Cylindrical battery central tube, cylindrical battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a cylindrical battery central tube, a cylindrical battery and electric equipment, the cylindrical battery central tube comprises a tube body, one end of the tube body is an open end, the other end of the tube body is a closed end, and the side wall of the tube body is provided with a plurality of first through holes arranged at intervals along the height direction of the tube body; in the liquid injection process, electrolyte can enter the pipe body from the open end and be blocked by the closed end, the electrolyte can be effectively and temporarily stored in the pipe body, and a high liquid level is kept in the pipe body; according to the cylindrical battery, the first through holes are formed in the tube body, so that the electrolyte in the tube body can flow out from the first through holes with different heights and infiltrates the battery cell, the upper part of the battery cell can be effectively and fully infiltrated, lithium precipitation of the battery cell in the charging and discharging process caused by insufficient infiltration of the upper part of the battery cell is prevented, and the service life of the cylindrical battery is further prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and specifically relates to a cylindrical battery center tube, a cylindrical battery and electrical equipment. Background Art

[0002] As a new type of secondary battery, lithium-ion battery has the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. It has broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.

[0003] During the injection process of cylindrical batteries, the electrolyte can more easily penetrate into the battery cell due to the presence of the center hole. However, due to gravity, the electrolyte may quickly flow through the center hole and gather at the bottom of the battery, resulting in insufficient wetting of the upper part of the battery cell. This situation may cause a lack of electrolyte in the upper part when the battery is used, resulting in the precipitation of lithium metal during the charge and discharge process, reducing the battery life and posing a safety hazard. Utility Model Content

[0004] The purpose of the utility model is to provide a central tube for a cylindrical battery in view of the deficiencies in the prior art, so as to solve the problem that during the liquid filling process of the existing cylindrical battery, due to the effect of gravity, the electrolyte may quickly flow through the central hole and gather at the bottom of the battery, resulting in insufficient wetting of the upper part of the battery cell, thereby causing lithium deposition during the charging and discharging process of the cylindrical battery.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A cylindrical battery center tube comprises a tube body, one end of the tube body is an open end, the other end of the tube body is a closed end, and along the height direction of the tube body, the side wall of the tube body has a plurality of first through holes arranged at intervals.

[0007] Preferably, a cross-sectional area of ​​the first through hole close to the closed end is smaller than a cross-sectional area of ​​the first through hole close to the open end.

[0008] Preferably, the plurality of first through holes are divided into a plurality of first through hole groups, each of the first through hole groups includes at least two first through holes, the plurality of first through hole groups are spaced apart along the height direction of the tube body, and at least two of the first through holes in each of the first through hole groups are spaced apart along the circumference of the tube body.

[0009] Preferably, a capillary structure is disposed in at least a portion of the first through holes.

[0010] Preferably, a second through hole is provided on the closed end.

[0011] Preferably, the closed end has a protruding portion partially protruding toward the inside of the tube body, the protruding portion has a hollow cavity, and the second through hole is arranged on the top wall of the protruding portion and communicated with the hollow cavity.

[0012] Preferably, along the height direction of the tube body, the side wall of the protruding portion has a plurality of third through holes arranged at intervals.

[0013] Preferably, the plurality of third through holes are divided into a plurality of third through hole groups, each of the third through hole groups includes at least two third through holes, the plurality of third through hole groups are spaced apart along the height direction of the tube body, and at least two of the third through holes in each of the third through hole groups are spaced apart along the circumferential direction of the tube body.

[0014] Preferably, a cross-sectional area of ​​the first through hole is smaller than a cross-sectional area of ​​the second through hole and / or a cross-sectional area of ​​the third through hole.

[0015] Preferably, the height of the tube body is H1, and the height of the raised portion is H2, satisfying the relationship: H2:H1=(5-7):10.

[0016] Preferably, the inner diameter of the tube body is D1, and the outer diameter of the protrusion is D2, satisfying the relationship: D2:D1=(3-8):10.

[0017] Another object of the utility model is to provide a cylindrical battery, comprising a shell, a top cover, a battery cell and the cylindrical battery center tube described in the previous text of the specification, the top cover is arranged on the opening of the shell, and a receiving cavity is formed between the top cover and the battery cell, the battery cell is arranged in the receiving cavity, the battery cell has a center hole, the cylindrical battery center tube is arranged in the center hole, the top cover is provided with a liquid injection hole, and the opening end faces the liquid injection hole.

[0018] Another object of the present invention is to provide an electrical device, comprising the cylindrical battery described above in the specification.

[0019] The beneficial effect of the utility model is that the cylindrical battery center tube of the utility model is configured by setting one end of the tube body as an open end and the other end as a closed end, and the open end faces the injection hole. During the injection process, the electrolyte can enter the tube body from the open end and be blocked by the closed end, so that the electrolyte can be temporarily stored in the tube body and a higher liquid level can be maintained in the tube body. Since the side wall of the tube body has a plurality of first through holes arranged at intervals along the height direction of the tube body, the electrolyte in the tube body can flow out from each first through hole of different heights and infiltrate the battery cell, so that the upper part of the battery cell can be fully infiltrated, preventing the battery cell from lithium deposition during the charge and discharge process due to insufficient infiltration of the upper part of the battery cell, thereby extending the service life of the cylindrical battery and improving the safety of the cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0021] Figure 1 It is a structural schematic diagram of the cylindrical battery of the utility model.

[0022] Figure 2 This is another structural schematic diagram of the cylindrical battery of the utility model.

[0023] Figure 3 It is a structural schematic diagram of the central tube of a cylindrical battery of the utility model.

[0024] Figure 4 It is a schematic diagram of the cross-sectional structure of the central tube of the cylindrical battery of the utility model.

[0025] The reference numerals are described as follows:

[0026] 100. Cylindrical battery;

[0027] 10. Central tube of cylindrical battery; 11. Tube body; 111. Open end; 112. Closed end; 12. First through hole; 13. Second through hole; 14. Raised portion; 141. Hollow cavity; 15. Third through hole;

[0028] 20. Shell;

[0029] 30. Top cover; 31. Cover plate; 32. Pole; 33. Liquid injection hole;

[0030] 40. battery cell; 41. center hole;

[0031] a. The height direction of the tube body; b. The circumferential direction of the tube body. DETAILED DESCRIPTION

[0032] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0033] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0034] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0035] In the utility model, "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the utility model, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0036] The following is combined with Figures 1 to 4 The utility model is further described in detail, but it is not intended to limit the utility model.

[0037] The electric device of the embodiment of the utility model includes a cylindrical battery 100 .

[0038] See also Figures 1-2 The cylindrical battery 100 of the embodiment of the utility model includes a shell 20, a top cover 30, a battery cell 40 and a cylindrical battery center tube 10. The top cover 30 covers the opening of the shell 20 and forms an accommodating cavity between the top cover 30 and the battery cell 40. The battery cell 40 is arranged in the accommodating cavity. The battery cell 40 has a center hole 41. The cylindrical battery center tube 10 is arranged in the center hole 41.

[0039] In some embodiments, a liquid injection hole 33 is disposed on the top cover 30 , and the electrolyte can be injected into the cylindrical battery 100 through the liquid injection hole 33 .

[0040] Specifically, the top cover 30 includes a cover plate 31 and a pole 32, the pole 32 is penetrated on the cover plate 31, and the injection hole 33 is provided on the cover plate 31 or the pole 32. When the injection hole 33 is provided on the pole 32, the injection hole 33 is located directly above the central tube 10 of the cylindrical battery to ensure that the electrolyte can enter the central tube 10 of the cylindrical battery during the injection process.

[0041] See also Figures 1 to 4 The cylindrical battery center tube 10 of the embodiment of the utility model includes a tube body 11, one end of the tube body 11 is an open end 111, and the other end of the tube body 11 is a closed end 112. Along the height direction a of the tube body 11, the side wall of the tube body 11 has a plurality of first through holes 12 arranged at intervals.

[0042] It should be noted that the closed end 112 and the open end 111 are relative concepts. The closed end 112 can be partially closed or completely closed. When a through hole is opened on the closed end 112, the closed end 112 can be considered to be partially closed.

[0043] Compared with the prior art, the cylindrical battery center tube 10 of the utility model embodiment is configured by setting one end of the tube body 11 as an open end 111 and the other end as a closed end 112, and the open end 111 faces the injection hole 33. During the injection process, the electrolyte can enter the tube body 11 from the open end 111 and be blocked by the closed end 112, so that the electrolyte can be temporarily stored in the tube body 11 and a higher liquid level can be maintained in the tube body 11. Since the side wall of the tube body 11 has a plurality of first through holes 12 arranged at intervals along the height direction a of the tube body 11, the electrolyte in the tube body 11 can flow out from each of the first through holes 12 with different heights and infiltrate the battery cell 40, so that the upper part of the battery cell 40 can be fully infiltrated, and lithium deposition of the battery cell 40 during the charging and discharging process can be prevented due to insufficient infiltration of the upper part of the battery cell 40, thereby extending the service life of the cylindrical battery 100 and improving the safety of the cylindrical battery 100.

[0044] In some embodiments, the cross-sectional area of ​​the first through hole 12 near the closed end 112 is smaller than the cross-sectional area of ​​the first through hole 12 near the open end 111. Specifically, along the height direction a of the tube body 11, the cross-sectional area of ​​the first through hole 12 decreases successively from the open end 111 to the closed end 112. In other embodiments, the area near the closed end 112 is the area between 1 / 3-1 / 2 of the height of the tube body 11 and the closed end 112, and the cross-sectional areas of the first through holes 12 in this area may be the same or different; correspondingly, the area near the open end 111 is the area between 1 / 3-1 / 2 of the height of the tube body 11 and the open end 111, and the cross-sectional areas of the first through holes 12 in this area may be the same or different.

[0045] By setting the cross-sectional area of ​​the first through hole 12, since the cross-sectional area of ​​the first through hole 12 near the closed end 112 is smaller, the flow rate of the electrolyte is slower when passing through the first through hole 12 in this area, so that part of the electrolyte can be effectively stored in the tube body 11, and a higher liquid level is maintained in the tube body 11, which effectively prevents the electrolyte from being lost at the closed end 112 of the tube body 11, resulting in the tube body 11 being unable to store the electrolyte, thereby affecting the wetting effect of the upper part of the battery cell 40; since the cross-sectional area of ​​the first through hole 12 near the open end 111 is larger, the flow rate of the electrolyte is faster when passing through the first through hole 12 in this area, while ensuring that the upper part of the battery cell 40 can be fully infiltrated, the electrolyte is effectively prevented from overflowing from the open end 111 of the tube body 11.

[0046] See also Figures 3-4 In some embodiments, the plurality of first through holes 12 are divided into a plurality of first through hole groups, each of which includes at least two first through holes 12, and the plurality of first through hole groups are arranged at intervals along the height direction a of the tube body 11, and at least two first through holes 12 in each first through hole group are arranged at intervals along the circumferential direction b of the tube body 11. By dividing the plurality of first through holes 12 into a plurality of first through hole groups, and the plurality of first through hole groups are arranged at intervals along the height direction a of the tube body 11, the plurality of first through hole groups are effectively distributed at different heights of the side wall of the tube body 11, so that the electrolyte can flow out from each first through hole group at different heights and can infiltrate the entire battery cell 40; at least two first through holes 12 in each first through hole group are arranged at intervals along the circumferential direction b of the tube body 11, so that the electrolyte can flow out from different directions of the side wall of the tube body 11 and infiltrate the battery cell 40 in all directions; thereby effectively enhancing the fluidity of the electrolyte and improving the infiltration effect of the battery cell 40.

[0047] Specifically, a plurality of first through hole groups are arranged at equal intervals along the height direction a of the tube body 11, and at least two first through holes 12 in each first through hole group are arranged at equal intervals along the circumferential direction b of the tube body 11. The plurality of first through holes 12 are effectively evenly distributed on the side wall of the tube body 11, thereby enhancing the structural stability of the tube body 11, and at the same time, enhancing the fluidity of the electrolyte and making the electrolyte evenly distributed, thereby improving the wetting effect of the battery cell 40.

[0048] Generally, the innermost circle of the battery cell is a diaphragm. In some embodiments, a capillary structure is disposed in at least part of the first through hole 12. Through the provision of the capillary structure, the capillary structure is disposed in the first through hole 12 and can be connected or contacted with the diaphragm of the battery cell 40. The capillary structure has a capillary effect and can effectively assist the electrolyte in the tube body 11 to flow to the battery cell 40, thereby improving the wetting effect of the battery cell 40.

[0049] Specifically, the capillary structure is a filament structure or a mesh structure. The capillary structure does not have a conductive effect. Preferably, the capillary structure and the separator of the battery cell 40 are made of the same material.

[0050] In some embodiments, a second through hole 13 is provided on the closed end 112. Through the provision of the second through hole 13, the second through hole 13 can divert the electrolyte in the tube body 11, effectively preventing the electrolyte from being excessively accumulated in the tube body 11 and causing the electrolyte to overflow from the open end 111 of the tube body 11. At the same time, since the second through hole 13 is provided at the closed end 112, the infiltration of the lower part of the battery cell 40 can be effectively ensured.

[0051] See also Figure 3 In some embodiments, the closed end 112 has a protrusion 14 partially protruding toward the inside of the tube body 11, the protrusion 14 has a hollow cavity 141, and the second through hole 13 is arranged on the top wall of the protrusion 14 and communicates with the hollow cavity 141. Through the arrangement of the protrusion 14, during the injection process, since the second through hole 13 is arranged on the top wall of the protrusion 14, the electrolyte can enter the tube body 11 from the open end 111 and be blocked by the closed end 112, so that the electrolyte can be temporarily stored in the tube body 11 and maintain a higher liquid level in the tube body 11. When the liquid level of the electrolyte in the tube body 11 is higher than the height of the protrusion 14, it can be diverted through the second through hole 13 to prevent the electrolyte from overflowing from the open end 111 of the tube body 11. At the same time, through the coordinated use of the first through hole 12 and the second through hole 13, it can be ensured that the entire battery cell 40 can be fully infiltrated at a relatively fast speed.

[0052] See also Figures 3-4 In some embodiments, along the height direction a of the tube body 11, the side wall of the protrusion 14 has a plurality of third through holes 15 arranged at intervals. By setting the third through holes 15, the third through holes 15 are arranged on the side wall of the protrusion 14, which can effectively divert the electrolyte in the tube body 11 and prevent the electrolyte from overflowing from the open end 111 of the tube body 11.

[0053] Furthermore, the plurality of third through holes 15 are divided into a plurality of third through hole groups, each of the third through hole groups includes at least two third through holes 15, the plurality of third through hole groups are spaced apart along the height direction a of the tube body 11, and at least two of the third through holes 15 in each of the third through hole groups are spaced apart along the circumferential direction b of the tube body 11. By dividing the plurality of third through holes 15 into a plurality of third through hole groups, the plurality of third through hole groups are spaced apart along the height direction a of the tube body 11, and the plurality of third through hole groups are effectively distributed at different heights of the side wall of the protruding portion 14, so that the electrolyte can flow out from each third through hole 15 at different heights, and the electrolyte in the tube body 11 is timely diverted; at least two third through holes 15 in each third through hole group are spaced apart along the circumferential direction b of the tube body 11, so that the electrolyte can effectively flow out from different directions of the side wall of the protruding portion 14, and the electrolyte can enter the cylindrical battery 100 in time to ensure the infiltration of the battery cell 40; thereby effectively enhancing the fluidity of the electrolyte and improving the infiltration effect of the battery cell 40.

[0054] In some embodiments, the cross-sectional area of ​​the first through hole 12 is smaller than the cross-sectional area of ​​the second through hole 13 and / or the cross-sectional area of ​​the third through hole 15. When the cross-sectional area of ​​the first through hole 12 is smaller than the cross-sectional area of ​​the second through hole 13 and / or the cross-sectional area of ​​the third through hole 15, and the injection speed of the electrolyte is greater than the outflow speed of the second through hole 13 and / or the outflow speed of the third through hole 15, the electrolyte can be effectively temporarily stored in the tube body 11, and a higher liquid level is maintained in the tube body 11 to ensure the infiltration effect of the upper part of the battery cell 40.

[0055] It should be noted that the relationship between the cross-sectional area of ​​the second through hole 13 and the cross-sectional area of ​​the third through hole 15 can be set according to actual needs. For example, the cross-sectional area of ​​the second through hole 13 is smaller than the cross-sectional area of ​​the third through hole 15, or the cross-sectional area of ​​the third through hole 15 is smaller than the cross-sectional area of ​​the second through hole 13. Of course, the cross-sectional area of ​​the second through hole 13 can also be equal to the cross-sectional area of ​​the third through hole 15.

[0056] It should be noted that by adjusting the cross-sectional areas of the first through hole 12 , the second through hole 13 and the third through hole 15 , the flow rate of the electrolyte inside the cylindrical battery 100 and the infiltration speed of the battery cell 40 can be controlled.

[0057] See also Figure 3In some embodiments, the height of the tube body 11 is H1, and the height of the protrusion 14 is H2, satisfying the relationship: H2:H1=(5-7):10. By setting the height H1 of the tube body 11 and the height H2 of the protrusion 14, the ratio of the height H2 of the protrusion 14 to the height H1 of the tube body 11 cannot be too large or too small. If the ratio of the height H2 of the protrusion 14 to the height H1 of the tube body 11 is too small, the height H2 of the protrusion 14 is shorter than the height H1 of the tube body 11, so that the position height of the second through hole 13 inside the tube body 11 is relatively low, and the electrolyte in the tube body 11 is shunted by the second through hole 13 too early, resulting in the electrolyte being unable to maintain a high liquid level in the tube body 11, which is not conducive to the infiltration effect of the upper part of the battery cell 40; if the ratio of the height H2 of the protrusion 14 to the height H1 of the tube body 11 is too large, the height H2 of the protrusion 14 is close to the height H1 of the tube body 11, so that the second through hole 13 is close to the open end 111 of the tube body 11, and the electrolyte in the tube body 11 is shunted by the second through hole 13 too late, resulting in the electrolyte easily overflowing from the open end 111 of the tube body 11, affecting the injection of the cylindrical battery 100. Therefore, the height H2 of the protrusion 14 and the height H1 of the tube body 11 satisfy the relationship: H2:H1=(5-7):10, which can ensure that the battery cell 40 is fully wetted while preventing the electrolyte from overflowing from the open end 111 of the tube body 11.

[0058] See also Figure 3In some embodiments, the inner diameter of the tube body 11 is D1, and the outer diameter of the protrusion 14 is D2, satisfying the relationship: D2: D1 = (3-8): 10. By setting the inner diameter D1 of the tube body 11 and the outer diameter D2 of the protrusion 14, the ratio of the outer diameter D2 of the protrusion 14 to the inner diameter D1 of the tube body 11 cannot be too large or too small. When the height is constant, if the ratio of the outer diameter D2 of the protrusion 14 to the inner diameter D1 of the tube body 11 is too small, the volume occupied by the protrusion 14 in the tube body 11 is small, so that the space for the hollow cavity 141 to accommodate the circulation of the electrolyte is small, which is easy to affect the shunting effect of the second through hole 13 and the third through hole 15, causing the electrolyte to easily overflow from the open end 111 of the tube body 11, affecting the injection of the cylindrical battery 100; if the ratio of the outer diameter D2 of the protrusion 14 to the inner diameter D1 of the tube body 11 is too large, the volume occupied by the protrusion 14 in the tube body 11 is large, so that the space for the tube body 11 to store the electrolyte is small, thereby reducing the liquid storage capacity of the tube body 11, causing the electrolyte to easily overflow from the open end 111 of the tube body 11, affecting the injection of the cylindrical battery 100, and at the same time affecting the infiltration speed of the battery cell 40. Therefore, the outer diameter D2 of the protrusion 14 and the inner diameter D1 of the tube body 11 satisfy the relationship: D2:D1=(3~8):10, which can ensure the liquid storage capacity of the tube body 11 and prevent the electrolyte from overflowing from the open end 111 of the tube body 11. At the same time, the wetting speed of the battery cell 40 is increased and the wetting time of the battery cell 40 is shortened.

[0059] In some embodiments, the outer diameter of the protrusion 14 gradually decreases from the closed end 112 to the open end 111. By setting the outer diameter of the protrusion 14, since the outer diameter of the protrusion 14 near the open end 111 is smaller than the outer diameter of the protrusion 14 near the closed end 112, that is, the liquid storage capacity of the portion of the tube body 11 near the closed end 112 is smaller than the liquid storage capacity of the portion of the tube body 11 near the open end 111, the liquid level of the portion of the tube body 11 near the closed end 112 rises faster, so that the electrolyte can maintain a higher liquid level in the tube body 11 to ensure the wetting effect of the upper part of the battery cell 40.

[0060] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A cylindrical battery center tube, characterized in that: The invention comprises a tube body (11), one end of the tube body (11) is an open end (111), the other end of the tube body (11) is a closed end (112), and along the height direction (a) of the tube body (11), the side wall of the tube body (11) has a plurality of first through holes (12) arranged at intervals.

2. The cylindrical battery center tube according to claim 1, characterized in that: The cross-sectional area of ​​the first through hole (12) close to the closed end (112) is smaller than the cross-sectional area of ​​the first through hole (12) close to the open end (111).

3. The cylindrical battery center tube according to claim 1, characterized in that: The plurality of first through holes (12) are divided into a plurality of first through hole groups, each of the first through hole groups comprises at least two first through holes (12), the plurality of first through hole groups are arranged at intervals along a height direction (a) of the tube body (11), and at least two of the first through holes (12) in each of the first through hole groups are arranged at intervals along a circumferential direction (b) of the tube body (11).

4. The cylindrical battery center tube according to any one of claims 1 to 3, characterized in that: At least part of the first through hole (12) is provided with a capillary structure.

5. The cylindrical battery center tube according to claim 1, characterized in that: The closed end (112) is provided with a second through hole (13).

6. The cylindrical battery center tube according to claim 5, characterized in that: The closed end (112) has a protruding portion (14) partially protruding toward the interior of the tube body (11), the protruding portion (14) has a hollow cavity (141), and the second through hole (13) is arranged on the top wall of the protruding portion (14) and communicates with the hollow cavity (141).

7. The cylindrical battery center tube according to claim 6, characterized in that: Along the height direction (a) of the tube body (11), the side wall of the protruding portion (14) has a plurality of third through holes (15) arranged at intervals.

8. The cylindrical battery center tube according to claim 7, characterized in that: The plurality of third through holes (15) are divided into a plurality of third through hole groups, each of the third through hole groups comprises at least two third through holes (15), the plurality of third through hole groups are arranged at intervals along the height direction (a) of the tube body (11), and at least two of the third through holes (15) in each of the third through hole groups are arranged at intervals along the circumferential direction (b) of the tube body (11).

9. The cylindrical battery center tube according to claim 7, characterized in that: The cross-sectional area of ​​the first through hole (12) is smaller than the cross-sectional area of ​​the second through hole (13) and / or the cross-sectional area of ​​the third through hole (15).

10. The cylindrical battery center tube according to claim 6, characterized in that: The height of the tube body (11) is H1, and the height of the protruding portion (14) is H2, satisfying the relationship: H2:H1=(5-7):

10.

11. The cylindrical battery center tube according to claim 6, characterized in that: The inner diameter of the tube body (11) is D1, and the outer diameter of the protruding portion (14) is D2, satisfying the relationship: D2:D1=(3-8):

10.

12. A cylindrical battery, characterized in that: The invention comprises a shell (20), a top cover (30), a battery cell (40) and a cylindrical battery center tube according to any one of claims 1 to 11, wherein the top cover (30) is arranged on the opening of the shell (20) and an accommodation cavity is formed between the top cover (30) and the battery cell (40) is arranged in the accommodation cavity, the battery cell (40) has a center hole (41), the cylindrical battery center tube is arranged in the center hole (41), the top cover (30) is provided with a liquid injection hole (33), and the opening end (111) faces the liquid injection hole (33).

13. An electrical equipment, characterized in that: Including the cylindrical battery as claimed in claim 12.

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