A cylindrical battery cell

Abstract

The present invention provides a cylindrical battery cell, comprising a core package, an end cap, a hollow tube and a locking part; a reserved channel is axially arranged at the center of the core package; the end cap is arranged at one end of the core package along its axis; the hollow tube is inserted into the reserved channel; a first pole column is arranged at the center of the end cap, and a channel is formed in the first pole column; one end of the hollow tube facing the end cap is connected to the first pole column and communicated with the channel; the locking part is arranged on the first pole column, and the locking part moves relative to the first pole column to close or open one end of the channel far away from the hollow tube; through the communication structure between the hollow tube and the channel, the channel can be automatically closed or opened, which can not only inject electrolyte into the battery cell, but also when the battery cell is exhausted, the gas can squeeze the locking part to make it bounce open and open the channel for exhaust. It not only realizes the functions of the liquid injection hole and the explosion-proof valve through one hole, but also will not cause irreversible damage to the battery cell itself, which is helpful for the reuse of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and particularly to a cylindrical battery cell. Background Art

[0002] At present, two holes are simultaneously opened on the end cap of the cylindrical battery cell. One hole is used to inject electrolyte into the battery cell, and the other hole is used to arrange an explosion-proof device for the battery cell. Moreover, the explosion-proof valve hole and the liquid injection hole are not compatible. The reason is that after the liquid injection hole is generally filled with electrolyte into the battery cell through a liquid injection device, it will be sealed by dotting or sealing glue, so the explosion-proof function cannot be realized subsequently; while the explosion-proof valve hole generally arranges an explosion-proof device by setting an explosion-proof metal sheet or setting an aluminum-plastic film. Chinese Patent CN213583894U discloses the internal structure of a currently common cylindrical battery cell.

[0003] However, the above design has two disadvantages:

[0004] Firstly, in terms of the processing procedure, the end cap of the battery cell needs to be processed twice, and processes such as applying glue and welding an explosion-proof metal sheet need to be carried out separately. The process flow is long, and the assembly materials increase, greatly increasing the product cost.

[0005] Secondly, after the current battery cell is used for a long time, a large amount of electrolyte in the battery cell is consumed, and it is difficult to supplement the electrolyte. At the same time, since a large amount of gas is generated inside the battery cell and breaks through the explosion-proof valve and is discharged, the sealing structure of the battery cell is damaged. Therefore, it is difficult to reuse the battery cell. Summary of the Invention

[0006] In view of this, the present invention provides a cylindrical battery cell to solve the problems that the current end cap of the battery cell needs to be processed twice and the battery cell cannot be reused.

[0007] The technical solution of the present invention is realized as follows: The present invention provides a cylindrical battery cell, including a core package, with a reserved channel axially arranged in the center; an end cap arranged at one end of the core package along the axial direction; a hollow tube inserted into the reserved channel; a locking part; wherein, a first pole column is arranged in the center of the end cap, and a channel is opened in the first pole column; one end of the hollow tube facing the end cap is connected to the first pole column and communicated with the channel; the locking part is arranged on the first pole column, and the locking part moves relative to the first pole column to close or open one end of the channel far from the hollow tube.

[0008] On the basis of the above technical solution, preferably, it further includes a flexible tube; wherein, one end of the flexible tube passes through the channel and is communicated with the end of the hollow tube facing the end cap, and the other end of the flexible tube extends in the direction away from the end cap; the locking part moves relative to the first pole column and squeezes the flexible tube to close it, and when the locking part is far from the flexible tube, the flexible tube resets.

[0009] Further preferably, a slide groove is provided on the outer peripheral wall of the first pole away from the end of the end cover, one end of the slide groove is connected with the channel and the other end is connected with the outside world, and a protrusion is provided on the inner wall of the slide groove; the locking part is inserted in the slide groove, and a plurality of grooves are arranged on the outer surface of the locking part along the extension direction of the slide groove. The locking part moves along the slide groove and causes the protrusion to be stuck in one of the grooves, and the locking part squeezes the hose toward the end of the channel and presses against the inner wall of the channel to close the hose.

[0010] On the basis of the above technical solution, preferably, a first pole lug group and a second pole lug group are respectively provided at two axial ends of the core package; the first pole lug group is close to the end cover; the second pole lug group is far away from the end cover; one end of the hollow tube is connected to the first pole lug group or the second pole lug group.

[0011] More preferably, it also includes an adapter; wherein one end of the hollow tube away from the end cover is connected to the second pole lug group; a second pole is also provided on the end cover, and the second pole is spaced apart from the first pole; and the adapter is provided between the second pole and the first pole lug group.

[0012] More preferably, it further comprises a spacer; wherein the spacer is arranged on the end surface of the end cover away from the core package, the spacer is located between the first pole and the second pole, and the spacer has insulation capability.

[0013] More preferably, the adapter is a conical coil spring, one end of the adapter is fixed on the second pole and the other end is in contact with the first pole lug group; the end cover approaches the core package and squeezes the adapter to maximize the compression of the adapter and make the end of the adapter fixed on the end cover also contact the first pole lug group.

[0014] More preferably, it also includes a first collecting plate, which is arranged between the core package and the end cover and connected to the first electrode lug group; a second collecting plate, which is arranged at one end of the core package axially away from the end cover and connected to the second electrode lug group; wherein a through hole is opened in the center of the first collecting plate; the hollow tube passes through the through hole and leaves a gap between the hollow tube and the first collecting plate, and the end of the hollow tube away from the end cover is connected to the center of the second collecting plate.

[0015] On the basis of the above technical solution, preferably, the outer wall of the hollow tube is in close contact with the inner wall of the reserved channel, and an insulating layer is coated on the outer wall of the hollow tube.

[0016] On the basis of the above technical solution, preferably, the end of the hollow tube away from the end cover is through or closed, and a plurality of hollow holes are evenly distributed on the outer peripheral wall of the hollow tube.

[0017] The cylindrical battery cell of the present invention has the following beneficial effects compared with the prior art:

[0018] (1) In the present invention, a hollow tube is inserted into the reserved channel in the center of the core package, and the hollow tube is connected to the channel on the end cap pole. The channel can be autonomously closed or opened. Through the connection structure of the hollow tube and the channel, not only can the electrolyte be poured into the battery cell, but also when the battery cell exhausts gas, the gas can squeeze the locking part to make it bounce open and open the channel for exhaust. This not only realizes the functions of the liquid injection hole and the explosion-proof valve through one hole, but also does not cause irreversible damage to the battery cell itself, which is helpful for the reuse of the battery cell.

[0019] (2) In the present invention, a flexible tube is inserted into the channel and connected to the hollow tube. When the locking part closes the channel, the flexible tube is easily deformed under the extrusion of the locking part and fills the corner gaps of the channel to achieve sealing. At the same time, when the battery cell exhausts gas inside, the gas can squeeze the flexible tube to make it deform and reset, thereby being able to push the locking part to open the channel to achieve the purpose of explosion-proof exhaust.

[0020] (3) The outer wall of the hollow tube in the present invention is closely attached to the inner wall of the reserved channel of the core package, and an insulating layer is coated on the outer wall of the hollow tube, making the hollow tube become the internal support framework of the core package, avoiding the core package from protruding into the reserved channel when deforming due to extrusion. At the same time, the hollow tube is also helpful for heat dissipation inside the core package.

[0021] (4) In the present invention, the positive and negative poles are arranged on the same end cap of the core package, which is convenient for assembly and connection pipeline design when the battery cells form a module, and is helpful for reducing the volume of the module. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a three-dimensional view of the cylindrical battery cell of the present invention;

[0024] Figure 2 It is a top view of the cylindrical battery cell of the present invention;

[0025] Figure 3 It is a side sectional view of the cylindrical battery cell of the present invention;

[0026] Figure 4 It is a side sectional view of another state of the cylindrical battery cell of the present invention;

[0027] Figure 5 For the present invention Figure 4 The enlarged view of part A;

[0028] Figure 6Side sectional view of another embodiment of the cylindrical battery cell of the present invention;

[0029] Figure 7 of the present invention Figure 6 Enlarged view of part B in

[0030] In the figure: 1, core package; 11, first tab group; 12, second tab group; 101, reserved channel; 2, end cap; 21, first terminal; 22, second terminal; 211, protrusion; 201, channel; 202, chute; 3, hollow tube; 4, locking part; 401, groove; 5, hose; 6, adapter; 7, separator; 8, first current collector plate; 801, through hole; 9, second current collector plate. Detailed implementation mode

[0031] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Example 1:

[0033] As Figure 1 shown, in combination with Figure 5 , a cylindrical battery cell of the present invention includes a core package 1, an end cap 2, a hollow tube 3 and a locking part 4.

[0034] Among them, a reserved channel 101 is axially arranged in the center of the core package 1. The core package 1 is the rolled core of the cylindrical battery cell. During production, the unfolded core package 1 is generally wound layer by layer on a winding needle, and after winding, the winding needle is withdrawn, so as to form a reserved channel 101 in the core package 1. The inner diameter of the reserved channel 101 is usually 3 mm. Its functions include not only facilitating the withdrawal of the winding needle, but also helping to remove excess moisture inside the battery cell during the assembly of the all-tab core package 1 of the cylindrical battery cell, thereby improving the performance and quality of the battery cell.

[0035] The end cap 2 is arranged at one end of the core package 1 in the axial direction. A first terminal 21 is arranged in the center of the end cap 2, and a channel 201 is opened in the first terminal 21, through which the inside of the battery cell can be connected to the external environment. It should be noted that the outer shell structure of the cylindrical battery cell usually includes a hollow cylindrical shell and top and bottom covers covering both ends thereof, so as to form a battery cell outer shell. The positive electrode and the negative electrode are respectively arranged on the top cover and the bottom cover. In this embodiment, the end cap 2 is actually the top cover. Since this solution does not involve the improvement of the overall outer shell of the cylindrical battery cell, the shell structure of the battery cell is not described in detail.

[0036] The hollow tube 3 is inserted into the reserved channel 101, and one end of the hollow tube 3 facing the end cap 2 is connected to the first pole 21 and is in communication with the channel 201. In this embodiment, the communication structure formed by the hollow tube 3 and the channel 201 has two functions. One is to facilitate the injection of electrolyte from the outside into the battery cell, and the other is to facilitate the discharge of the gas generated inside the battery cell to the outside. Therefore, the communication structure formed by the hollow tube 3 and the channel 201 actually realizes the two functions of the liquid injection hole and the explosion-proof valve hole at the same time.

[0037] In addition, the length of the part of the hollow tube 3 inserted into the reserved channel 101 cannot be greater than the length of the reserved channel 101. For liquid injection and exhaust, the end of the hollow tube 3 away from the end cap 2 can be through; or the end of the hollow tube 3 away from the end cap 2 can also be closed, and at the same time, a number of hollow holes are uniformly arranged on the outer peripheral wall of the hollow tube 3, and gas or liquid can enter the hollow tube 3 more evenly or be discharged from the hollow tube 3 into the core package 1 through the hollow holes.

[0038] However, the inside of the battery cell needs to be in a sealed state during use. To solve the sealability of the communication structure formed by the hollow tube 3 and the channel 201, the locking part 4 is arranged on the first pole 21. The locking part 4 is similar to the valve switch on the channel 201. The locking part 4 moves relative to the first pole 21 to close or open one end of the channel 201 away from the hollow tube 3.

[0039] When assembling the battery cell, the locking part 4 opens the channel 201, and then the electrolyte is injected into the core package 1 through the channel 201 and the hollow tube 3. After the liquid injection is completed, the locking part 4 locks and closes the channel 201; after the battery cell is continuously used for a long time and a large amount of gas is generated inside the battery cell, when the pressure inside the battery cell increases, the locking part 4 will pop open under the action of the pressure and open the channel 201. The gas will gather in the hollow tube 3 and be discharged to the outside through the channel 201. After the exhaust is completed and the liquid is re-injected, the battery cell can be used again.

[0040] Embodiment Two:

[0041] On the basis of Embodiment One, it is described that the locking part 4 will pop open and open the channel 201 under the action of pressure. To achieve this function, as Figure 1 shown, in combination with Figure 7 , a hose 5 is further included.

[0042] Among them, the hose 5 is generally made of rubber material and thus has elasticity. One end of the hose 5 passes through the channel 201 and is connected to the end of the hollow tube 3 facing the end cap 2, and the other end of the hose 5 extends in the direction away from the end cap 2; in order to ensure the tight connection between the hose 5 and the hollow tube 3, the outer wall of the end of the hose 5 inserted into the hollow tube 3 is bonded to the inner wall of the hollow tube 3, or the end of the hose 5 is wrapped around the outer wall of the end of the hollow tube 3. The reason for using the rubber-made hose 5 is that on the one hand, it is convenient to inject liquid and exhaust air through the hose 5, and on the other hand, the elastic hose 5 can be regarded as an elastic filling body after being squeezed and deformed, and can effectively fill the corner gap between the locking portion 4 and the inner wall of the channel 201, so as to ensure the sealing performance when the channel 201 is closed by the locking portion 4.

[0043] The locking portion 4 moves relative to the first pole 21 and squeezes the hose 5 to close it. When the locking portion 4 moves away from the hose 5, the hose 5 resets.

[0044] Specifically, in order to realize the elastic locking function of the cooperation between the locking portion 4 and the hose 5, a chute 202 is provided on the outer peripheral wall of the end of the first pole 21 away from the end cap 2. One end of the chute 202 is connected to the channel 201 and the other end is connected to the outside, and a protrusion 211 is provided on the inner wall of the chute 202.

[0045] The locking portion 4 is inserted into the chute 202. A plurality of grooves 401 are arranged on the outer surface of the locking portion 4 along the extending direction of the chute 202. The locking portion 4 moves along the chute 202 and makes the protrusion 211 snap into one of the grooves 401. The end of the locking portion 4 facing the channel 201 squeezes the hose 5 and abuts against the inner wall of the channel 201 to close the hose 5. Or simply put, the above structure is a common elastic lock device.

[0046] When the locking portion 4 moves to close the channel 201, since the first pole 21 is a metal part and the locking portion 4 is a metal part or a plastic part, both the first pole 21 and the locking portion 4 are hard materials. Even if the first pole 21 and the locking portion 4 abut against each other, there will inevitably be a slight gap between them. At this time, the elastic hose 5 is filled between the first pole 21 and the locking portion 4. After being squeezed by the locking portion 4, the hose 5 deforms, which can not only fill the slight gap between the first pole 21 and the locking portion 4, but also play a certain buffering role to avoid possible damage to the surface of the locking portion 4 when it abuts against the first pole 21.

[0047] In order to enable the locking part 4 to spring open under pressure, the end of the locking part 4 inserted into the channel 201 facing the surface of the core package 1 is an inclined surface. The gas inside the battery cell presses against the inclined surface, and a part of the acting force on the inclined surface causes the locking part 4 to spring open. Then, the hose 5 is no longer under pressure and resumes its tubular shape, enabling the gas inside the battery cell to be discharged outside the battery cell through the hose 5, thus realizing the function of the explosion-proof valve. After the exhaust is completed, since neither the hose 5, the channel 201 nor the locking part 4 is damaged, after performing a certain processing technology on the battery cell, only by providing the hose 5 again to inject electrolyte into the core package 1 and then moving the locking part 4 to re-close the channel 201 can the battery cell be reused.

[0048] Compared with the current cylindrical battery cells where the injection hole needs to be patch-packaged after injection and the explosion-proof valve hole is damaged and cannot be reused after exhaust, the structure of the locking part 4, the hose 5 and the channel 201 cooperating with each other in this embodiment realizes the reuse of the battery cell.

[0049] Embodiment Three:

[0050] On the basis of Embodiment One, on the core package 1 of the current cylindrical battery cell, a first tab group 11 and a second tab group 12 are respectively arranged at both axial ends of the core package 1.

[0051] Among them, the first tab group 11 is close to the end cap 2, and the second tab group 12 is far from the end cap 2.

[0052] Since the hollow tube 3 is fixedly connected to the first pole 21, one end of the hollow tube 3 is connected to the first tab group 11 or the second tab group 12, enabling the hollow tube 3 to function similar to a jumper.

[0053] Specifically, in one case, when the hollow tube 3 is connected to the first tab group 11 at the top of the core package 1, the hollow tube 3 does not need to extend along its length to the other axial end of the core package 1, and the end of the hollow tube 3 can be inserted into the reserved channel 101 as much as possible.

[0054] Embodiment Four:

[0055] On the basis of the first embodiment, compared with the third embodiment, as another case, the hollow tube 3 can also be connected to the second pole lug group 12 at the bottom of the core package 1, and the hollow tube 3 extends along its length to the other axial end of the core package 1, and is connected to the second pole lug group 12. On the core package 1 of the cylindrical battery, the full pole lug groups at both ends of the core package 1 are kneaded into a plurality of fan-shaped pole lug groups by a flattening mechanism. Therefore, when the second pole lug group 12 is connected to the hollow tube 3, the end of the hollow tube 3 is expanded, so that the outer wall of the end of the hollow tube 3 is simultaneously connected to each fan-shaped pole lug group of the second pole lug group 12. It should be noted that the above structure is only a form of connection between the hollow tube 3 and the second pole lug group 12. In the current cylindrical battery field, the connection between the hollow tube 3 and the second pole lug group 12 is already a mature technology, and the present invention does not involve the improvement of this mature technology, but only utilizes it. Therefore, in this embodiment, the connection structure and connection method of the hollow tube 3 and the second pole lug group 12 are not described in detail.

[0056] Back to the topic, when the hollow tube 3 is connected to the second pole lug group 12 at the bottom of the core package 1, the hollow tube 3 can be regarded as a transition structure between the second pole lug group 12 and the first pole 21; therefore, the first pole lug group 11 also requires another transition structure to connect to the outside of the battery cell.

[0057] like Figure 1 As shown, combined Figure 3 , and also includes an adapter 6.

[0058] The end cover 2 is also provided with a second pole 22 , which is spaced apart from the first pole 21 to prevent the second pole 22 from accidentally contacting the first pole 21 and causing a short circuit in the battery cell.

[0059] The adapter 6 is disposed between the second pole 22 and the first pole lug group 11 ; the adapter 6 may be a conventional adapter sheet.

[0060] In the present embodiment, the first pole 21 and the second pole 22 are both arranged on the same end cover 2 of the battery cell. Therefore, compared with the existing cylindrical battery cells, the positive and negative electrodes of the cylindrical battery cells in the present embodiment are both arranged on the same end cover 2 of the battery cell. The advantage of this design is that the cylindrical battery cells are similar to the square shell battery cells, and their positive and negative electrodes are both located at the top of the battery cells. Therefore, when several cylindrical battery cells form a module, the connecting pipelines respectively connecting the positive and negative electrodes of the cylindrical battery cells can be arranged above the battery cells, without having to be arranged above and below the battery cells respectively. This not only helps the wiring design of the pipelines, but also makes the volume of the module smaller.

[0061] Embodiment five:

[0062] Based on the fourth embodiment, Figure 1 As shown, combined Figure 4, the adapter 6 is a conical helical spring. One end of the adapter 6 is fixedly provided on the second terminal 22 and the other end is in contact with the first tab group 11.

[0063] The end cap 2 approaches the core package 1 and presses the adapter 6, so that the adapter 6 is compressed to the maximum, and the end of the adapter 6 fixedly provided on the end cap 2 also contacts the first tab group 11.

[0064] In this embodiment, the adapter 6 is a conical helical spring. The reason is that after the helical spring is compressed to the maximum, the helical spring deforms into a structure similar to a sheet and contacts the first tab group 11, so that the helical spring plays a role similar to that of a connecting piece; compared with the connecting piece, the contact part between the helical spring and the first tab group 11 does not need to be welded, so there will be no common problems such as false soldering or slag generation of the connecting piece; and, if other types of springs are used, such as cylindrical springs, since their helical lines coincide, after being compressed to the maximum, the helical lines will be pressed together, resulting in a relatively thick thickness of the spring.

[0065] The end of the adapter 6 can be directly welded to the inner end of the second terminal 22, but in this case, in order to avoid false soldering or slag generation, the end of the helical spring can be connected to the inner end of the second terminal 22 through a clamping structure or a plugging structure.

[0066] In addition, a ring can be connected to the outermost circle at the bottom of the conical helical spring of the adapter 6. The ring can contact all the sector tab groups of the first tab group 11, so that all the tab groups of the first tab group 11 can be electrically connected to the second terminal 22, thus ensuring the full-power output of the first tab group 11.

[0067] Embodiment Six:

[0068] On the basis of Embodiment Five, although the present invention does not need to use a current collector plate to connect all the tabs in the way of connecting the terminal by the current collector plate, the present invention is still applicable to the cell structure using a current collector plate, such as Figure 1 shown, combined with Figure 6 , it further includes a first current collector plate 8 and a second current collector plate 9.

[0069] Among them, the first current collector plate 8 is arranged between the core package 1 and the end cap 2 and is connected to the first tab group 11. A through hole 801 is formed in the center of the first current collector plate 8; the hollow tube 3 passes through the through hole 801 and there is a gap between the hollow tube 3 and the first current collector plate 8. One end of the hollow tube 3 away from the end cap 2 is connected to the center of the second current collector plate 9 to avoid short circuit.

[0070] The second current collector plate 9 is arranged at one end of the core package 1 axially away from the end cap 2 and is connected to the second tab group 12.

[0071] Embodiment Seven:

[0072] Based on Embodiment 4, as Figure 1 shown, in combination with Figure 2 , it further includes a spacer 7.

[0073] Among them, the spacer 7 is arranged on the end face of the end cap 2 away from the core package 1. The spacer 7 is located between the first pole 21 and the second pole 22, and the spacer 7 has insulation ability. The spacer 7 can be regarded as an arc extinguishing device, effectively separating the first pole 21 and the second pole 22 to prevent the short circuit of the battery cell during use.

[0074] Embodiment 8:

[0075] Based on Embodiment 1, the outer wall of the hollow tube 3 is closely attached to the inner wall of the reserved channel 101. The advantages of this are as follows. Firstly, the hollow tube 3 plays a structural support role in the center of the core package 1, preventing the core package 1 from collapsing into the reserved channel 101 or causing battery cell defects due to long service life. Secondly, since the hollow tube 3 is usually a metal tube, it helps to conduct the temperature inside the core package 1 to both ends of the battery cell for heat dissipation.

[0076] At the same time, in order to ensure that there is no short circuit when the outer wall of the hollow tube 3 contacts the inner wall of the reserved channel 101 of the core package 1, an insulating layer is coated on the outer wall of the hollow tube 3. Specifically, the hollow tube 3 is a hollow copper tube with surface electroplated enamel.

[0077] Embodiment 9:

[0078] In the case of no technical conflict, it further includes any combination of Embodiments 1 to 8.

[0079] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A cylindrical battery cell, characterized in that, Comprising: A core package (1) with a reserved channel (101) axially arranged in the center; An end cap (2) arranged at one end of the core package (1) axially; A hollow tube (3) inserted into the reserved channel (101); A locking part (4); A flexible tube (5); Wherein, a first pole column (21) is arranged in the center of the end cap (2), and a channel (201) is opened in the first pole column (21); One end of the hollow tube (3) facing the end cap (2) is connected to the first pole column (21) and communicated with the channel (201); The locking part (4) is arranged on the first pole column (21), and the locking part (4) moves relative to the first pole column (21) to close or open one end of the channel (201) away from the hollow tube (3); One end of the flexible tube (5) passes through the channel (201) and is communicated with the end of the hollow tube (3) facing the end cap (2), and the other end of the flexible tube (5) extends in a direction away from the end cap (2); The locking part (4) moves relative to the first pole column (21) and squeezes the flexible tube (5) to close it. When the locking part (4) is away from the flexible tube (5), the flexible tube (5) resets.

2. The cylindrical battery cell according to claim 1, wherein: A sliding groove (202) is opened on the outer peripheral wall of one end of the first pole column (21) away from the end cap (2). One end of the sliding groove (202) is communicated with the channel (201) and the other end is communicated with the outside. A protruding part (211) is arranged on the inner wall of the sliding groove (202); The locking part (4) is inserted into the sliding groove (202). A plurality of grooves (401) are arranged on the outer surface of the locking part (4) along the extending direction of the sliding groove (202). The locking part (4) moves along the sliding groove (202) to make the protruding part (211) snap into one of the grooves (401). The end of the locking part (4) facing the channel (201) squeezes the flexible tube (5) and abuts against the inner wall of the channel (201) to close the flexible tube (5).

3. The cylindrical battery cell according to claim 1, characterized in that: First pole ear groups (11) and second pole ear groups (12) are respectively arranged at both axial ends of the core package (1); The first pole ear group (11) is close to the end cap (2); The second pole ear group (12) is away from the end cap (2); One end of the hollow tube (3) is connected to the first pole ear group (11) or the second pole ear group (12).

4. The cylindrical battery cell according to claim 3, wherein Further comprising: An adapter (6); Wherein, one end of the hollow tube (3) away from the end cap (2) is connected to the second pole ear group (12); A second pole column (22) is further arranged on the end cap (2), and the second pole column (22) is arranged at an interval from the first pole column (21); The adapter (6) is arranged between the second pole column (22) and the first pole ear group (11).

5. The cylindrical battery cell according to claim 4, wherein Further comprising: A spacer (7); Wherein, the spacer (7) is arranged on the end face of the end cap (2) away from the core package (1). The spacer (7) is located between the first pole column (21) and the second pole column (22), and the spacer (7) has insulating ability.

6. The cylindrical battery cell according to claim 4, characterized in that: The adapter (6) is a conical helical spring. One end of the adapter (6) is fixedly arranged on the second pole column (22), and the other end is in contact with the first tab group (11). The end cap (2) approaches the core package (1) and presses the adapter (6) to maximize the compression of the adapter (6), and makes one end of the adapter (6) fixedly arranged on the end cap (2) also contact the first tab group (11).

7. The cylindrical battery cell according to claim 4, wherein, It further includes: A first current collector plate (8) is arranged between the core package (1) and the end cap (2) and is connected to the first tab group (11). A second current collector plate (9) is arranged at one end of the core package (1) axially away from the end cap (2) and is connected to the second tab group (12). Wherein, a through hole (801) is formed in the center of the first current collector plate (8). The hollow tube (3) passes through the through hole (801) and has a gap with the first current collector plate (8). One end of the hollow tube (3) away from the end cap (2) is connected to the center of the second current collector plate (9).

8. The cylindrical battery cell according to claim 1, wherein: The outer wall of the hollow tube (3) is closely attached to the inner wall of the reserved channel (101), and an insulating layer is coated on the outer wall of the hollow tube (3).

9. The cylindrical battery cell according to claim 1, wherein: The end of the hollow tube (3) away from the end cap (2) is either through or closed, and a plurality of hollow holes are evenly distributed on the outer peripheral wall of the hollow tube (3).

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