Cylindrical battery

Abstract

The utility model provides a cylindrical battery. The cylindrical battery comprises a shell assembly, a pole assembly, a convergence assembly and a battery cell, the shell assembly comprises a shell provided with a containing cavity, a first battery cover plate and a second battery cover plate, the first battery cover plate and the second battery cover plate cover the two ends of the shell, and the battery cell is installed in the containing cavity; the pole assembly comprises a first pole, a second pole and a sealing nail, the first pole is mounted on the first battery cover plate, a liquid injection through hole is formed in the center of the first pole, the sealing nail is mounted in the liquid injection through hole, and the second pole is mounted on the second battery cover plate; the confluence assembly comprises a first confluence plate assembly and a second confluence plate assembly which are respectively connected to two ends of the battery cell; a liquid injection through hole is formed in the center of the first confluence plate assembly; the liquid injection through hole is located in the center of the first pole, so that the liquid injection speed is increased, the position of the liquid injection port is high, electrolyte splashing is reduced, the liquid passing channel is formed in the center of the first confluence plate assembly, and welding spots at the joint of the first confluence plate assembly and the battery cell are uniform.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical batteries, in particular to a cylindrical battery. Background Art

[0002] With the rapid development of the new energy industry, various manufacturers have continuously invested in the research and development of tab-free large cylindrical battery structures based on considerations such as energy density, standardization, and cost reduction. However, there are still problems in the design of supporting large cylindrical battery structures.

[0003] During the liquid filling process of cylindrical batteries, the current conventional design is to design the liquid filling port on the battery cover of the battery shell. The liquid filling port is located on one side of the battery cover. Therefore, there will be a problem of slow liquid filling speed during liquid filling, and gas will be generated during the formation process. The electrolyte is easy to seep out and affect the appearance of the shell. Electrolyte splashes when the sealing pins are welded, etc., which makes the cylindrical battery yield and filling volume both low, such as the technical solution disclosed in the comparative document CN202120775449.0. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a cylindrical battery with a faster liquid injection speed, reduced electrolyte seepage and increased liquid injection volume.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A cylindrical battery, comprising a shell assembly, a pole assembly, a busbar assembly and a battery cell, wherein the shell assembly comprises a shell, a first battery cover and a second battery cover, wherein the first battery cover is disposed at one end of the shell, and the second battery cover is disposed at the other end of the shell, wherein a receiving cavity is provided in the shell, and the battery cell is installed in the receiving cavity, wherein:

[0007] The pole assembly includes a first pole, a second pole and a sealing nail, the first battery cover is provided with a first mounting through hole, the second battery cover is provided with a second mounting through hole, the first mounting through hole and the second mounting through hole are respectively connected to the accommodating cavity, the first pole is penetrated through the first mounting through hole, a liquid injection through hole is provided at the center of the first pole, the sealing nail is installed in the liquid injection through hole, and the second pole is penetrated through the second mounting through hole;

[0008] The busbar assembly includes a first busbar assembly and a second busbar assembly. A liquid passage is provided at the center of the first busbar assembly, and the liquid passage is connected to the accommodating cavity. A winding needle center hole is formed on the battery cell, and two ends of the liquid passage are respectively connected to the winding needle center hole and the liquid injection through hole. One end of the first busbar assembly is connected to the first pole and the first battery cover, the other end of the first busbar assembly is connected to one end of the battery cell, and the other end of the second busbar assembly is connected to the second pole and the second battery cover.

[0009] In one embodiment, the first busbar assembly includes a first fixing belt, a first connecting belt and a first connecting plate, the first fixing belt is provided with a first through hole, the first connecting belt is provided with a second through hole, the first connecting plate is provided with a third through hole, one side of the first connecting plate is connected to one end of the battery cell, the first fixing belt is connected to the first battery cover plate and to the first pole, the first through hole is connected to the liquid injection through hole, the two ends of the first connecting belt are respectively connected to the first fixing belt and the first connecting plate, the first connecting plate is also connected to the other end of the battery cell, the third through hole is connected to the center hole of the winding needle, and the first through hole, the second through hole and the third through hole together form the liquid passage.

[0010] In one embodiment, the second busbar assembly includes a second fixing strap, a second connecting strap and a second connecting plate, the second fixing strap is connected to the second battery cover and to the second pole, the two ends of the second connecting strap are respectively connected to the second connecting plate, and one side of the second connecting plate is connected to the other end of the battery cell.

[0011] In one embodiment, the first battery cover includes a first sealing cover and a first isolation sheet, the first sealing cover is provided with a first sealing through hole, the first sealing cover is covered on the shell, the first isolation sheet is arranged in the accommodating cavity and covers a side of the first sealing cover adjacent to the battery cell, the first busbar assembly is connected to the first isolation sheet, the first isolation sheet is provided with a first isolation through hole, the first isolation through hole is connected to the first sealing through hole to form the first mounting through hole; and\or,

[0012] The second battery cover plate includes a second sealing cover and a second isolation sheet, the second sealing cover is provided with a second sealing through hole, the second sealing cover is covered on the shell, the second isolation sheet is arranged in the accommodating cavity and covers a side of the second sealing cover adjacent to the battery cell, the second busbar assembly is connected to the second isolation sheet, the second isolation sheet is provided with a second isolation through hole, and the second isolation through hole is connected to the second sealing through hole to form the second mounting through hole.

[0013] In one embodiment, the bottom of the sealing pin is located above the first isolation sheet, and the top of the sealing pin is parallel to an end surface of the first pole.

[0014] In one embodiment, the cylindrical battery further includes an explosion-proof valve, the first battery cover plate further defines a third mounting hole, the third mounting hole is connected to the accommodating cavity, and the explosion-proof valve is mounted in the third mounting hole.

[0015] In one embodiment, the first pole is further provided with a sealing groove, the sealing groove is connected to the injection through hole, the sealing pin is convexly provided with a sealing block, and the sealing block is adapted to be embedded in the sealing groove.

[0016] In one embodiment, the first pole and the second pole are both columnar structures.

[0017] In one embodiment, the radius of the injection hole is smaller than the radius of the winding needle center hole.

[0018] Compared with the prior art, the utility model has at least the following advantages:

[0019] In the cylindrical battery, the injection through hole is located at the center of the first pole, so that the electrolyte is injected from the center of the cylindrical battery, and the electrolyte diffuses from the center of the accommodating cavity, thereby accelerating the injection speed;

[0020] During the opening formation process of the cylindrical battery, gas is generated, which makes it easy for the electrolyte to flow out from the injection port. Since the injection through hole is opened in the center of the first pole, the injection port is located at one end surface of the first pole, and the height of the injection port is increased, making it more difficult for the electrolyte in the accommodating cavity to seep out, thereby reducing electrolyte seepage, increasing the electrolyte injection amount, and avoiding the problem of electrolyte splashing during sealing pin welding.

[0021] The liquid passage is opened at the center of the first busbar assembly, so that welding between one end surface of the first busbar assembly and the connection point of the battery core is convenient and the welding points are uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is a schematic structural diagram of a cylindrical battery according to an embodiment;

[0024] Figure 2 for Figure 1 A schematic diagram of the partial structure of a cylindrical battery shown;

[0025] Figure 3 for Figure 1 Another structural schematic diagram of a cylindrical battery shown;

[0026] Figure 4 for Figure 1 Another structural schematic diagram of a cylindrical battery is shown. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] In order to better understand the technical solutions and beneficial effects of the present application, the present application is further described in detail below in conjunction with specific embodiments:

[0031] like Figure 1 and Figure 2 As shown, a cylindrical battery 10 of an embodiment includes a shell assembly 100, a pole assembly 200, a bus assembly 300 and a battery cell 400. The shell assembly 100 includes a shell 110, a first battery cover 120 and a second battery cover 130. The first battery cover 120 is covered at one end of the shell 110, and the second battery cover 130 is covered at the other end of the shell 110. A accommodating cavity 1101 is opened in the shell 110, and the battery cell 400 is installed in the accommodating cavity 1101.

[0032] like Figure 1 and Figure 2 As shown, further, the pole assembly 200 includes a first pole 210, a second pole 220 and a sealing nail 230, the first battery cover 120 is provided with a first mounting through hole 1201, the second battery cover 130 is provided with a second mounting through hole 1301, the first mounting through hole 1201 and the second mounting through hole 1301 are respectively connected to the accommodating cavity 1101, the first pole 210 is penetrated through the first mounting through hole 1201, the first pole 210 is welded on the first battery cover 120, the center of the first pole 210 is provided with an injection through hole 2101, the injection through hole 2101 is used to inject electrolyte, the sealing nail 230 is installed in the injection through hole 2101, the sealing nail 230 can be fixed on the injection through hole 2101 by welding, the second pole 220 is penetrated through the second mounting through hole 1301, The second pole 220 is welded on the second battery cover 130; the busbar assembly 300 includes a first busbar assembly 310 and a second busbar assembly 320, the center of the first busbar assembly 310 is provided with a liquid passage 3101, the liquid passage 3101 is connected to the accommodating cavity 1101, the battery cell 400 is wound by a winding needle, the battery cell 400 is formed with a winding needle center hole 401, the two ends of the liquid passage 3101 are respectively connected to the winding needle center hole 401 and the liquid injection through hole 2101, one end of the first busbar assembly 310 is connected to the first pole 210 and the first battery cover 120, one end face of the first busbar assembly 310 is connected to one end of the battery cell 400, and the other end of the second busbar assembly 320 is connected to the second pole 220 and the second battery cover 130.

[0033] In this embodiment, the battery cell 400 is first wound, one end of the first busbar assembly 310 is laser welded to one end of the battery cell 400, and the other end of the first busbar assembly 310 is welded to the first pole 210, and then the battery cell 400 is installed in the accommodating cavity 1101, one end of the second busbar assembly 320 is welded to the other end of the battery cell 400, and the other end of the second busbar assembly 320 is welded to the second pole 220, the first pole 210 is welded to the first mounting hole, the first battery cover 120 and the shell 110 are sealed and welded, after the second pole 220 is welded to the second mounting hole, the second battery cover 130 and the shell 110 are sealed and welded, and then the electrolyte is injected from the injection hole 2101 in the center of the first pole 210, and the process is sequentially subjected to standing, opening formation, secondary injection of electrolyte, secondary standing, and finally the sealing nail 230 is welded.

[0034] In the cylindrical battery 10 mentioned above, the injection through hole 2101 is located at the center of the first pole 210, so that the electrolyte is injected from the center of the cylindrical battery 10, and the electrolyte diffuses from the center of the accommodating cavity 1101, thereby accelerating the injection speed; the cylindrical battery 10 will produce gas during the opening formation process, so that the electrolyte is easy to flow out from the injection port. Since the injection through hole 2101 is opened in the center of the first pole 210, the injection port is located at one end face of the first pole 210, and the height of the injection port is increased, so that the electrolyte in the accommodating cavity 1101 is more difficult to seep out, thereby reducing the electrolyte seepage, increasing the injection amount of the electrolyte, and avoiding the problem of electrolyte splashing during sealing pin welding; the liquid passage 3101 is opened in the center of the first busbar assembly 310, so that the welding points at the connection between one end face of the first busbar assembly 310 and the battery cell 400 are uniform and convenient to weld.

[0035] like Figure 1 As shown, in one embodiment, the first pole 210 is a positive pole, the first busbar assembly 310 is a positive busbar assembly, the second pole 220 is a negative pole, the second busbar assembly 320 is a negative busbar assembly, and the sealing nail 230 is installed on the positive pole. In this embodiment, the electrolyte can be injected into the electrolyte through the injection through hole 2101 of the positive pole.

[0036] like Figure 1 As shown, in one embodiment, the first pole 210 is a negative pole, the second busbar assembly 320 is a negative busbar assembly, the second pole 220 is a positive pole, the second busbar assembly 320 is a positive busbar assembly, and the sealing nail 230 is installed on the negative pole. In this embodiment, the electrolyte can be injected into the electrolyte through the injection through hole 2101 of the negative pole.

[0037] like Figure 1 and Figure 2As shown, in one embodiment, the first busbar assembly 310 includes a first fixing belt 311, a first connecting belt 312 and a first connecting plate 313, the first fixing belt 311 is provided with a first through hole 3102, the first connecting belt 312 is provided with a second through hole 3103, the first connecting plate 313 is provided with a third through hole 3104, the third through hole is connected to one end of the battery cell 400, the first fixing belt 311 is connected to the first battery cover plate 120 and to the first pole 210, the first through hole 3102 is connected to the liquid injection through hole 2101, the two ends of the first connecting belt 312 are respectively connected to the first fixing belt 311 and the first connecting plate 313, a side surface of the first connecting plate 313 is also connected to the other end of the battery cell 400, the third through hole 3104 is connected to the center hole 401 of the winding needle, the first through hole 3102, the second through hole 3103 and the third through hole 3104 together form a liquid passage 3101. In this embodiment, the first via hole 3102, the second via hole 3103, the third via hole 3104, and the winding needle center hole 401 are all located at the center of the cylindrical battery 10. When the electrolyte is injected from the injection through hole 2101, the electrolyte passes through the first via hole 3102, the second via hole 3103 and the third via hole 3104 in sequence, and finally enters the winding needle center hole 401, so that the electrolyte diffuses from the center to the surroundings, thereby making the electrolyte diffuse evenly and quickly; in the traditional battery structure, since the injection port is located at the edge of the battery cover, the third via hole 3104 is arranged at the edge of the first connecting plate 313, which causes uneven welding points at the connection between the first connecting plate 313 and the battery cell. The third via hole 3104 of the cylindrical battery 10 is arranged at the center of the first connecting plate 313, so that the welding points between the first connecting plate 313 and the battery cell 400 are evenly distributed.

[0038] like Figure 1 and Figure 2 As shown, in one embodiment, the second busbar assembly 320 includes a second fixing belt 321, a second connecting belt 322 and a second connecting plate 323, the second fixing belt 321 is connected to the second battery cover 130 and connected to the second pole 220, the two ends of the second connecting belt 322 are respectively connected to the second connecting plate 323, and one side of the second connecting plate 323 is connected to the other end of the battery cell 400. In this embodiment, one side of the second connecting plate 323 is connected to the battery cell 400 by laser welding, and the second connecting plate 323 is connected to the second connecting belt 322, the second fixing belt 321 and the second pole 220 in sequence, so that electrons are transmitted between the battery cell 400, the second busbar assembly 320 and the second pole 220.

[0039] like Figure 1 and Figure 2As shown, in one embodiment, the first battery cover plate 120 includes a first sealing cover 121 and a first isolation sheet 122, the first sealing cover 121 is provided with a first sealing through hole 1202, the first sealing cover 121 is covered on the housing 110, the first isolation sheet 122 is arranged in the accommodating cavity 1101 and covers the side of the first sealing cover 121 adjacent to the battery cell 400, the first busbar assembly 310 is connected to the first isolation sheet 122, the first isolation sheet 122 is provided with a first isolation through hole 1203, the first isolation through hole 1203 is connected to the first sealing through hole 1202 to form a first installation The second battery cover plate 130 includes a second sealing cover 131 and a second isolation sheet 132. The second sealing cover 131 is provided with a second sealing through hole 1302. The second sealing cover 131 is covered on the housing 110. The second isolation sheet 132 is arranged in the accommodating cavity 1101 and covers the side of the second sealing cover 131 adjacent to the battery cell 400. The second busbar assembly 320 is connected to the second isolation sheet 132. The second isolation sheet 132 is provided with a second isolation through hole 1303. The second isolation through hole 1303 is connected to the second sealing through hole 1302 to form a second mounting through hole 1301. In this embodiment, the first isolation sheet 122 covers the first sealing cover 121, preventing the electrolyte from contacting and corroding the first sealing cover 121, thereby increasing the service life of the first sealing cover 121. The second isolation sheet 132 covers the second sealing cover 131, preventing the electrolyte from contacting and corroding the second sealing cover 131, thereby increasing the service life of the second sealing cover 131.

[0040] like Figure 1 As shown, in one embodiment, the bottom of the sealing pin 230 is located above the first isolation sheet 122, and the top of the sealing pin 230 is parallel to one end surface of the first pole 210. In this embodiment, the sealing pin 230 is located above the isolation sheet, so that the liquid level of the injected electrolyte is increased, thereby increasing the injection amount of the injected electrolyte, the top of the sealing pin 230 is parallel to the first pole 210, and the welding point is a plane, which facilitates the welding of the sealing pin 230 and the first pole 210.

[0041] like Figure 2 As shown, in one embodiment, the cylindrical battery 10 further includes an explosion-proof valve 500, the first battery cover 120 further defines a third mounting hole 1204, the third mounting hole 1204 is connected to the accommodating cavity 1101, and the explosion-proof valve 500 is installed in the third mounting hole 1204. In this embodiment, the explosion-proof valve 500 is connected to the accommodating cavity 1101, and when the pressure of the accommodating cavity 1101 in the cylindrical battery 10 increases, the explosion-proof valve 500 in the explosion-proof valve 500 is broken, so that the explosion-proof valve 500 is connected to the outside, thereby allowing the accommodating cavity 1101 to release pressure quickly.

[0042] like Figure 1As shown, in one embodiment, the first pole 210 is further provided with a sealing groove 2102, the sealing groove 2102 is connected to the injection through hole 2101, and the sealing nail 230 is convexly provided with a sealing block 210, and the sealing block 210 is adapted to be embedded in the sealing groove 2102. In this embodiment, the sealing nail 230 is adapted to be embedded in the sealing groove 2102, so that the sealing block 210 blocks the outflow of the injection through hole 2101, thereby improving the sealing performance of the sealing nail 230 installed in the injection through hole 2101.

[0043] like Figure 1 , Figure 3 and Figure 4 As shown, in one embodiment, the first pole 210 and the second pole 220 are both columnar structures. In this embodiment, the first pole 210 and the second pole 220 can be processed into columnar structures of different shapes, so that the first pole 210 and the second pole 220 can be adapted to cylindrical batteries 10 with different shell 110 shapes.

[0044] like Figure 1 As shown, in one embodiment, the radius of the injection hole 2101 is smaller than the radius of the winding needle center hole 401. In this embodiment, the electrolyte enters the winding needle center hole 401 through the injection hole 2101 and the liquid passage 3101 in sequence, and the electrolyte accurately falls on the winding needle center hole 401, and spreads from the center position of the cylindrical battery 10 to the surroundings.

[0045] Compared with the prior art, the utility model has at least the following advantages:

[0046] 1. In the cylindrical battery 10 described above, the injection through hole 2101 is located at the center of the first pole 210, so that the electrolyte is injected from the center of the cylindrical battery 10, and the electrolyte diffuses from the center of the accommodating cavity 1101, thereby accelerating the injection speed;

[0047] 2. During the opening formation process of the cylindrical battery 10, gas is generated, which makes it easy for the electrolyte to flow out from the injection port. Since the injection through hole 2101 is opened at the center of the first pole 210, the injection port is located at one end surface of the first pole 210, and the height of the injection port is increased, so that the electrolyte in the accommodating cavity 1101 is more difficult to seep out, thereby reducing electrolyte seepage, increasing the injection amount of the electrolyte, and avoiding the problem of electrolyte splashing during sealing nail welding;

[0048] 3. The liquid passage 3101 is opened at the center of the first busbar assembly 310, so that the welding at the connection between one end surface of the first busbar assembly 310 and the battery cell 400 is convenient and the welding points are uniform.

[0049] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A cylindrical battery, comprising a shell assembly, a pole assembly, a busbar assembly and a battery cell, wherein the shell assembly comprises a shell, a first battery cover and a second battery cover, wherein the first battery cover is disposed at one end of the shell, and the second battery cover is disposed at the other end of the shell, wherein a receiving cavity is provided in the shell, and the battery cell is installed in the receiving cavity, wherein: The pole assembly includes a first pole, a second pole and a sealing nail, the first battery cover is provided with a first mounting through hole, the second battery cover is provided with a second mounting through hole, the first mounting through hole and the second mounting through hole are respectively connected to the accommodating cavity, the first pole is penetrated through the first mounting through hole, a liquid injection through hole is provided at the center of the first pole, the sealing nail is installed in the liquid injection through hole, and the second pole is penetrated through the second mounting through hole; The busbar assembly includes a first busbar assembly and a second busbar assembly. A liquid passage is opened in the center of the first busbar assembly, and the liquid passage is connected to the accommodating cavity. A winding needle center hole is formed in the battery cell, and the two ends of the liquid passage are respectively connected to the winding needle center hole and the liquid injection through hole. One end of the first busbar assembly is connected to the first pole and the first battery cover, the other end of the first busbar assembly is connected to one end of the battery cell, and the other end of the second busbar assembly is connected to the second pole and the second battery cover.

2. The cylindrical battery according to claim 1, characterized in that: The first busbar assembly includes a first fixing belt, a first connecting belt and a first connecting plate, the first fixing belt is provided with a first through hole, the first connecting belt is provided with a second through hole, the first connecting plate is provided with a third through hole, one side of the first connecting plate is connected to one end of the battery cell, the first fixing belt is connected to the first battery cover plate and to the first pole, the first through hole is connected to the liquid injection through hole, the two ends of the first connecting belt are respectively connected to the first fixing belt and the first connecting plate, the first connecting plate is also connected to the other end of the battery cell, the third through hole is connected to the center hole of the winding needle, and the first through hole, the second through hole and the third through hole together form the liquid passage.

3. The cylindrical battery according to claim 2, characterized in that: The second busbar assembly includes a second fixing belt, a second connecting belt and a second connecting plate. The second fixing belt is connected to the second battery cover and to the second pole. The two ends of the second connecting belt are respectively connected to the second connecting plate. One side of the second connecting plate is connected to the other end of the battery cell.

4. The cylindrical battery according to claim 1, characterized in that: The first battery cover plate includes a first sealing cover and a first isolation sheet, the first sealing cover is provided with a first sealing through hole, the first sealing cover is covered on the shell, the first isolation sheet is arranged in the accommodating cavity and covers a side of the first sealing cover adjacent to the battery cell, the first busbar assembly is connected to the first isolation sheet, the first isolation sheet is provided with a first isolation through hole, the first isolation through hole is connected to the first sealing through hole to form the first mounting through hole; and\or, The second battery cover plate includes a second sealing cover and a second isolation sheet, the second sealing cover is provided with a second sealing through hole, the second sealing cover is covered on the shell, the second isolation sheet is arranged in the accommodating cavity and covers a side of the second sealing cover adjacent to the battery cell, the second busbar assembly is connected to the second isolation sheet, the second isolation sheet is provided with a second isolation through hole, and the second isolation through hole is connected to the second sealing through hole to form the second mounting through hole.

5. The cylindrical battery according to claim 4, characterized in that: The bottom of the sealing nail is located above the first isolation sheet, and the top of the sealing nail is parallel to an end surface of the first pole.

6. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery further includes an explosion-proof valve. The first battery cover plate further includes a third mounting hole, the third mounting hole is connected to the accommodating cavity, and the explosion-proof valve is mounted in the third mounting hole.

7. The cylindrical battery according to claim 1, characterized in that: The first pole is also provided with a sealing groove, which is communicated with the injection through hole. The sealing pin is convexly provided with a sealing block, which is adapted to be embedded in the sealing groove.

8. The cylindrical battery according to claim 1, characterized in that: The first pole and the second pole are both columnar structures.

9. The cylindrical battery according to claim 1, characterized in that: The radius of the liquid injection through hole is smaller than the radius of the winding needle center hole.

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