model; Figure 3 in the embodiment of the present utility model;

[0035] Figure 6 is a three-dimensional structure diagram of the electrode plate in the embodiment of the present utility model;

[0036] Figure 7 is a three-dimensional structure diagram of the electrode plate from another angle in the embodiment of the present utility model;

[0037] Figure 8 is a three-dimensional structure diagram of the insulating part in the embodiment of the present utility model;

[0038] Figure 9 is a top view structure diagram of the insulating part in the embodiment of the present utility model.

[0039] In the figure, 1 is the housing; 101 is the opening; 102 is the first annular groove; 11 is the folded edge; 12 is the first annular protrusion; 2 is the winding core; 3 is the electrode plate; 301 is the avoidance groove; 302 is the through hole; 303 is the first groove body; 304 is the avoidance hole; 31 is the third annular protrusion; 4 is the connecting body; 5 is the pole column; 6 is the insulating part; 601 is the first installation groove; 602 is the second installation groove; 603 is the first installation hole; 604 is the second annular groove; 61 is the convex platform part; 62 is the liquid injection protrusion; 621 is the second installation hole; 63 is the second annular protrusion; 7 is the sealing nail. Specific embodiments

[0040] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0041] As Figures 1 to 9 shown, a cylindrical battery in the embodiment of the present utility model includes a housing 1, a winding core 2, an electrode plate 3 and a connecting body 4; the housing 1 is cylindrical, one end of the housing 1 along its axial direction is provided with an opening 101, and a part of the housing 1 at the edge of the opening 101 is turned over towards the center to form an annular folded edge 11; the winding core 2 is arranged in the housing 1; the electrode plate 3 is arranged at the opening 101, the outer edge of the electrode plate 3 is circular, the outer edge of the electrode plate 3 is connected to the folded edge 11, and the electrode plate 3 is electrically connected to the winding core 2 through the folded edge 11 and the housing 1; the connecting body 4 is arranged on the surface of the electrode plate 3 facing away from the winding core 2, and in the axial direction of the housing 1, the folded edge 11 is located between the surface of the connecting body 4 facing away from the winding core 2 and the surface of the electrode plate 3 facing the winding core 2.

[0042] In practical applications, cylindrical batteries are used in battery packs. The busbar is welded to the side of the connecting body 4 facing away from the core 2. Since the folded edge 11 is located between the side of the connecting body 4 facing away from the core 2 and the side of the electrode plate 3 facing the core 2, the folded edge 11 will not lift the busbar. The welding reliability between the electrode plate 3 and the busbar is high, and there will be no poor contact phenomenon. Therefore, when the cylindrical battery is used in a battery pack, its electrical connection reliability is high.

[0043] Furthermore, as Figure 5 and Figure 6 shown, an annular avoidance groove 301 is provided at the edge of the side of the electrode plate 3 facing away from the core 2, and the folded edge 11 extends into the avoidance groove 301. Thus, the distance between the folded edge 11 and the side of the connecting body 4 facing away from the core 2 is relatively far, which can further prevent the folded edge 11 from lifting the busbar and ensure the welding reliability between the electrode plate 3 and the busbar; in addition, the side of the folded edge 11 facing the core 2 contacts the bottom surface of the avoidance groove 301. Thus, the electrical connection reliability between the folded edge 11 and the electrode plate 3 is also relatively high; optionally, the folded edge 11 is connected to the electrode plate 3 by welding.

[0044] In this embodiment, as Figure 6 shown, the electrode plate 3 is provided with a through hole 302 axially penetrating the housing 1; the cylindrical battery further includes a terminal 5 and an insulating member 6; the terminal 5 is disposed at the opening 101 and passes through the through hole 302, and the terminal 5 is electrically connected to the core 2; the insulating member 6 is disposed at the opening 101, and at least part of the insulating member 6 is located between the electrode plate 3 and the terminal 5 to insulate between the electrode plate 3 and the terminal 5. As a specific implementation of this embodiment, the housing 1 is an aluminum shell, the electrode plate 3 is electrically connected to the positive electrode of the core 2 through the housing 1 and the folded edge 11, and the terminal 5 is electrically connected to the negative electrode of the core 2. For the cylindrical battery with such a structure, its positive and negative electrodes are both located at the same end. When it is used in a battery pack, the busbar connecting the positive and negative electrodes of the cylindrical battery can be arranged on the same side of the cylindrical battery, which is beneficial to the wiring of the busbar.

[0045] Furthermore, as Figure 3 shown, the insulating member 6 seals the opening 101. The side of the insulating member 6 facing away from the core 2 is provided with a first mounting groove 601 and a second mounting groove 602. The first mounting groove 601 is annular, and the second mounting groove 602 is located inside the first mounting groove 601. The insulating member 6 is further provided with a first mounting hole 603, and the first mounting hole 603 penetrates from the bottom surface of the second mounting groove 602 to the side of the insulating member 6 facing the core 2; the electrode plate 3 is embedded in the first mounting groove 601, the terminal 5 is embedded in the second mounting groove 602, and part of the terminal 5 passes through the first mounting hole 603 and extends into the housing 1 and is electrically connected to the core 2. Specifically, both the electrode plate 3 and the terminal 5 are mounted on the insulating member 6, and there is no need to additionally provide other insulating structures between the two to achieve insulation, which can simplify the structure of the cylindrical battery and also improve the assembly efficiency of the cylindrical battery.

[0046] As shown Figure 3 in the figure, the outer peripheral wall of the housing 1 near the opening 101 is bent inwardly towards the inside of the housing 1, and a first annular groove 102 surrounding its axis is formed on the outer peripheral wall of the housing 1, and a first annular protrusion 12 corresponding to the first annular groove 102 is formed on the inner peripheral wall of the housing 1; the insulating member 6 is made of rubber, the housing 1 defines the insulating member 6 into a cylinder, and the first annular protrusion 12 compresses the outer peripheral wall of the insulating member 6, so that the outer peripheral wall of the insulating member 6 forms a second annular groove 604 arranged around its axis. Specifically, the housing 1 is processed by a roll groove process to form the first annular groove 102, and while the first annular groove 102 is formed, the inner peripheral wall of the housing 1 protrudes and forms the first annular protrusion 12. While the first annular protrusion 12 is formed, the outer peripheral wall of the insulating member 6 is concave and forms the second annular groove 604. In this way, the insulating member 6 is arranged in the housing 1, the structure is simple, the processing is convenient, the insulating member 6 is stably arranged, and a sealing part is formed between the outer peripheral wall of the insulating member 6 and the inner wall of the housing 1, and there is a certain degree of sealing between the two to meet the sealing requirements for the normal use of the cylindrical battery.

[0047] During the processing of the battery, the insulating member 6 is first arranged in the housing 1, and then the housing 1 is processed to form the first annular groove 102 and the folded edge 11 successively or simultaneously. The first annular groove 102 and the folded edge 11 will squeeze the insulating member 6 during the forming process. Since the insulating member 6 is made of rubber, after the insulating member 6 is compressed and deformed, it will tend to elastically recover. Based on this trend, the side of the insulating member 6 facing away from the winding core 2 will closely adhere to the folded edge 11, and the outer peripheral wall of the insulating seat will closely adhere to the inner peripheral wall of the housing 1. Based on this, the cylindrical battery has the characteristic of good sealing effect.

[0048] In this embodiment, as shown Figure 3 in Figure 4 figures Figure 6 and Figure 7 below, a part of the surface of the electrode plate 3 facing the winding core 2 is recessed to form a first groove body 303, and a part of the surface of the electrode plate 3 facing away from the winding core 2 is protruded to form a connecting body 4 corresponding to the first groove body 303. That is, the electrode plate 3 and the connecting body 4 are of an integral structure. In practical applications, the above-mentioned connecting body 4 is formed by stamping the electrode plate 3, thereby forming the first groove body 303. Specifically, the electrode plate 3 and the connecting body 4 are processed by a stamping process, the process is simple, the processing is convenient and the cost is low. The cylindrical battery has the characteristics of low processing difficulty and low processing cost.

[0049] Since the insulating member 6 is installed in the housing 1 through the roll groove process, during the roll groove process of the housing 1, when the insulating member 6 is under pressure, the portion of the insulating member 6 corresponding to the first groove 303 will deform and be squeezed into the first groove 303. This phenomenon will cause the outer peripheral wall of the insulating member 6 not to fit well with the inner wall of the housing 1. Therefore, the sealing performance of the cylindrical battery will be affected. Based on this, in this embodiment, as Figure 8 and Figure 9 shown, the insulating member 6 has a boss portion 61, and the boss portion 61 is located on the bottom surface of the first installation groove 601; as Figure 4 shown, the boss portion 61 is embedded in the first groove 303, that is, the boss portion 61 fills the first groove 303. Therefore, during the roll groove process of the housing 1, when the insulating member 6 is under pressure, the degree of deformation of the portion of the insulating member 6 corresponding to the first groove 303 is relatively small, and the outer peripheral wall of the insulating member 6 can fit well with the inner wall of the housing 1. Based on this, the cylindrical battery has the characteristic of good sealing performance.

[0050] Furthermore, as Figure 6 shown, the electrode plate 3 is provided with an avoidance hole 304 penetrating along the axial direction of the housing 1; as Figure 8 shown, the insulating member 6 has a liquid injection boss portion 62, and the liquid injection boss portion 62 is located on the bottom surface of the first installation groove 601. The liquid injection boss portion 62 is provided with a second installation hole 621, and the second installation hole 621 penetrates from the side of the liquid injection boss portion 62 facing away from the winding core 2 to the side of the insulating member 6 facing the winding core 2. As Figure 3 shown, the liquid injection boss portion 62 passes through the avoidance hole 304; the cylindrical battery further includes a sealing nail 7, and the sealing nail 7 is hermetically inserted into the second installation hole 621. Specifically, in practical applications, the second installation hole 621 is used for injecting electrolyte into the housing 1, and the function of the sealing nail 7 is to seal the second installation hole 621 after the battery is filled with liquid. Based on the rubber material of the insulating member 6, the sealing nail 7 can be hermetically connected to the second installation hole 621 by an interference fit, with good sealing effect. At the same time, the sealing nail 7 can be inserted and pulled out multiple times, simplifying the manufacturing process. The battery does not require a dehumidification environment during storage and formation after liquid injection, greatly reducing energy consumption. Moreover, compared with the prior art, there is no need to additionally provide a sealing structure between the sealing nail 7 and the second installation hole 621, simplifying the structure of the cylindrical battery and improving the battery assembly efficiency. At the same time, the interference fit between the sealing nail 7 and the second installation hole 621 has a certain strength and has the function of an explosion-proof valve. When the air pressure in the housing 1 rises to a certain level, the sealing nail 7 can be pushed open to relieve pressure. Compared with the prior art, the cylindrical battery of the present application does not require a separate explosion-proof valve, which can further simplify the structure of the cylindrical battery and improve the assembly efficiency of the cylindrical battery. Specifically, the diameter of the sealing nail 7 is larger than the diameter of the second installation hole 621 to achieve an interference fit when the two are connected.

[0051] As a preference of this embodiment, as Figure 6 shown, the avoidance hole 304 communicates with the through hole 302, reducing the occupied space of the avoidance hole 304 and facilitating processing, and the structure of the electrode plate 3 can be more compact.

[0052] Optionally, as Figure 6 shown, the avoidance hole 304 and the connecting body 4 are respectively located on opposite sides of the through hole 302. Thus, the sealing nail 7 will not interfere with the welding of the bus bar and the connecting body 4, facilitating the assembly of the cylindrical battery into the battery pack.

[0053] In this embodiment, as Figure 5 and Figure 6 shown, the insulating member 6 has a second annular protrusion 63. The second annular protrusion 63 is provided on the groove side surface of the first mounting groove 601 away from its center and is arranged around the axis of the insulating member 6; the electrode plate 3 has a third annular protrusion 31. The third annular protrusion 31 is provided on the outer peripheral wall of the electrode plate 3 and is arranged around its axis; wherein, one side of the second annular protrusion 63 facing away from the bottom surface of the first mounting groove 601 abuts against the folded edge 11, and one side of the second annular protrusion 63 facing the bottom surface of the first mounting groove 601 abuts against the side surface of the third annular protrusion 31 facing away from the winding core 2. Specifically, the folded edge 11 presses the second annular protrusion 63 against the third annular protrusion 31, enabling the electrode plate 3 to be stably arranged on the insulating member 6, thereby making the structure of the cylindrical battery more reliable.

[0054] In this embodiment, by way of example, as Figure 6 shown, the connecting body 4 is in the shape of an arc-shaped block, and the center of the arc of the connecting body 4 is the center of the through hole 302. For the connecting body 4 with such a structure, the two ends of the side of the connecting body 4 facing away from the winding core 2 along its length direction have a relatively large span. Thus, the connecting body 4 has a large welding area, facilitating welding with the bus bar. In other embodiments, the connecting body 4 can also be in the shape of a square or other geometric shapes, and the connecting body 4 can also be arranged at other positions of the electrode plate 3. The present application places no restrictions on the shape and arrangement position of the connecting body 4.

[0055] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A cylindrical battery, characterized in that, It includes a housing (1), a core (2), a plate (3) and a connecting body (4); The housing (1) is cylindrical. One end of the housing (1) along its axis is provided with an opening (101). The part of the housing (1) at the edge of the opening (101) is turned over towards the center to form an annular flange (11); The core (2) is arranged inside the housing (1); The plate (3) is arranged at the opening (101). The outer edge of the plate (3) is circular. The outer edge of the plate (3) is connected to the flange (11). The plate (3) is electrically connected to the core (2) through the flange (11) and the housing (1); The connecting body (4) is arranged on the side of the plate (3) facing away from the core (2), and the connecting body (4) is electrically connected to the plate (3). In the axial direction of the housing (1), the flange (11) is located between the side of the connecting body (4) facing away from the core (2) and the side of the plate (3) facing the core (2).

2. The cylindrical battery according to claim 1, characterized in that, An annular avoidance groove (301) is provided at the edge of the side of the plate (3) facing away from the core (2), and the flange (11) extends into the avoidance groove (301).

3. The cylindrical battery according to claim 1, wherein The plate (3) is provided with a through hole (302) penetrating along the axis of the housing (1); The cylindrical battery further includes a terminal (5) and an insulating member (6); The terminal (5) is arranged at the opening (101) and passes through the through hole (302). The terminal (5) is electrically connected to the core (2); The insulating member (6) is arranged at the opening (101), and at least part of the insulating member (6) is located between the plate (3) and the terminal (5) to insulate the plate (3) from the terminal (5).

4. The cylindrical battery according to claim 3, characterized in that, The insulating member (6) seals the opening (101). A first mounting groove (601) and a second mounting groove (602) are provided on the side of the insulating member (6) facing away from the core (2). The first mounting groove (601) is annular. The second mounting groove (602) is located inside the first mounting groove (601). The insulating member (6) is further provided with a first mounting hole (603). The first mounting hole (603) penetrates from the bottom surface of the second mounting groove (602) to the side of the insulating member (6) facing the core (2); The plate (3) is embedded in the first mounting groove (601), the terminal (5) is embedded in the second mounting groove (602), and the terminal (5) partially passes through the first mounting hole (603) and extends into the housing (1) to be electrically connected to the core (2).

5. The cylindrical battery according to claim 4, characterized in that, The outer peripheral wall of the housing (1) near the opening (101) deflects towards the inside of the housing (1), forming a first annular groove (102) around its axis on the outer peripheral wall of the housing (1), and a first annular convex part (12) corresponding to the first annular groove (102) is formed on the inner peripheral wall of the housing (1); The insulating member (6) is made of rubber. The housing (1) defines the insulating member (6) into a cylinder, and the first annular protrusion (12) compresses the outer peripheral wall of the insulating member (6), so that a second annular groove (604) is formed on the outer peripheral wall of the insulating member (6) and is arranged around its axis.

6. The cylindrical battery according to claim 5, characterized in that, One side of the electrode plate (3) facing the winding core (2) is partially recessed to form a first groove body (303), and one side of the electrode plate (3) facing away from the winding core (2) is partially protruded to form the connecting body (4) corresponding to the first groove body (303).

7. The cylindrical battery according to claim 6, characterized in that, The insulating member (6) has a boss portion (61), and the boss portion (61) is located on the bottom surface of the first mounting groove (601). The boss portion (61) is embedded in the first groove body (303).

8. The cylindrical battery according to claim 5, wherein, The electrode plate (3) is provided with an avoidance hole (304) axially penetrating through the housing (1). The insulating member (6) has a liquid injection protrusion (62). The liquid injection protrusion (62) is located on the bottom surface of the first mounting groove (601). The liquid injection protrusion (62) is provided with a second mounting hole (621). The second mounting hole (621) penetrates from the side of the liquid injection protrusion (62) facing away from the winding core (2) to the side of the insulating member (6) facing the winding core (2). The liquid injection protrusion (62) passes through the avoidance hole (304). The cylindrical battery further includes a sealing nail (7), and the sealing nail (7) is sealingly inserted into the second mounting hole (621).

9. The cylindrical battery according to claim 8, wherein, The avoidance hole (304) and the connecting body (4) are respectively located on opposite sides of the through hole (302).

10. The cylindrical battery according to claim 5, characterized in that, The insulating member (6) has a second annular protrusion (63). The second annular protrusion (63) is arranged on the side surface of the first mounting groove (601) far from its center and is arranged around the axis of the insulating member (6). The electrode plate (3) has a third annular protrusion (31). The third annular protrusion (31) is arranged on the outer peripheral wall of the electrode plate (3) and is arranged around its axis. Wherein, one side of the second annular protrusion (63) facing away from the bottom surface of the first mounting groove (601) abuts against the folded edge (11), and one side of the second annular protrusion (63) facing the bottom surface of the first mounting groove (601) abuts against the side surface of the third annular protrusion (31) facing away from the winding core (2).

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