Cylindrical battery

Abstract

This utility model discloses a cylindrical battery, including a cylindrical body, a first end cap, a second end cap, a first sealing element, and a second sealing element. The inner circumferential wall of the cylindrical body is provided with a first annular groove and a second annular groove. The first end cap is disposed at one end of the cylindrical body and has a first sealing protrusion, at least a portion of which is accommodated in the first annular groove. The second end cap is disposed at the other end of the cylindrical body and has a second sealing protrusion, at least a portion of which is accommodated in the second annular groove. The cylindrical body, the first end cap, and the second end cap together form a receiving cavity. The first sealing element is sandwiched between the cylindrical body and the first sealing protrusion, and the second sealing element is sandwiched between the cylindrical body and the second sealing protrusion. The battery cell is installed in the receiving cavity. When the cylindrical battery is overcharged, causing an abnormal increase in the pressure inside the receiving cavity, it can effectively resist the impact of the internal pressure on the first end cap and the second end cap, thereby improving the service life of the cylindrical battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cylindrical battery. Background Technology

[0002] Existing cylindrical batteries include a casing, a cell, a first end cap, and a second end cap. The first end cap is located at one end of the casing, and the second end cap is located at the other end of the casing. The casing, the first end cap, and the second end cap together form a cavity. When the cylindrical battery is overcharged, the pressure inside the cavity becomes too high, which leads to a decrease in the sealing performance of the first or second end cap, making it easy for the electrolyte to leak and reducing the safety of the cylindrical battery. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a cylindrical battery that can improve safety in use.

[0004] A cylindrical battery according to an embodiment of the present invention includes: The cylindrical body has a first annular groove and a second annular groove on its inner peripheral wall, and the first annular groove and the second annular groove are spaced apart along the axial direction of the cylindrical body. A first end cap is provided on one end of the cylinder. The first end cap has a first sealing protrusion, and at least a portion of the first sealing protrusion is accommodated in the first annular groove. The second end cap is provided on the other end of the cylinder. The second end cap has a second sealing protrusion. At least a portion of the second sealing protrusion is accommodated in the second annular groove. The cylinder, the first end cap, and the second end cap together form a receiving cavity. A first sealing element is sandwiched between the cylinder and the first sealing protrusion to seal the first end cap and the cylinder; The second sealing element is sandwiched between the cylinder and the second sealing protrusion to seal the second end cap and the cylinder; A battery cell is installed in the receiving cavity, with the positive terminal of the battery cell connected to the first end cap and the negative terminal of the battery cell connected to the second end cap.

[0005] The cylindrical battery according to the embodiments of this utility model has at least the following beneficial effects: The first end cap and the second end cap respectively seal both ends of the cylinder. Under the synergistic action of the first sealing element, the first annular groove, and the first sealing protrusion, on the one hand, the first end cap and the cylinder can be sealed, and on the other hand, the axial movement of the first end cap along the cylinder can be restricted. Similarly, under the synergistic action of the second sealing element, the second annular groove, and the second sealing protrusion, on the one hand, the second end cap and the cylinder can be sealed, and on the other hand, the axial movement of the second end cap along the cylinder can be restricted. When the cylindrical battery is overcharged, causing the pressure inside the cavity to rise abnormally, it can effectively resist the impact of the internal pressure on the first end cap and the second end cap to prevent electrolyte leakage, thereby improving the service life of the cylindrical battery.

[0006] According to some embodiments of the present invention, the first sealing member includes a first sealing ring and a first positioning ring connected to one end of the first sealing ring. The first positioning ring is provided with a first positioning groove. The first sealing ring is accommodated in the first annular groove and sandwiched between the first sealing protrusion and the cylinder. The inner peripheral wall of the cylinder is provided with a first positioning protrusion. The first positioning protrusion is accommodated in the first positioning groove and abuts against the side wall of the first positioning groove.

[0007] According to some embodiments of the present invention, the first sealing element further includes a second sealing ring, the second sealing ring being connected to the end of the first positioning ring away from the first sealing ring, and a third sealing protrusion being formed at one end of the cylinder, the second sealing ring being sandwiched between the third sealing protrusion and the side of the first end cap away from the second end cap.

[0008] According to some embodiments of the present invention, the first sealing ring, the first positioning ring, and the second sealing ring are an integral structure.

[0009] According to some embodiments of the present invention, the inner peripheral wall of the cylinder is provided with a second positioning protrusion, the first annular groove is located between the first positioning protrusion and the second positioning protrusion, the first end cap is provided with a second positioning groove, and the second positioning protrusion is accommodated in the second positioning groove and abuts against the side wall of the second positioning groove.

[0010] According to some embodiments of the present invention, the first sealing element and / or the second sealing element are made of rubber.

[0011] According to some embodiments of the present invention, the outer peripheral wall of the cylinder is provided with a third annular groove, a fourth annular groove, a fifth annular groove and a sixth annular groove. The third annular groove, the fourth annular groove, the fifth annular groove and the sixth annular groove are arranged sequentially at intervals along the axial direction of the cylinder. Along the axial direction of the cylinder, the first annular groove is located between the third annular groove and the fourth annular groove, and the second annular groove is located between the fifth annular groove and the sixth annular groove.

[0012] According to some embodiments of the present invention, the first end cap is provided with a first internal thread portion, and the second end cap is provided with a second internal thread portion.

[0013] According to some embodiments of the present invention, the first end cap is provided with a first through hole communicating with the receiving cavity, and a first pressure relief valve is installed at the first through hole, the first pressure relief valve having a first pressure relief hole.

[0014] According to some embodiments of the present invention, the first pressure relief valve includes a pressure relief cover and a pressure relief component. The first pressure relief hole is disposed on the pressure relief cover, and the pressure relief cover is disposed on the first through hole. The pressure relief cover is provided with a first receiving groove, and the pressure relief component is disposed in the first receiving groove. The pressure relief component is elastic so that the pressure relief component can open or close the first through hole.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the cylindrical battery structure according to an embodiment of the present invention; Figure 2 This is an exploded view of a cylindrical battery according to an embodiment of the present invention; Figure 3 This is a top view of a cylindrical battery according to an embodiment of the present invention; Figure 4 for Figure 3 Sectional view of line AA in the middle; Figure 5 This is a schematic diagram of the structure of the first or second sealing element in an embodiment of the present utility model; Figure 6 This is a schematic diagram of the structure of the cylinder according to an embodiment of the present utility model; Figure 7 This is a schematic diagram of the structure of the first end cap or the second end cap according to an embodiment of the present utility model.

[0017] Figure label: Cylinder 100, First annular groove 101, Second annular groove 102, Third annular groove 103, Fourth annular groove 104, Fifth annular groove 105, Sixth annular groove 106, First positioning protrusion 110, Second positioning protrusion 120, Third sealing protrusion 130, Third positioning protrusion 140, Fourth positioning protrusion 150, Fourth sealing protrusion 160, First end cap 200, First sealing protrusion 210, Second positioning groove 220, First through hole 230, First internal thread 240, Second end cap 300, Second sealing protrusion 310, Fourth positioning groove 320, Second through hole 330, Second internal thread 340, First sealing element 400, First sealing ring 410, First positioning ring 420, First positioning groove 421, Second sealing ring 430, Third positioning groove 431, Second sealing element 500, Battery cell 600, First pressure relief valve 710, Second pressure relief valve 720. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0021] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0022] In related technologies, a cylindrical battery includes a cylindrical body, a battery cell, a first end cap, and a second end cap. The first end cap is located at one end of the cylindrical body, and the second end cap is located at the other end of the cylindrical body. The cylindrical body, the first end cap, and the second end cap together form a cavity. When the cylindrical battery is overcharged, the pressure inside the cavity becomes too high, which leads to a decrease in the sealing performance of the first end cap or the second end cap, making it easy for the electrolyte to leak and reducing the safety of the cylindrical battery.

[0023] Reference Figures 1 to 7 According to an embodiment of the present invention, a cylindrical battery includes a cylindrical body 100, a first end cap 200, a second end cap 300, a first sealing element 400, and a second sealing element 500. The inner circumferential wall of the cylindrical body 100 is provided with a first annular groove 101 and a second annular groove 102, which extend circumferentially along the cylindrical body 100 and are spaced apart axially along the cylindrical body 100. The first end cap 200 is disposed on one end of the cylindrical body 100 and has a first sealing protrusion 210, at least a portion of which is accommodated within the first annular groove 101. The second end cap 300 is disposed on the other end of the cylindrical body 100 and has a second sealing protrusion 310. At least a portion of the 10 is housed within the second annular groove 102. The cylindrical body 100, the first end cap 200, and the second end cap 300 enclose a receiving cavity. A first sealing member 400 is sandwiched between the cylindrical body 100 and the first sealing protrusion 210 to seal the first end cap 200 and the cylindrical body 100. A second sealing member 500 is sandwiched between the cylindrical body 100 and the second sealing protrusion 310 to seal the second end cap 300 and the cylindrical body 100. The battery cell 600 is installed in the receiving cavity. The positive terminal of the battery cell 600 is connected to the first end cap 200, and the negative terminal of the battery cell 600 is connected to the second end cap 300. In this way, when the cylindrical battery is overcharged, causing an abnormal increase in the pressure inside the receiving cavity, it can effectively resist the impact of the internal pressure on the first end cap 200 and the second end cap 300 to prevent electrolyte leakage, thereby improving the service life of the cylindrical battery.

[0024] For example, the first end cap 200 and the second end cap 300 respectively seal both ends of the cylindrical body 100. Under the synergistic action of the first sealing element 400, the first annular groove 101 and the first sealing protrusion 210, on the one hand, the first end cap 200 and the cylindrical body 100 can be sealed, and on the other hand, the first end cap 200 can be restricted from moving axially along the cylindrical body 100. Similarly, under the synergistic action of the second sealing element 500, the second annular groove 102 and the second sealing protrusion 310, on the one hand, the second end cap 300 and the cylindrical body 100 can be sealed, and on the other hand, the second end cap 300 can be restricted from moving axially along the cylindrical body 100. When the cylindrical battery is overcharged, causing the pressure inside the cavity to rise abnormally, it can effectively resist the impact of the internal pressure on the first end cap 200 and the second end cap 300 to prevent electrolyte leakage, thereby improving the service life of the cylindrical battery.

[0025] In some embodiments of this utility model, the first sealing member 400 includes a first sealing ring 410 and a first positioning ring 420 connected to one end of the first sealing ring 410. The first positioning ring 420 is provided with a first positioning groove 421. The first sealing ring 410 is accommodated in the first annular groove 101 and sandwiched between the first sealing protrusion 210 and the cylinder 100. The inner peripheral wall of the cylinder 100 is provided with a first positioning protrusion 110. The first positioning protrusion 110 is accommodated in the first positioning groove 421 and abuts against the side wall of the first positioning groove 421. By providing the first positioning ring 420 with the first positioning groove 421, the first positioning groove 421 cooperates with the first positioning protrusion 110 on the inner wall of the cylinder 100, providing precise axial and radial positioning for the first sealing member 400. This ensures that the first sealing ring 410 can be stably and centeredly pressed into the first annular groove 101, preventing the seal from shifting or twisting during battery assembly or when subjected to internal pressure impacts, thereby improving the sealing effect of the cylindrical battery.

[0026] In some embodiments of this utility model, the first sealing member 400 further includes a second sealing ring 430. The second sealing ring 430 is connected to the end of the first positioning ring 420 away from the first sealing ring 410. A third sealing protrusion 130 is formed at one end of the cylinder 100. The second sealing ring 430 is sandwiched between the third sealing protrusion 130 and the side of the first end cap 200 away from the second end cap 300. Another sealing barrier is formed between the second sealing ring 430 and the outer side of the first end cap 200. This constitutes a multi-level sealing structure, which can more effectively prevent electrolyte from leaking outward along the assembly gap between the first end cap 200 and the cylinder 100, and the sealing protection is more comprehensive.

[0027] In some embodiments of this utility model, the first sealing ring 410, the first positioning ring 420, and the second sealing ring 430 are integral structures. The integrally formed structure has better structural integrity and mechanical strength. When subjected to internal pressure, the deformation is uniform, the sealing performance is more stable and reliable, and the management and assembly process of the components are also simplified.

[0028] For example, the first sealing ring 410, the first positioning ring 420, and the second sealing ring 430 can be integrally molded by injection molding. When subjected to internal pressure, the deformation is uniform, the sealing performance is more stable and reliable, and the management and assembly process of the components is also simplified.

[0029] As another implementation, the first sealing ring 410, the first positioning ring 420 and the second sealing ring 430 can also be connected by welding. The welding method includes, but is not limited to, resistance welding, laser welding or ultrasonic welding, and is not limited here.

[0030] It should be noted that in some embodiments of this utility model, the second sealing element 500 includes a third sealing ring and a second positioning ring connected to one end of the third sealing ring. The second positioning ring is provided with a third positioning groove 431. The third sealing ring is accommodated within the first annular groove 101 and sandwiched between the second sealing protrusion 310 and the cylindrical body 100. The inner peripheral wall of the cylindrical body 100 is provided with a third positioning protrusion 140, which is accommodated within the third positioning groove 431 and abuts against the side wall of the third positioning groove 431. By providing a second positioning ring with a third positioning groove 431, the third positioning groove 431 cooperates with the third positioning protrusion 140 on the inner wall of the cylindrical body 100, providing precise axial and radial positioning for the second sealing element 500. This ensures that the third sealing ring can be stably and centrally pressed within the second annular groove 102, preventing displacement or twisting of the sealing element during battery assembly or when subjected to internal pressure impacts, thereby improving the sealing effect of the cylindrical battery.

[0031] In some embodiments of this utility model, the second sealing member 500 further includes a fourth sealing ring. The fourth sealing ring is connected to the end of the second positioning ring away from the third sealing ring. A fourth sealing protrusion 160 is formed at one end of the cylinder 100. The fourth sealing ring is sandwiched between the fourth sealing protrusion 160 and the side of the second end cap 300 away from the first end cap 200. Another sealing barrier is formed between the fourth sealing ring and the outer side of the second end cap 300. This constitutes a multi-level sealing structure, which can more effectively prevent electrolyte from leaking outward along the assembly gap between the second end cap 300 and the cylinder 100, and the sealing protection is more comprehensive.

[0032] In some embodiments of this utility model, the inner peripheral wall of the cylinder 100 is provided with a second positioning protrusion 120, the first annular groove 101 is located between the first positioning protrusion 110 and the second positioning protrusion 120, and the first end cap 200 is provided with a second positioning groove 220. The second positioning protrusion 120 is accommodated in the second positioning groove 220 and abuts against the side wall of the second positioning groove 220, thereby achieving precise positioning and limiting of the first end cap 200 itself. This can prevent the first end cap 200 from axially shifting or radially shaking under high pressure, and ensure that the first sealing protrusion 210 on the first end cap 200 always maintains the best compression and sealing state with the first sealing ring 410, thereby improving the pressure resistance of the first end cap 200.

[0033] In some embodiments of this utility model, the inner peripheral wall of the cylinder 100 is provided with a fourth positioning protrusion 150, the second annular groove 102 is located between the third positioning protrusion 140 and the fourth positioning protrusion 150, the second end cover 300 is provided with a fourth positioning groove 320, the second positioning protrusion 120 is accommodated in the fourth positioning groove 320 and abuts against the side wall of the fourth positioning groove 320, thereby achieving precise positioning and limiting of the second end cover 300 itself, preventing the second end cover 300 from axially shifting or radially shaking under high pressure, ensuring that the second sealing protrusion 310 on the second end cover 300 always maintains the best compression and sealing state with the third sealing ring, and improving the pressure resistance of the second end cover 300.

[0034] In some embodiments of this invention, the first sealing element 400 and / or the second sealing element 500 are made of rubber, utilizing the excellent elasticity, resilience, and deformation capacity of rubber. When the internal pressure increases, the rubber sealing element can undergo adaptive deformation to better fill the microscopic gap between the sealing protrusion and the annular groove, maintaining or even enhancing the sealing contact pressure, thereby effectively adapting to changes in internal pressure, achieving dynamic sealing, and preventing leakage.

[0035] In some embodiments of this utility model, the outer peripheral wall of the cylindrical body 100 is provided with a third annular groove 103, a fourth annular groove 104, a fifth annular groove 105, and a sixth annular groove 106. The third annular groove 103, the fourth annular groove 104, the fifth annular groove 105, and the sixth annular groove 106 are arranged sequentially at intervals along the axial direction of the cylindrical body 100. Along the axial direction of the cylindrical body 100, the first annular groove 101 is located between the third annular groove 103 and the fourth annular groove 104, and the second annular groove 102 is located between the fifth annular groove 105 and the sixth annular groove 106. This significantly improves the overall structural strength and rigidity of the cylindrical body 100. The cylindrical body 100 is less prone to bulging or deformation when subjected to high internal pressure, which can improve the sealing reliability of the cylindrical battery.

[0036] For example, by rolling the third annular groove 103 and the fourth annular groove 104, the inner peripheral wall of the cylinder 100 is formed with the first annular groove 101. Similarly, by rolling the fifth annular groove 105 and the sixth annular groove 106, the inner peripheral wall of the cylinder 100 is formed with the second annular groove 102. On the one hand, it is convenient to process and manufacture the first annular groove 101 and the second annular groove 102. On the other hand, it significantly improves the overall structural strength and rigidity of the cylinder 100. The cylinder 100 is less likely to bulge or deform when subjected to high internal pressure, which can improve the sealing reliability of the cylindrical battery.

[0037] In some embodiments of this utility model, the first end cap 200 is provided with a first internal thread portion 240, and the second end cap 300 is provided with a second internal thread portion 340, which facilitates the splicing of multiple cylindrical batteries.

[0038] For example, in a battery pack, two adjacent cylindrical batteries are spliced ​​together by a connector. The two ends of the connector are respectively provided with a first external thread and a second external thread. The first internal thread 240 matches the first external thread, and the second internal thread 340 matches the second external thread, which facilitates the splicing of multiple cylindrical batteries.

[0039] In some embodiments of this utility model, the first end cap 200 is provided with a first through hole 230 communicating with the receiving cavity. A first pressure relief valve 710 is installed at the first through hole 230. The first pressure relief valve 710 has a first pressure relief hole. When the pressure inside the receiving cavity exceeds a preset safety threshold, the pressure relief valve will be activated first, and the high-pressure gas will be discharged in an orderly manner through the pressure relief hole, thereby actively and quickly reducing the internal pressure. This eliminates the pressure source that leads to sealing failure from the source and greatly improves the safety performance of the battery.

[0040] In some embodiments of this utility model, the first pressure relief valve 710 includes a pressure relief cover and a pressure relief component. A first pressure relief hole is provided on the pressure relief cover, and the pressure relief cover is provided on the first through hole 230. The pressure relief cover is provided with a first receiving groove, and the pressure relief component is provided in the first receiving groove. The pressure relief component is elastic so that it can open or close the first through hole 230. The opening and closing of the first through hole 230 is achieved by utilizing the elastic deformation of the pressure relief component. When the pressure is normal, it ensures a seal. When there is overpressure, it can respond in time to open the pressure relief action reliably. After pressure relief, the elastic component can rebound, which improves the reusability of the first pressure relief valve 710.

[0041] It should be noted that the first pressure relief valve 710 can also be a resilient valve plate, which is not limited here.

[0042] In some embodiments of this utility model, the second end cap 300 is provided with a second through hole 330 communicating with the receiving cavity. A second pressure relief valve 720 is installed at the second through hole 330. The second pressure relief valve 720 has a second pressure relief hole. When the pressure inside the receiving cavity exceeds a preset safety threshold, the pressure relief valve will be activated first, and the high-pressure gas will be discharged in an orderly manner through the pressure relief hole, thereby actively and quickly reducing the internal pressure. This eliminates the pressure source that leads to seal failure from the source, greatly improving the safety performance of the battery. The specific structure of the second pressure relief valve 720 is the same as that of the first pressure relief valve 710, and is not limited here.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the invention.

Claims

1. A cylindrical battery, characterized by comprising: include: The inner peripheral wall of the cylindrical body (100) is provided with a first annular groove (101) and a second annular groove (102), and the first annular groove (101) and the second annular groove (102) are spaced apart along the axial direction of the cylindrical body (100). A first end cap (200) is provided on one end of the cylinder (100), and the first end cap (200) is provided with a first sealing protrusion (210), at least a portion of the first sealing protrusion (210) being accommodated in the first annular groove (101); The second end cap (300) is provided on the other end of the cylinder (100). The second end cap (300) is provided with a second sealing protrusion (310). At least a portion of the second sealing protrusion (310) is accommodated in the second annular groove (102). The cylinder (100), the first end cap (200) and the second end cap (300) together form a receiving cavity. The first sealing element (400) is sandwiched between the cylinder (100) and the first sealing protrusion (210) to seal the first end cap (200) and the cylinder (100). The second sealing element (500) is sandwiched between the cylinder (100) and the second sealing protrusion (310) to seal the second end cap (300) and the cylinder (100). A battery cell (600) is installed in the receiving cavity. The positive terminal of the battery cell (600) is connected to the first end cap (200), and the negative terminal of the battery cell (600) is connected to the second end cap (300).

2. The cylindrical battery according to claim 1, characterized by The first sealing element (400) includes a first sealing ring (410) and a first positioning ring (420) connected to one end of the first sealing ring (410). The first positioning ring (420) is provided with a first positioning groove (421). The first sealing ring (410) is housed in the first annular groove (101) and sandwiched between the first sealing protrusion (210) and the cylinder (100). The inner peripheral wall of the cylinder (100) is provided with a first positioning protrusion (110). The first positioning protrusion (110) is housed in the first positioning groove (421) and abuts against the side wall of the first positioning groove (421).

3. The cylindrical battery according to claim 2, characterized by The first seal (400) further includes a second sealing ring (430), which is connected to the end of the first positioning ring (420) away from the first sealing ring (410). A third sealing protrusion (130) is formed at one end of the cylinder (100), and the second sealing ring (430) is sandwiched between the third sealing protrusion (130) and the side of the first end cap (200) away from the second end cap (300).

4. The cylindrical battery according to claim 3, characterized by The first sealing ring (410), the first positioning ring (420), and the second sealing ring (430) are an integral structure.

5. The cylindrical battery according to claim 3, characterized by The inner peripheral wall of the cylinder (100) is provided with a second positioning protrusion (120), the first annular groove (101) is located between the first positioning protrusion (110) and the second positioning protrusion (120), the first end cap (200) is provided with a second positioning groove (220), the second positioning protrusion (120) is accommodated in the second positioning groove (220) and abuts against the side wall of the second positioning groove (220).

6. The cylindrical battery according to claim 1, characterized in that, The first seal (400) and / or the second seal (500) are made of rubber.

7. The cylindrical battery according to claim 1, characterized in that, The outer peripheral wall of the cylinder (100) is provided with a third annular groove (103), a fourth annular groove (104), a fifth annular groove (105), and a sixth annular groove (106). The third annular groove (103), the fourth annular groove (104), the fifth annular groove (105), and the sixth annular groove (106) are arranged sequentially at intervals along the axial direction of the cylinder (100). Along the axial direction of the cylinder (100), the first annular groove (101) is located between the third annular groove (103) and the fourth annular groove (104), and the second annular groove (102) is located between the fifth annular groove (105) and the sixth annular groove (106).

8. The cylindrical battery according to claim 1, characterized in that, The first end cap (200) is provided with a first internal thread (240), and the second end cap (300) is provided with a second internal thread (340).

9. The cylindrical battery according to claim 1, characterized in that, The first end cap (200) is provided with a first through hole (230) communicating with the receiving cavity, and a first pressure relief valve (710) is installed at the first through hole (230), and the first pressure relief valve (710) has a first pressure relief hole.

10. The cylindrical battery according to claim 9, characterized by The first pressure relief valve (710) includes a pressure relief cover and a pressure relief component. The first pressure relief hole is provided on the pressure relief cover, and the pressure relief cover is provided on the first through hole (230). The pressure relief cover is provided with a first receiving groove, and the pressure relief component is provided in the first receiving groove. The pressure relief component is elastic so that the pressure relief component can open or close the first through hole (230).

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